TL;DR – What You Need to Know
- Official DET price: $70 USD
- Comet price: $60 USD (save up to 15%)
- Delivery time: Under a minute – the world’s fastest DET voucher platform
- Payment: Secure checkout via Stripe
- Acceptance: 6,000+ universities worldwide
- Results: As little as 24 hours
- Trust: Comet is powered by Cialfo, an official Duolingo English Test partner trusted by 310,000+ students and 2,000+ partner institutions all over the globe
No forms, no waiting, no expired codes.
Table of Contents
- What does the Duolingo English Test cost in 2026?
- A brief history of DET pricing
- Why does the DET cost $70?
- What is a DET voucher code?
- DET “discount codes” vs voucher codes – what’s the difference?
- How Comet offers DET vouchers at $60 – the world’s fastest
- What is the Duolingo Global Partner Network?
- Comet’s $60 vs the official $70 – what’s different?
- Why speed matters more than a few dollars
- How does Comet compare to other DET voucher sellers?
- Is buying a discounted DET voucher safe?
- How to buy a DET voucher from Comet (step by step)
- How to redeem your DET voucher code
- What happens after you redeem?
- DET voucher vs the two-test bundle – which saves more?
- What does $10 actually save you?
- DET vouchers for institutions and counsellors
- Common mistakes when using a DET voucher
- Frequently asked questions
- Next steps
What does the Duolingo English Test cost in 2026?
The Duolingo English Test costs $70 USD for a single test attempt. Through Comet, you can get it for $60 – saving up to 15%.
This price has been in effect globally since February 11, 2025, when Duolingo increased it from $65. Duolingo also offers a two-test bundle for $110 USD ($55 per test), which requires committing to two tests upfront in a single transaction.
Here’s how the DET compares to other English proficiency tests – including the hidden costs most students forget about:
| Test | Cost per attempt | Score-sending fees | Total cost (applying to 8 universities) |
|---|---|---|---|
| DET | $70 ($60 via Comet) | Free – unlimited | $60 via Comet |
| IELTS Academic | $245–$255 | $20 per report after 5 free | $305–$315 |
| TOEFL iBT | $200–$300 | $20 per report after 4 free | $280–$380 |
| PTE Academic | $200–$250 | Free – unlimited | $200–$250 |
Even at the official $70, DET is the most affordable major English proficiency test. At $60 through Comet, the gap widens further. And unlike IELTS and TOEFL, DET lets you send scores to unlimited universities for free – no hidden per-report fees.
For students applying to 8–10 universities while managing application fees, visa costs, and transcript charges, that $10 saving through Comet is real money. It’s one more application fee covered. One less expense to stress about.
A brief history of DET pricing
The DET hasn’t always cost $70. Understanding the pricing history explains why discount vouchers have become essential for cost-conscious students.
| Period | Price | What changed |
|---|---|---|
| 2019–2020 | $49 | Launch era. DET was the disruptive newcomer. COVID-19 drove massive adoption as test centres closed globally. |
| 2021–2023 | $59 | First increase. University acceptance grew from ~1,000 to ~4,000+ programmes. Duolingo invested in AI scoring and expanded proctoring. |
| 2024 | $65 | Second increase. DET was now accepted by 5,000+ programmes and had established itself as a mainstream IELTS/TOEFL alternative. |
| 2025–present | $70 | Current price. Reflects DET’s matured market position. Now accepted by 6,000+ institutions worldwide. |
Students who discovered DET at $49 are now paying 43% more. With each price increase, demand for legitimate discount channels has grown. Official DET partners like Comet exist to fill this gap – offering verified savings backed by a direct relationship with Duolingo.
Why does the DET cost $70?
The $70 fee covers adaptive testing technology, AI-based scoring with human oversight, live video proctoring, unlimited free score reports, and a 24/7 global testing platform.
Adaptive testing technology. The DET adjusts question difficulty in real time based on your performance. Building and refining a question bank that accurately assesses English ability across a global population – from beginners to near-native speakers – is an enormous R&D investment.
AI-based scoring with human oversight. Your responses are scored by AI models trained on millions of test sessions. Human reviewers are involved in quality assurance, particularly for speaking and writing sections. This hybrid approach is what gives DET scores their credibility with universities like Yale, MIT, University College London, University of Toronto, and thousands more.
Unlimited free score reports. IELTS charges $20 per additional report. TOEFL charges $20 per report after 4 free ones. Applying to 10 universities? That’s $100–$120 extra on top of the test fee. DET sends scores to as many institutions as you want at no charge.
24/7 global platform. Take the test on any computer with a camera, microphone, and internet connection, at any time, from anywhere. That infrastructure isn’t cheap to run.
At $70, it’s already a modest fee compared to IELTS ($245+) and TOEFL ($200+). At $60 through Comet, it’s the most accessible English proficiency test in the world.
What is a DET voucher code?
A DET voucher code is an alphanumeric code that eliminates the $70 test fee at checkout on englishtest.duolingo.com. You can also think of it as a coupon code or discount code specifically for the Duolingo English Test.
Voucher codes are issued by Duolingo to authorised partners in their Global Partner Network. These partners – including Comet – distribute the codes to students at a discounted price.
How it works: You pay $60 to Comet. Comet gives you a voucher code. You enter the code at checkout on the DET website. The $70 fee drops to $0. The test you take is identical in every way to one purchased directly – same scoring, same proctoring, same certificate, same university acceptance. Your score certificate will not indicate how you paid.
Types of DET voucher codes:
- Partner vouchers (like Comet’s): Purchased from official DET partners at a discount. This is what this guide covers.
- Institutional vouchers: Some universities provide free DET vouchers to their students as part of admissions support programmes.
- Promotional vouchers: Occasionally, Duolingo runs time-limited promotions. These are rare.
DET “discount codes” vs voucher codes – what’s the difference?
If you’ve searched for “DET discount code,” “Duolingo English Test promo code,” or “DET coupon code,” you’ve probably found dozens of coupon websites listing codes that don’t actually work.
Voucher codes from official DET partners are the real thing. They’re generated by Duolingo’s system, distributed through verified partners, and work instantly at checkout. When you enter a Comet voucher code on the DET payment page, the system recognises it immediately.
“Promo codes” on coupon websites are almost always expired, fabricated, or were never real. Sites like RetailMeNot, Honey, or random coupon blogs list “Duolingo English Test discount codes” that waste your time and deliver nothing.
As Comet’s landing page puts it: no forms, no waiting, no expired codes. You pay securely via Stripe, and your verified voucher code arrives in your inbox in under a minute. That’s the difference between a real DET partner and a coupon aggregator.
How Comet offers DET vouchers at $60 – the world’s fastest
Comet is the world’s fastest DET voucher platform. Powered by Cialfo, an education technology company trusted by 310,000+ students and 2,000+ partner institutions all over the globe, Comet delivers official DET voucher codes to your inbox in under a minute.
Comet is an official Duolingo English Test partner in the Global Partner Network (GPN). This means Comet purchases voucher codes directly from Duolingo at a volume-negotiated rate and passes the savings on to students: $60 instead of $70 – save up to 15%.
What makes Comet the world’s fastest:
The entire process is automated end-to-end. There is no human in the loop between your payment and your voucher code. The moment your Stripe payment clears, your unique code is generated and emailed to you automatically – along with a step-by-step redemption guide. Average delivery time: under a minute. Most students receive their code before they close the browser tab.
Over 1,000 students have already claimed their DET voucher through Comet. No other official DET partner delivers faster.
What you get beyond the discount: Comet isn’t a thin voucher reseller. It’s powered by Cialfo – a company that serves students through their entire admissions journey. The support infrastructure, payment processing (secured by Stripe – the same system used by Amazon, Google, and Apple), and customer service are built to enterprise standards. Students across India, Singapore, Nepal, China, Australia, Canada, the UK, and beyond trust Comet for their DET vouchers.
What is the Duolingo Global Partner Network?
The Duolingo Global Partner Network (GPN) is Duolingo’s official programme for organisations authorised to distribute DET vouchers.
How it works: Duolingo vets and approves partners who meet their standards for volume, reliability, and student service. Approved partners get access to bulk voucher purchasing at negotiated rates. Comet, powered by Cialfo, holds official partner status – a reflection of Cialfo’s scale (310,000+ students, 2,000+ institutions) and established position in global education.
Why this matters to you: When you buy from an official DET partner, you’re guaranteed a genuine, Duolingo-issued voucher code generated by Duolingo’s own system. This eliminates the risk of fake, expired, or already-used codes from unauthorised resellers. If anything goes wrong – which is rare – you have a real company with a real support team to contact.
Duolingo doesn’t publish a public directory of GPN members. But you can verify legitimacy by checking whether the seller is an established education company, whether codes work instantly, and whether they have visible institutional partnerships and professional support. Comet checks every box.
Comet’s $60 vs the official $70 – what’s different?
The test experience is identical. Nothing changes except the price and the speed.
| Feature | Buy direct from Duolingo ($70) | Buy via Comet ($60) |
|---|---|---|
| Test format | Adaptive, ~1 hour | Adaptive, ~1 hour |
| Proctoring | AI + live video | AI + live video |
| Scoring | AI-scored, 10–160 scale | AI-scored, 10–160 scale |
| Subscores | Literacy, Comprehension, Conversation, Production | Literacy, Comprehension, Conversation, Production |
| Results | Within 48 hours | As little as 24 hours |
| Score reports | Unlimited, free | Unlimited, free |
| Certificate | Official DET certificate | Official DET certificate |
| Video interview | Included | Included |
| University acceptance | 6,000+ programmes | 6,000+ programmes |
| Payment | Card via Duolingo | Secure via Stripe |
| Voucher delivery | N/A | Under a minute |
| Price | $70 | $60 (save up to 15%) |
Universities have no way to tell – and no reason to care – whether you bought directly or through a partner. Your proctor doesn’t know. The AI scoring system doesn’t know. The certificate doesn’t say.
Same test. Same score. Same certificate. $60 instead of $70. Code in your inbox in under a minute.→ Get your DET voucher from Comet – the world’s fastest
Why speed matters more than a few dollars
Here’s a scenario most international students know too well: it’s 11pm, your application deadline is tomorrow, and you just realized you haven’t booked your DET yet.
With Comet, you can go from zero to test-in-progress in under 10 minutes. Buy the voucher (under a minute to receive the code), redeem it on the DET website (2 minutes), and start the test immediately (DET is available 24/7). Your results arrive in as little as 24 hours – in time for nearly any deadline.
Now imagine the same scenario with a seller that delivers codes “within 24–48 hours.” Your deadline passes. Your application is incomplete. The $4 you saved means nothing.
This is why Comet’s speed positioning isn’t a marketing tagline – it’s a genuine competitive advantage. When deadlines are real and test scores are urgent, the world’s fastest DET voucher platform is the only one that matters.
Other sellers in the market range from $56–$70. The price differences are small – a few dollars at most. But the delivery differences are enormous. Some sellers process codes manually. Some batch them overnight. Some require form submissions and follow-up emails. Comet’s process is fully automated via Stripe: pay, receive code, done. No forms, no waiting, no expired codes.
Speed isn’t a nice-to-have when your university application is on the line. It’s the whole point.
How does Comet compare to other DET voucher sellers?
Several GPN partners sell discounted DET vouchers. Prices across the market generally range from $56 to $70. Here’s why students choose Comet:
| What matters | Why it matters | Comet |
|---|---|---|
| Delivery speed | Some sellers take 24–48 hours. Deadlines don’t wait. | Under a minute – the world’s fastest |
| Trust | You’re paying upfront for a code. If something goes wrong, who do you call? | Powered by Cialfo: 310,000+ students, 2,000+ institutions |
| Payment security | Card details need to be safe. | Stripe – same infrastructure as Amazon, Google, Apple |
| Global access | Some sellers only accept local payment methods | Cards accepted worldwide, USD pricing |
| Support | If your code doesn’t work at midnight, is anyone there? | Dedicated support team + Help Center |
| Track record | How many students have used this? | 1,000+ vouchers claimed through Comet |
| Partner status | Is the seller authorised by Duolingo? | Official DET partner in Duolingo’s GPN |
The real comparison isn’t Comet vs other voucher sellers – it’s Comet vs buying directly from Duolingo at $70. A few dollars’ difference between GPN partners is negligible. The difference between a code that arrives in under a minute from a company you can trust and a code that arrives “within 24–48 hours” from a seller you’ve never heard of? That’s the gap that matters – especially the night before a deadline.
The world’s fastest DET voucher. $60. Under a minute. Powered by Cialfo.→ Get your voucher now
Is buying a discounted DET voucher safe?
Yes – if you buy from a verified DET partner. The voucher code itself is generated by Duolingo’s system. An official partner distributes codes that Duolingo has already created and validated. The safety question is about the seller, not the code.
Signs of a legitimate seller:
- They’re an established education company with a verifiable track record
- Payment goes through a recognised processor (Comet uses Stripe)
- Codes are delivered automatically – no manual processing, no “we’ll email you in 24–48 hours”
- They have a published support policy and help centre
- The voucher code works instantly on englishtest.duolingo.com
Red flags:
- Prices below $50 (even bulk GPN pricing doesn’t support this)
- Sellers on eBay, Craigslist, Facebook Marketplace, or WhatsApp groups
- Payment via cryptocurrency, wire transfer, gift cards, or personal PayPal
- No company information or contact details
- Codes that require “manual verification” before delivery
- Expired or recycled codes from coupon websites
What could go wrong with an illegitimate seller: You receive a code that’s already been used, fabricated, or flagged by Duolingo. Or you pay and never receive a code at all. With no legitimate company behind the transaction, you have no recourse.
Comet’s safety credentials: Powered by Cialfo – an established education technology company with 310,000+ students and 2,000+ partner institutions all over the globe. Payments processed through Stripe (the same infrastructure used by Amazon, Google, and Apple). Dedicated support team and help centre. Over 1,000 vouchers claimed with an average delivery time of under a minute.
How to buy a DET voucher from Comet (step by step)
The entire process takes under 2 minutes. Most students receive their code in under a minute.
Step 1: Visit the Comet DET voucher page.
Go to cialfo.co/duolingo-english-test-discount. Click “Get Your Voucher.”
Step 2: Pay securely via Stripe.
Enter your card details. Stripe handles the payment – the same infrastructure used by Amazon, Google, and Apple. Your voucher code starts generating the moment you pay.
Step 3: Receive your voucher code – instantly.
Your unique DET voucher code and a step-by-step redemption guide land in your email inbox in under a minute. No manual review, no delay. As the Comet landing page says: delivered before you close this tab.
That’s it. Three steps. Under a minute. Save up to 15%. No forms, no waiting, no expired codes.
Pro tips:
- Check your spam folder. If you don’t see the email within a couple of minutes, check spam or Gmail’s Promotions tab.
- Screenshot the code. Keep a backup in your phone’s photo gallery so you never lose access.
- Redeem soon. While codes have a generous validity period, redeem within a few weeks of purchase for the best experience.
How to redeem your DET voucher code
Once you have your code, here’s how to use it. Watch the walkthrough video or follow the steps below:
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Step 1: Go to englishtest.duolingo.com and log in (or create a free account). This is the test platform – not the regular Duolingo language-learning app.
Step 2: Click “Buy a test” to reach the checkout page.
Step 3: Find the “Voucher code” or “Promo code” field on the payment page.
Step 4: Paste your voucher code exactly as it appears in your email. The code is case-sensitive and space-sensitive – copy-paste rather than typing manually.
Step 5: Click “Apply.” The price updates from $70 to $0 (you’ve already paid $60 through Comet).
Step 6: Complete the booking. Take the test immediately (DET is available 24/7) or schedule it for later.
Troubleshooting:
- Extra spaces: The most common issue. Re-copy the code with no trailing spaces or line breaks.
- Wrong website: Must be englishtest.duolingo.com, not duolingo.com or the mobile app.
- Already used: Each code is single-use. If someone else entered it first, it won’t work again.
- Browser extensions: Ad blockers or VPNs can interfere with checkout. Try a clean browser profile.
- Still not working? Contact Comet’s support team with your order confirmation and the exact error message.
For a more detailed walkthrough, see our complete DET voucher redemption guide.
What happens after you redeem?
Once your voucher is applied and your test is booked:
Take the test immediately or schedule it. DET is available 24/7 – no test centre, no travel, no appointment slots. Any computer with a camera, microphone, and stable internet works. You need a quiet, well-lit room where you’re alone.
The test takes about 1 hour. It’s adaptive – difficulty adjusts based on your responses. Four scored sections: Literacy (reading + writing), Comprehension (reading + listening), Conversation (listening + speaking), and Production (writing + speaking).
Results arrive in as little as 24 hours. Compare that to IELTS (up to 13 days) or TOEFL (4–8 days). Most DET students receive results the same day or the next day.
Send scores to unlimited universities – free. IELTS and TOEFL charge $20 per additional score report. DET sends to as many institutions as you want at no extra cost. Applying to 10 universities? That’s $120+ saved on score reports alone, on top of the $10 you saved on the test fee through Comet.
Your video interview is included. You’ll record a short video interview during the test that gets sent to universities alongside your score – giving admissions teams a sense of your spoken English in a natural context.
DET voucher vs the two-test bundle – which saves more?
Duolingo offers a two-test bundle for $110 ($55 per test). Here’s every scenario:
| Scenario | Official single | Official bundle | Comet voucher | Smartest choice |
|---|---|---|---|---|
| Taking 1 test | $70 | N/A (must buy 2) | $60 | Comet ($60) – save up to 15% |
| Taking 2 tests (certain) | $140 | $110 | $120 | Depends on your priority |
| Taking 1, maybe 2 | $70 + $70 = $140 | $110 upfront | $60 + $60 = $120 | Comet ($60–$120) – flexibility wins |
For one test: Comet at $60 is the clear winner. You save up to 15% and you’re not locked into a second test you may not need.
For two tests: The official bundle saves $10 more than two Comet vouchers – but you must commit upfront, there’s no refund on the unused test, and you miss the instant delivery and Stripe-secured payment that Comet provides.
For “maybe two” (the most common scenario): Buy one Comet voucher for $60. Take the test. DET’s adaptive format produces accurate results on the first attempt for most students. Happy with your score? You’ve spent $60 total. Need a retake? Buy a second voucher – $120 total, with the flexibility to stop at one.
What does $10 actually save you?
$10 may sound small. But for students managing dozens of application expenses simultaneously, it adds up fast.
Here’s what $10 covers in the context of a university application:
- One university application fee at many institutions (some charge exactly $10–$15 for supplemental applications)
- A month of Grammarly Premium for polishing your personal statement
- Two official transcript deliveries at most universities
- 5 additional TOEFL score reports – or you could take DET through Comet and send unlimited reports for free
For students in countries where the local currency is weaker against USD, the saving is even more significant. $10 USD represents meaningful purchasing power in India, Nepal, Nigeria, Pakistan, the Philippines, and dozens of other countries where DET is popular.
Every dollar saved on testing is a dollar available for applications, visa fees, or living expenses. Comet exists to make that margin a little wider.
DET vouchers for institutions and counsellors
If you’re a school counsellor, education consultant, or institution looking to provide DET vouchers to your students at scale, Cialfo offers institutional partnerships.
What institutions get: Bulk voucher pricing, streamlined distribution, integration with Cialfo’s admissions platform, and dedicated account management. Cialfo already works with 2,000+ partner institutions all over the globe.
Why institutions choose Comet: Joining the GPN directly requires meeting Duolingo’s volume thresholds and managing distribution logistics. Purchasing through Comet provides the same outcome – students get discounted vouchers – with less administrative overhead and the fastest delivery in the market.
Get started: Contact the Cialfo team through cialfo.co for institutional pricing tailored to your size and needs.
Common mistakes when using a DET voucher
1. Adding spaces when copying the code. The code field is case-sensitive and space-sensitive. Copy-paste carefully – even one invisible character causes rejection.
2. Applying the code after payment. The voucher must be entered during checkout, before you confirm. There’s no way to retroactively apply it to a full-price purchase.
3. Confusing DET with regular Duolingo. The Duolingo English Test (englishtest.duolingo.com) is separate from the free Duolingo language-learning app (duolingo.com). Your voucher code only works on the test platform.
4. Waiting too long. Redeem within a few weeks of purchase. Don’t buy months in advance “just in case.”
5. Sharing the code. Each code is single-use. If someone else redeems it first, it won’t work for you and can’t be reversed. Treat it like a password.
6. Browser interference. Ad blockers, privacy extensions, or VPNs can disrupt the checkout page. Try a clean browser profile if your code isn’t being accepted.
Frequently asked questions
Yes. Comet is an official Duolingo English Test partner, powered by Cialfo – trusted by 310,000+ students and 2,000+ partner institutions all over the globe. Voucher codes are issued directly by Duolingo’s system. Over 1,000 students have already claimed their DET voucher through Comet.
You save up to 15% – $60 instead of the official $70.
In under a minute. Comet is the world’s fastest DET voucher platform. The process is fully automated: the moment your Stripe payment clears, your unique code and a step-by-step redemption guide are generated and emailed instantly. No manual review, no batch processing. Most students receive their code before they close the browser tab.
Voucher codes have a validity period. Redeem within a few weeks of purchase for the best experience. Contact Comet’s support team if you have questions about expiry.
No. Your DET score certificate is identical regardless of how you paid. There is no field, flag, or indicator that distinguishes voucher-purchased tests from direct purchases. Universities see your score, subscores, and video interview – not your payment method.
No. The voucher is for the official, scored Duolingo English Test only. The DET Practice Test is free and can be taken as many times as you want.
Yes. Identical test, identical scoring, identical certificate, identical acceptance by 6,000+ universities. The voucher changes how payment is processed – nothing else.
No. DET is available 24/7, every day of the year. Take it immediately after redeeming your voucher or schedule it for a future date.
Comet accepts major credit and debit cards, processed securely through Stripe. Visit the landing page for the most current options.
Yes. Cialfo works with 2,000+ partner institutions. Contact the team through cialfo.co for institutional pricing.
Check for extra spaces, correct capitalisation, and make sure you’re on englishtest.duolingo.com (not duolingo.com). Try a different browser if needed. If the issue persists, contact Comet’s support team with your order confirmation and the exact error message.
Yes. Comet vouchers work globally. Students from India, Singapore, Nepal, China, Australia, Canada, the UK, and beyond use Comet for their DET vouchers. As long as you can access englishtest.duolingo.com and meet the test requirements, your country doesn’t matter.
Comet offers the strongest combination of price, speed, and trust. You save up to 15%, receive your code in under a minute, pay securely via Stripe, and are backed by Cialfo’s 310,000+ student network. Some smaller, region-specific sellers may advertise marginally lower prices, but none match Comet’s instant delivery, global accessibility, and enterprise-level support.
Over 6,000 institutions worldwide accept DET, including top universities in the US, Canada, the UK, Australia, and more. Check the full list on Duolingo’s website.
Score requirements vary by university and programme. Most competitive programmes require DET scores of 110–130+. For a detailed breakdown, see our DET score guide
Next steps
You’re under a minute away from saving up to 15% on the Duolingo English Test. Comet delivers your voucher code instantly – no other platform is faster.
→ Get your DET voucher for $60 – instant delivery
Once you’ve purchased, head to our step-by-step redemption guide for a detailed walkthrough. Planning to take the test soon? Our DET preparation guide covers study plans, free resources, and section-by-section strategies. And if you’re still deciding whether DET is right for you, check our DET vs IELTS vs TOEFL comparison.
Not sure what score you need? Our DET score guide breaks down requirements by university, with IELTS and TOEFL conversion tables.
Join the community: Have questions? Connect with other DET students in the Comet WhatsApp Community.
Related guides from Cialfo:
- How to Redeem a DET Voucher Code
- DET vs IELTS vs TOEFL vs PTE: Which Test Should You Take?
- DET Scores Explained: What’s a Good Score?
- How Much Does the Duolingo English Test Really Cost?
- How to Prepare for the Duolingo English Test
- Universities That Accept the Duolingo English Test
- The Complete Guide to the Duolingo English Test
