How to Use Your Duolingo English Test Discount Voucher

Last updated: October 2026

Comet’s Duolingo English Test (DET) voucher saves 15%, so you pay US$60 instead of US$70. Here is the whole process, from payment to redemption.

Step by step

1. Get your voucher. On Comet’s DET discount page, click “Get Your Voucher”.
2. Pay securely via Stripe. The cost is US$60.
3. Check your email. Your voucher code and a step-by-step redemption guide are sent automatically once payment clears.
4. Log in to your DET account. The voucher works for new and existing accounts, so create one if you don’t have one yet.
5. Choose “Redeem a Voucher”.
6. Enter your code and book your test.

The voucher works worldwide, and Comet says it applies to both at-home and test-centre DET formats.

If your voucher doesn’t arrive

• Check your spam and promotions folders.
• Wait a few minutes. Comet says delivery is usually instant and no more than 10 minutes.
• If it still hasn’t arrived, contact Comet support through the Help Center.

If your code doesn’t work

• Copy and paste it exactly, with no extra spaces.
• Enter it under “Redeem a Voucher”, not in a general promo field.
• Contact support if the problem continues.

After you book

Most DET results arrive within 24 hours, though Duolingo’s stated window can be up to 48 hours. The test is accepted by 6,000+ universities, but check visa rules separately. See our guide to whether the DET is accepted for student visas.

Frequently asked questions