The short answer
Acceptance decides it, not preference. Check every institution on your list before comparing anything else. Where both are accepted, the Duolingo English Test is shorter, cheaper, taken at home and returns a result in days; IELTS takes longer, happens at a test centre, and is accepted more widely — including for many visa and professional registration routes where the Duolingo English Test is not.
Most comparisons of these two tests are written to sell preparation for one of them. This one is written by people who sell practice for both, which removes that particular thumb from the scale but not every bias, so check the claims that matter to you against the official sources.
The differences that actually matter
| Duolingo English Test | IELTS | |
|---|---|---|
| Where | At home, on your own computer | A test centre, or IELTS Online for some versions |
| Length | About an hour | Just under three hours |
| Format | Adaptive — questions get harder as you do well | Fixed papers, the same for everyone that sitting |
| Speaking | Recorded answers, no human in the room | A live interview with an examiner |
| Results | Typically a few days | Typically several days to two weeks |
| Score scale | 10–160, in steps of five | Bands 0–9, in half bands |
| Cost | Lower | Higher |
| Acceptance | Wide and growing in higher education | Wider, and established for visas and professional bodies |
Costs, turnaround times and acceptance all change. Confirm them on the official websites and on your institution’s own admissions page before booking anything — this is the part of any comparison article that goes out of date first.
Not sure where you are starting from? Four questions, about two minutes, no sign-up — and you get an estimated score out of 160 to measure the rest of this against.
Is one of them easier?
Not in the way people mean. They are different shapes, and which one suits you depends on what you are good at.
- The Duolingo English Test rewards speed and composure. Tasks come at you quickly with little preparation time, and the adaptive format means it gets harder precisely when you are doing well. Candidates who freeze under time pressure find it harder, not easier.
- IELTS rewards stamina and structure. Three hours is a long time to concentrate, and the writing tasks reward a planned, conventional answer. Candidates who are strong but slow usually do better here.
- The speaking formats suit different people. Talking to a recording with no feedback unsettles some candidates; others find a live examiner far more intimidating. This is worth being honest with yourself about, because it is the difference most likely to cost you marks.
The at-home factor
Taking a test at home sounds like an advantage and is a genuine one for cost and convenience, but it adds requirements a test centre would have handled for you: a stable connection, a working camera and microphone, a quiet room, and no interruptions for the full hour. The rules on what may be in the room are strict, and a test can be invalidated after the fact. Read them properly rather than assuming.
How to decide, in order
Work through this in sequence and the decision usually makes itself.
- 1. Acceptance. List your institutions and check each one. If any require IELTS, that is your answer.
- 2. Purpose beyond admission. Visas, professional registration and some employers have their own lists, and these are where the Duolingo English Test is most often not accepted. Check what you will need after you are admitted, not only to be admitted.
- 3. Deadline. If you are close to one, the faster result and the ability to retake sooner matter more than any difference in difficulty.
- 4. Your own profile. Only now does it make sense to think about which format suits you. It is the last consideration, not the first.
If you have to prepare for both
It happens — one institution insists on IELTS while the rest accept either. The good news is that most of the underlying work transfers: vocabulary range, grammatical accuracy, and the ability to produce a coherent answer under time pressure are the same abilities in both tests.
What does not transfer is format fluency, and that is a real cost. Practise the formats separately and close to their respective test dates, rather than alternating between them in the same week. For most people the better plan is to pick one, sit it, and only prepare for the second if the first result falls short.