Updated September 2026: this comparison was first written from our July 2026 test. PrepEx AI has since updated its reports and asked us to update the stale information based on its latest changes, so we re-ran it on 2026-09-25 and refreshed the post. Its current reports add per-sentence practice on Listen and Repeat and written coaching on each interview answer, and the sections below now describe those. We also corrected how this post described TOEFLAIR’s own Listen and Repeat retry, its cause labels, and its writing dimensions.
PrepEx AI and TOEFLAIR both score TOEFL Speaking on the 2026 1–6 band, and both go well past the number. Each shows you the sentence you missed on Listen and Repeat and the words to fix on Take an Interview.
We logged into PrepEx AI and read its full reports, every tab, in September 2026. Then we set them beside what TOEFLAIR ships.
The difference is in what the feedback is built around. PrepEx starts from your own words, coaching the wording you used and leaving room to practice again without a score. TOEFLAIR starts from a fixed frame and measures every attempt against the same structure, so results stay comparable from one try to the next.
What PrepEx AI Offers
PrepEx AI is a large, established platform, reporting 75,000+ students across 86 countries. One account now covers five tests (TOEFL, IELTS, PTE, CELPIP, and the Duolingo English Test). Its TOEFL pricing page lists 3,500+ questions across all four sections.
Its AI coach, Petra, runs through every report, with a coaching lesson and a practice space for each.
Listen and Repeat: Practice a Sentence, or Re-grade One Issue
We ran a fresh PrepEx AI set, “Tutoring Center,” 7 sentences. It scored 67/100 and 4.5/6. Each sentence gets its own 1–6 score, five signals (content, pronunciation, fluency, pace, words matched), and the original wording beside what the recognizer heard:
| Sentence | Score /6 | Original | Recognized |
|---|---|---|---|
| 2 | 2 | ”Walk-in tutoring is available daily." | "Work on jewelry is better daily.” |
| 6 | 3 | ”If you need help with writing assignments, visit the writing lab next door." | "If you needed help on the writing, you can go to the writing labs in the next door.” |
Its feedback points you to those sentences and asks you to compare the wording, then repeat the full sentence. Every sentence also has its own retry, where you record one try and play it against the original. However, the retry is practice only. You hear your try next to the original, but nothing tells you whether it got better, and the try is not saved to your account.
TOEFLAIR scores the set on repeat accuracy, intelligibility, and fluency. Each flagged issue carries one of three causes: pronunciation for a mispronounced word, listening for a dropped or added word, expression for a broken phrase or flat intonation.
You pick one issue and say the whole sentence again. That retry is graded against your original (STILL, IMPROVED, or FIXED) with the score before and after. It stays in the issue’s history.
Both let you work on one sentence at a time. TOEFLAIR’s retry is scored and saved to the issue’s history. PrepEx’s per-sentence practice stays local and unscored, and it is open on every sentence in the report.
Take an Interview: Coaching by Passage, or by Part
Our PrepEx AI interview is the “Travel Preferences” set from July 2026, reopened in PrepEx’s current report on 2026-09-25. It scored 4/6, with diagnostics of Delivery 94, Language use 51, and Topic development 80 out of 100. The report also breaks those three areas down per question, out of 5.
Every answer comes with a transcript and a paragraph that quotes what to fix. On our first answer, it corrected “as the end of the sea” to “by the sea,” flagged the extra article in “a dirty water,” and pointed out repeated words such as “annoying annoying smelling.”
A per-question coaching lesson goes further. It highlights a passage, explains what that passage does for a listener, and offers three rewrites. For our third answer, it flagged an ending that trailed off:
PrepEx coaching, question 3: “The thought remains incomplete at the end because the sentence cuts off before explaining how the income improves life quality.”
One of its three rewrites finishes that sentence. You can re-record any single answer as ungraded practice, and Pro adds Mid, Good, and Perfect example answers for each question.
TOEFLAIR scores the same three areas, overall and per question. It then splits each answer into three parts (opening, support, and closing). Each part is rated strong, fair, or weak, with what is off and how to improve it.
Each question also gets a Perfect Answer: two model answers, one built on your own angle and one on a different angle, with every part annotated with the scoring standard it meets. TOEFLAIR does not offer a way to re-record a single interview question yet.
Both tell you in words what to fix. TOEFLAIR maps each answer’s structure and mirrors it in its model answers. PrepEx coaches passage by passage and also lets you re-record any single answer, which TOEFLAIR does not offer yet.
Side by Side
| Feature | PrepEx AI | TOEFLAIR |
|---|---|---|
| Tests covered | TOEFL (all four sections), IELTS, PTE, CELPIP, DET | TOEFL Speaking and Writing |
| Listen and Repeat feedback | Per-sentence 1–6 score, five signals, original vs. recognized wording | Three dimensions, plus a cause on each flagged issue (Pronunciation, Listening, Expression) |
| Work on one Listen and Repeat sentence | Yes, as local practice, not graded or saved | Yes, aimed at one flagged issue, graded and saved (2 per session on free) |
| Take an Interview feedback | Three rubric diagnostics, written fixes per answer, a coaching lesson per question | Three dimensions, opening / support / closing rated with fixes |
| Re-record one interview answer | Yes, ungraded | Not available |
| Interview model answers | Mid, Good, Perfect per question (Pro) | Two annotated answers per question (free) |
| Writing feedback | Sentence-level corrections with reasons, plus a priority and revision space | Four dimensions per task, notes anchored to your sentences |
| Pro pricing | $39.99/mo, or $89.99 per 3 months (about $30/mo), auto-renews | $20 for 1 month, $51 for 3 (about $17/mo), $90 for 6 (about $15/mo), no auto-renewal |
| Free tier | 3 practices a day, reset daily | 5–6 designated free sets per practice type |
| Scale | 75,000+ students (PrepEx’s figure), 3,500+ TOEFL questions | 500+ registered users (our own count) |
TOEFLAIR covers two TOEFL sections and scores against a fixed structure. PrepEx AI covers far more ground, across five tests and every TOEFL section.
Which One Should You Use?
Pick PrepEx AI if you want one account for several tests or every TOEFL section, a large question bank, and coaching that works through your answer passage by passage. Its in-report practice lets you retry a sentence or an answer without it touching your saved score. Its writing reports also return sentence-level corrections on both writing tasks. You can see its plans on prepex.ai.
Pick TOEFLAIR if you are focused on TOEFL Speaking and Writing and want a scored record of whether a specific fix worked. Its Listen and Repeat retry is graded against your first attempt. Its interview feedback maps each answer to three parts and pairs it with annotated model answers on the free plan. The free plan also includes 2 graded Listen and Repeat retries per session.