Drop in your lecture notes, get exam questions out: a 22-year-old Korean university student's exam-week app that picked up 620k sign-ups from Reels

UnivAI (유니브 AI) is an AI study app for Korean university students cramming before exams: upload lecture PDFs, YouTube courses, or class recordings, and it gives you summaries, exam-style questions, flashcards, and mind maps. Its features are about the same as dozens of similar tools worldwide. What made it break out is two things: it compressed the pitch into one line, "notes into exam questions," and it put all its creator promotion into the two or three weeks before midterms and finals. Anyone who wants to follow can copy the playbook, but its own bad reviews show this business struggles to keep people.

A video asking about GPAs

In Oct 2026, a week before midterms, UnivAI's own TikTok account @univai8 posted a short video titled "이분들 학점이 왜이리 높지 😭" (Why are these people's GPAs so high). The format is street interviews: they stop several university students and ask their GPA, and commenters work out that Seoul National University uses a 4-point scale, which suggests the students asked were from SNU (inferred). By Nov 4.3 the video had about 6k views and 830k likes. The most-liked comment (21 likes) is "5,919이 젤 행복해보임" (The one who got 2.3 looks the happiest). The person who reported 2.3 seems to be the happiest.

The only product-related element in the video is the tag #유니브. One commenter saw through it: "유니브 홍보 ㅎㄷㄷ" (UnivAI's ad, scary). The same account then posted "너의학점은 😃" (What's your GPA, 129k views) and "서울대생 학점 맞추기" (Guessing SNU students' GPAs, 28k views) over the following week. The previous concentrated push was in 2025 December, just before finals; the "너의 학점은 ??" video from then got 145k views (TikTok, 11-06).

Next, a five-star App Store Korea review from Sep 29: "유명해져 아니 유명해지지마 나만 알거야 인스타 릴스에 '나도' 댓글달아야지만 겨우 알 수 있게 할거야" (Get famous? No, don't get famous, I want to keep it to myself. You can only find out by commenting "나도" (me too) under the Instagram Reels). It captures how it acquires users: leave one word under a Reel and get the link sent to you by automatic DM.

What it is

Open UnivAI, drop in this semester's lecture PDFs, a YouTube course, or a class you recorded, and it produces:

• Summaries and "쉬운 설명" (simple explanations), with source page numbers;
• Exam-style multiple-choice and fill-in-the-blank questions, with wrong answers drilled again and an explanation of which concept you got wrong;
• Flashcards, mind maps, and mock exams;
• An AI tutor that answers only from the materials you uploaded, by text or voice.

Real-time transcription of class recordings is unlimited on the free plan, which is the sign-up hook. The free plan allows only 2 PDFs and 2 YouTube videos per week, and a course's exam notes usually exceed that, so the paywall naturally lands during exam week. Pro has no upload limit; reviews mention a price of ₩9,900 per month (about $7); Ultra adds unlimited mock exams and voice tutoring, for people studying several courses at once. On Google Play, in-app purchases are priced $6.99–$119.99. On the web, payments in Korea run through KakaoPay and Toss, and overseas through Polar (official site, 11-06).

Who made it

The developer is Singularity Inc. (株式会社싱귤래러티), located on the Hanyang University road in Ansan, Gyeonggi-do, right next to Hanyang University's ERICA campus. The CEO, Kim Seo-hyeon, is 22 years old and a student in the AI major at Hanyang University ERICA. In 2023 he won a top prize at a GPT app startup competition, and the school gave about ₩29M in startup support (JoongAng Ilbo, 2025-11-26). The company was founded in 2024 June, and in 2025 August it received seed investment from accelerator Primer and took first place in the DeepTech track of the Korean SMEs and Startups Ministry's startup support program (founder's LinkedIn, thevc).

In other words, the people building it are users themselves: university students who are studying and go through exam week every semester.

How big the traffic is, and where it comes from

620k sign-ups far exceed 98k Android installs, so most come from iPhone, iPad, and web. Korean university students have a high share of iPhone, and many take notes on iPad, so this distribution makes sense. Android growth is now flat after midterms, so the peak in mid-to-late October before exams isn't visible.

Almost all acquisition runs through Instagram, and all of it is timed to exam week:

1. Paid creator promotion by university students. In 2025 December and 2026 October, batches of university student Reels tagged #협찬 (sponsored) and #광고 (ad) appeared, with captions like "시험 대비는 유니브 ai 하나면 된다" (For exam prep, UnivAI alone is enough), linking to the official landing page. Some posts don't label themselves as ads and instead emphasize "(광고X)" (not an ad) as a recommendation; whether they were paid can't be determined.
2. Comments that ask for a keyword to get the link. This is the "나도" from the comment at the start. Comments boost the Reel's engagement, and the DM delivers the link straight to the person.
3. Campus ambassadors. The official "AI STUDY CREW" recruits members whose full month's subscription is reimbursed, in exchange for them creating content themselves.
4. Naver blog. Searching "유니브 AI 후기" (UnivAI review) or "유니브 AI 가격" (UnivAI price) turns up a string of "솔직 후기" (honest reviews), mostly in the style of trial-group write-ups, catching people who saw a Reel and then searched.
5. Owned accounts. IG @univai_official has 18k followers; the TikTok account is the one from the opening, and it also posts heavily before exams.

Users themselves admit they came from Reels. Several quotes pinned on the official homepage say things like "필기한걸 토대로 문제 만들어준다는 릴스 보고 깔아봤는데" (I saw a Reel saying it makes questions from your notes, so I installed it). Separately, an Apple Korea editor mentioned it in an iPad recommendation article.

Whether it has run paid Meta ads can't be verified from public information.

What users say: specific praise, specific complaints

The people who praise it say the same thing: the questions are better than other apps'. "Other apps merge two different concepts from the same page into one question, this one doesn't, and the questions don't repeat" (10-21); "For question generation, I think it's number one among AI apps" (9-09); "벼락치기 할 때 개사기임" (Absolutely broken for cramming, 10-18). One student wrote a feature checklist in a review: whether the recording transcription is searchable, whether AI tutoring can read materials for the same course together, and whether exam info images from campus forums can be put in the course folder.

But since June 2026, new App Store Korea reviews have clearly had more one-star than five-star ratings, and the complaints cluster around three issues:

• It made up questions from things not in the notes. Comments like "피피티에 없는 내용으로 마음대로 문제 만듦" (Made up questions on content not in the PPT, 6-16) have appeared more than a dozen times. In September someone wrote: "Since the summary model switched to GPT it got worse… I moved to Lilys AI and it's much better."
• It failed during exam week. Crashes, slow loading, and recording transcription that heats the phone and drains the battery. One review: "I recorded, uploaded, and not a single word was transcribed; when I tried to export to another AI, the recording was gone, and that was a whole class for me" (11-01). Another one-star title reads "잘가시게 비록 나의 중간고사는 버려졌지만" (Goodbye, my midterms are already ruined, though, 10-23).
• Subscriptions can't be canceled. From June to August there was a string of "I canceled and they still charged me" and "I emailed for weeks and no one replied." One person said it bluntly: "They pushed the viral marketing so hard that I paid" (11-01).

There's also a more basic signal: "Exams are over and I forgot to cancel. Can you refund this month? I'll pay again during exam period" (6-24). Users need it only during exam season, twice a semester, for two or three weeks each time. That shape makes it hard to keep people through renewals; it has to win attention again every exam period.

Who it's competing with

Copycats have already shown up: "벼락치기AI - 대학생 시험 공부,PDF요약·퀴즈·필기" (listed 2026-03, 144 ratings in the Korean store) and "스터디 AI - 강의 녹음, PDF 요약, 모의고사", copying even the title structure. Both are still tiny (App Store, 11-06).

At the end of the day, the tech isn't the moat. What sets it apart from rivals is serving one scenario only, Korean university exam week, plus Instagram campus distribution that follows the exam calendar.

If it were you

B, worth a try. The playbook is clear and copyable, but the product itself has no moat: big-tech free tools sit right next to it, the need only shows up twice a semester, and the original's own reviews are already slipping.

Who it fits: one or two people, one of whom is already embedded in a student market that's heavy on Instagram (Japan, Taiwan, Vietnam, Thailand, Indonesia), who knows or can reach a batch of campus creators. The other makes the "lecture notes → questions" accuracy solid.

Who it doesn't fit: anyone aiming at the English market (Gizmo, Turbo, Quizlet are already crowded); anyone trying to go head-on with UnivAI in Korea (it and Lilys already own the mindshare, and copycats can't get traction); anyone counting on subscription renewals for long-term retention (users cancel once exams are over).

How to do it: one country, one language, one scenario: "turn lecture notes into exam questions before the test." Make UnivAI's most-criticized weak spots your selling points: every question cites the page number and original sentence from the notes, nothing outside the notes gets generated; recordings are stored locally before transcription so no data is lost during exam week; cancel and refund in one click. Price it as an "exam week pass" (say, a one-time payment for one month or two weeks), not default auto-renewal. That actually sells better.

How to get users: copy its calendar. Start three weeks before exams, recruit 20–30 university student creators to post Reels with the line "drop this week's notes in, get a set of questions out"; auto-DM anyone who comments a keyword with the link; trade free subscriptions for content from campus ambassadors; and publish a few "honest review" blog posts to catch search. Run your own accounts on street interviews about grades and exams, and don't pitch the product directly.

Deadline: Japanese university finals run from late January to early February in 2027, Taiwan's finals are in mid-January. Have the product built and the first batch of creators signed by mid-December, or you'll be stuck waiting for the 6–July round.

Signs you misread it: ① after the first exam-season push, paid conversion can't cover creator costs, and new sign-ups drop to zero a week after exams, so every round starts from zero spend again; ② NotebookLM or Gemini launches a free student "generate questions from notes" feature in your country and it spreads through campuses; ③ UnivAI itself expands to Japan and Taiwan with the same creator playbook. That would confirm the path is right, but you'd be competing with the original for the same creators.