Tago Write vs OtoOi Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tago Write
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Start with one Korean sentence. Read the feedback, revise it yourself, and use a saved expression in your next sentence. Daily writing and TOPIK practice. KOREAN WRITING, FROM EVERYDAY THOUGHTS TO TOPIK Tago Write helps you practice Korean through diaries, topics you care about, and TOPIK II writing questions. CHOOSE WHAT TO PRACTICE Start with a recommended task or choose another practice. Write about K-pop, dramas, travel, food, beauty, and webtoons. Adjust the available difficulty to find a useful challenge. WRITE THROUGH EVERYDAY SITUATIONS Try three-part scenes at a café, a place to stay, or a concert venue. Read what the other person says and write your reply in Korean. Each scene uses one AI feedback request; continue at your own pace. FEEDBACK THAT FITS YOUR WRITING Diary and interest writing focus on whether your meaning comes across and how to express it naturally in Korean. TOPIK feedback follows the question type. Submit your writing, follow processing on Home, and open the result when it is ready. PRACTICE TOPIK II QUESTIONS 51–54 Practice fill-in questions, graph descriptions, and essays. Use a Korean manuscript-paper layout for longer writing. Evaluate a complete 51–54 mock set to update your learning-level journey. Individual Q54 feedback may include an estimate for that piece; it does not update the journey. KEEP WHAT YOU WANT TO REMEMBER Choose which expressions to save from feedback. Organize them in folders, review with flashcards, and track their learning status. Your submitted writing remains in History. BUILD THE BASICS Start with Hangul lessons or copy Korean sentences to practice spelling and spacing. Copy practice identifies missing, extra, or incorrect text and keeps its hints above the keyboard. English-, Chinese-, and Vietnamese-speaking beginners have dedicated pronunciation courses. YOUR LANGUAGE, YOUR PACE App navigation and AI feedback support English, Japanese, Vietnamese, Simplified Chinese, and Traditional Chinese. Task translation availability may vary; Korean source text remains available when a translation is missing. AI feedback is available up to five times per day, including at most one diary submission. Copying and other non-AI practice remain available after the limit. PLEASE NOTE AI scores and feedback are learning aids and may contain errors. Tago Write is not an official TOPIK app and does not guarantee an official score, level, or test result. Contact us through Settings in the app.
OtoOi Reader
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OtoOi Reader is a Korean reading app with something new every day. Read real-life Korean the way it is written — online forum posts with their comment threads, short travel stories, and news written from the facts — sentence by sentence, with audio for every sentence. ■What you can read • K-Drama Next Door — short dramas written in the style of Korean online forums: advice posts and real-life stories, comments and all. After the ending, the author explains the twist and the everyday life behind it. A new episode every day. • Kai's Train Trips — Kai rides the KTX to cities around Korea and discovers the local food. Travel notes with the facts and sources. • News — Korean news written from the facts, in an Easy and a Standard version. • Story — Kai's everyday life in Korea, told in short conversations (beginner level). ■How it helps you read • Read first, then check: open the English translation one sentence at a time. • Tap a word for its meaning in that sentence, its dictionary form and how it is conjugated. • Tap an underlined grammar pattern for a short explanation of how it works in that sentence. • Audio for every sentence. • A TOPIK level for every piece, so you can find what fits you. ■Words — see your Korean grow • Mark words and grammar as Known, Learning or Not yet while you read. • See how many TOPIK level 1–6 words and grammar patterns you know, level by level. • Your known-word rate on every piece shows what you can read next. • Word cards: check the meanings of words you met while reading, or marked Learning, in a five-option quiz, then update your Known and Learning marks from the results. Every sentence is written by us, so there is no material to hunt for. • Look back at your Known-words chart week by week (month by month with Pro). ■Subscription New pieces are free for 7 days after they come out. Older pieces: the Korean text and audio are free; the translations, word meanings and explanations are part of OtoOi Reader Pro, along with all TOPIK levels and your full history in Words. 7-day free trial. Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless it is turned off at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. Terms of Use: https://otooi.com/en/terms Privacy Policy: https://otooi.com/en/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: Tago Write at none against OtoOi Reader's 2. OtoOi Reader's advantage is update cadence (every 3 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. OtoOi Reader sells 2 in-app purchases, starting at $2.99 per month. Tago Write asks for nothing beyond the download.
Tago Write ships an update every 9 days, OtoOi Reader every 3 days. Both last shipped on November 6, 2026.
| Parameter | Tago Write | OtoOi Reader |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 125 MB | 29 MB |
| Age rating | 4+ | 12+ |
| Developer | Chanwoo Song | Yutaka Imai |
In-app purchases
Tago Write
No in-app purchases
OtoOi Reader
- Monthly plan7 Days trial$2.991 Month
- Annual plan7 Days trial$24.991 Year





