Immersion Reader vs Yomu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Immersion Reader
Easily look up Japanese words while reading ebooks with a single tap. Import custom dictionaries and export saved vocabulary for spaced repetition learning. Offers customizable themes for a comfortable reading experience.
- One-tap word lookup in Japanese ebooks
- Import Yomichan and frequency dictionaries
- Export vocabulary to Anki
- Light and dark mode themes
- Lookup neighboring words
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Look up Japanese words as you read! Features - One tap to look up words in Japanese Ebooks. Tabs to help you look up neighboring words - Import Yomichan dictionaries and frequency dictionaries - Export saved vocabulary to Anki via Anki Dojo - Light mode, dark mode, and other themes for the dictionary
Yomu
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Yomu turns reading Japanese from guesswork into confident understanding. Read real articles, books, and manga excerpts with adaptive furigana, instant offline dictionary, and optional power features—no subscriptions. WHAT MAKES YOMU DIFFERENT • Adaptive Furigana: Match readings to your JLPT level. Hide kanji you know, show help where you need it. • Instant Offline Dictionary: Tap any word for clear definitions—works without a connection. • Difficulty Preview: See an automatic difficulty estimate before you start reading. • Focused Reader: Clean, distraction-free layout for staying in the flow. POWER FEATURES (ONE-TIME PURCHASE) • Camera & OCR Import: Scan printed Japanese and read it with tappable text. • Vocabulary Builder: Save words as you read; export to CSV for Anki. • Reading Stats: Track volume, streaks, and vocabulary growth. SHARE & IMPORT ANYWHERE • Send text from Safari and other apps via the Share menu—no copy-paste. • Keep all your Japanese texts organized in one library and available offline. PRIVACY & PEACE OF MIND • No ads, no subscriptions, no tracking of what you read. • Your library, vocabulary, and stats stay on your device. Privacy policy: https://yomuapp.kulman.sk/privacy
Screenshots
Verdict
The clearest difference is update cadence: Immersion Reader at every 6 days against Yomu's fortnightly. Immersion Reader also leads on iOS requirement (13.0 vs 18.0). On price, ads, in-app purchases and device support 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. Immersion Reader sells 1 one-off in-app purchase and Yomu sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Immersion Reader ships an update every 6 days, Yomu fortnightly. Both last shipped on October 24, 2026.
| Parameter | Immersion Reader | Yomu |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (27 ratings) — better | — |
| Positive reviews | 61.5% of reviews | — |
| Number of ratings | 27 — better | — |
| Update frequency | Every 6 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 80 MB | 128 MB |
| Age rating | 4+ | 4+ |
| Developer | Mathew Chan | Igor Kulman |
In-app purchases
Immersion Reader
- Immersion Reader Premium$4.99
Yomu
- Premium$9.99








