Rebotomy vs Missing Num
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rebotomy
Learn new languages through immersive, native-only audio and visual association. This app utilizes spaced repetition algorithms that adapt to your learning pace, incorporating speaking practice and voice recognition for effective skill development.
- Native language learning
- Image-based sentence association
- Adaptive spaced repetition
- Speaking practice
- Voice recognition
- Multiple languages available
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BIG NEWS: AS OF TODAY, ALL STACKS ARE FREE! ENJOY! Easily learn a new language. Many languages available: English, Russian, Spanish, French, Italian, Chinese, Arabic, Portuguese, German, Vietnamese, Cantonese, Urdu, Japanese, Korean, Polish, Hindi, Hebrew, Czech, Ukrainian and we add more frequently. Native learning, only the new language is spoken, no English. You associate spoken sentences with images. Based on your responses, Reverse Lobotomy learns the appropriate interval to present spaced repetitions. Now Included: Speaking practice and voice recognition!
Missing Num
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Simple Game. Finding a Missing Number is an excellent way to reinforce number recognition. Time Trial.
Screenshots
Verdict
The clearest difference is in-app purchases: Missing Num at none against Rebotomy's 10. Rebotomy's advantage is ads (none vs shown) and update cadence (every 5 weeks vs every 11 months). On price 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. Rebotomy sells 10 one-off in-app purchases. Missing Num asks for nothing beyond the download.
Rebotomy ships an update every 5 weeks, Missing Num every 11 months. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.
| Parameter | Rebotomy | Missing Num |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (24 ratings) — better | — |
| Positive reviews | 87.0% of reviews | — |
| Number of ratings | 24 — better | — |
| Update frequency | Every 5 weeks — better | Every 11 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 24 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | MassLight, Inc. | Yasuyoshi Ota |
Bugs and requests
Rebotomy
Reported bugs
10 issues- Paid languages disappeared after phone change
- Paid languages corrupted and un-downloadable
- Restore purchase not working
- App crashes when going back through previous lessons
- Speech recognition crashes sometimes
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- Minor voice recognition issues
- Ads in main menu after in-app purchases
- Error in Japanese module (masculine/neutral 'they' used for feminine)
- Mandarin Chinese pronunciation errors ('Yi Tiao Go', 'Yi Tiao Mao')
- Japanese 5 installation trouble
Requested features
16 requests- Add American languages (Quechua, Guaraní)
- Add traditional Chinese characters
- Add English captions to images
- Add cartoon images for children
- Add writing practice activity
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- Add more variety of quiz question types
- Add option to not show photos in quizzes
- Add option to only listen for quizzes
- Add Wolof language
- Add Pinyin to Mandarin Chinese
- Add Italian language
- Add explanation of how lessons work
- Track different users
- Improve auditory section for pronunciation practice
- Add dark mode option
- Add advanced analytics dashboard
Missing Num
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Rebotomy
- French 2$1.99
- Spanish 2$1.99
- Spanish 3$1.99
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- Arabic *All Access Pass*$14.99
- French *All Access Pass*$14.99
- German *All Access Pass*$14.99
- Italian *All Access Pass*$14.99
- Portuguese *All Access Pass*$14.99
- Russian *All Access Pass*$14.99
- Spanish *All Access Pass*$14.99
Missing Num
No in-app purchases
