A vs Mainichi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
A
Create unique geometric shapes through iterative affine transformations. Apply translations, rotations, and scaling to various objects with gradient coloring to generate visually interesting results.
- Affine transformation for shape creation
- Translation, rotation, and scaling
- Gradient coloring
- Supports circles, rectangles, stars, polygons, and lines
- Iterative shape generation
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This app allows you to create interesting shapes using affine transformation. Affine transformation can do translation, rotation and scaling on object's coordinate. We do iterations, and in each iteration we apply the affine transformation on the object (circle, rectangle, star, polygon or line), coloured in gradient. At the end, you may like the result. Have fun.
Mainichi
Master Japanese vocabulary with a gamified, spaced repetition system. Progress through levels of mastery, unlock regions on an interactive map, and enjoy engaging study sessions with boss battles and dice rolls. Start learning for free and build a vocabulary that truly sticks.
- Spaced repetition system (SRS)
- Gamified learning with boss battles
- Interactive map of Japan
- Seven stages of vocabulary mastery
- Daily learning ritual
- Unlock new words and regions
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Build a real Japanese vocabulary, word by word. 20,000+ words, SRS-powered, with boss battles and gamification that keep you coming back. A VOCABULARY THAT ACTUALLY STICKS Mainichi uses spaced repetition to adapt to how well you know each word. Words you struggle with come back more often. Words you're comfortable with step back — until you've truly mastered them. Progress through seven stages of mastery: Shoshin, Minarai, Senpai, Sensei, Shihan, Meijin, and finally Burned. When a word is Burned, it's yours forever. STUDY SESSIONS YOU ACTUALLY LOOK FORWARD TO Fight Oni bosses. Hunt for treasures. Roll the Yokai Dice for bonus XP. Mainichi turns vocabulary drilling into something you actually look forward to — a daily ritual you'll miss when you skip it. EXPLORE JAPAN, WORD BY WORD As your vocabulary grows, you unlock Japan's 47 prefectures on an interactive map. Start in familiar territory and work your way north to Hokkaido, south to Okinawa — one word at a time. Your adventure starts with a single word. Download Mainichi — free to start, impossible to put down. Terms of Use: https://mainichiapp.com/docs/terms-of-service
Screenshots
Verdict
The clearest difference is in-app purchases: A at none against Mainichi's 3. Mainichi's advantage is update cadence (every 5 days vs every 70 months). On price, rating, ratings volume and ads 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. Mainichi sells 3 in-app purchases, starting at $6.99 per month. A asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for A against 5.0 for Mainichi. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
A ships an update every 70 months, Mainichi every 5 days. The most recent releases landed on October 16, 2026 and October 31, 2026 respectively.
| Parameter | A | Mainichi |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 70 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 24 MB | 64 MB |
| Age rating | 4+ | 9+ |
| Developer | Johannes Dwiartanto | Michal Paczynski |
In-app purchases
A
No in-app purchases
Mainichi
- Mainichi Premium Monthly7 Days trial$6.991 Month
- Mainichi Premium Yearly7 Days trial$58.901 Year
- Mainichi Lifetime$149.99
