Synthesis24 vs Spelling Hero
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Synthesis24
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"Synthesis 24" is a puzzle game based on mathematical logic. The specified numbers and operation symbols are formed into 3 formulas, so that the final answer is 24. There are hundreds of cleverly designed level modes and an endless mode with countless levels, waiting for you to challenge! Come and exercise your mathematical thinking Game Features: 1. Through the use of numbers and symbols, make the specified number calculate 24, exercise brain thinking. 2. Make the game more interesting by dragging. 3. Hundreds of cleverly designed levels that are extremely challenging. 4. Endless mode with countless levels to meet your needs to pass the time and exercise mathematical thinking. 5. Free forever. 6. Continue to update more levels and gameplay. Our games can exercise people's mathematical thinking ability, including oral and mental arithmetic, can develop intelligence, improve independent thinking ability and logical thinking. Simple numbers, including endless thinking and careful logic, and the fun of solving problems can all be reflected in our game. Come and try and experience the charm of numbers!
Spelling Hero
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Spelling Hero is a spelling practice app designed for kids who learn differently—ADHD, autism, dyslexia, and anyone who finds typical apps overstimulating. WHAT MAKES IT DIFFERENT: - Calm Mode: Mutes animations, colours, and keyboard feedback for sensory control (other apps only offer fonts) - Write on Paper: Spell words in the app, then practice writing them down—the proven method for spelling retention - One-time purchase—no subscriptions, no paywalls - Character-driven motivation: Collect buddy buddies like Milli the sloth, Phea the bunny, and Sammy the dinosaur - Parent & Teacher Dashboard: Track accuracy per word, 14-day activity, and identify tricky words FOR SCHOOLS & TEACHERS: Spelling Hero works for individual learners, intervention groups, and whole classes. Access codes available for classroom use. No ads No data sharing or tracking WCAG accessibility tested FREE to download. Full unlock is a one-time in-app purchase. Support URL: https://g2z9zgsqyv-del.github.io/Spelling-Hero/support.html Privacy Policy URL: https://g2z9zgsqyv-del.github.io/Spelling-Hero/
Screenshots
Verdict
The clearest difference is in-app purchases: Synthesis24 at none against Spelling Hero's 1. Synthesis24 also leads on iOS requirement (15.0 vs 17.6). Spelling Hero's advantage is update cadence (weekly vs every 3 months). On price, ads 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. Spelling Hero sells 1 one-off in-app purchase. Synthesis24 asks for nothing beyond the download.
Synthesis24 ships an update every 3 months, Spelling Hero weekly. The most recent releases landed on October 9, 2026 and October 25, 2026 respectively.
| Parameter | Synthesis24 | Spelling Hero |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 49 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | 杰超 杨 | Ryan Lodge |
In-app purchases
Synthesis24
No in-app purchases
Spelling Hero
- Unlock Full Access$2.99
Questions
Is Synthesis24 free?
Is Spelling Hero free?
Do Synthesis24 or Spelling Hero have ads?
Which is updated more often, Synthesis24 or Spelling Hero?
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