Rectangles & Primes vs D'ANGELO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rectangles & Primes
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Rectangle provides a fun and insightful maths experience for kids aged 6 to 12. They will improve their understanding of number factorization and prime numbers.
D'ANGELO
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D'ANGELO helps kids in grades 3–5 master missing-number math at home. Find n in equations like 7 + n = 12. When an answer misses, D'ANGELO coaches the exact mistake instead of only saying “Incorrect.” WHAT KIDS GET • Warm-up and Check-in practice at their own pace • An adaptive path that picks the next skill from real mistake patterns • Gentle hints, story problems, and optional voice-first reading • Fact fluency sprints and a skill library built for grades 3–5 • Personal weekly growth so progress feels visible BUILT FOR HOME • No classroom accounts or teacher mode required • Parent settings for language, appearance, voice, and hints • Progress stays on the device • On-device coaching when Apple Intelligence is available, with built-in tutor templates that always work D'ANGELO: Find n. Learn why. Grow every week.
Screenshots
Verdict
The clearest difference is update cadence: Rectangles & Primes at every 3 weeks against D'ANGELO's every 30 months. Rectangles & Primes also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Rectangles & Primes ships an update every 3 weeks, D'ANGELO every 30 months. The most recent releases landed on September 15, 2026 and September 16, 2026 respectively.
| Parameter | Rectangles & Primes | D'ANGELO |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 30 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Johannes Charra | SYNCRONHUB INTERNATIONAL LLC |
In-app purchases
Rectangles & Primes
No in-app purchases
D'ANGELO
No in-app purchases
Questions
Is Rectangles & Primes free?
Is D'ANGELO free?
Do Rectangles & Primes or D'ANGELO have ads?
Which is updated more often, Rectangles & Primes or D'ANGELO?
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