Anzan19x19 vs GreenScore!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Anzan19x19
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Method of mental calculation of 19x19 Provides a completely new mental method of multiplication from 11 to 19 This method can be understood in a few minutes and can be calculated on the fly.Provides a new mental calculation method of multiplication from 11 to 19.
GreenScore!
This app helps you live more sustainably by tracking eco-friendly actions and their impact on CO₂ reduction. Earn points, set goals, and compete with friends to build lasting green habits.
- Log eco-friendly actions
- Track CO₂ savings
- Set daily goals
- Compete with friends
- Progress tracking
- Social inspiration
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Turn daily actions into climate impact. GreenScore! makes sustainable living simple and social. Track eco-friendly choices, earn points for reducing CO₂, and compete with friends to build green habits that stick. What you can do: - Log actions across energy, transport, food & more - See your real CO₂ savings with every choice - Set daily goals and build lasting streaks - Connect with friends and inspire each other - Track progress from Eco Beginner to Eco Master Small actions, big impact. Join us in making sustainability a daily habit.
Screenshots
Verdict
The clearest difference is ads: GreenScore! at none against Anzan19x19's shown. Anzan19x19's advantage is update cadence (every 3 days vs every 3 months) and iOS requirement (12.0 vs 15.1). On price, 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. Neither carries in-app purchases, so what you see is what you pay.
Anzan19x19 ships an update every 3 days, GreenScore! every 3 months. The most recent releases landed on November 7, 2026 and October 30, 2026 respectively.
| Parameter | Anzan19x19 | GreenScore! |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (10 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 10 — better |
| Update frequency | Every 3 days — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 38 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Hajime Hotaka | CS For Climate |
In-app purchases
Anzan19x19
No in-app purchases
GreenScore!
No in-app purchases
