# ゼロカーボン・チャレンジ vs Takamaru

The clearest difference is in-app purchases: ゼロカーボン・チャレンジ at none against Takamaru's 2. ゼロカーボン・チャレンジ also leads on iOS requirement (15.6 vs 18.6). Takamaru's advantage is update cadence (every 4 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Takamaru sells 2 one-off in-app purchases. ゼロカーボン・チャレンジ asks for nothing beyond the download.

ゼロカーボン・チャレンジ ships an update monthly, Takamaru every 4 days. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | ゼロカーボン・チャレンジ | Takamaru |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/id6475059135/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 29 MB | 16 MB |
| Requires iOS | **15.6** | 18.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [JAPAN ZERO CARBON SMART CITY FOUNDATION, GENERAL INC. ASSOCIATION - AXFG5J98TW](https://appshunter.io/developer/1723265776) | [Daniel Kirstenpfad](https://appshunter.io/developer/717539392) |

## What reviewers say

### ゼロカーボン・チャレンジ

[App page](https://appshunter.io/ios/app/id6475059135)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Takamaru

[App page](https://appshunter.io/ios/app/takamaru/id6758580687)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Individual Lifetime | $1.99 | one-time |
| Family Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is ゼロカーボン・チャレンジ free?

ゼロカーボン・チャレンジ is free to download, with no in-app purchases.

### Is Takamaru free?

Takamaru is free to download, with in-app purchases available.

### Do ゼロカーボン・チャレンジ or Takamaru have ads?

Neither ゼロカーボン・チャレンジ nor Takamaru shows ads.

### Which is updated more often, ゼロカーボン・チャレンジ or Takamaru?

ゼロカーボン・チャレンジ ships an update monthly, and Takamaru every 4 days. Most recently, ゼロカーボン・チャレンジ was updated on November 4, 2026 and Takamaru on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*