Comparison

ゼロカーボン・チャレンジ vs Takamaru

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ゼロカーボン・チャレンジ

Features
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2025年4月~10月まで開催された大阪・関西万博を“きっかけ”に、個人の脱炭素行動を促すことを目的とした後継アプリです。万博のレガシーを引継ぎ個人のライフスタイルの転換を目指していきます。ひとりひとりが楽しみながら脱炭素な行動をすることでポイントが貯まり、そのポイントを利用することで景品の抽選に応募できます。 ちょっとした脱炭素行動を日常にプラスしてポイントを獲得し、貯めたポイントで景品抽選に参加しませんか? ~ゼロカーボンチャレンジアプリで日常生活に脱炭素とワクワクを~ 【ゼロカーボンチャレンジアプリに取り組むことでポイントをゲット】 アプリ内に設定されている「マイボトル」や「家庭系廃食用油の回収」等のチャレンジに取り組むことで、ポイントがゲットできます。 【貯めたポイントで景品抽選に参加】 チャレンジを実施して貯めたポイントで、景品抽選に参加することができます。

About

Takamaru

Features
Read full description

Takamaru is more than a countdown. It is a calm space to move toward something that matters. Choose a date. Add a title. Select an image that represents what you are waiting for. From that moment on, each day reveals one small piece of your image. One day. One piece. Behind a clean, structured grid lies your chosen picture. As time passes, the grid slowly opens. What was hidden becomes visible — step by step. Takamaru is built on a simple idea: Anticipation grows. Instead of watching numbers drop to zero, you experience progress visually. Each day brings you closer. Each day reveals a little more. Features: - Countdown to one meaningful date - Custom title and personal image - Daily image reveal through a minimal grid - Remaining days at a glance - Home and Lock Screen widgets - Apple Watch app with complications - Optional daily reminders Each grid cell represents one calendar day. The logic remains stable across time zones and daylight saving changes. If you skip a few days, the app catches up automatically. Takamaru is calm. It does not rush you. It lets anticipation rise — day by day. Takamaru – Waiting that grows.

Screenshots

ゼロカーボン・チャレンジ3 screens
Takamaru4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 6 level
ゼロカーボン・チャレンジ versus Takamaru: the parameters behind the verdict, then further details
Parameterゼロカーボン・チャレンジTakamaru
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings1 — better—
Update frequencyMonthlyEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better18.6
Further details — not scored
Size29 MB16 MB
Age rating12+4+
DeveloperJAPAN ZERO CARBON SMART CITY FOUNDATION, GENERAL INC. ASSOCIATION - AXFG5J98TWDaniel Kirstenpfad

In-app purchases

None

ゼロカーボン・チャレンジ

No in-app purchases

2 purchases

Takamaru

One-time2
  • Individual Lifetime$1.99
  • Family Lifetime$3.99

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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