# Challenge Log - チャレンジログ - — Stamp your small daily wins.

> Stamp your small daily wins. (iPhone/iPad app by YOSHIKI KOKUBO.)

- Source: https://appshunter.io/ios/app/challenge-log/id6748856273 (this page in markdown: same URL + `.md`)
- Developer: [YOSHIKI KOKUBO](https://appshunter.io/developer/1496137532)
- Category: Lifestyle, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 89 MB
- Languages: American English, Dutch, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, European Portuguese, Chinese (Simplified, China) and 4 more
- Released: 2025-07-22
- Data updated: 2026-08-22
- User reviews in markdown: https://appshunter.io/ios/app/challenge-log/id6748856273/reviews.md

## What is Challenge Log?

Small wins, every day.

Challenge Log is a gentle stamp-based app for recording your daily study, work, and habits. With this major rebrand, both the look and the feel have been reborn.

[Key Features]

New Type x 3-Grade Stamps: Combine 6 types (Face, Hand, Aco, Hanamaru, Star, Flower) with 3 grades (Great, Good, A Little). You'll always find the right stamp for the day.

Warm & Cool Themes: Switch between the warm-toned "Warm" and cool-toned "Cool" palettes to match your mood or the season.

Simpler 3-Tab Home: Home / Timer / My Page — a cleaner flow. Tap any date on the calendar to open the record sheet directly.

Inline Monthly Summary: Stamp and timer breakdowns are always visible on the Home screen.

Onboarding for First-Timers: A five-page intro tour on first launch. Press a stamp yourself and get a feel for the app right away.

Easy Login: Quick sign-in with Google or Apple. No tedious registration required.

Record Without Sign-In: Save records locally without an account. Link to an account later to sync to the cloud.

Larger Calendar Stamps: Each day's stamp is displayed larger, so your month's progress is easy to see at a glance.

Timer Function: Set a time and focus. The screen stays on while running, with a reset confirmation dialog for peace of mind.

Reminder Notifications: Set daily, weekly, monthly, or custom-interval reminders. Manage them all from Notifications on My Page.

Calendar Sharing: Share challenges with friends and cheer each other on.

Rename Your Stamps: Customize stamp-type names to make them your own.

Reorder Your Stamps: Rearrange stamp types from Settings and put your favorites right up front.

Profile Setup: Set a username and avatar to personalize your experience.

No Goals, No Penalties: No quotas, no deadlines. Focus on just showing up.

Daily Memos: Freely jot down notes, insights, or how you feel.

App Notices: Timely updates on app news and consistency tips.

Cloud Backup: Sign up to save records securely in the cloud. Migration between devices is easy.

Multi-language: available in 15 languages — Japanese, English, Korean, Simplified Chinese, Traditional Chinese, German, French, Spanish, Portuguese (Brazil and Portugal), Italian, Dutch, Indonesian, Vietnamese and Thai.

[Recommended if you...]

- Want to quit being a "quitter"
- Want a gentle-looking app you'll actually want to open
- Want to build habits with friends
- Dislike strict goal management or penalties
- Want to try the app first without signing in
- Want a theme you can switch by mood

Start today — capture your "I did it" days with your favorite stamps.


## Version history (last 5 releases)

### 2.1.0 — 2026-08-20

Challenge Log now speaks 15 languages.

• Added German, French, Spanish, Portuguese, Italian, Dutch, Indonesian, Vietnamese, Thai and Traditional Chinese
• The app now follows your device language automatically
• App name, notifications and error messages are localised too
• You can now pick "System default" in Settings

### 2.0.3 — 2026-08-14

New

• A first-launch onboarding tour. Welcome, Record, Look Back, Focus and Get Started — five pages that walk you through Challenge Log, with a stamp you can actually press along the way.

Fixed

• On the record sheet, the stamp type selected by default no longer ignores the order you chose when reordering stamp types.

### 2.0.2 — 2026-07-25

New

• Reorder stamp types on the record sheet. Go to Settings > Records > Reorder Stamps and drag your stamp types into any order you like — put your most-used type first for an even smoother daily record.

Improved

• Brand-new app icon and splash screen. Enjoy a cheerful new stamp-mark icon paired with a soft, sky-inspired color palette.

### 2.0.1 — 2026-07-12

[New Features]
• A major redesign! New icon, new splash, and a new display name — welcome to Challenge Log.
• Stamps have been rebuilt as "Type x 3 Grades." Combine 6 types (Face, Hand, Aco, Hanamaru, Star, Flower) with 3 grades (Great, Good, A Little) freely.
• Switch between two themes: "Warm" and "Cool" to match your mood.
• Save records locally without signing in. Sync to the cloud later whenever you like.

[Improvements]
• Simpler navigation with 3 tabs (Home / Timer / My Page).
• "This Month's Summary" is now inlined on Home so stamp and timer breakdowns are visible at a glance.
• Larger stamps on the calendar for better visibility.
• Timer screen colors refreshed to match the new brand.
• App-wide copy rewritten in a softer, gentler tone.

[Bug Fixes]
• Improved sign-in reliability and fixed rare authentication issues.

### 1.4.3 — 2026-05-25

[Improvements]
• When you switch stamp sets, the first stamp (mood) is now selected automatically for smoother logging.

[Bug Fixes]
• Fixed an issue where saving without choosing a stamp left nothing on your calendar. A stamp is now required before saving.
• Improved the reliability of saving your records right after the app launches.
• Fixed a rare issue during sign-in and sign-up to improve stability.

## Apps similar to Challenge Log

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [目標達成くん](https://appshunter.io/ios/app/id6443497799) | 5.0 (1) | Free | Lifestyle |
| [推しスケ](https://appshunter.io/ios/app/id1573710956) | — | Free | Lifestyle |
| [The 36 Questions: Lead to Love](https://appshunter.io/ios/app/the-36-questions-lead-to-love/id1541439969) | 4.6 (19) | Free | Lifestyle |
| [QuiTimer](https://appshunter.io/ios/app/quitimer/id1594048827) | 4.9 (16) | Free | Lifestyle |
| [デカモジ](https://appshunter.io/ios/app/id6752944534) | — | Free | Lifestyle |
| [Home c8r - 家事と家計の分担アプリ](https://appshunter.io/ios/app/home-c8r/id1514605644) | — | Free | Lifestyle |

## More apps by YOSHIKI KOKUBO

- [スキップインターバルタイマー](https://appshunter.io/ios/app/id1496137533)
- [Cool104jw](https://appshunter.io/ios/app/cool104jw/id1511443786)
- [買い物リストNOW](https://appshunter.io/ios/app/now/id1512902907)
- [Rakutoon](https://appshunter.io/ios/app/rakutoon/id6757268309)

All apps by YOSHIKI KOKUBO: https://appshunter.io/developer/1496137532

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-22.*