# Kidou: Grow a Solar System — Habits become a living cosmos

> Habits become a living cosmos (iPhone/iPad app by kazunari aoki.)

- Source: https://appshunter.io/ios/app/kidou-grow-a-solar-system/id6790350656 (this page in markdown: same URL + `.md`)
- Developer: [kazunari aoki](https://appshunter.io/developer/6774180811)
- Category: Lifestyle, Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English, Japanese
- Released: 2026-07-15
- Data updated: 2026-08-26
- User reviews in markdown: https://appshunter.io/ios/app/kidou-grow-a-solar-system/id6790350656/reviews.md

## What is Kidou?

Your habits find their orbit — grown the way real planets are.

Kidou turns your habits into a living, hand-grown solar system. Open it and you don't find a dashboard — you find a night sky. The more you show up, the more it grows: worlds are born, drift into orbit, and slowly come to life.

■ Grown the way real planets are
Every habit is a celestial body. Each day you keep it, you "turn an orbit," and the body visibly gains mass. As orbits add up, it accretes through the true stages of planet formation:
　Dust → Pebble → Planetesimal → Protoplanet → Planet
Big goals break down into the smallest possible step — start with "just get ready" — and every few days a stage completes, so growth is always something you can see.

■ You choose: advance or stay
Every stage-up is an invitation, never automatic. Move to the next stage, or stay here a little longer. Staying is never a penalty. If a stage feels heavy, you can always drift back to an inner orbit, and your record is never lost.

■ A star ignites at your center
When your first habit fully grows, the "you" at the center ignites into a star. Each new planet you form lets you evolve its color — amber, blue-white, pure white, violet, crimson, jade. Tap the star for an overview: worlds growing, worlds formed, total orbits, and an observation log of every milestone.

■ Never shaming, never nagging
No "failure." No "streak broken." No "missed." Pausing costs you nothing. A habit that lapses simply drifts away like a comet on a long orbit — and it always returns. No red warnings, no nagging notifications, no guilt badges.

■ Scatter your first dust in about 90 seconds
Pick from twelve templates or name your own goal, see its five-stage path, choose a color, and take the first step.

■ Home Screen widget
Mark today's orbit right from your Home Screen — a calm checklist, one step at a time, without even opening the app.

■ Entirely on your device
No account, no login, no cloud, no ads, no tracking. Your data stays on your device, with no network except Apple's purchase processing.

■ Pricing
Grow up to three habits for free. A single one-time Planetarium Pass removes the habit limit, so you can grow as many habits as you like. No subscription — you pay once. The price is shown in the app.

There is no rush. Your solar system grows by exactly as much as you showed up for today.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Planetarium Pass | $6.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-07-30

Your star now shines only while you keep going.
• After a day with nothing at all, the star quietly goes dark. Turn a single orbit and it lights again — the colors you've unlocked and your progress are never lost.
• The widget now rolls over to the new day on its own. Yesterday's checkmarks no longer stay on.
• Fixed: an orbit logged from the widget late at night could be counted on the following day.

### 1.0.0 — 2026-07-15

No release notes.

## More apps by kazunari aoki

- [人相診断AI - 16タイプ診断](https://appshunter.io/ios/app/ai-16/id6775012372)
- [StepScape: Walk Travel Widget](https://appshunter.io/ios/app/stepscape-walk-travel-widget/id6778904496)
- [Motta? Don't-Forget Checklist](https://appshunter.io/ios/app/motta-dont-forget-checklist/id6782049972)
- [Kokoro Compass](https://appshunter.io/ios/app/kokoro-compass/id6782552223)
- [RealRep](https://appshunter.io/ios/app/realrep/id6785042959)
- [Focus Meter: Study Timer](https://appshunter.io/ios/app/focus-meter-study-timer/id6785273117)

All apps by kazunari aoki: https://appshunter.io/developer/6774180811

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*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 2026-08-26.*