# CK-IN — Fitness Tracking & Community

> Fitness Tracking & Community (iPhone/iPad app by Johannes Duo.)

- Source: https://appshunter.io/ios/app/ck-in/id6756836121 (this page in markdown: same URL + `.md`)
- Developer: [Johannes Duo](https://appshunter.io/developer/1863145863)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 85 MB
- Languages: American English
- Released: 2026-01-17
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/ck-in/id6756836121/reviews.md

## What is CK?

CK-IN, Build Consistency. Stay Accountable. Don't Skip.

CK-IN is a daily fitness accountability app built to help you show up even on the days you don't feel like it. This isn't about perfect workouts, calorie counting, or complicated plans. CK-IN is about consistency, commitment, and people who notice when you don't show up.

By using this app, you agree to our Terms of Use: https://www.ck-in.co/terms.html and Privacy Policy: https://www.ck-in.co/privacy.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Monthly Subscription | $7.99 | per month |
| Premium Annual Subscription | $69.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Circle Premium Access | $2.99 | one-time |



## Version history (last 2 releases)

### 1.1 — 2026-01-21

What's New in Version 1.1

We’ve made critical improvements to help you stay consistent:

Timer Intelligence Update: Your workout timer now tracks precisely even when the app is in the background or your phone is locked. No more paused timers.
Smart Completion Alerts: You will now receive a "Workout Complete" notification exactly when your planned duration ends, so you know it’s time to check out—even if your phone is in your pocket.
Performance Improvements: Enhanced session stability and faster load times.
Stay consistent. Stay locked in.

### 1.0 — 2026-01-17

No release notes.

## Apps similar to CK

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mirrocle](https://appshunter.io/ios/app/mirrocle/id6763953678) | — | Free | Health & Fitness |
| [Spotter: AI Lift Coach](https://appshunter.io/ios/app/spotter-ai-lift-coach/id6771567381) | 5.0 (8) | Free | Health & Fitness |
| [CraveLab: Food Scanner & Coach](https://appshunter.io/ios/app/cravelab-food-scanner-and-coach/id6760598704) | 5.0 (3) | Free | Health & Fitness |
| [TicuraAi](https://appshunter.io/ios/app/ticuraai/id6756805528) | 5.0 (2) | Free | Health & Fitness |
| [Luvra AI - Skincare Advisor](https://appshunter.io/ios/app/luvra-ai-skincare-advisor/id6754261779) | 5.0 (1) | Free | Health & Fitness |
| [Shimmer: Period & Hormones](https://appshunter.io/ios/app/shimmer-period-and-hormones/id6755983183) | — | Free | Health & Fitness |

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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 2026-09-14.*