CK-IN
Fitness Tracking & Community
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Free
About
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
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What's New in CK
1.1
January 21, 2026
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.
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