Stim Check
See when caffeine wears off
Free · Designed for iPad. Not verified for macOS.
Track your intake, see your caffeine curve, and find out when you’ll actually be clear for sleep. Free, no ads, no sign-up.
You’re probably still caffeinated.
PreFix: Stim Check helps you track how much caffeine is still active in your system—and when you’ll actually come down.
Most people guess when caffeine wears off. This tool shows you.
Log your coffee, pre-workout, or energy drinks and visualize your caffeine levels over time based on your body weight and caffeine half-life.
See exactly when you drop below a sleep-safe threshold so you can better manage timing, performance, and recovery.
Features:
Log caffeine intake (coffee, pre-workout, energy drinks)
Visualize your caffeine curve throughout the day
See how much caffeine is still active in your system
Get a “clear by” time for when levels drop
Simple, fast, and easy to use
Built for lifters, athletes, and anyone trying to better understand their caffeine habits.
Free. No ads. No signup.
This app provides estimates based on average caffeine metabolism and is not medical advice.
-Tap a consumption row to edit. When no row is swiped open, tap an entry to open the edit sheet (same as the swipe “Edit” action). Swipe-to-dismiss and other taps are unchanged.
-Serving size in fl oz or mL. Choose your preferred unit in Settings; the caffeine product list and catalog serving fields use it. Doses still scale from each product’s reference serving.
-Expanded product catalog. More drinks in the database, with listed volumes including milliliters where applicable.
-Custom entry icon. Added the flex emoji option for custom logs.
The developer, Edward Nepomuceno, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Edward Nepomuceno
- Size
- 29 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- Copyright
- © 2026 PreFix. All rights reserved.