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Stim Check

Stim Check

See when caffeine wears off

5 ratings
4 reviews
💪 Health & Fitness
Free

Details

  • Released
  • Updated
  • April 16, 2026
  • April 27, 2026

Features

Developer

Edward Nepomuceno
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Stim Check screenshot #1 for iPhone
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Stim Check screenshot #5 for iPhone
iphone
ipad
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Reviews↘︎
❓8 answered
FAQ↘︎
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About

Track your caffeine intake and visualize how it affects your system over time. This tool helps you understand when caffeine will wear off, allowing for better management of sleep, performance, and recovery.

✓Log caffeine intake from various sources
✓Visualize caffeine levels over time
✓Estimate caffeine half-life
✓Determine 'clear by' time for sleep safety
✓Simple and fast user interface
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What's New in Stim Check

1.0.1

April 27, 2026

-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.

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User reviews

Most RecentHighest RatedLowest Rated

Great app for tracking caffeine

I have trouble sleeping especially when I have had too much caffeine. I’m glad that I can actually see where my caffeine level is during the day. It’s actually pretty accurate! Very easy to input which drinks I’ve had, so I find that very useful. Awesome app!
rps85rps85

Helps me manage my caffeine intake

Stim Check made me aware of just how much caffeine I was consuming from my morning coffee and helped me reduce the heart palpitations I was getting from over-consumption. I used to drink a coffee at 4pm, but now I switched to matcha and drink it before noon. I haven’t had a problem since. Great app!
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Jenijenny123Jenijenny123

Must-Have App for Tracking Caffeine’s Impact on Sleep

I usually train late and need pre-workout to get through training sessions. This app helps me understand the effects of pre-workout vs sleep and dumbs it down so I know when it is best to have caffeine while still optimizing sleep. The app is very simple and user friendly.
WombatFoolWombatFool

Actually useful for timing caffeine

Built this because I kept guessing when caffeine would wear off and I was usually wrong. This makes it really easy to log what you take and see how long it’s still in your system.

The “sleep-safe” time has been the most useful part for me, especially for avoiding late doses. Still early and improving, but would love feedback from anyone who tries it.
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Shreddy The NepShreddy The Nep

FAQ

What is Stim Check?

Stim Check is a health and fitness app designed to help you track your caffeine intake. It visualizes your caffeine levels over time and estimates when they will drop below a sleep-safe threshold.

How does Stim Check calculate caffeine wear-off?

Stim Check uses your body weight and the average caffeine half-life to estimate how long caffeine remains active in your system. It provides a 'clear by' time for when your levels are expected to drop.

What types of caffeine intake can I log in Stim Check?

You can log caffeine intake from common sources such as coffee, pre-workout supplements, and energy drinks. The app allows you to input these to track their impact on your system.

Is Stim Check free to use?

Yes, Stim Check is completely free to download and use. It does not require any signup, and there are no advertisements or in-app purchases.

Does Stim Check have ads?

No, Stim Check is ad-free. The app was developed with a focus on user experience and does not display any advertisements.

What devices is Stim Check available on?

Stim Check is available on iPhone and iPad devices. It is designed to run on iOS platforms.

How often is Stim Check updated?

The latest version of Stim Check is 1.0.1, which was last updated on April 27, 2026. Updates typically address performance improvements and bug fixes.

Is Stim Check suitable for children?

Stim Check has an age rating of 4+, making it suitable for a wide range of users. However, its functionality is most relevant for adults managing caffeine intake.