# Onset - Caffeine Tracker

> Onset - Caffeine Tracker (iPhone/iPad app by Doodle Studio LLC.)

- Source: https://appshunter.io/ios/app/onset-caffeine-tracker/id6779038082 (this page in markdown: same URL + `.md`)
- Developer: [Doodle Studio LLC](https://appshunter.io/developer/1845007706)
- Category: Food & Drink, Health & Fitness
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-06-15
- Data updated: 2026-08-09
- User reviews in markdown: https://appshunter.io/ios/app/onset-caffeine-tracker/id6779038082/reviews.md

## What is Onset?

Onset is a private caffeine timing tracker.

Log coffee, espresso, matcha, tea, energy drinks, cold brew, or custom caffeine, then see how much may still be active in your system and how much could carry into bedtime.

No account. No cloud. No ads. Your logs stay on your phone.

WHAT ONSET DOES

• Fast caffeine logging
Repeat a recent drink, pick a preset, or add custom caffeine in a few taps.

• Active caffeine estimates
Onset uses caffeine half-life math to estimate what may still be active after each log.

• Bedtime carryover
See an estimate of how much caffeine may still be active at your bedtime, so timing is easier to understand before the night gets away from you.

• Timing patterns
Review daily, weekly, monthly, and yearly views, including time-of-day patterns and top caffeine sources.

• Private by default
Onset is local-only. There is no account to create and no cloud sync to manage.

WHAT ONSET ISN’T

Onset is not a medical tracker, sleep diagnosis tool, or habit coach.
There are no streaks, goals, warnings, or moralizing.

It is a simple mirror for your caffeine timing: what you logged, what may still be active, and what patterns are showing up over time.

Built by one person. Feedback is welcome:
inder@doodlestudio.io


## Version history (last 3 releases)

### 1.1.1 — 2026-08-08

Onset now helps you connect caffeine timing with how you actually sleep.

• Check a drink before you have it and see how it changes your bedtime estimate.
• Optionally connect Apple Health sleep and rate how rested you feel. After 14 matched nights, Onset can show patterns from your own history.
• Find clearer Check a drink and Log a drink actions on Today.
• Enjoy more consistent type, easier-to-read screens, and native navigation.
• See Today update immediately after logging a drink.

Sleep analysis happens on your iPhone. Onset reads sleep data only when you choose to connect Apple Health, and it never writes to Health.

### 1.1.0 — 2026-08-06

Check a drink before you have it, set bedtime to the exact minute, and see what changed after you skip or log.

Today, Insights, and the bottom navigation have also been redesigned for quicker reading.

### 1.0 — 2026-06-16

No release notes.

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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 2026-08-09.*