# DebuffTimer - Sleep by Fear — Skip sleep, and I fall apart.

> Skip sleep, and I fall apart. (iPhone/iPad app by kizuku nishimoto.)

- Source: https://appshunter.io/ios/app/debufftimer-sleep-by-fear/id6791829009 (this page in markdown: same URL + `.md`)
- Developer: [kizuku nishimoto](https://appshunter.io/developer/1882009144)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 18.0 · 19 MB
- Languages: American English, Japanese
- Released: 2026-08-14
- Data updated: 2026-09-09
- User reviews in markdown: https://appshunter.io/ios/app/debufftimer-sleep-by-fear/id6791829009/reviews.md

## What is DebuffTimer?

I'm Yoi. Your brain's avatar.

How long have you been awake?

If you can't answer right away, you're probably already slipping. A sleep-deprived brain performs like a drunk one — after 17 hours awake, cognitive tests drop to tipsy levels; at 24 hours, reaction time matches someone well over the limit. That's not a scare tactic — it's a measured finding from occupational medicine research. The nasty part? You're the only one who can't tell. Studies have shown that "I'm fine without sleep" is the least reliable self-report there is.

So I'll break down in your place.

The longer you stay up, the more I turn yellow, then red, then cracked and lifeless. That progression is your "Debuff Score" (0–150). Think of it as your brain's status screen in a game — a real-time number and gauge showing how wrecked you really are.

WHAT YOU CAN DO
- Real-time Debuff Score with a BAC (blood-alcohol) equivalent
- HP, Focus, and Judgment gauges plus status-ailment labels
- Second-by-second countdown to tonight's bedtime limit
- Aggressive nudges at night; just the facts in the morning (no lectures when it's too late to change anything)
- Log sleep with a single "Sleep" / "Woke up" tap — and backfill missed days with "Around here?"
- Optional auto-import from Apple Health (HealthKit)
- Weekly wake-up schedule with per-day overrides for shift workers
- Auto-shield games and social media at bedtime (Screen Time) with optional Strict Shield
- Bedtime-rhythm scatter chart and 30-day trend graph
- 5-axis Sleep Score (Duration / Continuity / Regularity / Timing / Architecture)
- No penalty for skipped days — streaks count "days logged this month," not consecutive runs

FREE VS PRO
Everything that gets you to bed is free. Debuff Score, notifications, schedule, shield (including Strict Shield), sleep log, last 7 days of data, and overall Sleep Score — no paywall. Pro (one-time purchase) adds 5-axis score breakdown, stage timeline, biometrics (heart rate / HRV / respiratory rate), unlimited daily detail history, month-over-month comparison, trend analysis, custom notification wording, and shift patterns. Nice-to-haves, not need-to-haves.

ONE HONEST NOTE
I'm not a medical device and I can't diagnose anything. The Debuff Score is a research-based estimate, not a clinical reading. Also, I'm bad at waking you up — use the built-in alarm for mornings.

My job ends when you're in bed. Let's start tonight.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| DebuffTimer Pro | $1.99 | one-time |



## Version history (last 5 releases)

### 1.0.5 — 2026-09-09

Small fixes.
- Free days with no sleep logged no longer count as time spent awake, so your debuff no longer keeps climbing across an unlogged weekend

### 1.0.4 — 2026-09-03

Small fixes.
- The morning notification now makes clear its score is about last night's sleep, not the debuff value on the status screen

### 1.0.3 — 2026-08-26

Shield touch-ups.
- The shield screen now shows the time it lifts on its own, so being locked out has a visible end
- The app picker now warns that shielding DebuffTimer itself locks you out of these settings
- Fixed the debuff value on the Lock Screen staying off after you wake up
- Fixed the Lock Screen display vanishing or holding a stale value
- Fixed the lift time drifting by an hour on daylight saving nights
- History now shows 30 entries at a time, so a long history stays light

### 1.0.2 — 2026-08-21

Small fixes.
- While past your limit, the duplicated duration is now the sleep you'd still get if you went to bed now
- The shield screen now says why the extend button isn't available

### 1.0.1 — 2026-08-19

A readability pass.
- Cleaned up text colors in Settings — red is now reserved for what's actually risky
- Darker colors in light mode for better legibility
- "Getting your sleep data in" is now reachable before you connect Health
- Links that leave the app are marked as such
- Fixed the goal line label hiding behind the bars in the 30-day chart

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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 2026-09-09.*