DebuffTimer Downloads & RevenueDebuffTimer - Sleep by Fear · App Store
Not in any tracked top chart right now.
Updated 11 Nov 2026 · rankings refresh through the day
Developerkizuku nishimoto
CategoryHealth & Fitness
PriceFree
Released
Rating★ 5.0 (4)
Version1.0.9
Age rating12+
First seen by us
12 Nov 2026
12 Nov 2026DebuffTimer - Sleep by Fear update history & changes
Last change · 3 events since 14 Aug 2026Full timeline ↓Full timeline · 3 events
- 🆕DebuffTimer - Sleep by Fear first spotted by AppInsiderJapan (found via developer)
- 📦DebuffTimer - Sleep by Fear version 1.0.9- Before bed, the app now predicts your debuff at wake-up. As your limit approaches you'll see "If you sleep now: XX / Sleep 1h later: XX", so you can see what one more hour tonight costs you in the morning
- Fixed going to bed later after a nap sometimes showing a lighter debuff the next morning… more - 🆕DebuffTimer - Sleep by Fear released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
4 ratings
Measured
DebuffTimer - Sleep by Fear on the App Store
App details
App ID
6791829009
Publisher
kizuku nishimoto
On the store since
Aug 2026
Under a year
Minimum OS
iOS 18.0+
iPhone XS and later
Devices
iPhone · iPad
Content rating
12+
1 content note below
Languages
2
EN JA
Size
20 MB
Also listed in
Lifestyle
Content notesInfrequent/Mild Alcohol, Tobacco, or Drug Use or References
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
4 ratings
Measured
Ratings
4
Measured
About DebuffTimer - Sleep by Fear
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.
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.
Latest updates
1.0.9
- Before bed, the app now predicts your debuff at wake-up. As your limit approaches you'll see "If you sleep now: XX / Sleep 1h later: XX", so you can see what one more hour tonight costs you in the morning
- Fixed going to bed later after a nap sometimes showing a lighter debuff the next morning
