Crazy Human Lab.
An independent software lab in Tokyo. We run small, strange experiments on the human condition — sleep, pressure, caffeine, habit, play — and ship the results as apps, APIs and tools.
人間という不可解な生き物を、自分自身を被験者にして観察し、 その結果をソフトウェアとして世に出す小さな実験室です。
Working hypothesis
仮説-
H1
Humans are strange. We measure them anyway.
Sleep debt, air pressure, a third coffee, one drink too many. The body keeps a ledger whether you read it or not. We build the instruments that let you read it.
-
H2
Every product starts at N = 1.
The first subject of every experiment is the person who built it. If it doesn't survive a month of our own daily use, it doesn't ship.
-
H3
Small, calm, and slightly unhinged.
Quiet interfaces, no dark patterns, no engagement farming. But the ideas themselves are allowed to be a little crazy. That's the point of a lab.
Experiment log
実験記録Every specimen is a shipped product. Grouped by division, ordered by release. Most run on iPhone and Apple Watch; some live on the web.
Body
Trackers for the physical machine.
- A-01Sleep LedgerKnow your sleep debt
- A-02BaroPulseBarometric pressure & migraine tracker
- A-03SoberdayAlcohol & sleep body-data tracker
- A-04CleardayCaffeine & sleep tracker
- A-05StrideMapStep count visualization
- A-06QuietMilesYear-over-year activity comparison
Mind
Instruments for thoughts, dreams and attention.
- B-01ReframePrivate AI CBT journal
- B-02Still OneMinimal daily reflection
- B-03Still DotA quiet field for your thoughts
- B-04ThoughtRunRecord ideas while running
- B-05AwakeLoomCapture your first morning thoughts
- B-06DreamLooomTurn dreams into art
- B-07One Minute ExplainFeynman-technique study timer
- B-08MemoryGlowGentle reading light with memories
Play
Games, some of them powered by your own body data.
- C-01Daybound TowerHealth-driven tower-climbing RPG
- C-02Slumber DriftSleep-powered voyage game
- C-03PuzzleLoomSudoku with smart hints
- C-04StillfallMinimalist pressure strategy
- C-05Quiet CirclesCalm educational tap game
- C-06Lab Gone WrongLab idle game. Yes, really.
- C-07DepthDriftExploration idle game
- C-08おじいちゃんといぬHeartwarming idle game
Family
Small tools for small humans.
- D-01ChoresLogsManage allowance through chores
- D-02Today's Todo for KidsDaily task management
- D-03MyBiasLifeK-pop fan activity tracker
Infrastructure
APIs, libraries and tools for other builders.
- E-01JPOSTCODE APIJapanese postal code lookup API
- E-02saml_idp_metadataSAML IdP metadata parser (Ruby)
- E-03ehproxySimple HTTP proxy server
Full catalog with store links → tknzk.app
Method
手法- 01
Notice
Something about being human is annoying, opaque or unmeasured.
- 02
Build
The smallest instrument that could possibly answer the question.
- 03
Self-test
Wear it. Use it daily. Be the first, and worst, subject.
- 04
Ship
Release quickly, price fairly, respect the data. No dark patterns.
- 05
Observe
Listen, iterate, or retire it. Then back to step one.
The lab
研究室tknzk
Takumi Kanzaki
Software engineer and indie hacker. Builds the instruments, runs the trials on himself, writes it up in public.
- Founded
- 2026, Tokyo
- Form
- Independent, self-funded
- Platforms
- iOS, watchOS, Web, Cloudflare Workers
- Stack
- Swift, SwiftUI, Ruby, TypeScript
- Ethics
- On-device by default. No ad trackers. No dark patterns.
Contact
連絡先Collaboration, press, or a hypothesis you want tested.
info@crazyhumanlab.comReplies from a human. Usually within a few days.