Find your sleep rhythm
Aurnia
Track your sleep. Discover your recovery rhythm.
Discover a little
more of you.
Fortune, personality, connections and a little play.
See today’s fortuneSmall moments, fresh discoveries
Explore moreCloser to everyday life. 46 apps
Health, mindfulness, learning, tools and games. Find what fits your day.
A moment for yourself
Onnal
One line a day. A little space for you.
A new reason to wander
Plotta
Turn your daily walk into your own territory.
NameShop
AI naming for people and brands
Zone 2 Longevity Coach
AI-powered Zone 2 training coach
PulseCalm
HRV-based stress recovery guide
Aurnia
AI sleep coach + smart alarm + recovery score
Sage
AI tracker for menopause symptoms
Cyra
AI tracker for PCOS and irregular cycles
PeriTrack Pro
Symptom tracking and pattern insights for perimenopause
GutLog AI
Track meals, spot gut triggers
Throne
A private gut-health tracker for stool, symptoms, and food
Culprit
Pattern-finder for dietary triggers
MoodBite
AI tracker for food–mood patterns
Flara
Skin reactions, food, weather, and products with AI trigger analysis
Repvy
RPE-aware AI strength coach with autoregulation
Aftershift
Recovery routines that reset your rhythm after every shift
Innra
AI journaling with emotional pattern insights
Solca
Social battery tracker built for introverts
Paxio
AI coach for your relationship with money
Resolv
A tracker that helps you quit the habit for good
Onnal
A quiet one-line-a-day journal
Biasly Pro
Living Korean, learned through K-pop
Chunja
Learn classical Chinese characters through the Thousand Character Classic
Purro
Pick her voice, talk English — first 10 minutes free
Expra
AI receipt OCR + auto-categorization + tax-prep helper
HQLens
S&P 500 headquarters and SEC data on one screen
Slimroll
On-device cleaner for duplicate and blurry photos
Petport
International pet travel deadline checklist
Pawport
Instantly tells you if a cheaper hotel rate appears after booking
HiddenGem Korea
Korea's hidden travel spots, surfaced from public data
RoadEye Pro
Preview the road ahead with live traffic CCTV
Reelo
An AI video editor for captions and effortless cuts
Brewra
A quiet pour-over timer that guides every pour
FreshSave
Food freshness tracker & recipe recommender
Streaklet
A quiet habit tracker for small daily routines
Nomori
A calm nonogram with a new picture every day
Pixogue
A minimal daily pixel nonogram (picross)
Clearfield
A quieter take on classic Minesweeper
Jiyul
A calm daily puzzle for one player
K-Pop Heardle
A daily K-pop song guessing game
Stelo
A private night sky that fills itself, one star a day
Gravity Duel
An arcade space battle of gravity, timing, and orbital shots
Territory Arcade
Carve neon territory across 100 hand-crafted stages
Plotta
Turn your daily walks into a territory game on the real map
Horangi
Speak Korean out loud with a folk-art tiger
Itda
Chain Korean words and learn by playing
Quieta
A tinnitus journal that surfaces patterns
Maneki
Speak Japanese out loud with a lucky cat
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Find your next discovery
34 little tools and games, all free to use. Results are for fun and reference.
Today's FortuneA fresh daily reading of luck, tarot and fortune from your birth date.
Saju DuoAI saju five-element compatibility from two people's birth dates and times.
Tarot DictionaryAll 78 cards' upright and reversed meanings plus an AI 3-card reading.
Shaman Kim's ReadingShaman Kim Bok-nam reads your story with an AI spirit reading.
My ZodiacYour star sign: personality, love & matches.
Chinese ZodiacZodiac animal personality & match by year.
My Ilju (Saju)Your saju day pillar from your birth date.
Your Birth DateZodiac, Chinese zodiac, saju, biorhythm & life in weeks — all from your birth date.
Personality · Psychology · Relationships
MBTI Match DictionaryCompatibility scores for all 136 MBTI pairings, laid out in one place.
Attachment Style TestFind out your attachment style when it comes to love.
Chemi CheckPaste two people's chat and let AI analyze the chemistry.
Personal ColorFind your personal color in a minute with 6 questions, no photo needed.
Mental Age TestYour mental age from 15 quick questions.
Blood Type PersonalityA/B/O/AB personality & compatibility.
Name LabAI reads the sound, hanja meaning and energy of your name.
Baby & Womb Name BookAI suggests 5 lovely baby names and womb names.
Brand Naming ShopAI names your store, brand or company, with trademark tips.
Seimei Handan (姓名判断)Japanese-style name reading that scores a name by its stroke counts.
Salary LabA calculator for your take-home pay and your income percentile.
Loan CalculatorMonthly payment & total interest, instantly.
Gift Money CalculatorWorks out the right cash gift for a wedding based on your relationship.
Quit-Your-Job IndexHow high is your urge to quit? Take the diagnostic test.
The Money SchoolmasterA reborn old master scolds your spending habits and lectures on saving.
Guides that make it more fun
Where do the results come from? We explain the ideas behind each tool in plain language.
Saju
Saju basics: understanding the five elements and ten gods
Heavenly stems and earthly branches, the cycles of the five elements, and what the ten gods mean — from the ground up.
CompatibilityHow saju love compatibility is read
The logic of reading two people's match through the harmony, clashes and combinations of the five elements.
TarotAll 78 tarot cards and their meanings
The 22 Major and 56 Minor Arcana, upright and reversed, at a glance.
MBTIUnderstanding the 16 MBTI types and their matches
The four dimensions, each type's traits, and which pairings click and why.
NamingHow Korean names and womb names are chosen
Sound, hanja meaning, yin-yang and five elements, stroke counts — the criteria behind a name.
Personal ColorPersonal color: a four-season self-check
The traits of spring, summer, autumn and winter types and how to pick colors that suit you.
DreamsCommon dreams, read through their symbols
Interpreting frequent dream symbols like money, water, teeth and death.
PsychologyAttachment styles: secure, anxious and avoidant
Attachment theory, made simple, to explain how you react in love.
What is ootssu?
ootssu is a collection of web tools that lightly answer your curiosity about yourself. From the age-old Eastern study of myeongni, such as saju and compatibility, to modern psychology like MBTI and attachment styles, and on to personal color, naming and dream reading — AI turns topics that used to be long and hard to explain into short, easy-to-follow results. Every tool runs right in your browser, free, with nothing to install.
Curious about "why" a tool gives the result it does? Read the guides alongside it. We explain the ideas behind the results in plain language — what the five elements of saju are, what tarot cards mean, why MBTI matches turn out the way they do, and more.
Please note
All ootssu tools and guides are content for fun and reference. Fortune, compatibility, past lives and the like are for entertainment and do not replace professional judgment in medicine, law, finance or psychological therapy.
Build notes from the maker
Field notes from building ootssu solo — failures and numbers, unedited.
Revenue
I shipped 42 apps in 113 days. Total revenue: $69.82
42 iOS apps and 2 Android apps in 113 days. Across both stores, every charge that ever landed adds up to 14 transactions and $69.82. Full ledger included.
AI agentsHow I run Claude Code and Codex together to ship dozens of apps
Claude orchestrates (plan, verify, deploy), Codex generates (design, content). The handoff is a manifest, and the whole thing lives or dies on verification gates.
Solo devMy one-person agent factory: the setup
34 web apps, a handful of paper-trading bots, and a multilingual video pipeline — all from a 2017 Intel laptop that just stays on. And why the old hardware helped.
AutomationA pipeline that auto-generates YouTube Shorts — edge-tts + ffmpeg, zero paid tools
Turning a text script into a finished vertical video, no paid APIs and no manual editing. Plus the honest part — why production was never the bottleneck.
AI agentsI ran a 100+ agent research swarm — its most useful answer was ‘no’
Fan-out research with adversarial verification: many search agents, then a 3-vote refutation gate. Pointed at YouTube automation, it killed most claims I wanted to believe.
PromptsMy 3 high-end UI prompts in full — and only half of their rules survived
The full text of the prompts I use to generate iOS, Android, and game UI. Then I grepped the shipped code: three rules survived, three were quietly ignored.
PromptsOne line — ‘analyze from first principles’ — breaks dashboard self-deception
A prompt that costs nothing stripped two rounds of self-deception in one week: a traffic dashboard and a self-improvement gate. It's a forcing function, not a clever trick.
Reality checkWhy ‘MoneyPrinter’ YouTube automation is mostly hype
MoneyPrinterTurbo and OpenMontage are real, popular open-source projects. But the name oversells them — they automate production, and production was never the bottleneck.
Traffic63% of my app traffic came from the channel I wasn't investing in
Six months poured into YouTube Shorts. When I finally measured app traffic by source, YouTube was 13% and Threads — barely touched — was 63%.
Traffic48 apps, 8 clicks a month — a portfolio traffic autopsy
2,735 impressions is vanity; the real traffic was 8 clicks. The bottleneck wasn't app count or on-page tuning — it was one thing: domain authority.
FAQ
What is ootssu?
ootssu is a free collection of web tools that answer your curiosity about yourself — saju, compatibility, MBTI, personal color, naming, dream meanings and more — in short, fun results.
Are the tools free?
Yes. Every tool runs right in your browser with no install or sign-up, completely free.
What tools are there?
Daily fortune, tarot, saju compatibility, MBTI match, attachment style, personal color, naming, dream dictionary, calculators and more — over 33 tools.
Are the results reliable?
All tools and guides are for fun and reference only, and do not replace professional medical, legal, financial, or psychological advice.