01
Market intelligence
ProfitSearcher
Find products worth understanding.
A research workspace for discovering profitable software products, examining market signals, and turning scattered evidence into clearer product decisions.
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Independent software studio · Shanghai
Useful software,made with attention.
YunFanLabs builds focused tools for people who study, make, explore, and decide.
↓24public products
4product platforms10complete languagesEst. 2026 — YunFanLabs.com01 / Our operating idea
Make the useful thing clearer, calmer, and easier to keep.
We choose narrow problems with real repeat use. Each product should explain itself, respect the person using it, and remain useful when the network disappears.
02 / Selected products
A cross-section of research, reference, planning, and Apple Watch products.
02
Machinist calculator
Workshop Calc
Fast estimates for work that still gets verified.
An offline metal and machinist calculator for weight, units, fractions, tap drills, threads, materials, job records, and guarded export formats.
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03
Home noise investigation
Noise Detective Pro Home
Turn an annoying sound into a clearer record.
Record local samples, compare rooms or windows, inspect spectrum clues, and export reports for repair or property conversations—without uploading audio.
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04
Apple Watch companion
WatchCat Step Pet
A warmer reason to walk today.
Move a little, earn cat food, feed your cat, and watch its mood change. WatchCat turns daily steps into a small emotional loop on your wrist.
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05
Field reference
Wild Edibles Guide Offline
A careful field guide, even off-grid.
Browse more than 300 wild-edible entries offline, narrow candidates by traits, and compare identification details with explicit safety reminders.
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03 / Workshop tools
Free workshop calculators.
Try focused metal and machinist tools in your browser, then take the full workflow offline with Workshop Calc.
View all tools ↗FabricationMetal Weight CalculatorEstimate stock weight from geometry, length, quantity, and material density.MachiningBolt Circle CalculatorGenerate equally spaced hole coordinates from PCD, count, and start angle.MachiningChamfer & Countersink CalculatorCalculate ideal axial depth from two diameters and the included angle.ConversionUnit & Fraction ConverterConvert workshop units, decimals, fractional inches, and metric dimensions.GeometryRight Triangle CalculatorSolve the remaining sides and angles from two valid measurements.GeometryCircle Through 3 PointsFind a circle center, radius, and diameter from three points.ReferenceDrill Size ChartCompare common drill-size systems in one searchable reference.ReferenceMaterial Density ChartLook up nominal densities and send a custom value to Metal Weight.MachiningTap Drill CalculatorEstimate tap-drill diameter and compare nearby standard drill sizes.MachiningSpeeds & Feeds CalculatorEstimate a sourced starting point for spindle speed and feed.MachiningMeasurement Over Wires CalculatorCalculate thread measurement over wires with explicit corrections.
04 / Product catalog
Everything currently public.
24 products across the web, iPhone, iPad, and Apple Watch. Each has its own stable page, support route, and privacy context.
Market & professional tools
Research, calculation, learning, and focused work utilities.
ResearchProfitSearcher
Find products worth understanding.
Health informationAQI to Cigarettes Calculator
Turn an AQI reading into a decision.
UtilitiesKnitKit: Row Counter
Keep the row. Keep the rhythm.
ReferenceData Cheese
Turn scattered practice into a daily study loop.
UtilitiesWorkshop Calc
Fast estimates for work that still gets verified.
UtilitiesNoise Detective Pro Home
Turn an annoying sound into a clearer record.
Law, civics & aviation
Offline-first references for study and careful lookup.
Aviation referenceFAR/AIM Pilot Pro
The pilot reference desk that flies offline.
EducationUS Constitution Pro
America’s founding document, built for study.
Law & referenceFRE Rules: Evidence Law
The Federal Rules of Evidence, ready when the work is.
Law & referenceFRAP Rules & Procedure
FRAP, ready when the work is.
Law & referenceFRBP Rules: Bankruptcy Proc
FRBP, ready when the work is.
ReferenceConstitution of India Offline
India’s constitutional text, ready offline.
Law & referenceFRCP Rules
FRCP, ready when the work is.
ReferenceAustralian Constitution
Read the Commonwealth Constitution with context.
Law & referenceFRCrP Rules: Criminal Proc
FRCrP, ready when the work is.
Nature & field guides
Private, portable references for observing the world.
Nature referenceFish Identifier Offline
Six hundred species. Zero signal required.
Nature referenceWild Edibles Guide Offline
A careful field guide, even off-grid.
Nature referenceWild Vegetables Guide
A pocket atlas for learning—not guessing.
Nature referenceInsect Guide: Offline ID
Identify, compare, and record—on device.
Nature referenceMineralGuide: Gems & Rocks
A field reference for what the rock might be.
Nature referenceBird Guide – Offline Guide
Eight hundred sixty-eight species, wherever you wander.
Games & lifestyle
Playful companions and focused game utilities.
05 / About the lab
Small by design. Broad in curiosity.
YunFanLabs is an independent product studio. We work across reference, education, professional utilities, market research, and compact native experiences—shipping complete products instead of demos.
How we work ↗