Step-by-step fixes, checks, and browser workflows.
Measurements, setup notes, and sound-system fundamentals.
Local-first workflow notes for developers.
Practical ways to handle files and data safely.
How to test peripherals and interpret the results.
Resistor codes, Ohm's law, and battery capacity math.
Resistor codes, Ohm's law and the watt-hour math behind battery claims, worked through with the calculators on this site so you can check each number yourself.
Battery listings show mAh, not watt-hours. Convert them, test the claim against weight and delivered energy, and choose a power bank that delivers.
Marketing specs obscure the real runtime. Use Ohm's Law and free browser math tools to verify power station capacity before you buy.
Measure power-rail voltage, decode resistor markings, and compute expected dissipation to decide if your LED driver is worth repairing before desoldering.
Master Ohm's Law and Watt's Law so you can solve any circuit equation by hand and know when to reach for a calculator.
Decode 4/5/6-band resistors offline for automotive ECU repairs. Avoid cloud tools, protect proprietary schematics, and fix heat-damaged components fast.
Repair vintage guitar amps by decoding resistor values offline. Systematic troubleshooting for bias, preamp, and power stages.
Learn to decode 6-band resistor color codes for precision electronics prototyping using a client-side, zero-cloud calculator.
Offline unit conversion for solar and battery projects. Learn essential conversions and avoid common errors.
Convert solar panel specs and battery capacities correctly for reliable off-grid power systems using CapyToolkit.
Learn to decode resistor colour bands offline with CapyToolkit's browser-based calculator for fast prototyping and field repairs.
Installing puts every tool one tap from your home screen, no browser required.
It stays cached locally, so tools keep working on a plane, on a locked-down network, anywhere signal doesn't reach.
Search tools, blog posts and pages…
Install from Microsoft Store