Small tools for real problems.
Engineering calculators, control-system demonstrations, and everyday decision aids—built to make a useful task clearer without unnecessary friction.
The everyday tools run in your browser and do not require an account.Small Useful Things
Seven straightforward tools for decisions that are common, annoying, and usually more complicated than they should be.
Decision Untangler
Compare up to three choices against weighted criteria that matter to you.
Open tool ↗ COMPARE COSTSRepair or Replace?
Compare repair and replacement costs on an annualized basis.
Open tool ↗ COMMUNICATEDifficult Message Builder
Turn facts, a request, and a boundary into a calmer message.
Open tool ↗ PERSPECTIVETrue Cost of Time
Translate a purchase price into after-tax work hours and cost per hour of use.
Open tool ↗ RECURRING COSTSubscription Reality Check
See annual cost, total commitment, and cost per actual use.
Open tool ↗ SHARED COSTFair Split
Divide a bill evenly or use shares when portions should differ.
Open tool ↗ PLAN BACKWARDDeadline Backplanner
Turn one due date into editable checkpoints with breathing room.
Open tool ↗Interactive engineering utilities
Focused browser tools for controls, automation, data conversion, and technical experimentation.
PID Controller Simulator
Explore proportional, integral, and derivative response through an interactive control-loop demonstration.
Launch simulator → AUTOMATIONPLC Simulator
Experiment with basic programmable-logic behavior and see how control conditions affect outputs.
Launch simulator → DATA8b10b & Number Converter
Convert number formats and work through 8b10b encoding concepts in one compact utility.
Open converter → ANALYSISLight Analysis Tool
Explore light-related values and calculations for technical analysis and experimentation.
Open analysis → TIMEUTC & Unix Time Converter
Translate between UTC, local time, and Unix timestamps without juggling multiple references.
Open converter → UTILITYQR Code Generator
Create a QR code from text or a link directly in the browser.
Generate a code → DEMONSTRATIONAI & Machine Learning Demo
A compact interactive demonstration of practical AI and machine-learning concepts.
Open demo →Built in the open.
Review the portfolio source, suggest an improvement, or adapt an idea for your own work.