Private · Quality · Tools. Offline-first PWA tools that respect your privacy — no accounts, no servers, no tracking.
Offline-first PWA tools for sourdough bakers and home gardeners. Track starters, log harvests, plan bakes — without an account.
Buy any contempl8 tool as a single HTML file. No subscription, no updates required, yours forever.
No accounts. No servers.
No telemetry. No exceptions.
Tactile key, real-time decoding, audio feedback. Record and replay your keying.
Five offline games for children — ABC, phonics, counting, math, and Turtle Tap. No accounts, no ads, safe by design.
RC, LR, RLC and active op-amp filters. Live Bode, Nyquist, impulse and step plots. Filter designer for Butterworth / Chebyshev / Bessel.
Cascaded biquad filters with live frequency response. Exports CMSIS-ready C for ARM DSP — float32, Q31, Q15.
Alkaline AAA/AA/C/D/9V runtime and discharge modeling. Shepherd voltage + Peukert capacity, CSV export.
More signal & power tools in the queue. Watch this space.