Reference

Changelog

What's new. Tools land here automatically — each tool's `added` date is its release stamp.

2026-05-17
  • LLM API Cost Calculator — v1.0.0 · Estimate monthly API cost for any LLM workload across Anthropic and OpenAI models. Includes prompt-cache and batch-API math so you see what you actually pay — not just the headline rate.
2026-05-16
  • ESP32 Deep-Sleep Battery Life — v1.0.0 · Project lifetime for an ESP32 (or any duty-cycled MCU) running on battery. Computes average current and lifetime from sleep current, wake current, wake duration, cycle period, and battery derating.
  • GST Reverse Charge (RCM) Calculator — CGST Act §9(3) / IGST Act §5(3) · v1.0.0 · Compute the GST liability under the Reverse Charge Mechanism — the supplier doesn't collect tax, the recipient self-assesses it. Splits CGST/SGST or IGST, and flags Input Tax Credit eligibility.
  • MOSFET Junction Temperature — v1.0.0 · Compute MOSFET junction temperature from drain current, RDS(on), thermal resistance, ambient temperature and duty cycle. Flags marginal and danger conditions against the configured Tj-max.
  • PCB Trace Width Calculator — IPC-2221 · v1.0.0 · IPC-2221 compliant trace width for a given current, temperature rise, copper weight, and layer position. Returns width in millimetres and mils plus cross-sectional area.