1,300+ engineering tools across electronics, PCB, IoT, 3D printing, and more — each with a production-ready API. Free on the web, paid only when you go programmatic.
We build where others don't look — underserved engineering domains with zero good tooling online. Until now.
Every tool runs instantly in your browser, free, and ships with a clean JSON API for production. Here's a slice across the catalog.
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.
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.
Convert firmware images between raw binary, Intel HEX, and Motorola S-record. Validates checksums, preserves sparse address maps, handles linear and segmented Intel HEX addressing, and emits a raw hex preview for inspection.
Free in-browser API testing tool (Postman alternative). Fire HTTP requests (GET, POST, PUT, DELETE, etc.) against any URL straight from your browser with custom headers and body.
Compare Old vs New tax regime for FY 2025-26 (Finance Act 2025). Handles HRA, flexi bucket (food, NPS, LTA, mobile, uniform, prof-dev), 80C/80D/80CCD1B/24B, 87A rebate and surcharge tiers. Returns total tax, monthly TDS, effective rate, and a regime pick.
Calculate the exact number of days, weeks, months, or years between two dates, or add/subtract time from a date, with options to exclude weekends and holidays.
Layer and bottom exposure plus Jacob's-curve cure depth from resin critical energy, penetration depth, printer LED power and layer height. Flags under-cure (delamination) and over-cure (brittle, blooming).
Realistic flight-time estimate for any multirotor — uses hover efficiency (g/W), pack voltage, ESC efficiency, usable-capacity derating and a flight-style multiplier instead of the naive mAh ÷ current formula.
Build a cron expression part-by-part, get a plain-English description, and preview the next five scheduled runs in your timezone. Handles ranges, lists, step values, and named days.
REST endpoints, clean JSON. Drop engineering intelligence into your app in minutes. No SDK required — just HTTP.
Designed for indie builders and teams. Start free, upgrade when you ship something real.
Every tool runs free in your browser — no signup, no usage limits, and no ads on the calculators. The paid tier exists only for programmatic API access at scale.
Yes. Every tool has a matching JSON API at /api/v1/{domain}/{slug}. The free key includes 500 calls a month; paid tiers scale to 50,000+ and unlimited.
Each tool documents the formula and the standard it follows, and ships with a test suite — nominal, edge, and invalid cases — that runs in CI before the tool goes live.
We build the underserved corners of engineering — Indian standards like IS 456 and IS 875, modern PCB rules like IPC-2152, and full resin-printing workflows — that are usually paywalled or scattered across broken pages.
Yes. The tools are free to use for personal and commercial work. For production integrations, the JSON API and (soon) white-label embedding cover that use case.