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Kitbench

Small, exact tools for jobs where generic utilities get the details wrong. Everything runs on your device — nothing you enter is uploaded.

Version constraint checkers

Test dependency version ranges with each ecosystem's exact rules. They differ more than you think.

PEP 440 version specifier checker Which versions does a pip specifier like ~=1.4.2 accept?
Terraform version constraint tester What does ~> really allow for providers, modules and required_version?
Cargo version requirement checker See the real range behind Cargo.toml requirements like 1.2 or ^0.3.

Electronics calculators

Solve circuit problems with real, purchasable parts instead of ideal values.

Voltage divider with standard resistor values Best real E6–E192 resistor pairs or trios for a target output voltage.