printfn/fend

Some data may be outdated — see provenance labels.

Arbitrary-precision unit-aware calculator observed · 2026-09-25

github.com/printfn/fend · homepage · Rust · MIT (permissive) observed · 2026-09-25

Health v2 · maintenance only

74/100

Activity 92
Release rhythm 36
Longevity 100

How is this computed?

round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.

gap_med: 122
age_days: 2272
days_rel: 269
days_push: 53
n_releases_24m: 4

Full methodology

Adoption not part of the score

1041 stars · 73 forks observed · 2026-09-25

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

fend is an arbitrary-precision, unit-aware calculator written in Rust, available as a CLI REPL, a Rust library (fend-core), and a web interface. It supports SI, US/UK customary and historical units, complex numbers, variables, multiple number bases, dice rolls, and lambda calculus.

Use cases

convert 1 ft to cm from the terminal
do arbitrary-precision math without floating point errors
calculate with units of measure like SI and imperial units
convert between hex, binary, octal and other bases
roll D&D-style dice from the command line
embed a unit-aware calculator into a Rust application

When to choose

you need a fast terminal calculator with unit conversion
you need exact rational arithmetic instead of floating point
you want a calculator library to embed in Rust projects

When to avoid

you need a full spreadsheet or symbolic algebra system (CAS)
you need graphing or plotting capabilities

Facets

cli-tool · maturity active

math cli mathematics developer-tools cli cross-platform windows calculator units-of-measure arbitrary-precision unit-conversion repl rust command-line linux macos web-server

3 sources

readme: https://github.com/printfn/fend · fetched 2026-09-25 · aa4b837a28b2
homepage: https://printfn.github.io/fend · fetched 2026-08-29 · 221f5cd04146
registry_crates: https://crates.io/api/v1/crates/fend · fetched 2026-08-29 · 30d1bade5454

Member repositories

Repository	Role	Health v2
printfn/fend	main	74

For agents

markdown · JSON · MCP: product_card(name="printfn/fend")

Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem