# schollz/progressbar

A really basic thread-safe progress bar for Golang applications

Repository: https://github.com/schollz/progressbar
Canonical: https://ross.abutalabs.com/products/progressbar
Homepage: https://pkg.go.dev/github.com/schollz/progressbar/v3?tab=doc
Language: Go
License: MIT
License Family: permissive
Topics: progress-bar, golang, progressbar, library, command-line, go, terminal, hacktoberfest
Last push: 2026-08-18T20:03:45+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 90, longevity 100
- inputs: {"age_days": 3233, "days_push": 15, "days_rel": 64, "gap_med": 21, "n_releases_24m": 8}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4696, forks 255 (observed 2026-08-28T04:08:57.129923+00:00)

## What it is
A thread-safe progress bar library for Go applications that works across all operating systems. It supports io.Writer integration for automatic byte counting, spinners for unknown-length tasks, and extensive customization of themes, colors, and output.

## Use cases
- show a progress bar for a long-running loop in a Go CLI
- display download progress while copying an HTTP response body to a file
- show a spinner for tasks with unknown duration
- wrap io.Reader/io.Writer streams to track bytes processed
- customize progress bar colors, width, and theme in a terminal app

## When to choose
- you need a simple, dependency-light, thread-safe progress bar in Go
- you want automatic progress tracking for io.Copy and streaming operations
- cross-platform terminal compatibility matters and you only need single-line output

## When to avoid
- you need multi-line or dashboard-style terminal output
- your project is not written in Go
- you need rich TUI widgets beyond a single progress bar

## Facets
- artifact type: library
- maturity: stable
- function: developer-tools, cli
- domain: developer-tools
- platform: go, cross-platform, cli
- tags: progress-bar, terminal-ui, thread-safe, io-writer, spinner, command-line

## Member repositories
- schollz/progressbar (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:57.129923+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:19:14.274609+00:00, confidence not recorded.
  - readme: https://github.com/schollz/progressbar (fetched 2026-08-28T04:08:57.129923+00:00, sha 12afad6d8eae)
  - homepage: https://pkg.go.dev/github.com/schollz/progressbar/v3?tab=doc (fetched 2026-08-29T09:03:08.424699+00:00, sha f94b15183278)
  - site_page: https://pkg.go.dev/about (fetched 2026-08-29T09:03:08.434902+00:00, sha 757852027879)
  - site_page: https://go.dev/project (fetched 2026-08-29T09:03:08.437872+00:00, sha d5ca00bb378b)
- Data as of 2026-08-30T08:39:29.467469+00:00.