# matterhorn-chat/matterhorn

A feature-rich Unix terminal client for the Mattermost chat system

Repository: https://github.com/matterhorn-chat/matterhorn
Canonical: https://ross.abutalabs.com/products/matterhorn
Language: Haskell
License: BSD-3-Clause
License Family: permissive
Topics: mattermost-chat, tui, client, haskell, mattermost, brick
Last push: 2026-08-25T18:36:11+00:00

## Health v2 (maintenance only)
Score: 71/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 19, longevity 100
- inputs: {"age_days": 3666, "days_push": 8, "days_rel": 329, "gap_med": 211, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1152, forks 81 (observed 2026-08-28T04:03:46.860226+00:00)

## What it is
Matterhorn is a feature-rich terminal (TUI) client for the Mattermost chat system, written in Haskell using the brick library. It supports message posting and editing, threads, multiple teams, markdown rendering, emoji reactions, and keybinding customization.

## Use cases
- use mattermost from the terminal
- chat on mattermost without a browser
- tui chat client for mattermost
- read and post mattermost messages over ssh
- manage mattermost channels from the command line

## When to choose
- you live in the terminal and use Mattermost
- you need a lightweight, keyboard-driven Mattermost client
- you want to access Mattermost over SSH on remote machines

## When to avoid
- you need a graphical interface with rich media previews
- you use a chat platform other than Mattermost
- you need mobile access

## Facets
- artifact type: application
- maturity: active
- function: chat-interface, terminal-ui, http-client
- domain: messaging-platforms, developer-tools
- platform: cli, cross-platform
- tags: mattermost, tui, haskell, chat-client, brick, command-line, linux, macos

## Member repositories
- matterhorn-chat/matterhorn (main) score 71

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:46.860226+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 2026-08-30T06:33:33.663596+00:00, confidence not recorded.
  - readme: https://github.com/matterhorn-chat/matterhorn (fetched 2026-08-28T04:03:46.860226+00:00, sha 3f08bc8fd53a)
- Data as of 2026-08-30T08:39:29.467469+00:00.