# Etar-Group/Etar-Calendar

Android open source calendar

Repository: https://github.com/Etar-Group/Etar-Calendar
Canonical: https://ross.abutalabs.com/products/etar-calendar
Homepage: https://f-droid.org/packages/ws.xsoh.etar/
Language: Java
License: GPL-3.0
License Family: copyleft
Topics: calendar, android, material-design
Last push: 2026-08-23T01:37:56+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 83, longevity 100
- inputs: {"age_days": 4016, "days_push": 11, "days_rel": 37, "gap_med": 45, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2587, forks 446 (observed 2026-08-28T04:07:02.734142+00:00)

## What it is
Etar Calendar is an open-source, Material Design calendar application for Android, built as an enhanced fork of the AOSP Calendar. It supports month, week, day, and agenda views, offline calendars, and works with any calendar provider synced to the device.

## Use cases
- manage calendar events on android without google apps
- use an offline calendar stored only on my phone
- view month week day and agenda views in a material design calendar
- import and export calendars via ics files
- sync my calendar to a self-hosted caldav server
- use a privacy-friendly open source calendar app from f-droid
- add an agenda widget to my android home screen

## When to choose
- you want a free, open-source, privacy-respecting Android calendar
- you need offline calendars or sync via third-party CalDAV clients like DAVx5
- you want a Material Design calendar with dark/light themes and multilingual UI
- you want to contribute to or customize your calendar app

## When to avoid
- you need built-in CalDAV or Google Calendar sync without a separate sync app
- you rely heavily on stable ICS import, which has known bugs
- you need a calendar for iOS, desktop, or web platforms

## Facets
- artifact type: application
- maturity: active
- function: gui, internationalization, file-system
- domain: developer-tools, android-tools, privacy, cross-platform
- platform: -
- tags: calendar, material-design, offline-calendar, ics-import-export, agenda-widget, open-source, android, mobile

## Member repositories
- Etar-Group/Etar-Calendar (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:02.734142+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 2026-08-30T02:22:24.702901+00:00, confidence not recorded.
  - readme: https://github.com/Etar-Group/Etar-Calendar (fetched 2026-08-28T04:07:02.734142+00:00, sha 4de7a1330371)
  - homepage: https://f-droid.org/packages/ws.xsoh.etar/ (fetched 2026-08-29T10:04:47.549588+00:00, sha 2e72a6c0990c)
  - site_page: https://f-droid.org/en/docs (fetched 2026-08-29T10:04:47.552418+00:00, sha a2f2e12e8635)
  - site_page: https://f-droid.org/en/about (fetched 2026-08-29T10:04:47.554508+00:00, sha fe82affcffb2)
- Data as of 2026-08-30T08:39:29.467469+00:00.