# rt-bishop/Look4Sat

Satellite tracker and pass predictor for Android, inspired by Gpredict

Repository: https://github.com/rt-bishop/Look4Sat
Canonical: https://ross.abutalabs.com/products/look4sat
Homepage: https://play.google.com/store/apps/details?id=com.rtbishop.look4sat
Language: Kotlin
License: GPL-3.0
License Family: copyleft
Topics: sdr, space, satellite, ham-radio, hamradio, amsat, radio, spacex, hamlib, nasa, gps, satellites, kotlin, satellite-data, satellite-position, starlink, celestrak, satnogs, satellite-prediction
Last push: 2026-09-02T14:35:03+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 97, longevity 100
- inputs: {"age_days": 2516, "days_push": 0, "days_rel": 20, "gap_med": 6.0, "n_releases_24m": 21}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1300, forks 144 (observed 2026-09-03T02:15:17.528442+00:00)

## What it is
Look4Sat is an open-source, ad-free satellite tracker and pass predictor for Android, inspired by Gpredict. It calculates satellite positions and passes offline using TLE data from Celestrak, SatNOGS, or custom imports, showing polar trajectories, ground tracks, and transceiver info.

## Use cases
- predict upcoming satellite passes over my location
- track ham radio satellites on Android
- find when the ISS or Starlink satellites pass overhead
- import custom TLE files to track specific satellites
- view satellite ground track and footprint on a map
- get transceiver info for active satellite passes
- offline satellite tracking without internet

## When to choose
- you need an Android app to track satellites and predict passes
- you want offline-first calculations with weekly TLE updates
- you're a ham radio operator or SDR enthusiast looking for pass schedules
- you want a free, open-source alternative to Gpredict on mobile

## When to avoid
- you need desktop satellite tracking with rotor/antenna control
- you're on iOS or another non-Android platform
- you need real-time satellite telemetry decoding rather than pass prediction

## Facets
- artifact type: application
- maturity: active
- function: simulation, data-visualization, geospatial
- domain: astronomy, mobile-development
- platform: jvm
- tags: satellite-tracking, pass-prediction, ham-radio, sdr, tle, gpredict-inspired, offline-first, jetpack-compose, radio, android, mobile

## Member repositories
- rt-bishop/Look4Sat (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:17.528442+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 2026-08-30T04:54:06.581578+00:00, confidence not recorded.
  - readme: https://github.com/rt-bishop/Look4Sat (fetched 2026-09-03T02:15:17.528442+00:00, sha 0e86fd422a0a)
  - homepage: https://play.google.com/store/apps/details?id=com.rtbishop.look4sat (fetched 2026-08-29T12:10:50.478521+00:00, sha 44136fa355b3)
- Data as of 2026-08-30T08:39:29.467469+00:00.