# tumblr/Backboard

A motion-driven animation framework for Android.

Repository: https://github.com/tumblr/Backboard
Canonical: https://ross.abutalabs.com/products/backboard
Language: Java
License: Apache-2.0
License Family: permissive
Topics: motion, animation, android, android-library
Last push: 2023-12-05T08:16:43+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4066, "days_push": 1002, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1679, forks 187 (observed 2026-08-28T04:05:21.347330+00:00)

## What it is
Backboard is a motion-driven animation framework for Android built on top of Facebook's Rebound spring physics library. It simplifies coupling springs to views and touch events via Performers, Imitators, and Actors.

## Use cases
- animate android views with spring physics
- make views follow touch drags smoothly
- create bounce and bloom UI animations
- map motion events to view properties
- build interactive gesture-driven interfaces on android

## When to choose
- building Android UIs with natural spring-based motion
- you want a simpler API over Facebook Rebound
- animating views in response to touch gestures

## When to avoid
- targeting non-Android platforms
- you prefer Jetpack Compose animation APIs
- the project needs actively maintained dependencies

## Facets
- artifact type: library
- maturity: maintenance
- function: animation
- domain: mobile-development, android-tools
- platform: -
- tags: spring-animation, motion-driven, rebound, touch-interaction, java, android

## Member repositories
- tumblr/Backboard (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:21.347330+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 2026-08-30T03:41:32.416592+00:00, confidence not recorded.
  - readme: https://github.com/tumblr/Backboard (fetched 2026-08-28T04:05:21.347330+00:00, sha ae994caf0711)
- Data as of 2026-08-30T08:39:29.467469+00:00.