# pilgr/Paper

Paper is a fast NoSQL-like storage for Java/Kotlin objects on Android with automatic schema migration support.

Repository: https://github.com/pilgr/Paper
Canonical: https://ross.abutalabs.com/products/pilgr-paper
Language: Java
License: Apache-2.0
License Family: permissive
Topics: mobile-database, nosql, android, database, performace, paper
Last push: 2023-01-06T22:00:05+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": 4101, "days_push": 1335, "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 2343, forks 235 (observed 2026-08-28T04:06:39.386217+00:00)

## What it is
Paper is a fast, NoSQL-like object storage library for Android that persists Java/Kotlin classes as-is, without annotations or boilerplate. It handles limited schema changes (added/removed fields) automatically on read.

## Use cases
- store java objects on android without writing sql
- persist kotlin data classes locally
- nosql key-value storage for android app
- save and load lists of objects on android
- local cache with automatic schema migration
- simple object database for android app

## When to choose
- you want to persist plain Java/Kotlin objects with zero annotations or configuration
- your data model changes occasionally and you want automatic handling of added/removed fields
- you need fast key-based object storage rather than relational queries

## When to avoid
- you need complex queries, indexes, or relational data — use Room or SQLite instead
- you frequently change field types in your data classes, which Paper does not support
- you need cross-platform storage beyond Android

## Facets
- artifact type: library
- maturity: maintenance
- function: database, serialization
- domain: mobile-development, databases, android-tools
- platform: -
- tags: nosql, object-storage, kotlin, schema-migration, key-value-store, android

## Member repositories
- pilgr/Paper (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:39.386217+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 2026-08-30T02:37:15.553654+00:00, confidence not recorded.
  - readme: https://github.com/pilgr/Paper (fetched 2026-08-28T04:06:39.386217+00:00, sha f0a2d4fa8a8c)
- Data as of 2026-08-30T08:39:29.467469+00:00.