# iSparta/iSparta

APNG、WebP converter

Repository: https://github.com/iSparta/iSparta
Canonical: https://ross.abutalabs.com/products/isparta
Homepage: http://isparta.github.io/
Language: JavaScript
License Family: other
Topics: webp, apng, png, lossless, convertor, electron-app
Last push: 2024-01-30T02:25:26+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4333, "days_push": 947, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1293, forks 122 (observed 2026-08-28T04:04:16.145221+00:00)

## What it is
iSparta is a desktop GUI application built with Electron for converting and compressing images. It converts PNG sequences to APNG, converts PNG/GIF/APNG to (animated) WebP, and performs lossless or lossy compression of PNG and GIF files.

## Use cases
- convert a sequence of pngs into an animated apng
- convert png or gif images to webp format
- convert apng animations to animated webp
- losslessly compress png and gif files to reduce size
- batch convert and compress images with custom frame rates and loop counts

## When to choose
- you need a cross-platform GUI tool for APNG/WebP conversion without the command line
- you want to merge numbered PNG frames into an APNG with per-frame frame-rate control
- you need batch lossless compression of PNG/GIF assets

## When to avoid
- you need command-line or CI automation rather than a desktop app
- you need video-to-APNG conversion (still on the to-do list)
- you require a project with an explicit open-source license

## Facets
- artifact type: application
- maturity: maintenance
- function: image-processing, compression, gui
- domain: image-processing, media, cross-platform
- platform: windows, cross-platform
- tags: apng, webp, png-conversion, lossless-compression, animated-images, macos, linux, electron

## Member repositories
- iSparta/iSparta (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:16.145221+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 2026-08-30T04:54:41.974365+00:00, confidence not recorded.
  - readme: https://github.com/iSparta/iSparta (fetched 2026-08-28T04:04:16.145221+00:00, sha 13da0790feb3)
  - homepage: http://isparta.github.io/ (fetched 2026-08-29T12:11:19.049579+00:00, sha 6249c6f93122)
- Data as of 2026-08-30T08:39:29.467469+00:00.