# contentful-labs/Concorde

Download and decode progressive JPEGs on iOS.

Repository: https://github.com/contentful-labs/Concorde
Canonical: https://ross.abutalabs.com/products/concorde
Language: Objective-C
License: MIT
License Family: permissive
Last push: 2022-02-08T14:29:54+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4194, "days_push": 1667, "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 1431, forks 146 (observed 2026-08-28T04:04:42.965373+00:00)

## What it is
Concorde is an Objective-C framework for downloading and progressively decoding progressive JPEG images on iOS and OS X, built on libjpeg-turbo. It provides CCBufferedImageView, a drop-in image view that displays images as they stream in.

## Use cases
- show progressive JPEGs loading incrementally in an iOS app
- download and decode large JPEGs without blocking the main thread
- replace UIImageView with a progressively rendering image view
- display images faster on slow network connections
- integrate progressive image loading with the Contentful delivery API

## When to choose
- your iOS or OS X app displays progressive JPEGs and you want incremental rendering
- you want a simple drop-in UIImageView replacement backed by libjpeg-turbo
- you use Contentful and want automatic progressive JPEG delivery

## When to avoid
- you need modern Swift-first image loading with broad format support (consider alternatives like SDWebImage or Kingfisher)
- your project targets platforms beyond iOS/OS X
- you need actively maintained code with recent updates

## Facets
- artifact type: library
- maturity: maintenance
- function: image-processing, http-client, ui-components
- domain: image-processing, mobile-development, media
- platform: -
- tags: progressive-jpeg, objective-c, cocoapods, libjpeg-turbo, imageview, ios, macos

## Member repositories
- contentful-labs/Concorde (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:42.965373+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 2026-08-30T04:37:06.314507+00:00, confidence not recorded.
  - readme: https://github.com/contentful-labs/Concorde (fetched 2026-08-28T04:04:42.965373+00:00, sha 3a91e7a85028)
- Data as of 2026-08-30T08:39:29.467469+00:00.