# Danie1s/Tiercel

Pure Swift iOS download framework with background downloads, relaunch recovery, resumable transfers, and task management.

Repository: https://github.com/Danie1s/Tiercel
Canonical: https://ross.abutalabs.com/products/tiercel
Homepage: https://github.com/Danie1s/Tiercel/wiki
Language: Swift
License: MIT
License Family: permissive
Topics: cocoapods, xcode, swift, ios, network, background-download, download-manager, file-download, resumable-download, urlsession
Last push: 2026-08-24T16:54:29+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 75, longevity 100
- inputs: {"age_days": 3091, "days_push": 9, "days_rel": 9, "gap_med": 111, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2867, forks 418 (observed 2026-08-28T04:07:26.720812+00:00)

## What it is
Tiercel is a pure Swift iOS download framework built on URLSession that provides native-level background downloads, resumable transfers, and relaunch recovery. It offers fine-grained task management with multiple isolated SessionManager instances, batch operations, and built-in speed and progress callbacks.

## Use cases
- download large files in an iOS app with background support
- resume interrupted downloads after app crash or relaunch
- manage multiple download queues with batch operations
- add pause, resume, and cancel controls to a download manager UI
- restrict downloads to wifi or handle cellular network policies
- verify downloaded file integrity with checksums

## When to choose
- you need downloads to survive app relaunches or kills
- you manage multiple download domains or queues in one app
- you want a higher-level API than raw URLSessionDownloadTask
- you need batch download operations with per-task control

## When to avoid
- you only need simple one-off downloads with no background or resume requirements
- your app targets Objective-C without bridging
- you need cross-platform downloads beyond iOS

## Facets
- artifact type: library
- maturity: active
- function: http-client, file-upload, developer-tools
- domain: mobile-development, files, networking
- platform: -
- tags: download-manager, background-download, resumable-download, urlsession, cocoapods, swift-package-manager, task-management, ios, swift, mobile

## Member repositories
- Danie1s/Tiercel (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:26.720812+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 2026-08-30T07:36:04.762889+00:00, confidence not recorded.
  - readme: https://github.com/Danie1s/Tiercel (fetched 2026-08-28T04:07:26.720812+00:00, sha bd659bff59a4)
  - homepage: https://github.com/Danie1s/Tiercel/wiki (fetched 2026-08-29T09:51:41.109449+00:00, sha a5202354bbcc)
- Data as of 2026-08-30T08:39:29.467469+00:00.