# fabiocaccamo/FCUUID

:iphone: :id:  iOS UUID / Universally Unique Identifiers library as alternative to UDID and identifierForVendor.

Repository: https://github.com/fabiocaccamo/FCUUID
Canonical: https://ross.abutalabs.com/products/fcuuid
Language: Objective-C
License: MIT
License Family: permissive
Topics: uuid, udid, persistence, device, unique-identifier, ios, objective-c, uuids, pod, session, installation, vendor, identifierforvendor, icloud, device-uuid, uickeychainstore, keychain
Last push: 2026-04-22T14:30:43+00:00

## Health v2 (maintenance only)
Score: 58/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 78, release rhythm 8, longevity 100
- inputs: {"age_days": 4349, "days_push": 133, "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 1644, forks 238 (observed 2026-08-28T04:05:16.169110+00:00)

## What it is
An Objective-C iOS library providing universally unique identifiers with different persistence levels (session, installation, device, user) as an alternative to UDID and identifierForVendor. It stores UUIDs in the keychain and can sync device UUIDs across a user's devices via iCloud key-value storage.

## Use cases
- get a persistent device identifier on iOS that survives app reinstalls
- replace deprecated UDID or identifierForVendor in an iOS app
- identify the same user across multiple devices with server-side help
- generate session- or installation-scoped UUIDs
- store a device UUID in the keychain so it persists across uninstalls
- migrate an existing UDID or UUID to a new stable device identifier

## When to choose
- you need stable device or user identifiers on iOS with varying persistence levels
- you want keychain-backed persistence that survives app deletion
- you need to link guest accounts across a user's devices via iCloud

## When to avoid
- you target platforms other than iOS
- you only need a random one-off UUID (use NSUUID instead)
- your project cannot enable keychain or iCloud key-value storage capabilities

## Facets
- artifact type: library
- maturity: stable
- function: sdk, security, developer-tools
- domain: mobile-development, apple-ecosystem, privacy, developer-tools
- platform: -
- tags: uuid, udid, identifierforvendor, keychain, icloud, objective-c, device-identifier, persistence, cocoapods, ios, mobile

## Member repositories
- fabiocaccamo/FCUUID (main) score 58

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:16.169110+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 2026-08-30T03:45:49.195901+00:00, confidence not recorded.
  - readme: https://github.com/fabiocaccamo/FCUUID (fetched 2026-08-28T04:05:16.169110+00:00, sha b1844e89c84d)
- Data as of 2026-08-30T08:39:29.467469+00:00.