# alexzielenski/optool

Command Line Tool for interacting with MachO binaries on OSX/iOS

Repository: https://github.com/alexzielenski/optool
Canonical: https://ross.abutalabs.com/products/optool
Language: Objective-C
License: BSD-2-Clause
License Family: permissive
Last push: 2019-09-06T06:35:12+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": 4411, "days_push": 2553, "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 1287, forks 247 (observed 2026-08-28T04:04:15.084462+00:00)

## What it is
A command line tool for modifying Mach-O binaries on macOS and iOS. It can insert or remove load commands, strip or repair code signatures, and disable ASLR.

## Use cases
- inject a dylib into an existing Mach-O binary
- remove code signature from an iOS app binary
- disable ASLR in a macOS executable
- remove load commands pointing to a dylib
- resign a binary after patching it

## When to choose
- you need to patch Mach-O binaries for iOS tweak development or reverse engineering
- you want a lightweight scriptable alternative to install_name_tool for load command manipulation

## When to avoid
- you need actively maintained tooling with recent macOS code-signing support
- you only want to inspect binaries rather than modify them

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: reverse-engineering, cli, security
- domain: reverse-engineering, security, apple-ecosystem, developer-tools
- platform: cli
- tags: macho, binary-patching, dylib-injection, code-signing, ios-tweaks, macos, ios

## Member repositories
- alexzielenski/optool (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:15.084462+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 2026-08-30T04:55:50.931816+00:00, confidence not recorded.
  - readme: https://github.com/alexzielenski/optool (fetched 2026-08-28T04:04:15.084462+00:00, sha 16fe21efc1d0)
- Data as of 2026-08-30T08:39:29.467469+00:00.