OpenDMG
Lockin icon

Lockin for Mac

Free distraction blocker for apps and websites.

By sigma-prog. Free and open source, MIT licence.

Get it with OpenDMG View source on GitHub

Lockin at a glance

Version
1.0.0
Released
28 September 2026
Download size
230 KB
Works on
Apple silicon and Intel
Licence
MIT
Category
Productivity
Developer
sigma-prog
GitHub stars
4

About Lockin

A app that blocks distractions for FREE.

Screenshots

Lockin screenshot 1

How to install Lockin on a Mac

  1. Get OpenDMG. It is a free app store for open source Mac apps. Download OpenDMG.
  2. Search for Lockin and press Get. OpenDMG downloads version 1.0.0 from sigma-prog's own GitHub release.
  3. Open it. The download is checked against its SHA-256 fingerprint and its signature is checked on your Mac before it lands in Applications.

Updates to Lockin show up in OpenDMG and install with one button. No account is needed.

Prefer to do it by hand? The developer's file is on GitHub: Lockin.zip (230 KB).

What is new in Lockin 1.0.0

# Lockin v1.0.0

A brutal, tamper-proof, zero-bloat distraction blocker for macOS.

### Key Features
- **Insta kill** Kills blacklisted apps immediately with zero warning.
- **VPN-Proof Website Blocking:** Closes distracting tabs in Safari and Google Chrome at the process level (immune to VPNs & encrypted DNS).
- **Anti Tamper clock:** Uses hardware CPU tick counters (`mach_continuous_time`) to prevent changing the macOS clock to cheat the timer.
- **Auto Resurrection:** Supervised by `launchd`—if forced to quit via Activity Monitor or Terminal, it brings itself back within 1 second.
- **Hardware Event Interception:** Swallows `Cmd + Q` and disables the red window close button while locked.
- **Zero Bloat:** Pure native Swift/SwiftUI, ~25MB RAM, 0% idle CPU.

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### Installation

1. Download **`Lockin.zip`** below and unzip it.
2. Drag `Lockin.app` into your **/Applications** folder.
3. Open Terminal and run this one command to approve the open-source app:
 ```bash
 xattr -cr /Applications/Lockin.app
 
 Click allow on any popup for it to work.

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