Top 12 Open-Source Alternatives to Tampermonkey

Product categories

A/B Testing API Tools APIs Browser Extension Browsing Experience CSS Framework Communication Dark Mode Design Tools Developer Tools Monitoring Tools Tool

Summary

The top open-source alternatives to Tampermonkey are Violentmonkey, Greasemonkey, and Stylus - User Styles Manager. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Violentmonkey Landing Page
1

Violentmonkey

Violentmonkey is a userscript manager to support running userscripts in web pages.
Pricing:
- Open Source
#Browser Extension #Dark Mode #Tool 45 social mentions
Greasemonkey Landing Page
2

Greasemonkey

Customize the way a web page displays or behaves, by using small bits of JavaScript.
Pricing:
- Open Source
#Browser Extension #Dark Mode #Tool 1 social mentions
Stylus - User Styles Manager Landing Page
3

Stylus - User Styles Manager

Stylus is a userstyles editor and manager based on the source code of Stylish version 1.5.2.
Pricing:
- Open Source
#Browser Extension #Developer Tools #Dark Mode 47 social mentions
Stylebot Landing Page
4

Stylebot

Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me
Pricing:
- Open Source
#Browser Extension #Developer Tools #Dark Mode 14 social mentions
Dark Reader Landing Page
5

Dark Reader

Reduce eye strain in your browser with this extension that provides a dark theme for browsing.
Pricing:
- Open Source
#Browser Extension #Dark Mode #Developer Tools 183 social mentions
User-Agent Switcher and Manager Landing Page
6

User-Agent Switcher and Manager

spoofs browser's User-Agent string.
Pricing:
- Open Source
#Monitoring Tools #Browser Extension #Dark Mode 3 social mentions
Stylus Landing Page
7

Stylus

EXPRESSIVE, DYNAMIC, ROBUST CSS
Pricing:
- Open Source
#Developer Tools #Browser Extension #Dark Mode 11 social mentions
midnight-lizard.org
8

Midnight Lizard

Accessible color schemes for all websites
Pricing:
- Open Source
#Browser Extension #Dark Mode #Browsing Experience
Material UI Landing Page
9

Material UI

A CSS Framework and a Set of React Components that Implement Google's Material Design
Pricing:
- Open Source
#Design Tools #Development Tools #Developer Tools 75 social mentions
Postman Landing Page
10

Postman

The Collaboration Platform for API Development
Pricing:
- Open Source
#APIs #API Tools #Developer Tools 27 social mentions
LaunchDarkly Landing Page
11

LaunchDarkly

LaunchDarkly is a powerful development tool which allows software developers to roll out updates and new features.
Pricing:
- Open Source
#Feature Flags #Developer Tools #A/B Testing 36 social mentions
React Complex Tree Landing Page
12

RCT

React Complex Tree

Unopinionated accessible tree component with drag and drop
Pricing:
- Open Source
#Developer Tools #Design Tools #Productivity 2 social mentions