Violentmonkey
Database Script Tool
Userscripts
Script Manager – SManager
Greasemonkey
Tampermonkey
UserStyles.world
A site for user scripts.

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

Which is more popular?
Based on our record, Greasy Fork seems to be more popular. It has been mentioned 29 times since March 2021.
Website, pricing, platforms and company facts side by side.
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GF
Greasy Fork
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| Website | greasyfork.org | diffyn.com |
| Pricing | — | |
| Platforms | — | |
| Listed in |
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

No analysis of Greasy Fork yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
moonlight feels right
The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Greasy Fork and Diffyn.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Diffyn's answer:
React, Next.js, POSTGRESQL
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
Share your experience with using Greasy Fork and Diffyn. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Have tampermonkey installed (google), then go to greasyfork (website) I have the link here https://greasyfork.org/en and search up character ai, have fun :)). Source: over 3 years ago
If the above mentioned URL rewriter doesn't work for you (I found it hard to use myself, and never could get the rules figured out), then you could try using https://github.com/janekptacijarabaci/greasemonkey and finding a redirect... Source: over 3 years ago
I was thinking more greasemonkey / userscripts. Source: over 3 years ago
Tracking Diffyn since Jun 2025.
When comparing Greasy Fork and Diffyn, you can also consider the following products.

Violentmonkey is a userscript manager to support running userscripts in web pages.
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Database Script Tool is an all-in-one functional code generator that allows you to generate several types of code, including SQL standard commands, classes, resource files, HTML 5 forms, Data managers, and more to add.
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An open-source userscript editor for Safari.
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Script Manager – SManager is an Android application that makes it easy for you to execute scripts and executables, file manager, multi-tab browser root explorer, and terminal emulator.
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Customize the way a web page displays or behaves, by using small bits of JavaScript.
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