Cockatrice
ForgeMtG
Magarena
Wagic
Iris and the Giant
Infinity Wars
Change.org
XMage allows you to play Magic against one or more online players or computer opponents.

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, XMage seems to be more popular. It has been mentioned 37 times since March 2021.
Website, pricing, platforms and company facts side by side.
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XMage
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| Website | xmage.today | diffyn.com |
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In their own words, as submitted to SaaSHub.

It's fully free and open source app that allows to play Magic against one or more online players or computer opponents. It includes full rules enforcement for over 30 000 unique cards and more than 75 000 reprints from different editions. You can also find custom sets like Star Wars. It supports...
No description of Diffyn yet.
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 XMage yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
A Quick Overview of What Xmage Is and How It Works
More videos
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 XMage 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 XMage and Diffyn. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

For the past two days, I have been unable to access xmage.de. Is the server offline? Is it dead? No one has said anything. Does anyone know what is going on???? I hope this is not the end!!! Source: over 3 years ago
Launcher hasn't worked for a week, can't reach xmage.de, and isitdownrightnow agrees. What's going on? Source: almost 4 years ago
You can use Xmage or Cockatrice as dedicated online free platforms, or Untap for in-browser gameplay (Untap has no built in rules engine, so be careful that you're following the rules!). There is also a small but dedicated group that... Source: almost 4 years ago
Tracking Diffyn since Jun 2025.
When comparing XMage and Diffyn, you can also consider the following products.

Cockatrice is an open-source, multiplatform program for playing tabletop card games over a network.
Compare Cockatrice to XMage or Diffyn:
Forge is an implementation of Magic the Gathering that lets you play against a computer AI opponent using most of the rules of a real game. You can construct decks for you and the computer to play with, or play in a draft or a sealed deck format.
Compare ForgeMtG to XMage or Diffyn:

Magarena is a single-player fantasy card game played against a computer opponent.
Compare Magarena to XMage or Diffyn:

Wagic the Homebrew. Contribute to WagicProject/wagic development by creating an account on GitHub.
Compare Wagic to XMage or Diffyn:

Iris and the Giant is a fusion of a collectible card game with RPG and roguelike elements. You play as Iris, who must brave her fears in her imaginary world.
Compare Iris and the Giant to XMage or Diffyn:

Infinity Wars is a Turn-based Strategy, Massively Multiplayer Online Role-playing, Collectible and Trading Card video game published by Lightmare Studios.
Compare Infinity Wars to XMage or Diffyn: