Last Updated on October 5, 2026 by Bala Kumar

Why open-source poker tools matter

Most poker software costs money. Solvers, trackers and trainers often charge subscriptions or licence fees running from tens to hundreds of dollars. Yet some of the most impressive poker software ever written is completely free, built by programmers, researchers and players who simply wanted it to exist.

These open poker tools share their source code publicly. Anyone can download them, check exactly how they work, and even improve them. For a player on a budget, a student learning game theory, or a developer building a poker app, that’s a huge advantage.

This guide covers the most useful open source poker software available today, what each tool is actually good for, and how active each project is right now. We checked every project’s public code repository and package listing on October 5, 2026.

Open source vs “free”: what’s the difference?

Plenty of free poker software isn’t open source. A free app might hide its code, collect your data, show ads or disappear when the company loses interest.

Open source poker software is different in three practical ways:

•           You can see how it works. No mystery formulas. If a tool says it calculates equity a certain way, anyone can verify it.

•           It can’t really vanish. Even if the original author stops working on it, the code stays public and others can pick it up.

•           It runs on your terms. Most tools work offline on your own computer, so your hand histories and strategy files stay with you.

The trade-off is polish. Open-source tools rarely have the slick interfaces, tutorials and customer support of paid products.

The best open poker tools in 2026 (live data)

“Stars” are bookmarks from developers on the code-hosting platform where each project lives. They’re a rough but useful signal of how widely a tool is known and used.

Data checked October 5, 2026. Star counts and dates change constantly.

Open-source solvers: free GTO study

Solvers calculate game-theory-optimal (GTO) strategies: how often to bet, check, call or raise in a given spot so that opponents can’t exploit you. They are the most powerful study tools in modern poker, and commercial versions are usually the most expensive.

TexasSolver

TexasSolver is the most popular open-source solver by a wide margin. It’s a desktop program that solves postflop situations in Texas Holdem and short deck, and its authors have long claimed performance comparable to well-known paid solvers.

Best for: players who want serious postflop study without paying for a commercial solver.

Real-world tip: start small. Use narrow preflop ranges and only one or two bet sizes. Large trees eat memory fast, and a modest home computer will choke on huge setups.

WASM Postflop

WASM Postflop runs entirely inside your web browser, so there’s nothing to install. Its author has suspended development, but the tool still works and the code remains available.

Best for: quick study on a laptop, or trying a solver for the first time.

Real-world tip: because development has stopped, don’t expect bug fixes. Treat it as a learning tool rather than something to depend on long term.

A note on fair play: using a solver or any real-time assistance while playing for real money is banned by almost every poker site. Solvers are for study between sessions, never during play.

Play and host poker for free

PokerTH

PokerTH is a full Texas Holdem game you can play against computer opponents or with friends online, and it’s one of the longest-running open-source poker projects. It’s still very much alive, with a new release in September 2026 and code updates as recently as October 5.

Best for: home groups who want a free, ad-free way to play together online with play chips, and beginners who want to practise against bots.

Real-world tip: because it doesn’t use real money, it’s a low-pressure place to test the blind structures and house rules you plan to use in a live home game.

Tools for developers and app builders

If you’re building a poker app, website feature, odds calculator or training tool, these libraries save months of work.

PokerHandEvaluator

A very fast hand-ranking library that supports 5- to 7-card hands and Omaha. It’s available in several programming languages, including a Python package, and was updated in 2026.

Best for: anyone who needs to rank millions of hands quickly, such as for equity calculators or simulations.

PokerKit

PokerKit is a Python library that simulates entire poker games: dealing, betting rounds, side pots and many variants beyond Holdem. Its latest release came out in September 2026, and it originated in an academic research group.

Best for: building a game engine, a training app or a hand-history analyser without writing all the rules yourself.

treys and OMPEval

Two smaller, older evaluators. Treys is pure Python and very easy to read, which makes it great for learning how hand evaluation works. OMPEval is a fast C++ evaluator and equity calculator. Neither has changed in years, but hand rankings don’t change either, so both still do their job.

Real-world tip: check the licence before shipping a product. OMPEval uses its own licence rather than a standard one, so read its terms carefully.

AI and research toolkits

OpenSpiel

OpenSpiel is a large research framework for game-playing algorithms, and it includes poker variants such as Kuhn and Leduc poker alongside dozens of other games. It’s the most popular project on our list and is still actively maintained.

Best for: students and researchers learning the algorithms behind poker AI, such as counterfactual regret minimisation (CFR).

RLCard

RLCard provides ready-made card game environments, including Texas Holdem, for experimenting with reinforcement learning. Updates have slowed since 2024, but it remains a popular teaching resource.

Best for: machine learning learners who want a gentle starting point with card games.

We’ve deliberately left out tools designed to play automatically on real-money poker sites. Running bots on those sites breaks their rules and can lead to banned accounts and confiscated funds.

How to choose the right free poker software

Practical tips before you download

Get it from the official source. Download only from the project’s own repository or official package listing. Copies uploaded elsewhere can be modified or bundled with malware.

Check activity, not just popularity. A tool with many stars but no updates for years may have unfixed bugs or not work on newer systems. Look at the last update date in the table above.

Understand the licence. Using these tools personally is fine. If you plan to build a commercial product or online service, licences matter. AGPL-licensed code, for example, generally requires you to share your own source code if you offer the software to users over a network.

Expect a learning curve. Many open-source tools assume some technical comfort. Read the project’s instructions first and be ready to experiment.

Give back if you can. Report bugs, improve the documentation or support the developers. These projects survive because the community keeps them going.

Final thoughts

You don’t need a big budget to access serious poker technology. Free solvers can teach you GTO concepts, open-source games let you play with friends without ads or fees, and developer libraries give app builders a reliable foundation.

The best open poker tools aren’t always the prettiest, but they’re transparent, free and built by people who love the game. Pick the one that fits your goal, download it from the official source, and spend your money on buy-ins instead.

FAQs

Bala Kumar

Founder of PokerClubGames.com and a Poker Researcher with 10+ years of experience in SEO, WordPress development, and gaming content strategy. Specializes in researching online poker sites, poker apps, tournaments, bonuses, and poker strategies. Experienced in poker platform reviews, affiliate marketing, and creating SEO-focused poker content for global audiences.

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