Solve Privately. On Your Machine.

5-card and 6-card PLO, Big O, Hold’em and Short Deck. Stand Up (Nit) Game, Squid and Double Board Bomb Pots. MTTs with ICM, Bounty Tournaments and 4-way postflop spots. Built for speed and accuracy.

Get HydraSolver Open HydraViewer

Not ready for a solver? Start in your browser with HydraViewer — our web-based study tool & trainer.

The Solve and Study workspace during a 6-card PLO flop solve, with run controls and the board on the left and three action columns of hand classes on the right.

Solve & Study — a 6-card PLO flop mid-solve: every hand class under Check, Bet 33% and Bet 75% with its frequency, EV in big blinds and combo count.

The same solve shown as a grid of hand classes by suit shape, each cell a bar split between check and the two bet sizes.

Chart View shows rows by hand class and columns by suit shape.

The hand chart in dark theme, the same figures on a dark background.

Switch the entire GUI to Dark Mode.

The Export strategy dialog over the solve, offering .hdv, .txt and .json with options for per-hand EVs, zero-frequency hands and file layout.

Export an entire street to HDV (for HydraViewer), TXT files, or JSON — with per-hand EVs included.

The Trainer: a flop on the felt with the hand dealt to the Button, three action plates underneath and the graded answer below them.

A built in Trainer deals hands from a solved sim and grades the actions you pick on EV.

The Session history dialog listing hands played with their grades and the EV lost, above a breakdown by street and spot type.

Session history shows every hand you played in the trainer for easy review.

The Help Center panel open beside the Build Tree workspace, listing topics, with a guided tour step shown over the tree.

The integrated Help Center opens along-side your workspace.

The Tree Wizard dialog: game, stakes and table on the left, and an example hand with the spots it produces on the right.

Tree Wizard helps you build sims quickly. An example hand is written as you go.

The Side games dialog with Squid selected, showing squids left, what each seat holds and the penalty per squid.

Stand Up (Nit) Game and Squid Game with customisable penalties.

The Rake dialog offering no rake, online and live cardroom structures or custom rules, with the percentage and cap in big blinds.

Choose from common rake structures or input your own.

Tournament settings with ICM multi-table selected and progressive bounties on every seat, beside the Payout structures dialog with its preset ladders and a builder.

Final Table, Multi-Table ICM, PKOs and Mystery Bounty.

The Batch Sims workspace: seat ranges and a board list on the left, stop rules and output files on the right.

Batch Sims, run a set list of flops, turns or rivers — single or double board.

What it solves

Built for the Next Generation

Build the tree, solve it, study it and train on it, all in one place. HydraSolver adapts to the game you're playing. Add a straddle, antes, bounties or a second board. Learn how you should adjust to beat variants like Stand Up (Nit) Game or Squid Game.

Pot Limit Omaha
6-card PLO
5-card PLO
Big O
PLO 8
Limit Hold’em
Limit Omaha
Omaha 8 or Better
NL Hold’em
Short Deck
ICM
Bounty Hunter
Mystery Bounty
Bomb Pot
Double Board
Squid Game

Tournament EV

Payouts, players left, stacks and future game all feed the algorithm, so a double-up is valued in real money, not chip count.

PKO and Mystery Bounties are not just solved for the bounty itself. Payout structure, envelopes remaining and chips-per-dollar are all inputs HydraSolver uses to produce the best solution.

Crush your private games

Antes, straddles, double straddles, button straddles, bomb pots, double board, Stand Up Game, Nit Game, Squid Game. Solve every variation, including minimum VPIP strategies.

Rake is configurable and saved with the run.

Lock a strategy, then attack it

Lock the frequencies your opponents actually play, at any node on any street. HydraSolver solves around it, so you can study what beats the population — not just equilibrium.

Lock frequencies in postflop spots and see how it changes the optimal preflop strategy.

In the app

Integrated Help Center

We guide you through building a sim, running it and exporting strategies. HydraSolver's built-in Help Center covers getting started, tournaments, side games and reading strategies.

Tree builder

Positions, stacks, antes and bet sizings, street by street. Write sizing rules once (RFI, 3BETISO, FLOP.CBET.3BP, sizes like 3x+1bb), save them as presets and apply them to the whole tree. Undo and redo as you go. The integrated Tree Wizard makes things easier.

Solve postflop from a preflop solve

Open a preflop solve, browse to any flop situation and click New postflop sim. Player ranges are imported automatically — no need to export or copy/paste. Batch sims and set it to run multiple different flops, turns or rivers.

Solve on your terms

Auto-stop exactly when exploitability, convergence or volatility metrics hit your goal, so each board in a batch is consistent — useful for aggregate reports. Set maximum CPU threads and RAM if you have other things running, so HydraSolver uses the exact resources you want it to.

Choose how you read the strategy

In List View, you see every hand with frequency and EV. Switch EV mode to Chips, BB, % of Pot or $EV for tournaments. Filter with common syntax ($ds, AA, KK8x), group or expand combos, sort any column.

In Chart View, you see the standard hand grid for Hold’em — mouse over hands for specific combos — and the chart updates for PLO4/PLO5/PLO6 to give you an easy-to-read breakdown of different hand classes and suitedness.

Built-in Trainer

The HydraSolver trainer reads .hdr and .hds files (not .hdv — that’s HydraViewer). It intelligently deals common spots you need to train more often — first. It grades each decision by EV, tracks your accuracy, current streak and EV lost, and keeps a session history so you can review your mistakes later.

Save or Export

Save a complete solve as .hdr to resume solving later. Save 1 or 2 streets as .hds (smaller file size but non-resumable) to study or train later. Export an entire street as .hdv (to use in HydraViewer) or as TXT files or machine-readable JSON. Change the format to PPT, Pio, CSV, .p4rg, or a template you define.

See Full Feature List →

What it needs

System requirements

Three numbers matter: how much RAM you have, how much free disk, and which OS you run. RAM decides what you can solve — more players, deeper stacks and more hole cards each cost memory. Cores only decide how fast it finishes.

Desktop OS

Windows 11 or Server 2022+, 64-bit

HydraSolver is a Windows desktop application. It installs to Program Files (one administrator prompt). Need a remote box instead? See server rental.

RAM (memory)

32 GB minimum

128 GB+ recommended

Disk space

500 GB free to install and run

App + abstraction maps ~450 GB
Working room while solving ~50 GB
Saved solves (yours to keep) extra

Rough RAM by tree

These figures are approximate — coarser settings use less, finer settings use more. Hit Size in Build for the real number on your tree before you start.

Your RAM	Comfortable	Stretching it
32 GB	3-way NL / PLO	Heads Up Postflop
128 GB	Bomb Pots	4-max PLO5 / PLO6 Preflop
512 GB+	6-max PLO5 / PLO6 Preflop	Deeper Stacks / Multiple Bet Sizing’s

The Detail setting trades memory for accuracy, so the same tree costs more RAM on High and less on Standard. Need more than your desktop has? Rent a server →

License

Buy HydraSolver

HydraSolver

$899

Dual · 2 machines — $1,299

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How do I run solves?

HydraSolver ships with an integrated Help Center. You'll learn everything from the basics (getting started, building trees) to node-locking ICM solves like a GTO crusher.

Looking for something that opens in a browser instead?

Open HydraViewer →

HydraViewer

Not ready for the full solver?

Start in your browser, today

HydraViewer is where ranges exported from HydraSolver get read. Nothing to install, nothing to solve. Open it and the strategy is on the screen.

It is also the sensible way in if a full solver is more than you need right now. Browse .hdv packs on HydraViewer, load one in the browser, and study without a license or a solve of your own.

Opens ranges you export from HydraSolver.
Runs in the browser, on a laptop or a phone.
Packs load in the browser — no install to read them.

Open HydraViewer →

Which one do I want?

HydraViewer .hdv	Read a solved spot in the browser. No install, no license, nothing to configure. Start here.
HydraSolver .hdr / .hds	The finished solve itself, opened in HydraSolver. Every node, every EV, resumable. Needs a license.
HydraSolver your own solves	Build and solve whatever spot you want, on your own sizings. Needs a license.

Questions

Common questions

HydraSolver vs HydraViewer — which do I want?

HydraSolver is the desktop software that builds and solves trees. HydraViewer lets you study solved strategies in the browser. You can export a .hdv from HydraSolver and open it there.

What do the licenses cover?

Full private use of HydraSolver, all game maps and updates for 1 year. A Single License activates 1 machine; you can change computers up to 3 times per month. A Dual license allows you to open / run solves on 2 machines at the same time.

Do I need HydraSolver to open an HDS Shop solve?

Yes. .hds files open in HydraSolver, so you need a license. To study in the browser without one, get a .hdv pack for HydraViewer.

Is there a free trial?

No. You can get started with Free HDVs in HydraViewer — the web-based strategy viewer and trainer for HydraSolver exports.

What happens when the year runs out?

The solver becomes read-only. You can still open, browse, train, and export your existing solves. You cannot start a new solve until you renew.

Can I move it to a different computer?

Yes, on either license. Release the activation from Settings → License on the old machine, then activate the new one with the same license id. A Single license holds one activation at a time and a Dual holds two, so a Dual can simply run on both. Releases are for real moves: three per 30 days on a Single, four on a Dual. An activation that sits idle for 120 days frees itself, and support can clear a seat if a machine dies before you release it.

If I purchase a Dual license, is there any expiry on activating the 2nd one?

The Dual license comes bundled as one license, same start (day of purchase) and end date.

What hardware do I need?

Windows 11 (or Server 2022 and newer), 64-bit. You need 32 GB of RAM at a minimum, and 128 GB or more is recommended. Plan on about 500 GB of free disk to install and run, plus room for saved solves. See System requirements for what fits at each RAM size.

Do I have to rent a server?

No. HydraSolver runs on a normal desktop. Renting a server is optional if you need more RAM or cores.

How do I download the app?

After you buy a license, the download is available immediately. You will receive an email with your license ID. Paste it inside the HydraSolver software — Settings → License — then hit Refresh to activate.

How do I learn the app?

HydraSolver has a Help Center with searchable guides for building solves, reading strategies, and training.

Can I pay with Bitcoin?

Yes. You can pay by card or Bitcoin at checkout.

Contact

Get in touch

Questions about a license, a solve, or a server? Send a note and we will reply to your email.

Buy a license,

then rent a server if your desktop isn't enough — we will set up HydraSolver on a Remote Desktop, ready for you to connect

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