Solve Poker. On Your Desktop.

NL Hold’em, 4 / 5 / 6-Card Omaha, PLO8, Big O, Short Deck, Stud, Razz, 2-7 and A-5 Draw and Badugi. Stand Up / Squid Game, Double Board and Bomb Pots. Tournaments with Future Game ICM, Satellites and Bounties. Multi-way Postflop and more. Accuracy, measured and published.

Get HydraSolver Published Proofs

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

The Solve and Study workspace on a solved 3-way 5-card PLO flop, J♥8♣5♠: the small blind has checked and the big blind bet half pot, and the button’s hands are listed under Fold, Call and both raises, each with its frequency and EV.

Solve & Study — a solved PLO5 flop: every hand the button holds facing a half-pot bet, under Fold, Call and both raises, with its EV.

The same spot as a grid of hand classes by suit shape, each cell a bar split between fold, call and the two raises: the button folds 49%, calls 34% and raises 17%.

Chart View groups Omaha by hand class and suit shape, so the whole range fits on one screen — here the button’s, facing the bet.

The big blind’s turn chart on J♥8♣5♠9♦ in Dark Mode: it checks 88% and bets pot 12%.

Switch the whole app to Dark Mode — here on the 9♦ turn, with the big blind to act.

The Trainer on the flop: the button holds 8♥8♦9♠T♠K♥ facing the small blind’s half-pot bet, four answer plates with each action’s frequency and EV, the verdict Best, no EV lost, and the whole range’s mix below.

The Trainer deals spots from your solve and grades every answer by the EV it cost — here 8♥8♦9♠T♠K♥ calls: Best, no EV lost.

The Trainer’s Session history: 11 hands, grade 75, where the EV goes by street and spot type, and every hand with its verdict and the EV it cost.

Session history keeps every hand you played in the Trainer — its verdict, the EV it cost, and where the EV goes by street and spot type.

The cutoff’s preflop chart at a 4-handed bounty final table, with the ICM KO Risk panel open: each seat’s equity in dollars, a matrix of risk factors and one of risk premiums. KQo’s card on the right: raise, worth $38.03.

ICM KO Risk on a 4-handed bounty final table: what each stack is worth in prize money, and the risk factor between every pair of seats.

The Aggregate report over the Batch Sims workspace: five 3-way PLO5 flops, each with its weight, texture and how often the small blind checks, bets half pot or bets pot, sorted by the half-pot bet, then the weighted, unweighted and texture averages.

Batch Sims solves one spot across as many flops as you choose, then sums them up in an Aggregate report — here 5 flops, by weight.

Seven Card Stud heads-up from 3rd street: the bring-in, with the 3♣ door, facing the K♠’s completion — fold 41%, call 39%, raise 20% — on a chart of its two down cards, with A3s’s card open on the right.

Seven Card Stud, Razz, Stud Hi-Lo, High-Low Chicago and Five Card Stud — here the bring-in’s answer to a completion.

2-7 Triple Draw heads-up: the big blind’s first draw after calling the button’s raise, by hand class — draw two 34% and three 55% overall.

2-7 and A-5 Triple, Double and Single Draw, Badugi, Badacey and Badeucey — here how many cards the big blind draws with each kind of hand.

The Tree Wizard on the Flop step of a 4-max PLO5 tree at 50bb: bets of 50% and 100% pot, raises of 50% and 100% and a 100% re-raise, with the example hand and the Spots checklist on the right.

The Tree Wizard builds the whole tree from a few choices, street by street, and writes an example hand as you go.

Settings with the Side games dialog open on Squid: 2 squids left, each seat’s squids held and a penalty of 3 bb per squid.

Stand Up (Nit) Game and Squid, with your own penalties — every EV includes the side-game money.

The Rake dialog: no rake, online low and high stakes, live cardroom drop and custom rules, with Online · high stakes, 5% up to 1 bb, selected.

Choose a common rake structure — online or live cardroom drop — or enter your own rules. Here 5% up to 1 bb.

The Export street strategy dialog over the hand chart: the flop, the file formats — HDV, TXT, JSON and CSV — and the option to include per-hand EVs.

Export a whole street as HDV (for HydraViewer) or JSON, with per-hand EVs included — TXT and CSV too, in hold'em and four-card Omaha.

The Help Center open on the Tournament mode topic, its Satellites step beside a satellite set up in Settings: a seat at 100,000 chips worth $1,050.

The built-in Help Center opens beside your work — here the Satellites step, next to a target stack satellite.

Play Intro Video

What it solves

Built for the Games You Play

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.

Tournament EV

Chip EV, ICM, Future Game and Satellite (Target Stack). Payouts, players left and stacks all count, so a double-up is valued in prize money, not chip count.Future Game looks ahead round the table, so the blinds still to come, position and stack sizes are priced too. A target stack satellite prices every chip as a share of a seat.

PKO, Jackpot PKO and Mystery Bounties are solved with the payouts, the envelopes left and your chips per dollar.

Crush your private games

Antes, big-blind antes, straddles, double straddles, button straddles, button blind, bomb pots, double board, Stand Up Game, Nit Game, Squid Game. Solve every variation.

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.Preflop and on a sim’s first street, lock the exact hands a seat plays instead, from a range or a file. Hold’em and Short Deck add a hand chart to paint them on.

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 Wizard

Pick the game, the table, the stacks, who can limp and call, and the bet sizes street by street. The Tree Wizard builds the whole tree, and Update this tree changes it later.Bet Sizing Studio saves sizing rules as presets — RFI, 3BETISO, FLOP.CBET.3BP, sizes like 3x+1bb — and applies them to the whole tree. Undo and redo as you go.

Solve postflop from a preflop solve

Open a preflop solve, browse to any flop and click New postflop sim. The ranges come with it, so there is nothing to export or paste.

Batch Sims

Run one spot on 10, 25, 100 or all 1,755 flops, on every turn or river, or on your own boards. One aggregate report sums them up by texture and by the card that came.

Solve on your terms

Auto-stop when exploitability, convergence or volatility reaches your goal, so every board in a batch stops at the same standard. Set the threads and RAM HydraSolver may use if you have other things running.

Read the strategy your way

List View shows every hand with its frequency and EV. Chart View shows the 13×13 grid for Hold’em and groups Omaha by hand class and suit shape, with nut hands, sets, wraps, nut flush draws and a Blockers view.Filter with common syntax ($ds, AA, KK8x), group or expand combos and sort any column. Paint the chart by action mix, EV, weight or equity. Show EV in chips, bb, % of pot or $ in tournaments.

Compare and Preflop Overview

Compare a spot with another spot, or with the same spot in another solve, and the chart shows how each hand’s play changed. Preflop Overview shows every position’s preflop strategy on one page.

Built-in Trainer

The Trainer deals spots from your solves and grades each decision by the EV it cost. It tracks your accuracy, streak and EV lost, and keeps a session history so you can review your mistakes.It reads .hdr and .hds solves. .hdv files are for HydraViewer, which has its own trainer in the browser.

Save or Export

Save a whole solve as .hdr to resume it later, or a smaller .hds snapshot to study and train. Export a street as .hdv for HydraViewer, or as TXT or JSON.A .hds keeps 1, 2, 3 or all streets and cannot resume. Change the TXT format to PPT, Pio, CSV, .p4rg or a template you define. 5- and 6-card Omaha streets export as .hdv and JSON.

Help Center

Searchable guides for every screen, from your first tree to node-locked ICM solves. Click any “?” in the app for the short version.

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 10 or Server 2016+

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

RAM (memory)

16 GB minimum

128 GB+ recommended

See the tables below for what each game needs.

Disk spaceThe maps and the Study scratch file can live on any drive: Move maps… copies them to a folder you pick.

490 GB free for every game

Hold’em, Short Deck, Stud and Draw 5 GB
PLO4 and Hi-Lo 45 GB
PLO5 and Big O 235 GB
PLO6 175 GB
Working room while solving ~30 GB
Saved solves Extra

* You only need room for the games you play

RAM by game

What one sim needs, from HydraSolver’s own estimate, rounded up: preflop trees 100bb deep at Standard detail; postflop sims at an SPR of 10 and High detail, flop sims with full ranges, turn sims with the top 50% of hands and river sims with the top 25%. Turn / River gives the larger of the two.

Game	Preflop			Flop			Turn / River
Game	Heads-up	6-max	9-max	2-way	3-way	4-way	2-way	3-way
NL Hold’em	5 GB	80 GB	790 GB	5 GB	5 GB	10 GB	5 GB	5 GB
Short Deck	5 GB	80 GB	790 GB	5 GB	10 GB	25 GB	5 GB	5 GB
PLO4	5 GB	135 GB	1,040 GB	5 GB	20 GB	75 GB	5 GB	5 GB
PLO4 Hi-Lo	10 GB	260 GB	1,880 GB	5 GB	15 GB	65 GB	5 GB	5 GB
PLO5	5 GB	210 GB	—	5 GB	35 GB	160 GB	5 GB	10 GB
Big O	10 GB	365 GB	—	10 GB	35 GB	165 GB	5 GB	5 GB
PLO6	5 GB	515 GB	—	10 GB	55 GB	280 GB	5 GB	10 GB

Stud and draw solve the whole hand, at the bets each screen starts with.

Game	Whole hand
Game	Heads-up	3-way
Seven Card Stud	5 GB	15 GB
Stud Hi-Lo	5 GB	25 GB
Razz	5 GB	5 GB
High-Low Chicago	5 GB	35 GB
Five Card Stud	5 GB	5 GB
2-7 Triple Draw	5 GB	—
2-7 Single Draw	5 GB	—
2-7 Double Draw	5 GB	—
A-5 Triple Draw	5 GB	—
A-5 Single Draw	5 GB	—
A-5 Double Draw	5 GB	—
Badugi	5 GB	—
Badacey	5 GB	—
Badeucey	5 GB	—

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

Buy Now Pay with Bitcoin 10-Day Trial — $150

On a trial? Upgrade it instead: you keep your license id and pay only the difference.

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

Solve Poker. In Your Browser.

Not ready for the full solver?

HydraViewer opens solved spots in your browser, on a laptop or a phone. Nothing to install: start with the free HDVs, or pick a pack from the HDV Shop.

Opens the ranges you export from HydraSolver.
Study and train in the browser — no license needed.
Your files are read in the browser and stay with you.

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

Which games can HydraSolver solve?

No-Limit and Limit Hold’em, Short Deck, 4-, 5- and 6-card PLO, Big O and PLO8, heads-up to 9-max with multiway postflop, plus bomb pots, double boards, the Stand Up (Nit) Game and Squid, and tournaments with ICM, Future Game, target stack satellites and bounties. In beta: Seven Card Stud, Razz, Stud Hi-Lo, High-Low Chicago and Five Card Stud, heads-up or three-handed, and 2-7 and A-5 Triple, Double and Single Draw, Badugi, Badacey and Badeucey, heads-up.

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 Hold’em or Omaha solve as a .hdv from HydraSolver and open it there.

Is there a free trial?

You can try the full version of HydraSolver, unrestricted, for 10 days — just $150. The trial can be upgraded to Single or Dual for the difference at any time. You can also get started with Free HDVs in HydraViewer — the web-based strategy viewer and trainer for HydraSolver exports.

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 30 days. 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.

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 & Downloads 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. If the old machine died, press Refresh on the new one and release the old machine from the list it shows. An activation that sits idle for 120 days frees itself.

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 10 (or Server 2016 and newer), 64-bit. You need 16 GB of RAM at a minimum, and 128 GB or more is recommended. Plan on about 490 GB of free disk for every game: 5 GB for Hold’em, Short Deck, Stud and Draw, 45 GB for PLO4 and Hi-Lo, 235 GB for PLO5 and Big O, 175 GB for PLO6 and about 30 GB of working room while solving, plus room for saved solves. You only need room for the games you play. See System requirements for the RAM each game needs.

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 & Downloads — 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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