How GrindSense works

Create a free account, then pick how you want to play:

• Practice — a single-player table you fully control: number of opponents, their styles, blinds, and stacks.
• Arena (live lobby) — 24/7 tables already running with AI players. Watch any table, or take an open seat and jump in.
• Tournaments — multi-table events with a rising blind structure, automatic table balancing as players bust, and payouts by finishing place.

Eight archetypes, and they are not hand-tuned guesses. Each one's VPIP (how often it voluntarily puts money in before the flop) and aggression are calibrated against 2,351 real players from a large hand-history database, so each sits at a genuine percentile of a real 6-max field rather than at a number someone thought felt about right.

Tap any opponent at the table to see how to play against them.

When it's your turn, your options (fold / check / call / bet / raise) appear — only the legal ones. A few things that speed you up:

• Bet presets — ⅓, ½, ⅔, and full-pot buttons size your raise instantly.
• Pot odds on the call button — it shows the equity you need to make a call profitable.
• Keyboard — F fold, C check/call, R prime a raise then Enter to confirm.
• A countdown ring appears on the acting player at live tables.

Every AI decision comes with a plain-language explanation of why — the hand strength, pot odds, position, and read it's acting on. Crucially, the reasoning is honest: when a bot is bluffing, it says so, and often tells you which of your leaks it's exploiting. Read these to understand how strong players think through a spot.

Coaching is woven through the app, not buried in a menu:

• HUD stats — VPIP, PFR, 3-bet%, aggression, and more, tracked across sessions.
• Leak detection — flags patterns like playing too many hands or over-folding the river, with how to fix each.
• Post-hand tip — a one-line lesson after hands where you slipped.
• Session recap — hands played, net chips, biggest pot, and your top leak when you finish.
• Analytics — how your stats move over time, by position and by street.
• Homework — the app picks what to work on next, based on what it has actually seen you do.

Focused reps on one decision at a time, graded against a reference answer:

• Preflop ranges — should this hand be opened from this seat?
• Short-stack shove/fold — the push-or-muck decisions that decide tournaments.
• ICM bubble — where chips stop being worth their face value.
• Equity quiz — how often does this hand actually win?
• C-bet spots — continuation betting on boards that do and don't suit you.
• 3-bet pots — playing the bloated pot you just created.
• River decisions — the street with no cards left to save you.

The Ranges page shows the same 13×13 opening chart the preflop drill grades you against, so the reference you study and the answer key you are marked against are never two different things.

• Replay — step back through any hand you've played, card by card and action by action.
• What if? — take the decision that cost you chips, change it, and watch the same hand play out from that fork with everything else identical.
• Share a hand — send a replay link to a friend.

• Rival ladder — a gauntlet of house bots climbed one archetype at a time, weakest first. You clear a rung by holding a win rate across your recent hands, not by running hot for one session.
• Ranks — Rookie through Crusher and High Roller, earned on results over time.
• Achievements & daily challenges — targets that reward playing well rather than simply playing a lot.
• Bankroll — tracks your roll and recommends the stakes it actually supports.
• Leaderboard & friends — ranks players, bots included.

• Sit in — take an open seat at a running table; your buy-in comes from your chip balance.
• Rebuy — bust out? Rebuy for the buy-in and keep playing.
• Sit out / I'm back — skip hands without losing your seat.
• Waitlist — table full? Join the queue; you're only charged when a seat actually opens, and you'll get a "take my seat" prompt.
• Watch — spectate any table (and chat) without sitting down.

Every hand commits a 256-bit seed before a single card exists, and the deck is shuffled from that seed with SHAKE256 — the extendable-output function from the SHA-3 family — using Fisher-Yates and rejection sampling, so no card and no seat is even slightly favoured.

The shuffle is checked with the batteries used to test random number generators generally: dieharder's Diehard suite, NIST SP 800-22, and TestU01. Not only the underlying random source, but the dealt permutations themselves — a shuffle can be broken while its random source is perfect, so the cards are tested as cards.

This is not a gambling certification and does not claim to be. GrindSense is play-money and no regulator is involved. The testing exists so the question has an answer.

Your profile tracks lifetime stats and chip balance. Forgot your password? Use the reset link on the sign-in page. New to a term? The in-app Glossary defines it. You can delete your account from your profile at any time — see the privacy policy for what that removes and when.