Slot-math expert · generate · edit · preview · export

Slot math that normally takes weeks — in seconds.

RTPly is your slot-math expert. Exclusive, complex math — reels, paytable, free spins, sticky wilds, multiplier ladders, jackpots — generated, 1,000,000-spin verified, and fully editable. Tweak any number by hand, preview live, manipulate the model, and export a drop-in bundle. One site. Advanced AI on top of a hardened slot-math engine.

No spreadsheets · No bespoke codebase · Math you can defend, edit, and ship in minutes

Seconds
from spec to verified math
1,000,000
spins verified per build
100%
of every number editable by hand
One site
generate · edit · preview · export
What is RTPly

The expert slot mathematician on your team.

Building slot math the traditional way means weeks (often months) of spreadsheets, a senior mathematician on retainer, and trial-and-error tuning that costs a small fortune. RTPly replaces that with a single, audited system: you describe the game, RTPly generates the full math — reel strips, paytable, free spins, sticky wilds, multiplier ladders, jackpots — verifies it over 1,000,000 spins, and hands you a config you can edit, preview, manipulate by hand, and export. Advanced AI does the creative drafting; a hardened math engine does the correctness.

🧠

Complex math in seconds

Exclusive, full-stack slot math — reels, paytable, free spins, sticky wilds, multipliers, bonuses, jackpots — generated end-to-end. What a senior mathematician would spend weeks on, you get while you sit there.

🎯

Math you can defend

Every number is computed analytically (exact closed-form) and cross-checked against a 1,000,000-spin Monte Carlo before it ships. No guesswork, no “looks about right”.

✏️

Edit any number by hand

Override the paytable, change a free-spin trigger, swap a reel symbol — every value is editable. The studio re-verifies on the spot and asks you to approve the new math before saving.

🎚️

Preview & manipulate live

Drag the RTP slider, switch volatility, regenerate a symbol — the running game hot-swaps without a reload, so you tune by feel, not by rebuild.

📦

Export a drop-in bundle

One click → a versioned, hash-stamped ZIP: one HTML file, the pinned runtime, the immutable math config and all assets. Drop it on any static host or aggregator iframe.

🛠️

One site, end to end

Generate, edit, preview, manipulate and export — no plugins, no spreadsheets, no separate engine to build. Advanced AI does the creative drafting; a hardened math engine does the correctness.

How it works

From a brief to ready-to-ship slot math

Five stages. You set the brief; RTPly generates the complex math, proves it, lets you edit and manipulate every value, then exports a self-contained game. The whole loop is one tab.

1

Brief

Pick a grid, paylines (or ways/cluster), volatility and target RTP, and choose how the win mix is delivered — how much of the RTP comes from the base game versus free spins, bonus and jackpots. Add a theme if you want themed art.

2

Generate the math

RTPly produces the full math model end-to-end — reel strips, paytable, free-spin trigger and value, sticky-wild contribution, multiplier ladders, jackpot tiers — analytically built and shaped to your brief. Advanced AI does the drafting; the engine does the arithmetic.

3

Verify & tune

The closed-form analytical engine computes the exact RTP and the per-feature split, then a 1,000,000-spin Monte Carlo verifies it. If the total or the mix is off target, RTPly tunes the right levers (trigger frequency, multiplier ladder, reel composition) and re-verifies — up to three times.

4

Edit, preview & manipulate

Drag the RTP slider, change volatility, hand-edit any paytable cell, regenerate a symbol — the running preview hot-swaps without a reload and every manual edit is re-verified before you save. Tune by feel, not by rebuild.

5

Export

One click bakes a versioned, hash-stamped bundle: index.html, the pinned runtime, the immutable math config and all assets. Self-contained and drop-in for any host or aggregator iframe.

The RTP engine

How RTPly auto-calculates return-to-player

Production slot studios don't tune RTP by trial and error — they build it by calculation and use simulation as a regression check. RTPly does exactly that, automatically, for every game.

ExactAnalytical engine

Computes the return-to-player in closed form — no approximation — in well under a second:

  • Per-payline expected payout by enumerating every symbol combination across the reels — exact, sub-millisecond.
  • Scatter pays by convolving each reel's "scatters in view" distribution — exact.
  • Free-spin trigger probability and value from that same distribution — the chance the feature fires and what it's worth.
  • Sticky-wild contribution via a Markov chain over effective wild density across the round.

ProofMonte Carlo verifier

The analytical answer is only trusted once the actual game agrees with it:

  • Runs the full engine — base game plus every feature — for 1,000,000 spins.
  • Decomposes realized RTP into base vs. feature contribution so the delivered mix is checked, not just the total.
  • Deterministic & seeded — the same config and seed always replay the same spins, so any result is reproducible and auditable.
  • Every config is content-addressed: a hash of its JSON is its immutable version.

The convergence loop

You don't just set "96%". You set how that 96% is delivered — say 60% from the base game and 40% from free spins. After the config is drafted, RTPly verifies it and, if the total RTP or the mix is off target, auto-corrects and re-verifies — at most three attempts.

1 · Draft
AI drafts the math; analytical engine tunes reel strips and paytable to the target — exact first.
2 · Verify
1,000,000-spin simulation measures the real total RTP and the real base/feature split.
3 · Correct
Off target? Adjust the right levers and loop back — like a slot designer would, not by brute force.
4 · Confirm
Within tolerance on total and mix → the config is stamped, hashed and shipped.
🎚️

It tunes like a designer, not a brute-forcer

To move more return into free spins, RTPly raises how often the feature triggers and steps the multiplier ladder — it never inflates the round to an unplayable length. Awarded free spins are capped at a sensible 25; base reel strips and the paytable are rebalanced analytically first, then proven by simulation.

🛡️

Honest when it can't converge

If three attempts can't hit the target, RTPly does not silently ship wrong math. It tells you exactly what was off, why, how to fix it, and how to retry — because in this domain, fairness beats convenience.

Feature library

The mechanics players expect — already parameterized

Each feature is a tested, audited runtime template with a typed configuration. The math engine fills in the parameters and proves them; you tune them live. No bespoke per-game code to audit.

🌀Free Spins

Trigger symbol & count, awarded spins, win multiplier and retrigger behaviour.

🧲Sticky Wilds

Wilds that lock in place for a duration on chosen reels, compounding over the round.

↔️Expanding Wilds

Wilds that stretch to fill a reel — direction and animation configurable.

✖️Multiplier Ladders

Random or sequential multiplier progressions attached to wins or spins.

🔻Cascading Reels

Winning symbols clear and refill, with an optional escalating multiplier ladder.

🎁Pick-em Bonus & Jackpots

Scatter-triggered pick mini-game with a prize table, plus tiered jackpots.

The core idea

Configs, not codebases

There is exactly one slot engine. Every "generated game" is a JSON config plus an asset bundle. That single decision is what makes the math auditable and the quality consistent.

Fix once, ship everywhere

An engine or rendering fix improves every game ever generated — no per-game maintenance debt.

Auditable by construction

The AI's only structured output is JSON validated against a strict schema. There is no generated game code to review.

Immutable & reproducible

Each math config is content-addressed and frozen. A seed + config replays a spin exactly — built for audit trails.

Isolated per workspace

Multi-tenant from day one with row-level isolation, so every project's data stays its own.

FAQ

Questions, answered straight

Is the generated math actually accurate?
Yes. Every value is computed in closed form by the analytical engine — exact for the modelled features — and verified by a 1,000,000-spin Monte Carlo before anything ships. A config only saves when both agree within tolerance on the total RTP and on the base/feature mix.
Can I edit the paytable and other numbers by hand?
That's the point. Every number is editable — paytable cells, free-spin trigger, awarded spins, multiplier ladder, jackpot probabilities, reel composition. The studio re-verifies on the spot over 1,000,000 spins and asks you to approve the new math before saving. Reject and your edits stay open so you can adjust.
How is this different from hiring a slot mathematician?
A senior slot mathematician will typically take 2–6 weeks per game and cost low-to-mid five figures, then hand you a spreadsheet you can't easily change. RTPly does the full build in seconds, gives you a live preview, lets you manipulate every value, and exports a runnable game. You stay in control of the math instead of waiting on someone else.
Do I need to write any code?
No. You set knobs in the studio; RTPly generates the math, audio, and a playable game. The export is a static bundle you can host anywhere — no build step.
What grids and features are supported?
Paylines (3×3 → 6×4), cluster pays (5×5, 6×5, 7×7), and ways pays (5×3-ways = 243, 6×4-ways = 4096). Features: free spins, sticky and expanding wilds, multiplier ladders, cascading reels, pick-em bonus and jackpots.
What do I export, and is it self-contained?
A versioned ZIP with an index.html, the pinned runtime, the immutable math config and all assets, plus a manifest with the config hash. Drop it on any static host or an aggregator iframe — it just runs.
Is this for real-money gambling?
RTPly targets social and sweepstakes-style games. The architecture is built so a regulated mode (certified RNG, formal math reports) can be enabled later, but real-money operation is not part of the current product.

The math expert that fits in a browser tab.

Generate exclusive, complex slot math in seconds. Verify it over a million spins. Edit any number by hand. Manipulate it live. Export a self-contained game. All in one place.

Open the Studio →