Is there a free alternative to Flopzilla?

Kongzilla is a free and open-source range and board analyser that covers the same loop as Flopzilla: enter a range, enter a flop, read what the range hits, then filter it down to the hands that continue. It runs in the browser, so there is nothing to install and no licence key.

Does Flopzilla work on Mac or Linux?

Flopzilla is a Windows program and needs Wine or a virtual machine elsewhere. Kongzilla runs in any modern browser, so macOS and Linux are first-class.

Is a browser range analyser fast enough?

The engine is written in Rust and compiled to WebAssembly. Board statistics recompute on every keystroke, and equity is enumerated exactly rather than sampled.

Kongzilla

A free Flopzilla alternative that runs in your browser

Kongzilla is an open-source clone of the analysis loop Flopzilla made standard: enter a range, enter a flop, read what the range actually hits, then filter it down to the hands that would keep going. No install, no account, no licence key, and nothing leaves your machine.

Open Kongzilla

What it does

Range matrix. 169 cells, paint with weights, text notation both ways (AKs+, 77-99, QJo), a percentage slider over a real hand ranking, and combo level suit selection.
Board statistics. The full ladder — straight flush down to no made hand, plus flushdraws, open-enders, gutshots, backdoors and the combination rows — recomputed as you type.
Filters. Mark which classes continue and the whole panel re-reads through them, or cut the range to its strongest share by equity, which keeps the draws a class ladder would fold.
Equity. Exact enumeration, range versus range or hand versus range, with a per-combo equity matrix and a distribution graph.
Flop statistics. How a range performs averaged over all 22,100 flops, and how often each kind of flop comes up.
Preflop charts. Solver ranges for 20–100bb tournament play, by seat and by spot.

How it compares

	Kongzilla	Flopzilla
Price	Free, MIT licensed	Paid licence
Install	None — it is a web page	Windows installer
macOS and Linux	Yes, natively	Wine or a virtual machine
Source code	Open, on GitHub	Closed
Offline	Yes — one HTML file you can keep	Yes
Your data	Never leaves the browser	Stays on your machine

Frequently asked

Is it really free?

Yes. It is MIT licensed and the whole engine is on GitHub. There is no paid tier and no account.

Does it work on a Mac?

Yes. Flopzilla is a Windows program; Kongzilla is a web page, so macOS, Linux, ChromeOS and tablets all work the same.

Can I use it offline?

Yes. Every release ships a single HTML file with the engine inside it — download it once, double-click it, and it runs with no network at all.

Is my range data sent anywhere?

No. The analysis engine is compiled to WebAssembly and runs inside your browser tab. There is no server to send anything to.