Questions, answered.

MythLayer is a single-file HTML overlay tool for tabletop dungeon masters. It runs fullscreen on top of a battlemap image or video (usually displayed on a TV, projector, or table-mounted screen) and lets you drop animated spell effects, area templates, distance measurements, scene tints, and dice rolls onto the map in real time from a right-click radial menu.

It's built for in-person games where players sit around a physical table with miniatures, and the DM wants the visual punch of a virtual tabletop without turning the session into a remote-play setup.

Three steps:

1. Open the HTML file in desktop Chrome on a laptop near your battlemap display.
2. Load a battlemap image or video (drag and drop, or use the file picker).
3. Right-click anywhere on the map to bring up the radial menu and start placing effects.

That's it. There's no setup, no account, no install, no configuration files. If you can right-click, you can use MythLayer.

No. MythLayer is one HTML file (378 KB total). You double-click it and it opens in your default browser. No installer, no package manager, no dependencies, no admin rights required.

It's not a web app on a remote server either — it runs entirely from the local file. You can email it to yourself, drop it on a USB stick, or save it to your desktop. Wherever the file goes, the tool goes.

Yes. The tool runs in any modern Chrome-family browser (Chrome, Edge, Brave, Arc, Chromium) on any operating system. Mac and Linux DMs use it without issue.

Firefox and Safari should also work but get less testing — if you hit a quirk on either, please report it on the Discord.

Primary target: desktop Chrome. Tested heavily there.

Also works on: Microsoft Edge, Brave, Arc, Chromium — all Chrome-family browsers behave identically.

Lightly tested: Firefox and Safari — known to work but may have small visual differences.

Not supported: mobile browsers. The tool needs the screen real estate and right-click interaction model that desktop browsers provide.

Absolutely. While the area templates are calibrated to fifth edition's sizes by default, everything else is system-agnostic. The radial menu, spell effects, distance measurement, scene tints, dice, and scene objects work for Pathfinder, Call of Cthulhu, Savage Worlds, Mörk Borg, Shadowdark, OSR retroclones, homebrew systems — anything that uses a battlemap.

For non-5e games with different area sizes, just measure distances by hand using the distance tool and place effects to match.

Yes. Once the HTML file is on your machine, it runs entirely offline. No internet connection required. No server pings, no telemetry, no analytics.

This matters if you play in basements, cabins, or game stores with bad Wi-Fi — MythLayer doesn't care.

One-time payment on itch.io. The current price is listed on the itch page — itch lets you set a higher amount than the minimum if you want to support the project beyond the base price.

No subscription. No upgrade fees. No "Pro" tier locked behind another paywall. You buy it once, you own it.

One file: mythlayer.html. That's the entire tool. All current features, every effect, the full radial menu, calibration, dice, spell circle, the works.

Plus: every future update at no extra cost. When new versions ship to itch, you can download the new build from your itch library.

No. Every update is included in your one-time purchase, forever. The roadmap page lists what's planned — when those features ship, you'll get them at no additional charge.

itch.io's standard refund policy applies — refund requests within a reasonable window are honored. But the better path: try the demo first. The free in-browser demo has the same radial menu, the same fire effect, and the same distance tool as the full version. If the demo works for your setup, the full version will too.

The license is per-DM. If you DM and your players never touch the tool, one copy is enough. If multiple people in your group take turns DMing and each wants their own copy, the friendly thing is for each to buy a copy (it's a small price, and it directly supports continued development).

That said: the file is unlocked HTML. No DRM, no activation, no phone-home check. It works on trust.

MythLayer is sold as a personal-use tool. Buying gives you a perpetual license to use the tool for your own tabletop games, including streaming or recording your games.

What's allowed: Personal use, home games, online streaming/YouTube of your sessions where MythLayer is on screen, recording for your group's archives.

What's not: Reselling the file, distributing modified copies, bundling MythLayer into another paid product, or claiming the work as your own.

If you have a specific use case that doesn't fit neatly into either bucket (a game store running MythLayer at organized play, a charity stream, an educational program), reach out via the Discord and we'll work something out.

Yes — for your own personal use. The file is unminified, the JavaScript is readable, the CSS is documented. Tweak colors, change defaults, add a custom slice if you know your way around the code. That's all fine.

What's not fine is redistributing your modified version. Keep your changes for your own table.

No. No analytics, no telemetry, no usage tracking, no error reporting, no anything. The tool doesn't make a single network request after the page loads — and even the page load is purely local files.

The mythlayer.com website itself also runs without analytics or cookies. No tracking pixels, no third-party scripts.

Only your local settings, and only in your own browser's local storage:

• Your calibration scale (so it persists between sessions)
• Your settings preferences (animation intensity, cursor size, etc.)
• Your dice roll history (the last several rolls, for reference)

None of this leaves your machine. None of it is sent anywhere. If you clear your browser data, the settings reset and start fresh.

Never. When you load a battlemap, it's loaded directly into the browser from your local file. The image data never touches the network. Your maps stay on your machine.

Report it on the Discord. There's a bug-report channel. Include what you were doing, what you expected, what happened instead, and ideally a screenshot or screen recording.

Confirmed bugs get fixed in the next patch release. Major bugs get hotfixed faster.

Yes — see the roadmap for what's planned. MythLayer is actively developed by one person. Releases ship when features are ready, not on a fixed schedule, but the project is alive and the roadmap reflects real intent.

Discord. There's a feature-request channel. The roadmap is shaped by what real DMs ask for at the table — if you've got a use case the current toolset doesn't cover, that's exactly the feedback that matters.

A few ways:

• Tell other DMs. Word-of-mouth is everything for a niche tool like this.
• Share clips. Tag MythLayer on social if you record cool moments — it helps a lot to have visible proof of the tool in action.
• Leave a rating on itch. Positive reviews are the most useful single thing a buyer can do.
• Stay in the Discord. Active feedback shapes the roadmap.

That's it. There's no Patreon, no donation jar, no premium tier. Buying the tool and telling people about it is the whole support model.