Privacy
Last updated 29 October 2026.
This page explains what crumbsim.com and the CRUMB apps keep about you, why, and what you can ask for. CRUMB and crumbsim.com are made and run by Michael Bushell in the United Kingdom, who is responsible for your data. There are no adverts, no analytics and no tracking cookies.
If you only read the site
Reading the guide, the roadmap or the tracker needs no account, and the site keeps nothing about you. Like any website, the hosting provider (Cloudflare) briefly logs each request, including your IP address, to keep the site running and secure. Fonts and everything else on the pages come from crumbsim.com itself.
If you sign in with Steam
You sign in on Steam's own page, so crumbsim.com never sees your Steam password. Steam tells the site your SteamID, and the site then asks Steam for your public profile name and picture, and whether your account owns CRUMB. It keeps:
- your SteamID, profile name and profile picture link, so your reports and comments show who wrote them;
- whether you own CRUMB, because only owners can post, vote and comment;
- when you first signed in and when you were last seen.
Signing in sets one cookie, crumb_session, which keeps you signed in for up to 30 days. It holds your SteamID and a signature, nothing else. Signing out removes it.
If you report a bug, suggest a feature, vote or comment
- Public: your report's title and description, the CRUMB version, system and area you chose, your comments, your profile name, and any screenshots you attach. Anyone can read these.
- Private: log files and circuit files you attach. Only you and the CRUMB developer can download them. Logs can contain folder paths from your computer, which may include your user name.
- Votes: the site records what you voted for, so you can't vote twice. Only the total is shown.
- Spam protection: the report form runs Cloudflare Turnstile, a check that you're a person, not a bot. The site also counts how many reports, comments and votes you make each day, to enforce daily limits, and forgets each count after two days.
Report a bug inside CRUMB sends the same things: the title and description you write, the CRUMB version and system, the circuit you have open, and the end of CRUMB's log. It proves who you are with a one-time ticket from Steam, so you don't sign in separately.
The CRUMB apps
- CRUMB on phones and tablets doesn't collect any personal information.
- CRUMB and CRUMB Advanced on Steam have no adverts, analytics or tracking. They use Steam for your purchase, the Workshop and other Steam features, which Valve's privacy policy covers, and they only send anything to crumbsim.com when you use Report a bug, as described above.
- A simulated board online: when a sketch on a simulated ESP32 connects to the internet, the connection runs from your computer to the addresses the sketch names, just as a real board's would.
Why the site keeps this
To run the tracker you asked to use, and to keep it free of spam. Nothing is sold or shared for marketing. The data is used only to understand and fix problems in CRUMB, and to show the reports and comments you posted.
Who else handles it
- Cloudflare hosts the site, stores its data and attachments, and runs the Turnstile check.
- Valve (Steam) runs sign-in and answers the profile and ownership questions above.
How long it is kept
Reports, comments and attachments stay for as long as the tracker runs, because they are the history of how CRUMB was built and fixed. Your account details stay while your posts do. Daily activity counts go after two days.
What you can ask for
You can ask for a copy of what the site holds about you, for something to be corrected, or for your account, reports, comments and attachments to be deleted. You can also complain to the Information Commissioner's Office (ico.org.uk) if you're unhappy with how your data is handled.
Write to mike.bushell@crumbsim.com.