Privacy
Last updated 1 October 2026
Saved in your browser
- Your daily results, the lines you drew, hints used, and whether you've seen the how-to screen. These power your stats and streaks.
- A sign-in token for your leaderboard account.
- A random ID for this browser, used for the usage records below.
This stays on your device. Clearing this site's data in your browser settings removes it.
Saved on our server (for leaderboards)
The first time you finish a round, Contrail creates an anonymous account for you. No name or email is needed. It stores:
- A random account ID and a leaderboard name. You get a random one like "Navigator 4821", and you can change it.
- For each round you finish: the date, the airports, your scores, hints used, and where you placed each airport on the map.
- Your email address, only if you choose to add one so you can use your account on another device.
How the games are used
To see what works and fix what doesn't, the games record a few things you do, such as opening a game, finishing a round, sharing your result, clicking through to another game, opening a help screen, and errors. Each record has a random ID kept in your browser, the page you came from (for example a search engine or an ad), the kind of device, and your leaderboard account if you have one. It doesn't include your email. Only we can see it, and it's covered by the deletion request below.
What other players see
- Your leaderboard name and daily score, on that day's leaderboard.
- Where you placed the airports, mixed anonymously into the "everyone's guesses" heat map, and only for players who have already finished that round.
Other players never see your account ID or email.
Services we use
- Vercel hosts the site. Its Web Analytics counts page visits without cookies.
- Supabase stores leaderboard accounts, scores, and the usage records above.
- Google Fonts serves the typefaces, so Google receives a standard web request from your browser.
- Google Ads tag: we advertise on Google, and its tag tells Google Ads when someone visits after clicking an ad, so we can see whether the ads work. It may set cookies. You can manage ad personalisation at adssettings.google.com.
Deleting your data
To delete your leaderboard account and scores, email contrailgg@proton.me with your leaderboard name (shown in Your stats). To remove what's saved in your browser, clear this site's data.
Children
Contrail isn't aimed at children under 13, and we don't knowingly collect their information.
Changes
If this changes, we'll update this page and the date at the top.