Privacy
SumNinja is a personal maths project made by me, Kim Døfler. Here is the short version of what happens to your information.
Your practice data
Your players, settings and practice history are currently saved in your browser. People using the same browser profile may see the same players, so a nickname is fine.
You can export a backup. To remove the data, clear SumNinja's site data in your browser.
Site services
Cloudflare hosts and protects SumNinja, and its Web Analytics measures visits and loading performance. I use Umami to understand which parts of SumNinja people use. It measures page visits and general game activity, including rounds started and completed and lessons completed. SumNinja's Umami data is kept for six months.
Messages
The feedback form is handled by Tally. Share only what you want to send me, including an email address or screenshots. I read feedback myself and may keep it so I can reply, investigate problems, remember ideas or revisit kind notes. You can ask me to delete your message.
Messages sent to hello@sumninja.com are forwarded by Cloudflare to my Gmail inbox.
Kim Døfler
Copenhagen, Denmark
As SumNinja evolves
I may add optional accounts or other ways to save your progress in the future. Check this page for the current explanation of how SumNinja handles information.