Support

We read every email: support@cinderfast.com

If you feel unwell while fasting — dizzy, faint, confused, a racing or skipping heartbeat, or chest pain — stop fasting, eat or drink something, and get medical help. In an emergency call your local emergency number (911 in the US).

Put Cinder on your Home Screen

iPhone: open cinderfast.com in Safari → Share → Add to Home Screen. Android: Chrome offers Install app. Cinder works offline once installed.

The sign-in code didn't arrive

Check spam and promotions, wait a minute, and request a new code. Codes expire after a while. Still stuck? Open Health → History & settings → Diagnostics, tap Copy details and email them to us.

Moving to a new phone

Your log lives on your phone. Before switching, go to Health → History & settings → Back up, then use Restore on the new phone. Friends reconnect when you sign in with the same email.

Export your data

Health → History & settings → Export CSV gives you a spreadsheet of your fasts, weights and food log.

Delete your account or your data

Health → History & settings → Delete account permanently removes your account and everything on our server. Erase this device removes everything Cinder stores on your phone. You can also email us and we'll do it for you.

Ash-ly or photo estimates aren't working

Both need you signed in (the same email code as Friends) and a connection. There's a daily allowance; it resets the next day.

Credits

Some objects in the fire, water and arcade animations (the fire engine, whale, bucket, speedboat, water pistol, clouds, crab, octopus, elephant, wave, snowman, fire extinguisher, robot, ice cube, polar bear, mouse and flame), the spider, fly and bow on the holiday checkpoint covers, and the 3D icons for meal ideas, feelings, themes and holiday greetings are from Microsoft's Fluent Emoji, used under the MIT License, Copyright (c) Microsoft Corporation. Food data comes in part from Open Food Facts and USDA FoodData Central.