Open on this clock

The line under the hours says there is no time cap

On the online fasting timer, the line under the hours says “Open-ended · no time cap.” It does not show a goal such as 16h, and it does not show a percent toward a finish, because you did not pick a finish.

The ring still moves as the hours pass. It moves through the hours of the current stage name, then starts again for the next stage name. A full ring means that stage’s hours have passed. It does not mean you should eat, and it does not mean the fast is finished. You finish the fast by pressing End Fast.

The stage name follows the hours that have passed. What the stages on the timer mean lists each name and the hours it covers. The name does not come from a blood test. Seeing the next name is not a reason to keep fasting.

After the first 24 hours, a second line counts the days and the total hours, for example “1 day · 24h 00m total.” That line counts time. It does not rank the fast.

The goal-reached reminder does not fire

A fast with a finish time can remind you when that time arrives. In Settings, that reminder is labeled Goal reached, and it applies to timed fasts. Open has no finish time, so that reminder does not fire.

If you turned on alerts for a new stage, one can still arrive when the stage name changes. The alert names the hours that have passed. It does not tell you to continue. If you feel dizzy, confused, faint, or have chest pain, stop and eat. The signs are in When to stop a fast.

Change mode keeps the start time

Tap Open before you press Start. If a fast is already running and you tapped the wrong button, tap Change mode under End Fast. The screen says the clock keeps the same start time and the hours already counted. Only the target changes. You can switch from 16:8 to Open, or from Open back to 16:8, OMAD, or a number you type in Custom.

The 16:8 page and the OMAD page are the same timer. The 16:8 page starts with 16:8 already chosen. The OMAD page starts with OMAD already chosen. Neither page starts with the Open button.

The finished row says Open

When you press End Fast, the list in History on this clock saves the row, including when you eat earlier than you had in mind. The row says Open. Leave a short row on the list. Do not start a longer fast the next day to make up for hours you did not reach.

Friends can see whether you are fasting or not fasting. They cannot see that you used Open, and they cannot see the hours.

Open is not the step after a first 16:8

Use Open when you already decided how you will stop: a clock time you will eat, or a limit you already chose, with no ring to fill toward that limit. Use it when you only want the elapsed hours.

A daily window still includes food every day. The 24h, 36h, and 48h buttons are one stretch with no meal in the middle. Open keeps counting for as long as you do not press End Fast. Leaving it running past a day does not make that longer fast safer, and it does not make the fast more successful.

Pregnancy, being under 18, an eating-disorder history, and medicines that lower blood sugar are reasons to stay off Open until a clinician who knows you has said otherwise. Those situations are in Who should be careful with fasting. If you already mean a stretch past a day, start with Before a longer fast. Past about 72 hours, the note for that length is If you already mean many days.

Open the online fasting timer. If you want a finish time, pick 16:8 or type 12 or 14 hours in Custom. Tap Open when you already mean no finish time. Press End Fast when you eat, including when you eat earlier than you had hoped.