Most trackers reset
Change your plan in most apps and the old one is gone: a new goal, a new start date, a fresh graph. Six months of real data turn into a before.
Undiet does the opposite. Every program you mark becomes a period on one timeline, and the weight curve runs over all of them.
Periods, not programs
When you mark a program from the catalog, a period starts. When you mark another, or none, the first one ends and stays, with its own start, end, weigh-ins and change.
So a six weekfastingstretch and a three monthketostretch sit next to each other on the same axis, each with its own numbers.
The no diet period counts
The months between programs are the part most apps throw away. Undiet keeps them as a period of their own.
What happens after you stop is often the most useful thing the graph shows. It is where the honest comparison lives.
Switching is data, not failure
Trying something, finding it did not fit, and moving on is how most people actually arrive at what works. A timeline with four periods on it is a record of learning, not of giving up.
The feeling comb makes the record readable: the period you could not live with shows up as a row of heavy days, whatever the scale did.
Programs with built in switches
Some programs are rotations by design.Undiet 90cycles structured phases with recovery breaks over ninety days, andWhole30is a thirty day block followed by reintroduction.
They fit the same timeline. Each phase can be its own period, or the whole program one period, whichever reading you want later.
How to switch cleanly
Open the catalog page of the new program and tap I am on this. The old period closes that day and the new one opens; nothing else changes.
If you are stopping without a replacement, mark no diet. The line keeps going, and the stretch gets the same care as any program.
Reading it back later
Scrub along the curve with a finger and the readout follows: the weigh-in, the date, the program and the day you were on. Period labels light up as you pass through them.
The free app shows the last 90 days.Plusopens the graph to the whole journey and adds the stats for every period: the change, the pace, the check-ins and the average feeling.
Choosing the next one
If the next period is an open question,Find my dietnarrows the 98 programs to a shortlist in five taps, andMediterraneanis where many people land after a strict stretch.
Whatever you pick, mark it. The timeline is only honest if it is complete.