Ninety days is the interesting length. It is past the point where a behaviour becomes automatic for most people, long enough to produce a result somebody else can see, and short enough to hold in your head from beginning to end. Thirty days tells you whether you want something; ninety tells you whether it works.
Free, no sign-up. Worked out in your browser, nothing sent anywhere, and the result imports into EvyOS.
Name the behaviour.
Everything is worked out in this page and saved in this browser only. Nothing is sent anywhere.
Phase one exists to establish, not to progress. Almost everybody starts phase one too hard.
It is the difference between a challenge and a long streak you eventually drop.
Something somebody else could check on day 90. That is what makes it a challenge rather than a mood.
The design is three phases because ninety identical days is unsustainable and nobody admits it in advance. Establishment, where the only goal is not missing. Building, where the volume rises. And consolidation, where it drops slightly and you find out whether the thing has actually stuck or was being held up by novelty.
The mid-point review at day 45 is the part that makes this different from a long streak. It is where you are allowed to change the plan, and being allowed to is what stops people abandoning it instead.
This works something out and then forgets it. It cannot tell you whether the number moved, because it has no memory of the last time you ran it and no idea what you did in between. Every calculator on the internet has that limit, and if it has never bothered you then this one is yours for free for good.
EvyOS is the same structure with the work recorded against it. Send the result across and it becomes real goals, tasks or habits with their dates — then the next answer is computed from what actually happened rather than from what you remember typing.
Goals, projects, tasks, habits and skills in one system, with the work logged against what it belonged to.
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