66days, median, for a new habit to feel automatic
You need the middle weeks, and the middle weeks are where people quit.
Motivation carries the first ten days. After that a habit has to run on structure. A tracker gives the boring weeks a reason: the day isn't finished until the list is, and the list is short enough to finish.
Where the number comes from: Lally et al., 2010, tracked people forming a single new daily behaviour; the median time to feel automatic was 66 days, with a range of 18 to 254. Recurr's month view and the 30-day badge are built around that middle stretch.
1streak you don't want to break
Losing a run hurts more than gaining a day feels good.
That asymmetry is loss aversion, and it's the reason the streak is the biggest number on the screen. Once you're at 12 days, day 13 costs less effort than the thought of starting again at zero. Away days protect the run when life happens, so the streak stays honest without being fragile.
In the app: the streak counts days at or above 70% of the list, not perfect days. One missed habit doesn't reset you; a missed day does.
×2completion when someone else can see
A group turns intention into something you'd have to explain.
Private goals fail quietly. When four friends can see your day was 2 of 5, skipping becomes a small social cost, and turning up becomes a small social reward. Recurr shows group scores to the group and nothing more, so the pressure is real but the exposure is limited.
Roughly: studies on accountability partners and public commitment consistently find large gains in follow-through; the ASTD/ATD figure often quoted is 65% with a commitment to someone versus 10% alone, and 95% with a scheduled check-in.
7days per check on a long-term goal
A number you log weekly is a goal you can steer.
“Bench 100 kg by December” is only a wish until it has a stat behind it. Recurr's long-term goals take a start value, a target and a date, then tell you whether the pace fits. When the number goes stale it asks for an update. You can't drift for a month without noticing.
Also true of the body: weekly weigh-ins and measurements smooth the daily noise. A single number per week is enough to see a trend by week three.
30seconds a day
It has to be faster than the excuse.
Pick up phone, one tap on the centre button, tick, done. The tracker is the first thing you reach, not a screen buried under a dashboard. If logging takes longer than the habit, the log dies first.
Design rule the app follows: ticking is never more than one tap from any screen.