What is a habit tracker?

A habit tracker is the simplest possible contract with yourself: do the thing, mark the square. This one lives at a URL, needs no account, and keeps every mark in your browser. The magic isn't the marking — it's what a growing row of filled squares does to your brain.

your week, as squares

Mon Tue Wed Thu Fri Sat Sun
 ■   ■   ■   ■   ■   □   □
                     ↑
              today: one click

Why a grid beats willpower

Jerry Seinfeld famously wrote jokes every day and marked an X on a wall calendar — the only goal was to not break the chain. It works because of loss aversion: once a streak exists, your brain treats it like property, and we fight roughly twice as hard to keep something as to gain it. The grid turns "be disciplined" (vague, exhausting) into "don't break that" (concrete, almost automatic).

■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■   a chain you don't
                          want to break

■ ■ ■ ■ ■ □ ■ ■ ■ ■ ■ ■   one miss: a dent,
                          not a disaster

■ ■ ■ ■ □ □ □ ■ □ □ □ □   misses unanswered:
                          a new habit forming —
                          just not the one you wanted

Which gives you the one rule worth memorizing: never miss twice. One gap is noise. Two in a row is the start of a different pattern.

How long does it really take?

Not 21 days — that number comes from a 1960s plastic surgeon's anecdote about patients adjusting to their new looks. The actual research (Lally et al., University College London, tracking real people building real habits) found it takes 66 days on average for a behavior to feel automatic — with a huge honest range of 18 to 254 days depending on the person and the habit.

how automatic it feels

100% ┤                      ▄▄▄▄▄▄▄▄▄
     │              ▄▄▄▄▄▀▀▀
     │         ▄▄▀▀▀
 50% ┤      ▄▀▀
     │   ▄▀▀
     │ ▄▀
  0% └─┬──────┬──────┬──────┬──────
       0     22     44     66  days

The good news is hidden in the curve's shape: the steep part is at the start. Every week is easier than the one before it — the effort is front-loaded, the payoff compounds.

Small compounds

Getting 1% better every day doesn't make you 365% better in a year — it makes you about 37× better, because improvement compounds. The same math runs in reverse for 1% worse. Tiny daily check-ins are the whole game.

1.01³⁶⁵ ≈ 37.8        0.99³⁶⁵ ≈ 0.03

day   1  ▏
day 120  ██▍
day 240  ███████▊
day 365  ██████████████████████████▉

Four tactics that actually work

1 · Start embarrassingly small. Track the two-minute version: not "run 5k" but "put on running shoes." You can't build on a habit that doesn't exist yet.

2 · Stack it on something you already do. The most reliable cue isn't a time or an alarm — it's a habit you already have.

after I…                 I will…

[ pour morning coffee ] → [ read one page  ]
[ brush my teeth      ] → [ do one push-up ]
[ close my laptop     ] → [ write one line ]

3 · Keep the evidence visible. Install this page on your home screen. The grid you see every day is the grid you fill.

4 · Never miss twice.Yes, again. It's the rule that saves every other rule.

Your data never leaves this browser

No account, no cloud, no analytics on your habits. Everything you track is stored locally on your device, and you can export it as JSON anytime (or import it somewhere else). A habit tracker holds an unusually honest diary of your life — we think that should belong to you, not to a server.

Frequently asked questions

made by bernardzitzer.com · pairs well with daey.app for journaling