Build habits
that actually stick
HabitGlass turns your year into a living calendar of wins. Track up to three daily habits with gorgeous visuals, science-backed milestones, and themes that make you want to open the app every day.
Your whole year,
at a glance.
HabitGlass is a beautifully minimal habit tracker for iPhone and iPad that shows your full year as a visual calendar — every day a small colored cell, every streak a glowing trail.
Unlike apps that hide your progress behind charts and dashboards, HabitGlass puts your streak right in front of you. Green cells mean done. Grey means missed. The visual weight of your consistency becomes its own motivation.
Track up to three habits simultaneously — each with its own color, time window, and calendar. Swipe between months, tap a day to mark it done, and watch your streaks grow across the year.
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📅Full-year calendar viewAll 12 months, swipeable, with your entire history visible at once.
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🎨6 gorgeous themesDefault, Stars, Dark Lord, Cotton Candy, Sunset, and Fall Harvest — with holiday overlays.
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🌍50+ global holidaysFrom Diwali to Día de los Muertos — toggleable in Settings.
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🔔Smart time windowsSet a daily time range per habit — the app highlights which habit is active right now.
Hit 7, 21, or 66 days and the app bursts into a full-screen confetti celebration — with optional voice announcement via Siri. Habit streaks that span month boundaries are tracked accurately so you never miss a milestone.
Six reasons it
actually works.
Every design decision in HabitGlass is backed by behavioural psychology research. Here's what the science says — and how the app delivers it.
Don't break the chain
A full calendar of your completions makes your streak impossible to ignore. Seeing 20 green cells in a row makes you feel physical discomfort at the idea of breaking it — exactly what Jerry Seinfeld built his career on.
Wire in neural pathways
Habits are physical structures in your brain. Every repetition deepens the groove. HabitGlass's milestones at 7, 21, and 66 days celebrate the real neurological inflection points where behaviour shifts from effort to instinct.
One tap to mark done
The biggest predictor of habit success is how easy it is to record. HabitGlass's entire UI is optimised for the fastest possible "mark done" interaction — no login, no loading, just one tap and a satisfying chime.
Three habits, not thirty
Research on willpower shows that tracking more than three behaviours simultaneously causes rapid dropout. HabitGlass deliberately limits you to three habits — enough for real change, not so many it becomes a second job.
Time-anchored habits stick
Implementation intentions — linking a habit to a specific time — double success rates according to meta-analysis. HabitGlass lets you set a daily time window per habit and shows a live "NOW" badge so you always know what to focus on.
Celebrate every win
Variable reward — the dopamine hit of unexpected positive feedback — keeps habits sticky. The confetti celebration, milestone overlays, and chime sounds provide immediate sensory reward every time you complete your habit.
Science-backed
celebration points.
HabitGlass doesn't just track days — it celebrates the moments where neuroscience says real change happens. These aren't arbitrary numbers.
One Week Strong
The first week is the hardest. Neural plasticity research shows that after 7 consecutive days, your brain begins forming a dedicated habit loop. You've crossed the first real threshold — this is no longer just an intention.
Three Weeks In
The "21 days" concept has real roots — three weeks of consistent repetition measurably increases grey matter density in habit-related brain regions. The pathway is deepening fast. Momentum is on your side now.
This Is Who You Are
A landmark 2010 UCL study found 66 days is the average point at which a behaviour becomes truly automatic — requiring no willpower, no decision-making. After today, this habit is part of your identity. Science says so.
A common bug in habit trackers is that streaks reset at the month boundary. In HabitGlass, the streak engine walks backwards day-by-day through the actual calendar — so a streak that runs from January 28 to February 7 is counted perfectly as 11 days, and milestones fire at exactly the right moment.
Common questions
Everything you need to know before downloading.
How many habits can I track? +
Does it work on iPad? +
Can I backfill days I forgot to log? +
What are the milestone days? +
Do streaks work across month boundaries? +
How does the time window feature work? +
What holidays are included? +
Is my data private? +
Does data persist year to year? +
Can I turn off the sounds and celebrations? +
What does the Time Travel feature do? +
What are the available themes? +
Start your streak
today.
Free to download. No subscription. No account. Just you and your habits.