Duosti: Habit Tracker for Two

Pick a habit. Invite one person. Share one streak. If either of you skips, it breaks. And when one of you goes Premium, you both get it.

One habit. Two people. One streak.

Duosti is a habit tracker built for exactly two. Pick a habit, invite one person, and share a single streak. If either of you skips a day, it breaks. No leaderboards, no feeds, no followers. Just you, your person, and one number you're both protecting.

Most habit apps are a solo checklist with social features added on. Duosti starts from the partnership. The reason you'll show up tomorrow isn't a badge. It's that someone is counting on you.

HOW IT WORKS • Pick a habit: the gym, reading, a walk, a new language, meditation, drinking water, less scrolling, or anything you name yourself. • Invite one person: send your invite code by text or any messaging app. They join in a few taps. • Check in each day with one tap. When you're both done, the streak grows and you celebrate together. • Miss a day and the streak starts over. No shaming, no red marks. You just begin again, together.

BUILT FOR TWO • One shared streak, drawn in both your colors • See at a glance whether your partner has checked in today • Nudge your partner when the day is running out (up to 3 a day, so it never turns into nagging) • Notifications come from your partner, not from us. No promos, no "we miss you" • A paired chain shows every day you've held together • Confetti only when you're both done. The big moment is shared.

FAIR ABOUT TIME • Late nights count: by default your day ends at 3 AM, so a 1 AM check-in still counts for yesterday • Living in different time zones? Each of you can keep your own midnight • Daylight saving time won't break your streak • If your partner's check-in hasn't synced yet, the day stays open. A slow connection never breaks your streak.

NO ACCOUNT. WORKS OFFLINE. • No email, no password, no sign-up. Just a display name and an avatar. • Check in, see your chain and look back at your history without a signal. Everything syncs when you're back online. • A home-screen widget shows your streak and whether your partner is done today

UNLOCK TOGETHER When one of you subscribes to Duosti Premium, your partner gets Premium too. One payment, two people.

DUOSTI PREMIUM • Unlimited duos: a gym streak with one friend, a reading streak with another • Streak freeze: one a month to protect a streak you've worked for. It's never used without you choosing it. • Full history (Free keeps the last 30 days) • Stats: each person's completion rate, your best streak and your weekday patterns • Multiple reminder times • Milestone share cards • Habit templates

Free forever: one duo, the shared streak, daily check-ins, nudges, partner notifications and a home-screen widget. Checking in is never behind a paywall.

SUBSCRIPTION DETAILS Duosti Premium is available as a yearly subscription or a monthly subscription. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period, and renewal is charged within the 24 hours before the period ends. You can manage or cancel your subscription in your App Store account settings. Any unused part of a free trial is forfeited when you buy a subscription.

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