About this app

Same goal. One friend. A card on the line. Lock In Twin turns a weekly goal into a challenge between you and one friend. Choose your target, pick a punishment deck, and back up your check-ins with photos. Hit your target while your friend misses theirs, and they owe the card. PICK YOUR CHALLENGE Gym three times this week? Read on four days? Choose a fitness activity or Reading and agree on the same weekly target. You can have up to three separate challenges, each with one friend. PUT A CARD ON THE LINE Pick four punishment cards and send the challenge. Your friend reviews all four and accepts. Pick three and write one of your own, or pick all four. One punishment gets drawn. The loser has to do it. Your first card is drawn when the challenge starts, so you both know the stakes before checking in. Your friend gets the next turn to pick the deck. Take turns proposing replacements, or keep playing with the cards you already agreed on. If a replacement isn't accepted before the next draw, the current deck stays in play. Existing challenges keep their original deck rules. BRING THE PHOTO Check in with a photo taken in the app. Your friend has 12 hours to review it. If they don't respond, it automatically confirms so your progress doesn't stay stuck waiting on them. SEE WHO OWES THE CARD If you hit your target and your friend misses theirs, they owe the punishment. If you both hit or both miss, there's no loser. Whoever owes the card sends proof, and the winner confirms it. KEEP THE RECEIPTS Look back at your weeks, results, and photos. Share the week's result. One bad week doesn't erase the weeks that came before it. FREE TO LOCK IN Starting challenges, writing cards, checking in, reviewing proof, and keeping history are free. No ads. No subscription. Optional packs of three re-roll credits let you redraw an eligible upcoming card before it locks. Free and paid re-rolls share a limit of three per person, per challenge, per upcoming week. Buying credits can't erase a loss or a debt. Pick your goal. Bring your friend. Lock in.