The fitness app that makes you show up.
Accountability that actually works.
Compete with friends, put money on the line, and stay accountable until the challenge is complete.
01 Create a Challenge
Set your goal, duration, and entry amount.
02 Invite Your Friends
Share your private invite link.
Everyone joins with money on the line.
03 Complete & Win Together
Complete the challenge before time runs out. Winners split any forfeited entries.
How does Arin work?
Create a multiplayer fitness challenge, invite your friends, and put money on the line. Everyone who completes the challenge keeps their commitment and winners split forfeited entries.
How is my progress verified?
Progress is verified through activity submissions reviewed by Arin. Simply complete your goal before the challenge ends.
What happens to my money?
Your payment is securely processed through Stripe. If you complete the challenge, your entry counts toward the winners’ payout. If you fail, your entry is forfeited and distributed among those who finish.
Do I need friends to use Arin?
Yes. Every challenge is multiplayer. Invite your own group or join a friend’s challenge using an invite link.