Health & Fitness · iPhone + Web
Collective Weight
Lose weight with your crew.
Collective Weight turns losing weight into something you actually look forward to — because you're doing it with your people.
Log your weigh-in in seconds and watch the pounds come off on a clean, zoomable trend chart. Then make it interesting: start a challenge with friends, family, or coworkers and see who can drop the most body weight.
On the web
A full platform, not just an app
Collective Weight runs on the web too. Sign in at collectiveweight.com with the same account to log weigh-ins, run challenges, check leaderboards and message your group from any computer. Everything stays in sync with the iPhone app.
Visit collectiveweight.com ↗
What it does
Friends keep you honest
Group challenges, a live leaderboard, and a community feed mean someone always notices when you show up — and when you don't.
Progress you can see
Your weight trend, weekly rate, consistency score, best streak, and goal projection update with every entry.
Challenges that motivate
Create private challenges for any group and date range, ranked by percentage of body weight lost so everyone competes fairly.
Apple Health, two-way
Import weight, body fat %, BMI, and lean mass automatically — and weigh-ins you log are written back to Apple Health.
Stay connected
Message friends directly, react in per-challenge group chats, and earn achievements that reward consistency.