PlankPact
The plank app where quitting hurts someone else too.
PlankPact launched on May 5, 2026 with 10 votes, #1,388 of 21,460 launches that month and more than 90% of that year's launches.
What it does
Before building PlankPact, we ran a simple experiment. We paired 14 strangers on WhatsApp and gave them one task: do a plank every day for 7 days. If your partner quits — you both lose. All 7 pairs completed the challenge. 3 continued on their own. That experiment became this app. Research shows we're more afraid of letting someone down than failing ourselves. That's the entire mechanic behind PlankPact.
Two people. One plank a day. Seven days. If one quits, both lose. Plank Pact pairs you with a partner for shared accountability.
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Source: Product Hunt launch ↗
Launched alongside, May 2026
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Parallel agents, diff reviewer, and multi-model comparisons
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