Symmetry

What makes it different

Symmetry, a gym-tracking app from Spain, pulled $160,324 in monthly recurring revenue — the figure on founder Mauro Botanes' own RevenueCat dashboard during a Starter Story interview published September 2026. One year after its June 2025 launch, the app was at roughly 3 million downloads across iOS and Android, dominant in Spain and Mexico.

The breakthrough wasn't the product — Mauro is blunt that building what founders want is a 'terrible idea' and building what users request is merely 'mediocre.' Symmetry runs like a science lab instead. His team built an internal system called EVELYN to document every experiment, and nothing ships without an A/B test: a single commitment screen added to onboarding lifted retention by 3.73%. On the growth side, they scaled a creator army instead of paid ads — nearly 80,000 videos from 500+ accounts, close to a billion views — powered by profit-sharing that gives creators nearly half of the revenue they generate.

What makes this worth celebrating is the discipline behind it. Most fitness apps chase features or influencers; Symmetry treats distribution and product as measurable systems — quarterly OKRs, analytics on every screen of onboarding, experiments that kill anything that doesn't move the numbers. In one of the most saturated app categories, process turned out to be the actual moat.

The playbook, in their own words

• Launched June 2025; the founders were fitness YouTubers in the Spanish-speaking market, and that existing audience gave the launch its initial spike source ↗
• Roughly 3 million downloads across iOS and Android in about a year, with a dominant position in Spain and Mexico source ↗
• UGC growth engine: nearly 80,000 videos posted in a year from 500+ creator accounts, close to a billion views — creators are paid nearly half the revenue they generate source ↗
• Runs like a science lab: an internal 'EVELYN' experiment system documents every test, and nothing ships without an A/B test in PostHog — one onboarding commitment screen lifted retention 3.73% source ↗
• Three-phase philosophy: build what founders want (terrible) → build what users request (mediocre) → only build what controlled experiments prove valuable source ↗