From Viral Spreadsheet to App Store Domination: Mastering Demand-Led Launches

Every June, Lisbon transforms into a whirlwind of street parties, sardines on grills, and hammer games under colorful banners during Santos Populares. Amid the excitement, a logistical nightmare emerges: coordinating hundreds of pop-up events across neighborhoods. For years, attendees have relied on a crowdsourced Excel sheet shared virally on TikTok and Instagram Reels. Posts pleading 'Where's the Excel this year?' rack up massive views, signaling acute user frustration with fragmented information.

This isn't just seasonal hype—it's a textbook case of unmet need amplification. Social platforms act as real-time focus groups, where pain points surface organically. By monitoring these conversations in late May, Stephane Duarte identified a prime opportunity: digitize the beloved spreadsheet into a searchable, filterable app.

Duarte didn't chase perfection. In just days, he prototyped a minimal viable product (MVP) focused on core desires: a full calendar of Lisbon events, artist filters, location search, and favorites. Launched on May 28th exclusively for iOS, the app 'Festas Populares' featured exactly what festival-goers wished for in prior years.

Key to success was ruthless prioritization. No bloated features—just solving the immediate chaos of 'where and when.' This lean approach aligns with growth hacking principles: validate first, iterate via user feedback. Early metrics exploded: #1 in Entertainment, #12 overall in Portugal within hours, proving demand was primed and waiting.

Post-launch, the app self-propagated on TikTok and Reels without paid promotion. Users, thrilled by the upgrade from clunky spreadsheets, shared screenshots of top rankings and event discoveries. This created a feedback loop: visibility fueled downloads, downloads generated testimonials, amplifying reach.

Psychologically, it tapped FOMO (fear of missing out) during peak festival season. Cultural specificity—tied to Portugal's beloved tradition—ensured hyper-local relevance, outperforming generic tools. The result? Sustainable organic growth, with ongoing updates based on real usage.

This story redefines app success: don't invent needs, amplify them. Monitor social chatter for 'demand proxies' like viral pleas or hacky workarounds (e.g., Excel sheets). Time launches to seasonal peaks for momentum. Build MVPs with user-centric basics: search, filter, save.

Overthinking kills speed—Duarte's weekend sprint shows shipping imperfectly trumps perfection. Post-launch, leverage rankings as social proof. Expand methodically: test in Lisbon, scale nationwide. In niche markets, cultural hooks outperform broad appeals.

Beyond Portugal, this model applies universally. Identify niche events (music fests, sports seasons, holidays) with fragmented info. Digitize shared resources into apps. Use geo-targeting for local dominance. Future-proof by inviting user contributions, turning users into evangelists.

Duarte's next steps—Android version, national expansion—highlight iteration. Track metrics like retention during events to refine. This isn't luck; it's engineered product-market fit via social listening.