HelioPeak

Solar monitoring for pvoutput on every Apple device.

iOS

Climate Tech

Data Visualization

Alpha

Hi PH 👋 I'm Sven, indie iOS developer behind HelioPeak. After a a lot of weekend and evenings, today I'm launching it on Product Hunt. THE BACKSTORY I have solar panels on my roof, and like ~150,000 other people I upload my data to PVOutput.org, the largest community-driven solar data platform on the planet (running since 2009). The existing iOS apps for PVOutput felt either outdated, hidden behind subscriptions, or both. So I built my own. WHAT IS HELIOPEAK A native SwiftUI app that runs on iPhone, iPad and Mac. - Live dashboard with production and consumption curve, peak power tracking, revenue calculation, weather chip - Grid Import / Grid Export tracking if your system reports it - Charts (day / week / month / year / total) with year-over-year comparison and intraday cursor - Solar Moments, automatic notifications when you hit a new record (best day, longest streak, milestones, anniversaries) - Home screen widgets in 3 sizes - Multi-system support (one-time €6.99 IAP, no subscription), one system for free - 6 languages: English, Dutch, French, German, Italian, Spanish - Annual report + year-over-year comparison PDF exports - Full data export to CSV and JSON - Heatmap visualization across years - Per-day notes you can attach to specific dates THE PHILOSOPHY I built this for myself first. Every choice is biased toward "what would I want as someone who actually checks solar production every day": - Speed matters. Even on an iPhone SE 2 with 4500+ days of historical data, dashboard cold-launch stays responsive - No tracking that follows you around, no ads, no subscription gates on basic functionality - Native everything, pure SwiftUI + Swift Charts + StoreKit 2, no React Native, no web wrappers - Privacy-first error logs that strip system identifiers before they leave your device - Localized properly, your interface language is yours to choose, separate from your iOS system language WHAT THE FREE TIER GETS YOU The full app, with one solar system. Adding more systems is a €6.99 one-time unlock. Want to test before buying? There's a demo system in onboarding that loads real PVOutput data, no account needed. WHO BUILT IT Solo project. Me, Xcode, v2.3.1 just shipped to the App Store this week, comments, feedback, feature ideas, all welcome (Issues / requests: [email protected]) Happy to answer anything about the tech stack, PVOutput.org community, indie iOS economics, or why I think solar monitoring apps don't need subscriptions. More info on the blog on the website available as well.