The product
RTUMap is a survey tool for commercial HVAC companies. Technicians use it on rooftops to record the units on a building. Rooftops often have no signal, so the app has to keep working offline.
The challenge
The app began as a tool for one HVAC company. The goal was to turn it into a product that any HVAC company can sign up for and pay for on its own. That means three things at once:
- Keep the offline experience reliable for technicians in the field
- Separate each customer's data safely
- Let new customers start a trial and subscribe without anyone's help
What I built
- Offline-first PWA. The app stores survey data on the device with service workers and IndexedDB, then syncs when the connection returns.
- Multi-tenant architecture. Each company gets its own isolated workspace on a shared platform.
- Stripe subscriptions. Self-service sign-up, trials and billing.
- Operator portal. A back office for the business owner to manage customers and accounts.
- Marketing website. Landing pages, pricing, comparison tables and FAQs on Cloudflare Pages, with free-trial A/B testing, UTM tracking and Google Analytics 4 events.
Why a PWA
Field teams use a mix of phones and tablets. A Progressive Web App runs on all of them from one codebase, installs from the browser and updates without an app store review. For a small product team, that keeps cost and release time low.
The result
RTUMap is live at rtumap.com as a subscription product, with a marketing site built to turn visitors into trial users.
Building something similar?
See my pages on PWA development and SaaS development.