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Infra & tools cost analysis

External services and tools used in the app, with line-item cost estimates. Aligns with ~£650/month infra & tools in Year 1.

Summary (Year 1)

Category	Est. annual (£)	Est. monthly (£)	Notes
Firebase	~1,200	~100	Auth, Firestore, Hosting
Google Maps	~2,400	~200	Maps SDK, Places, geocoding
RevenueCat	~600	~50	Subscriptions / IAP
Sentry + email	~1,500	~125	Errors, logging
Figma, Slack	~600	~50	Design, comms
Other	~1,200	~100	Domains, misc SaaS
Total	~7,500	~625–650	Fits budget

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High impact (meaningful cost)

Service	What it does	Feasibility
Firebase	Auth, Firestore, Storage, Hosting	Very feasible. Main cost as MAU grows.
Google Maps / Places	Map browse, location search, geocoding	Feasible. $200/mo free credit; throttle & cache.
RevenueCat	Subscription management, like limits	Feasible. Low cost at low MRR.
Sentry	Error/crash reporting	Feasible. Use sampling. Crashlytics free.

Low / negligible cost

Flutter, Riverpod, Firebase Auth, Geolocator, SharedPreferences, url_launcher, Firebase Hosting, Crashlytics, Figma/Slack free tiers, CI/CD — all free or effectively free at our scale.

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Feasibility summary

• Feasible, low-ops stack: Firebase + Maps + RevenueCat + Sentry. Cost stays in low hundreds £/month at current scale.
• Little or no cost impact: Flutter/Dart packages, Geolocator, SharedPreferences, Firebase Auth, Crashlytics, most dev tools on free tiers.
• Watch as you grow: Firestore read/write volume and Google Maps/Places usage; caching and quotas keep costs predictable.

Business plan (Costs & Runway)