Coastline is a private, offline-first FIRE planning app for iPhone. Model your retirement with real projections, not guesswork. Everything stays on your device.
See your Lean, Coast, Barista, and Fat FI numbers side by side.
1,000 market simulations show the real range of outcomes for your portfolio.
Roth conversion ladders, ACA subsidy optimization, 72(t) SEPP calculations, and bracket analysis.
Test your plan against historical crashes and worst-case scenarios.
Optimize which accounts to draw from first to minimize lifetime taxes.
No accounts, no cloud, no analytics. Your financial data never leaves your device.
Coastline doesn't have servers. There are no user accounts, no analytics, no tracking, and no network connections. Every calculation runs on your iPhone. Your financial data is stored in your device's local database and never transmitted anywhere. Period.