Coastline is a FIRE planning app for iPhone. Real projections, scenario modeling, and on-device AI — your financial data never leaves your phone.
Download on the App StoreProfessional-grade financial modeling, built natively for iPhone.
Scrub through your entire financial timeline year by year. Watch your net worth grow, hit FI, and see exactly how your money works in retirement. Haptic milestones and AI narratives bring each year to life.
Stochastic simulations show the real range of outcomes — not just the median. See your success probability across market conditions.
Create alternative futures that override specific assumptions. Compare them side by side with delta notation showing exactly what changes.
Roth conversion ladders, ACA subsidy optimization, bracket analysis, and tax-aware withdrawal sequencing.
Seven black-swan scenarios — deep recession, stagflation, lost decade — tested against your specific numbers.
Fixed, variable, guardrails, VPW, Vanguard Dynamic, and Guyton-Klinger. See which minimizes your lifetime tax bill.
Apple Foundation Models generate contextual narratives across 12 views — projection analysis, scenario comparisons, Time Machine year-by-year narration. Everything runs on your iPhone. No data sent anywhere.
Conversational FIRE strategy advice powered by Claude. Your questions go through an anonymized proxy — no names, no account numbers, no personal identifiers. Available with Pro.
Every calculation runs on your iPhone. Your financial data is stored locally and never transmitted.
Zero analytics, zero telemetry, zero ad networks. We don't even know how many people use Coastline.
Download and start planning. No sign-up, no email, no password. Your data lives in your device's local database.
Free to start. Pro unlocks unlimited scenarios, AI advisor, and advanced tools.
Download on the App Store