I’m building a mobile command-center for my Bitcoin holdings, geared strictly toward long-term investment. What I need is a clean, lightweight app (iOS and Android) that pulls reliable, real-time market data and turns it into digestible analysis I can act on without ever opening a laptop. The core of the job is to wire up live price feeds, overlay them with historical data, and present trend-spotting tools such as moving averages or volatility bands so I can gauge entry or exit points at a glance. A simple portfolio screen that shows my total BTC balance, cost basis, and unrealised P/L over time will sit beside the analytics dashboard. Because I’m playing the long game, the interface should prioritise clarity over flashy intraday charts—daily, weekly and monthly views are enough. I have no interest in web or desktop access; everything must feel native on mobile, with a secure login (biometrics preferred) and encrypted local storage for API keys. If you rely on third-party libraries, please choose actively maintained, open-source components. Deliverables • Fully tested iOS and Android builds ready for App Store / Play submission • Source code and documented setup instructions • A short, in-app tutorial explaining each analysis tool Acceptance criteria: live price refresh ≤10 s, zero crashes in a 24-hour test run, and portfolio calculations matching data pulled directly from the exchange API. If this sounds like your cup of tea, tell me which data providers and tech stack you’d pick and how long you’d need for a first workable beta.