# 21 Pulse > 21 Pulse is a free, Bitcoin-only iOS app. It tracks live Bitcoin prices, helps users find places to spend sats nearby (SatMap), and teaches Bitcoin basics through a 42-question quiz — with no altcoins, no tracking, and no server-side data collection. Available in English, German, and Spanish. 21 Pulse is built exclusively for Bitcoin: no altcoins, no ads, no analytics, no account required. All user data (portfolio, settings) stays on-device. The app is available for free on iOS, with Android planned for mid-2026. ## Product - [App Store listing](https://apps.apple.com/de/app/21-pulse/id6757953169): Download 21 Pulse for iOS. - [Homepage (EN)](https://21pulse.app/) · [Startseite (DE)](https://21pulse.app/de/) · [Página principal (ES)](https://21pulse.app/es/): Overview of features — live price & charts, Lightning SatMap, on-chain data, portfolio tracker, Bitcoin-only news, and a 42-question Bitcoin quiz. - [Feature Brochure (EN)](https://21pulse.app/21pulse_brochure_EN.pdf) · [DE](https://21pulse.app/21pulse_brochure_DE.pdf) · [ES](https://21pulse.app/21pulse_brochure_ES.pdf): 8-page PDF overview of all features and privacy principles. ## Learn - [Bitcoin Quiz (EN)](https://21pulse.app/quiz.html) · [DE](https://21pulse.app/de/quiz.html) · [ES](https://21pulse.app/es/quiz.html): Interactive 42-question quiz (Beginner & Advanced) on Bitcoin basics, Lightning, on-chain data, and mining. - [Bitcoin Resources (EN)](https://21pulse.app/resources.html) · [DE](https://21pulse.app/de/resources.html) · [ES](https://21pulse.app/es/resources.html): Curated books, YouTube channels, hardware wallets, and tools for learning and using Bitcoin. ## Blog - [Paying with Bitcoin in Las Palmas 2026 (EN)](https://21pulse.app/blog/bitcoin-las-palmas.html) · [DE](https://21pulse.app/de/blog/bitcoin-las-palmas.html) · [ES](https://21pulse.app/es/blog/bitcoin-las-palmas.html): Guide to paying with Bitcoin and Lightning in Las Palmas de Gran Canaria — merchants, wallets, and the local Bitcoin community. ## About - Contact: mail [at] 21pulse.app - No personal data is collected, stored, or transmitted by 21 Pulse. Public market data is fetched from Binance, CoinGecko, and mempool.space.