Barometer & Altimeter vs CellMonitor

Know your elevation. Follow pressure changes. Keep a useful record of your hikes, climbs, stairs and everyday observations—with clear readings on iPhone and iPad, plus Apple Watch, widgets and Live Activities on supported devices. • Current altitude above sea level, with relative gain and net change kept separate. Check the reading source and freshness; authorized GPS can provide a fallback where available. • Start, pause, resume and save a recording. Authorized background recording keeps a session going while you use another app or lock your phone. • Find, rename and favorite saved recordings, add notes, compare charts and share data as CSV. • Check your wrist, widgets or Live Activity. Use Siri and Shortcuts to read, record or open saved sessions; interactive controls are available on supported OS versions. • Keep familiar metric/imperial units, Set Zero and pressure-reference calibration. Choose automatic weather, manual reference or a nearby US weather station where available. Readings depend on device hardware, permissions, source availability and conditions. Widgets and complications refresh on the system's schedule, not continuously. Watch recording controls need a reachable iPhone; phone-free Watch recording is not included. Saved history and supported local readings work offline; weather and station updates need a connection. HowHigh is for observation, not certified navigation or safety-critical guidance.

Know exactly where your data goes — across every SIM, every cycle, every day. CellMonitor tracks your cellular and WiFi usage in real time, right on your device. No account needed. No VPN. No subscriptions. Just accurate, private data tracking that works with any carrier worldwide. DUAL-SIM & eSIM SUPPORT The only data tracker built for modern iPhones. Track each SIM independently with separate billing periods, data caps, and custom labels. Switch between Work and Personal, Home and Travel — CellMonitor keeps them all in check. SMART DASHBOARD See your usage at a glance with a color-coded progress ring that shifts from calm to warning as you approach your limit. Daily average, daily budget, and days remaining — everything you need in one view. SPEED TEST Test your download speed, upload speed, and latency without leaving the app. Keep a history of results to spot trends or compare networks. USAGE REPORTS Export detailed CSV or formatted PDF reports of your daily usage — perfect for expense tracking, business travel, or just staying informed. Share via email, AirDrop, or any app. WIDGETS THAT WORK Four widget sizes — from a compact ring on your Home Screen to an extra-large dashboard with a 7-day usage chart. Always know where you stand without opening the app. APPLE WATCH COMPANION Your data usage, right on your wrist. CellMonitor syncs automatically to your Apple Watch with a two-page dashboard showing your progress ring, daily stats, and per-SIM breakdown. THRESHOLD ALERTS Set a custom warning percentage for each SIM. CellMonitor notifies you before you hit your cap — so you never get surprised by overage charges again. BUILT FOR PRIVACY Everything stays on your device. No cloud. No login. No tracking. CellMonitor uses iOS system interfaces to read usage data — nothing leaves your iPhone. WHY CELLMONITOR? - Works with every carrier, every plan, everywhere - Flexible billing cycles (any start day, any end day) - Sent vs. received breakdown for cellular and WiFi - Reboot-safe — never lose your count - Background refresh every 15 minutes - Optimized for iPhone, iPad, and Apple Watch - Built with SwiftUI and Swift Charts — fast, smooth, native One price. Every feature. No subscriptions. No ads.