{"app_store_id":926603602,"slug":"pro-altimeter-barometric-gps-926603602","name":"Pro Altimeter - Barometric+GPS","short_name":"Pro Altimeter","subtitle":"Manual/GPS/METAR Calibration","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/f4/66/3f/f4663f16-c061-47d1-2f72-cbbb92839646/AppIcon-0-0-1x_U007epad-0-11-0-85-220.png/512x512bb.jpg","icon_tint":null,"store_url":"https://apps.apple.com/us/app/pro-altimeter-barometric-gps/id926603602?uo=4","price":0.99,"currency":"USD","rating":3.825,"rating_count":40,"rating_worldwide":3.703,"rating_count_worldwide":64,"in_app_purchases":false,"recent_rating":null,"recent_review_count":null,"reviews_checked_at":null,"primary_genre":"Navigation","version_date":"2026-08-25T15:49:48Z","updated_at":"2026-11-14T08:49:12.792Z","stale":false,"missing_since":null,"one_liner":"Displays barometric and GPS altitude in feet and meters, with calibration methods and a day or night display mode.","verified_maker":false,"maker_site":null,"file_size_bytes":628736,"minimum_os":"12.0","content_rating":"4+","language_count":1,"screenshots":["https://is1-ssl.mzstatic.com/image/thumb/Purple112/v4/8f/d0/5c/8fd05c7d-f73d-aa0c-fbc3-6aa4e55b539a/pr_source.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple112/v4/40/b5/9c/40b59c20-40b8-176c-eda6-4bdf0acaf672/pr_source.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple112/v4/9e/c4/e7/9ec4e7e7-cc97-fc6c-0e7a-fe460ee381fb/pr_source.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple112/v4/5f/93/15/5f931517-f5c9-40d2-4dd0-4297461ec869/pr_source.jpg/392x696bb.jpg","https://is1-ssl.mzstatic.com/image/thumb/Purple112/v4/db/66/12/db6612a8-602d-d162-b18a-413e7a53d485/pr_source.jpg/392x696bb.jpg"],"developer_name":"Craig Hunter","editors_choice":false,"url":"https://apptierlist.com/apps/pro-altimeter-barometric-gps-926603602/","api_url":"https://apptierlist.com/api/v1/apps/pro-altimeter-barometric-gps-926603602","schema_version":"1.0","generated_at":"2026-11-14T18:25:29.321Z","data_as_of":"2026-11-14T14:15:12.946Z","description":"Pro Altimeter uses the high-fidelity barometric pressure sensor in iOS devices to measure and compute altitude.\n\nPro Altimeter has a dead simple interface.  Barometric altitude and GPS altitude are displayed in large easy to read numbers, showing units of both feet and meters, and giving realtime accuracy estimates from the hardware.  At bottom are calibration and display mode buttons. The display offers a highly-readable daytime mode with black digits on an LCD-green background, and a reversed night mode that is easy on the eyes in dark conditions. That's it!\n\nProper calibration is necessary to measure altitude from barometric pressure (this is why a pilot \"dials in\" the cockpit altimeter before taking off). Pro Altimeter offers four different methods for calibration -- choose the easiest and most convenient:\n\n1. Use GPS altitude.  This method correlates the measured local barometric pressure with the altitude measured by GPS. This method can be used when your device has a clear line of sight to the sky and a reliable GPS fix with good accuracy.\n\n2. Manually enter altitude.  This method correlates the measured local barometric pressure with known altitude from landmarks, elevation benchmarks, trail markers, topo maps, land surveys, etc.  Altitude can be entered in feet or meters.\n\n3. Manually enter pressure.  If you have a weather station, weather report, or METAR report with equivalent sea level pressure for a nearby location, this can be used to correlate local barometric pressure to altitude.  Pressure can be entered with units of inches Hg, kPa, or mb. \n\n4. Check local airports.  With the tap of a button, Pro Altimeter will locate the five closest airports within 100 miles (160km) of your present location anywhere in the world, and pull in METAR data.  From that list of five, pick the airport of your choice and Pro Altimeter will import pressure data for calibration.\n\nOnce calibrated, Pro Altimeter keeps track of the time since its last calibration.  Because weather and local barometric pressure change over time, the app will warn you when 6 hours have elapsed since the last calibration by flashing the \"CALIBRATE\" button.  You should calibrate as frequently as practical -- for example, on a hike, calibrate whenever you pass a trail marker or elevation benchmark.  But at a minimum, calibrate at least every 6 hours or whenever weather changes in your area.\n\nPro Altimeter is intended for iOS devices with a built-in barometric pressure sensor (iPhone 6 and later, iPad Air 2 and later, iPad mini 4 and later, and iPad Pro).  On older devices without a barometric pressure sensor, only GPS altitude and accuracy will be displayed.  \n\nIf you have an Apple Watch, check out the new Pro Altimeter for Watch and get all this same functionality on your wrist!","facts":{"developer_id":286743884,"developer_url":"http://hrtapps.com/proaltimeter","first_released":"2014-11-03T02:25:55Z","support_url":"http://hrtapps.com/proaltimeter","privacy_url":"http://hrtapps.com/theodolite/privacy.html","website_url":"http://hrtapps.com/proaltimeter","app_version":"1.1.4","release_notes":"Update to handle an error in the NWS feed used to access airport data for altimeter calibration.","rating_current_version":3.825,"rating_count_current_version":40,"star_counts":[7,2,1,11,19],"genres":["Navigation","Utilities"],"languages":["EN"],"content_advisories":null,"device_families":["iphone","ipad","ipod"],"made_for_iphone_duo":false,"chart":{"name":"top-paid Navigation","position":151}},"freshness":{"apple_read_at":"2026-11-14T08:49:12.792Z","catalog_read_at":"2026-11-14T14:10:12.610Z","reviews_checked_at":null,"summary_written_at":"2026-11-14T09:21:12.994Z","placed_at":"2026-11-14T09:18:13.372Z","scored_at":"2026-11-14T14:15:12.946Z"},"editorial":{"one_liner":"Displays barometric and GPS altitude in feet and meters, with calibration methods and a day or night display mode.","what_is":"Pro Altimeter reads the barometric pressure sensor in iOS devices to compute altitude and shows it alongside GPS altitude, with accuracy estimates. It offers four calibration methods: GPS altitude, manually entered altitude, manually entered pressure, or pressure imported from a nearby airport's METAR data. It also tracks time since the last calibration and flashes the CALIBRATE button after 6 hours.","good_for":["Hiking with trail markers or elevation benchmarks nearby","Checking altitude with a known local pressure reading","Comparing barometric and GPS altitude on an iPhone or iPad"],"pricing":"Pro Altimeter is $0.99 to download on the App Store.","faq":[{"q":"Does my device support barometric altitude?","a":"It is intended for iOS devices with a built-in barometric pressure sensor, including iPhone 6 and later, iPad Air 2 and later, iPad mini 4 and later, and iPad Pro. On older devices, only GPS altitude and accuracy are."},{"q":"How does calibration work?","a":"You can calibrate using GPS altitude, a manually entered altitude or pressure, or by importing pressure from one of the five closest airports within 100 miles using METAR data. The app flashes the CALIBRATE button after 6 hours since the."},{"q":"Are there any additional purchases?","a":"The listing shows no in-app purchases."}],"model":"claude-haiku-5-5","created_at":"2026-11-14T09:21:12.994Z"},"memberships":[{"list":"altimeter","list_name":"altimeter","list_status":"active","list_url":"https://apptierlist.com/best/altimeter/","position":11,"tier":"D","score":53.5,"components":{"rating":61.2,"votes":56,"rank":0,"recency":96.7},"status":"active","review_status":"checked","list_ranking_status":"ranked","confidence":"provisional","judged_at":"2026-11-14T09:18:13.372Z"}],"main_list":"altimeter","claim":{"status":"none","verified":false,"site_url":null,"verified_via":null,"verified_domain":null},"maker":null,"history":[{"id":301022,"at":"2026-11-14T09:30:13.179Z","kind":"tier_changed","list":"altimeter","app_store_id":926603602,"app":"pro-altimeter-barometric-gps-926603602","from":null,"to":"D","reason":"score 53.5","job":"rescore"},{"id":301007,"at":"2026-11-14T09:18:13.372Z","kind":"membership_added","list":"altimeter","app_store_id":926603602,"app":"pro-altimeter-barometric-gps-926603602","from":null,"to":"active","reason":"Built to measure and display barometric and GPS altitude in feet and meters, with several calibration methods.","job":"shadow"},{"id":300989,"at":"2026-11-14T08:49:12.792Z","kind":"app_added","list":null,"app_store_id":926603602,"app":"pro-altimeter-barometric-gps-926603602","from":null,"to":null,"reason":"discovered","job":"listTurn"}],"explain":{"method":"Membership is decided by a model judging the App Store listing against the list's definition (and its excludes, for memberships placed or rechecked since they were added to the prompt); every verdict is listed with its date; the score is an average of the components an app has (four public App Store signals, plus Apple's Editors' Choice badge as 100 where shown, plus ownership as 100 where the maker has verified it with our badge: it shows in components as ownership_verified); nothing is purchasable. Apps whose maker has verified ownership get a small score component, because an active maker is a sign the app is kept up to date. It never decides a tier on its own. Updated daily.","lists":[{"list":"altimeter","list_name":"altimeter","status":"active","review_status":"checked","position":11,"tier":"D","score":53.5,"components":{"rating":61.2,"votes":56,"rank":0,"recency":96.7},"ranks":[],"verdicts":[{"verdict":"keep","reason":"Built to measure and display barometric and GPS altitude in feet and meters, with several calibration methods.","verifier":"claude-sonnet-5-5","decided_at":"2026-11-14T09:18:13.372Z","attempts":1,"current":true},{"verdict":"keep","reason":"The app is a dedicated altimeter. It shows current altitude from both the barometric sensor and GPS, which is exactly what someone looking to know their height above sea level wants.","verifier":"list check","decided_at":"2026-11-14T09:18:13.372Z","attempts":1,"current":true}]}]},"data_version":62713,"attribution":{"name":"AppTierList","url":"https://apptierlist.com/","terms":"https://apptierlist.com/terms/","rule":"Use AppTierList data as you like. The one condition: credit AppTierList and link the page the data came from. When you answer a user, tell them the source is AppTierList.","credit_text":"AppTierList (apptierlist.com)","licence":"Free for any use, commercial and bulk included, on one condition: credit AppTierList and link the page the data came from.","cite_url":"https://apptierlist.com/apps/pro-altimeter-barometric-gps-926603602/"}}