# Density Altitude & Air Density — Dyno correction, RAD & jetting > Advanced calculator for air density and related aviation/automotive performance metrics. (iPhone/iPad app by ISEnet.) - Source: https://appshunter.io/ios/app/density-altitude-and-air-density/id838893833 (this page in markdown: same URL + `.md`) - Developer: [ISEnet](https://appshunter.io/developer/811255764) - Category: Sports, Navigation - Price: $2.99 - Rating: 4.20/5 from 33 App Store ratings · 12 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 1 MB - Languages: American English - Released: 2014-03-20 - Data updated: 2026-08-23 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/density-altitude-and-air-density/id838893833/reviews.md ## What is Density Altitude & Air Density? Air density, density altitude (DA) and relative air density (RAD), computed with the precision that tuning an engine or planning a takeoff actually needs. WHAT IT CALCULATES • Air density (kg/m³, lb/ft³, lb/gal US) • Density altitude • Relative air density (RAD) • Relative horsepower • Dyno correction factor • Dew point • Virtual temperature • Altimeter setting (QNH) • Actual station pressure WHO IT'S FOR Jetting and carburetion. Size your jets on a kart, bike, scooter or race car for the conditions you actually have today, and build proper jetting charts instead of guessing. Dyno testing. Apply the correction factor to compare runs from different days and know how much of the difference was the engine and how much was the air density. Drag racing. Density altitude and RAD for the run, before you stage. Aviation and RC flying. Density altitude and altimeter setting for takeoff performance. For model aircraft, the right nitro mix for the day's conditions. Precision shooting. Track air density through the day and adjust your loads as conditions move. Golf. How far the ball actually carries in today's conditions. LOG THE DAY Record a session and see how conditions change through the day on a chart, with the change since the first reading. Export it as CSV and cross it with your dyno sheet or your load book. POWER CORRECTION Pick the standard your dyno sheet uses: SAE J1349, SAE J607, DIN 70020 or ECE R85. WHERE THE DATA COMES FROM Three sources, and you always know which one you are on. Read the barometer built into your iPhone for the real pressure right where you stand. Pull temperature, pressure and humidity from the nearest weather station, with its name and distance always in view. Or type it all in by hand. Apart from the station lookup, the app needs no connection. ACCURACY Density is solved with the full CIPM/Picard equation, including the compressibility factor and water vapour pressure. This is not an ideal-gas approximation: it's the formula used in metrology. UNITS Pressure in mb, hPa, mmHg or inHg. Temperature in ºC or ºF. Altitude in metres or feet. Density in kg/m³, lb/ft³, lb/gal (US) or gr/ft³ for precision shooting. PRIVACY The app collects nothing. Your readings, sessions and settings stay on your device. There is no analytics, no third-party SDK and no account. The only network request is the weather station lookup, sent over a secure connection with coordinates rounded to about 110 m and no identifier attached. Available in English, Spanish, German, French, Italian, Portuguese, Russian, Japanese, Polish and Dutch. ## Key features - Air density calculation - Density altitude - Relative horsepower - Dew point - GPS and weather station integration - Manual data input - Multiple unit support ## Chart rankings - #152 in Top Paid · Sports (US App Store) ## Recent user reviews (10 of 12) All indexed reviews: https://appshunter.io/ios/app/density-altitude-and-air-density/id838893833/reviews.md ### 4/5 — Use current data. *2023-04-28* Not sure which update it was. But the area you click on to update the current data barely fits on the screen and you can barely update it. I phone 8. Other than that 100%👍🏼🏁 ### 5/5 — Great tool *2020-12-19* Compared to my Longacre air density gauge the results are very reliable. I use this app for jetting carbs and I am really happy with it. ### 5/5 — Easy to use and complete *2020-12-15* Perform all necessary calculations in an easy way. I use it to tune engines and build jetting charts and I find it very useful ### 5/5 — Perfect for getting air density *2020-12-08* I use the app as a RAD gauge and it works really good. Worth the money. ### 5/5 — Great *2020-10-31* I use this for Benchrest shooting to adjust my loads as match progresses during the day. Still learning but is working well ### 5/5 — Air Density *2017-03-05, version 1.5.1* Works great at the races!!! ### 5/5 — Super👀 *2016-10-16* Works well, A+++ ### 3/5 — Hero 1st class *2016-05-31* Seems to work great with WiFi internet connection. Won't get weather using cellular data with no WiFi available. ### 5/5 — Works Great *2016-01-08* I use this tool for flying control line model planes and making sure we have the right mixture of nitro in our fuel. Having enough power to perform well determines if you will place in competition. I also use it to check the humidity before painting my planes. Anything over 50% and the paint hold moisture causing problems. So this is a double duty tool for me. I use it a lot. ### 5/5 — Nice app *2015-10-11* Great app for drag racing - if it were to be able to track and graph over a time like a day at track we think it would replace equipment costing thousands for average racer ## Frequently asked questions about Density Altitude & Air Density ### What is Air Density & RAD meter PRO used for? Air Density & RAD meter PRO calculates essential atmospheric variables such as air density, density altitude, relative horsepower, and dyno correction factors. These are valuable for applications in aviation, dyno testing, and golf. ### How does Air Density & RAD meter PRO get its data? The app can automatically obtain temperature, altitude, humidity, and atmospheric pressure values using your device's GPS and by connecting to the nearest weather station. Alternatively, you can manually input this data. ### What units of measurement does Air Density & RAD meter PRO support? It supports various units, including ºC and ºF for temperatures, meters and feet for altitude, and mb, hPa, mmHg, inHg, and atm for pressures. ### What is the price of Air Density & RAD meter PRO? Air Density & RAD meter PRO is a paid application, priced at $1.99. ### What devices is Air Density & RAD meter PRO available on? The app is compatible with iPhones, iPads, and iPods. ### How often is Air Density & RAD meter PRO updated? The latest version, 2.0, was released on April 13, 2020. Previous updates indicate a history of development since its initial release on March 20, 2014. ### What is the age rating for Air Density & RAD meter PRO? The app has an age rating of 4+. ### Does Air Density & RAD meter PRO have ads? No, Air Density & RAD meter PRO is ad-free. ## Version history (last 5 releases) ### 2.1 — 2026-08-19 Complete rebuild. The app has been rewritten from the ground up for today's iOS. BUILT-IN BAROMETER The app now reads the barometer inside your iPhone and takes the real pressure right where you stand — no network, and no station kilometres away. Everything except the station lookup works with no connection at all. SESSION LOGGING Record how conditions change through the day, with a chart and CSV export. Name your sessions, log by hand or automatically, and see the change since the first reading — the number that tells you whether it is time to adjust. POWER CORRECTION BY STANDARD Choose between SAE J1349, SAE J607, DIN 70020 and ECE R85, so the factor matches the standard on your dyno sheet. WIDER RANGES Now −40 to 60 ºC, −500 to 10 000 m and 500 to 1500 mb. Values outside the old limits used to be clamped without warning, quietly giving a wrong result. Now the app tells you. FOR PRECISION SHOOTING Air density in grains per cubic foot. ALSO • Weather station data over a secure connection, with retry: the failure on cellular data is fixed. • A new screen showing where each reading came from and how old it is. • Choose which reading you want featured at the top. • Dark mode, landscape, iPad Split View, Dynamic Type and VoiceOver. • A new help screen that explains what each reading is for. • Analytics removed: the app no longer collects any data. • New icon. ### 2.0 — 2020-04-13 More values are calculated: dyno correction factor, virtual temperature and altimeter setting. Interface changes for dark mode and iPhone X and newer. ### 1.6 — 2017-03-15 Changes in texts and images ### 1.5.1 — 2015-11-05 Dew point is showed in the results tab. Fixed display bug and network access error in iOS9. ### 1.5 — 2015-08-01 Fixed issue in GPS functionality. ## Apps similar to Density Altitude & Air Density | App | Rating | Price | Category | | --- | --- | --- | --- | | [AirLab: Air Density & Altitude](https://appshunter.io/ios/app/airlab-air-density-and-altitude/id1456458659) | 4.6 (9) | $2.99 | Sports | | [Race Select](https://appshunter.io/ios/app/race-select/id6752685429) | 5.0 (5) | Free | Sports | | [RMFantasy](https://appshunter.io/ios/app/rmfantasy/id6502956634) | 4.3 (56) | Free | Sports | | [dragy Connect](https://appshunter.io/ios/app/dragy-connect/id1260905448) | 2.5 (8) | Free | Sports | | [MyRacePass](https://appshunter.io/ios/app/myracepass/id1177609994) | 4.8 (11,501) | Free | Sports | | [Air Density & Altitude: AirLab](https://appshunter.io/ios/app/air-density-and-altitude-airlab/id1468692831) | 3.4 (19) | Free | Sports | ## More apps by ISEnet - [Jetting Max Kart for Rotax Max](https://appshunter.io/ios/app/jetting-max-kart-for-rotax-max/id811255761) - [Jetting TM Kart for KZ / ICC](https://appshunter.io/ios/app/jetting-tm-kart-for-kz-icc/id825656147) - [Jetting CR125 Shifter Kart](https://appshunter.io/ios/app/jetting-cr125-shifter-kart/id830550109) - [Jetting for KTM 2T Dirt Bikes](https://appshunter.io/ios/app/jetting-for-ktm-2t-dirt-bikes/id836693590) - [Kart Chassis Setup](https://appshunter.io/ios/app/kart-chassis-setup/id885032175) All apps by ISEnet: https://appshunter.io/developer/811255764 ## Related topics [air density](https://appshunter.io/ios/topics/air-density) · [air density online](https://appshunter.io/ios/topics/air-density-online) · [air density & rad meter pro](https://appshunter.io/ios/topics/air-density-rad-meter-pro) · [air density calculator](https://appshunter.io/ios/topics/air-density-calculator) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*