Comparison

Density Altitude + vs SkyTimer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Density Altitude +

This app calculates density altitude and other atmospheric data using location, GPS, and onboard sensors. It's accurate even without a cellular connection and useful for pilots, racers, and sports enthusiasts.

Highlights
  • Density Altitude calculation
  • Relative Air Density (RAD)
  • Altimeter setting
  • Humidity calculations
  • GPS and barometer integration
  • Location search
  • Offline functionality
Features
Currently charting
Read full description

Instant and location accurate Density Altitude calculator/instrument app for iPhone and iPad that also finds relative air density (RAD), altimeter setting, relative humidity, specific humidity (grains/lb) and more. Super useful for pilots, especially in the backcountry. Many other uses for engine tuning, racing, sports, etc. * Seamlessly integrates weather data, GPS and your phone's onboard barometer to quickly and accurately calculate your density altitude, altimeter setting, relative air density, and more. * Takes humidity into account in all calculations, making it more accurate than the typical dry bulb approximation formula used by AWOS/ASOS, etc. * Works anywhere. Great without cellular connection as well, which makes it all the more useful in the backcountry and far away from ASOS/AWOS stations. * Location Search: Find atmospheric data (Density Altitude, etc.) at any point on Earth, from anywhere! Data Sensed and Calculated (all calculated with humidity): * Density Altitude * GPS Altitude * Temperature * Altimeter Setting * Absolute Pressure * Dew Point * Relative Humidity * Specific Humidity (grains/pound) * Air Density * Relative Air Density (RAD) * Dyno Correction The quickest way to get your Density Altitude! On the iPhone 6/6+ and newer iPads, it will use the built-in barometer and GPS. If you're in cell range, you don't need to supply any data. If you're out of cell range, all you need to supply is the outside air temperature. Designed not to need an internet connection, so it will work anytime and anywhere you need it. Great tool for pilots, drag racers, engine tuners, golfers, or anyone who needs to conveniently find their Density Altitude, Altimeter Setting, Relative Aid Density (RAD), Specific Humidity or Absolute Pressure. No ads or in-app purchases. We love feedback! Email us at densityaltitude@rateofclimb.com Disclaimer: Density Altitude+ uses available third party weather and elevation data to calculate atmospheric measurements, but Rate Of Climb does not guarantee that the original sources (including the National Weather Service, FAA and others) have provided data that is accurate, complete, timely, or properly formatted. Users should always contact official sources for the most accurate and timely updates. The service is not intended for use in situations in which the failure of the service could lead to death, personal injury, or severe physical or environmental damage. Your use of this application is at your sole risk.

About

SkyTimer

This app automatically logs flights, tracks fuel burn, and manages tank levels in real-time from your wrist, phone, or iPad. It provides detailed flight logs and can export data, acting as a cockpit companion for pilots.

Highlights
  • Automatic flight logging
  • Real-time fuel tracking
  • Multi-tank and engine support
  • Worldwide airport database
  • Smart fuel balancing
  • Detailed flight logs
  • Cross-device sync
Features
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SkyTimer automatically logs your flights and tracks fuel burn and tank changes in real time--from your wrist, phone, or iPad. A cockpit companion built to work alongside your EFB. Start a flight with a single tap. SkyTimer records block and flight times, tracks fuel quantity across up to 7 tanks and 4 engines, and logs your departure, arrival, and intermediate stop airports using a built-in worldwide airport database--no Internet required. *** FUEL MANAGEMENT, SIMPLIFIED *** SkyTimer calculates fuel burn, endurance, and remaining quantity on-the-fly using time-on-tanks and your configured burn rates. Update flow rates mid-flight for accuracy as conditions change. - Smart Balance calculates optimal tank timer durations to keep fuel balanced across tanks. - A robust reminder engine alerts you to configuration changes based on time-on-tank, fuel use, or fuel transferred. - Supports a wide range of fuel selectors and transfer switch types for single and multi-engine aircraft. *** AUTOMATIC FLIGHT TRACKING *** Smart Track uses GPS ground speed and your aircraft's Vso stall speed to automatically detect takeoffs and landings--no manual input needed. SkyTimer logs the times and airports for you. *** WORKS ON iPHONE, iPAD, AND APPLE WATCH *** Run SkyTimer on your iPad alongside your EFB in Split View, Windowed or Slide Over. On iPhone, Dynamic Island keeps your timers and fuel data visible even while you're in ForeFlight or Garmin Pilot--like a HUD for your flight data. SkyTimer for Apple Watch gives you full access to every feature right from your wrist, and works standalone if you leave your phone on the ground. Everything stays in sync across devices with iCloud. *** DETAILED FLIGHT LOGS *** Every trip is saved with flight and block times, airports, out/off/on/in times, fuel details, time-on-tanks, and Hobbs or Tach times. Export to CSV or directly to LogTen. Everything syncs across your devices with iCloud. *** FREE TO TRY, EASY TO UPGRADE *** Download SkyTimer for free and start tracking block and flight times at no charge. Unlock everything with SkyTimer Plus: - Fuel Quantity Tracking - Unlimited Flight Storage - Tank Timer Management - Auto-Track Takeoffs & Landings - Multiple Aircraft Profiles - iCloud Sync & Backup - In-flight Phone/Watch/iPad Sync --------------------- Price may vary by location. Subscriptions will be charged to your credit card through your App Store account. Your subscription will automatically renew unless cancelled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. After purchase, you can manage your subscriptions in App Store account settings. --------------------- Privacy Policy: https://skytimer.app/privacy/ Terms of Service: https://skytimer.app/terms/

Screenshots

Density Altitude +4 screens
SkyTimer4 screens

Verdict

The call

The clearest difference is price: SkyTimer at Free against Density Altitude +'s $3.99. SkyTimer also leads on update cadence (fortnightly vs every 4 months). Density Altitude +'s advantage is rating (4.8 vs 4.0) and in-app purchases (none vs 2). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

SkyTimer is free to download; Density Altitude + costs $3.99 up front. SkyTimer sells 2 in-app purchases, starting at $2.49 per month. Density Altitude + asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Density Altitude + holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: Density Altitude + has 1K ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 88% of Density Altitude +'s written reviews are positive against 54% of SkyTimer's.

UpkeepUpdate frequency

Density Altitude + ships an update every 4 months, SkyTimer fortnightly. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

Scorecard9 real differences · 2 level
Density Altitude + versus SkyTimer: the parameters behind the verdict, then further details
ParameterDensity Altitude +SkyTimer
Price$3.99Free — better
Rating4.8 (1K ratings) — better4.0 (22 ratings)
Positive reviews87.5% of reviews — better53.8% of reviews
Number of ratings1K — better22
Update frequencyEvery 4 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
Best chart rank#31 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS13.0 — better15.0
Further details — not scored
Size4 MB149 MB
Age rating4+4+
DeveloperRate Of Climb IndustriesFramework Learning, LLC

Customer experience

Density Altitude +

All ratings1,028 ratings
Positive97.3%
Neutral1.6%
Negative1.2%
Written reviews24 reviews
Positive87.5%
Neutral4.2%
Negative8.3%

SkyTimer

All ratings22 ratings
Positive77.3%
Neutral4.5%
Negative18.2%
Written reviews13 reviews
Positive53.8%
Neutral15.4%
Negative30.8%

Bugs and requests

Density Altitude +

Reported bugs

2 issues
  • GPS elevation doesn't always update reliably
  • No way to set altitude

Requested features

4 requests
  • Apple Watch Widget
  • Barometric pressure
  • Relative humidity for current location
  • Ability to manually enter values

SkyTimer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Density Altitude +

No in-app purchases

2 purchases

SkyTimer

Subscriptions2
  • Monthly Plus Subscription$2.491 Month
  • Annual Plus Subscription$17.991 Year

Questions

Is Density Altitude + free?
Density Altitude + costs $3.99, with no in-app purchases.
Is SkyTimer free?
SkyTimer is free to download, with in-app purchases available.
Which has better reviews, Density Altitude + or SkyTimer?
Density Altitude + is rated higher. Density Altitude + averages 4.8 out of 5 from 1K ratings, while SkyTimer averages 4.0 from 22 ratings.
Do Density Altitude + or SkyTimer have ads?
Neither Density Altitude + nor SkyTimer shows ads.
Which is updated more often, Density Altitude + or SkyTimer?
Density Altitude + ships an update every 4 months, and SkyTimer fortnightly. Most recently, Density Altitude + was updated on October 16, 2026 and SkyTimer on October 7, 2026.

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