Comparison

avAltimeter vs TextSonic

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

Head to head
About

avAltimeter

This aviation-focused altimeter app provides accurate altitude readings using built-in pressure sensors. It offers Kollsman adjustment, density altitude calculations, and oxygen requirement warnings for increased flight safety.

Highlights
  • Kollsman adjustment for barometric pressure
  • Density Altitude and True Airspeed calculation
  • Automatic barometric pressure updates from airports
  • Oxygen requirement warnings based on altitude
  • Imperial/Metric unit selection
  • Day/Night illumination modes
Features
Read full description

Simple and Effective! avAltimeter is a digital, aviation-oriented altimeter. It is the only altimeter app which has the Kollsman adjustment so you can adjust the altimeter to the current barometer setting, or to 29.92 inches of mercury for the pressure altitude. Need a quick backup for your panel? avAltimeter uses the latest Apple and Bosch technology built into the iPhone 6 and later models. Earlier models of the iPhone and iPads before iPad Air 2 or Mini 4 do not have the required pressure sensing hardware and do not work. All iPad Pro models work too! Smart! avAltimeter calculates the temperature sensitive Density Altitude. Based on the Density Altitude, the app also calculates True Airspeed as a function of Indicated Airspeed. avAltimeter calculates a rough estimate of the increased required Take-Off distance from that at seal level from increased Density Altitude as well. You can even set the App to obtain automatically obtain the latest barometric pressure from the closest reporting airport. The barometer setting will auto-update every 20 minutes, or if you move more than 25 miles from your previous location. When using the live METAR update feature, the App will display which airport pressure it is using, and how old the reading is. This feature requires an internet connect and active GPS, so it will not work well if you are flying inside a jet. In a jet, the App works great to track the cabin pressure if you just leave the barometric pressure set at 29.92 inHg. Increased Safety! Know your oxygen requirements. avAltimeter tracks your altitude and provides a warning to use oxygen when you exceed FAA mandated limits. Customizable! avAltimeter is customizable. Choose Imperial or Metric units. Set the Altimeter Setting through a popup Kollsman window or by directly setting the field altitude. The field altitude can be set manually or automatically by GPS. Select Day or Night illumination. Turn the audio alarms for oxygen on or off. Improve the take-off performance estimate by selecting your propellor type: constant speed or fixed pitch. Sensitive! The Bosch sensor chip built in to the iPhone 6 and later is sensitive to changes in altitude of three feet or less and has an estimated range from -1500 feet to over 20,000 feet. Unique! Unlike other aviation apps, avAltimeter uses actual barometric pressure to calculate altitude, not a GPS estimate. The barometer is only available in iPhone 6 and later or the iPad iPad Air 2, Mini 4 as well as all iPad Pro! Legal Disclaimer This is an app, not an FAA approved flight instrument. It has not been certified as meeting the relevant TSO specifications. This app can not be used as a primary flight instrument.

About

TextSonic

Transform your documents into audiobooks with AI-powered narration. Customize voices, speed, and languages for a personalized listening experience. Quickly convert text files into natural-sounding audio for learning or entertainment.

Highlights
  • AI-powered text-to-audio conversion
  • Natural, human-like narration
  • Customizable voice, speed, and language
  • Fast document processing
  • Import and listen to documents
  • Create audio playlists
Features
Read full description

HOW TO USE TextSonic: 1) Simply import your document 2) Start listening to it like an audiobook Turn your reading list into a playlist with TextSonic today! WHY CHOOSE TextSonic? SMART: Powered by cutting-edge AI, TextSonic converts your text documents into natural, human-like narration. Whether you're reviewing notes, reading a report, or enjoying a novel, our AI ensures an engaging listening experience. PERSONALIZED: Choose your preferred voice, speed, and even language. TextSonic adapts to your listening style, making it easy to absorb content the way that works best for you. FAST: Get your documents narrated in seconds. Our lightning-fast processing turns even lengthy files into audio in no time—perfect for multitasking or learning on the go. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

avAltimeter4 screens
TextSonic3 screens

Verdict

The call

The clearest difference is review sentiment: TextSonic at 100% against avAltimeter's 50%. TextSonic also leads on price (Free vs $0.99) and update cadence (fortnightly vs every 4 months). avAltimeter's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement 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

TextSonic is free to download; avAltimeter costs $0.99 up front. TextSonic sells 4 in-app purchases, starting at $25.00 per year. avAltimeter asks for nothing beyond the download.

UpkeepUpdate frequency

avAltimeter ships an update every 4 months, TextSonic fortnightly. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

Scorecard5 real differences · 5 level
avAltimeter versus TextSonic: the parameters behind the verdict, then further details
ParameteravAltimeterTextSonic
Price$0.99Free — better
Rating4.6 (19 ratings) — better—
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings19 — better—
Update frequencyEvery 4 monthsFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617 — better
Further details — not scored
Size2 MB157 MB
Age rating4+4+
DeveloperAviametrix, LLCNaz Kovalchuk

Customer experience

avAltimeter

All ratings19 ratings
Positive89.5%
Neutral0.0%
Negative10.5%
Written reviews8 reviews
Positive50.0%
Neutral12.5%
Negative37.5%

TextSonic

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

avAltimeter

No in-app purchases

4 purchases

TextSonic

Subscriptions2
  • TextSonic Special Plan3 Days trial$25.001 Year
  • TextSonic Annual Plan3 Days trial$70.001 Year
One-time2
  • TextSonic Lifetime Special$20.00
  • TextSonic Lifetime$70.00

Questions

Is avAltimeter free?
avAltimeter costs $0.99, with no in-app purchases.
Is TextSonic free?
TextSonic is free to download, with in-app purchases available.
Do avAltimeter or TextSonic have ads?
Neither avAltimeter nor TextSonic shows ads.
Which is updated more often, avAltimeter or TextSonic?
avAltimeter ships an update every 4 months, and TextSonic fortnightly. Most recently, avAltimeter was updated on October 3, 2026 and TextSonic on October 6, 2026.

Other comparisons