# avAltimeter vs TextSonic

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.

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.

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

## The numbers

| Metric | avAltimeter | TextSonic |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.6 (19 ratings)](https://appshunter.io/ios/app/avaltimeter/id1120306812/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 157 MB |
| Requires iOS | 17.6 | **17** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aviametrix, LLC](https://appshunter.io/developer/1120306811) | [Naz Kovalchuk](https://appshunter.io/developer/1756423467) |

## What reviewers say

### avAltimeter

[App page](https://appshunter.io/ios/app/avaltimeter/id1120306812)

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:** Vision Pro support

**In-app purchases:** none


### TextSonic

[App page](https://appshunter.io/ios/app/textsonic-ai-reader/id6743856935)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TextSonic Special Plan | $25.00 | per year |
| TextSonic Annual Plan | $70.00 | per year |
| TextSonic Lifetime Special | $20.00 | one-time |
| TextSonic Lifetime | $70.00 | one-time |


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*