# Sona Mobile vs NASA TLX

The clearest difference is rating: NASA TLX at 3.5 against Sona Mobile's 2.7. NASA TLX also leads on iOS requirement (10.0 vs 15.1). Sona Mobile's advantage is review sentiment (20% vs 11%). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NASA TLX holds the better App Store score, 3.5 against 2.7. Both are backed by a comparable volume of ratings — 10 and 11 respectively. Written reviews complicate that: 20% of Sona Mobile's written reviews are positive against 11% of NASA TLX's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 7, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sona Mobile | NASA TLX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (10 ratings)](https://appshunter.io/ios/app/sona-mobile/id562898091/reviews) | **[3.5 (11 ratings)](https://appshunter.io/ios/app/nasa-tlx/id1168110608/reviews)** |
| Number of ratings | 10 | **11** |
| Positive reviews | **20.0% of reviews** | 11.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 38 MB | 17 MB |
| Requires iOS | 15.1 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sona Systems](https://appshunter.io/developer/562898094) | [NASA](https://appshunter.io/developer/355542146) |

## What reviewers say

### Sona Mobile

[App page](https://appshunter.io/ios/app/sona-mobile/id562898091)

This mobile application grants users access to the Sona Systems platform. It is designed for participants, researchers, and principal investigators, requiring the specific URL of a Sona site for functionality.

**Highlights:** Access Sona Systems, For participants, For researchers, For principal investigators, Requires Sona site URL

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### NASA TLX

[App page](https://appshunter.io/ios/app/nasa-tlx/id1168110608)

This app provides a digital tool for researchers to measure subjective workload across various industries. It utilizes a multi-dimensional rating procedure based on six sub-scales to derive an overall workload score. Designed for flexibility, it allows for mobile and contextual assessments, ensuring data privacy and offline usability.

**Highlights:** Subjective workload measurement, Six sub-scale rating procedure, Anonymized data collection, Offline assessment capability, QR code study setup, Location flexibility

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sona Mobile free?

Sona Mobile is free to download, with no in-app purchases.

### Is NASA TLX free?

NASA TLX is free to download, with no in-app purchases.

### Which has better reviews, Sona Mobile or NASA TLX?

NASA TLX is rated higher. Sona Mobile averages 2.7 out of 5 from 10 ratings, while NASA TLX averages 3.5 from 11 ratings.

### Do Sona Mobile or NASA TLX have ads?

Neither Sona Mobile nor NASA TLX shows ads.

### Which is updated more often, Sona Mobile or NASA TLX?

Sona Mobile ships an update every 3 months, and NASA TLX every 3 months. Most recently, Sona Mobile was updated on October 7, 2026 and NASA TLX on October 24, 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.*