# NASA TLX vs Rayyan

The clearest difference is in-app purchases: NASA TLX at none against Rayyan's 10. NASA TLX also leads on iOS requirement (10.0 vs 15.1). Rayyan's advantage is review sentiment (37% vs 11%) and rating (3.9 vs 3.5). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Rayyan sells 10 in-app purchases, starting at $9.99 per month. NASA TLX asks for nothing beyond the download.

Rayyan holds the better App Store score, 3.9 against 3.5. Both are backed by a comparable volume of ratings — 11 and 25 respectively. Written reviews point the same way: 11% of NASA TLX's written reviews are positive against 37% of Rayyan's.

NASA TLX ships an update every 3 months, Rayyan every 5 weeks. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | NASA TLX | Rayyan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (11 ratings)](https://appshunter.io/ios/app/nasa-tlx/id1168110608/reviews) | **[3.9 (25 ratings)](https://appshunter.io/ios/app/rayyan/id1581620841/reviews)** |
| Number of ratings | 11 | **25** |
| Positive reviews | 11.1% of reviews | **37.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 36 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +17 |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [Rayyan Systems, Inc.](https://appshunter.io/developer/1581620843) |

## What reviewers say

### 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


### Rayyan

[App page](https://appshunter.io/ios/app/rayyan/id1581620841)

This app streamlines systematic literature reviews for researchers, enabling quick article screening and decision-making on mobile devices. It supports offline work and real-time collaboration, significantly reducing review time.

**Highlights:** Offline article screening, Real-time collaboration, Quick inclusion decisions, Reference labeling, Article filtering, Configurable settings

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Student Monthly | $9.99 | per month |
| Professional Monthly | $14.99 | per month |
| Student Quarterly | $24.99 | per 3 months |
| Essential Quarterly | $24.99 | per 3 months |
| Professional Quarterly | $39.99 | per 3 months |
| Advanced Quarterly | $39.99 | per 3 months |
| Student Annual | $59.99 | per year |
| Essential Annual | $59.99 | per year |
| Professional Annual | $99.99 | per year |
| Advanced Annual | $99.99 | per year |


## Frequently asked questions

### Is NASA TLX free?

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

### Is Rayyan free?

Rayyan is free to download, with in-app purchases available.

### Which has better reviews, NASA TLX or Rayyan?

Rayyan is rated higher. NASA TLX averages 3.5 out of 5 from 11 ratings, while Rayyan averages 3.9 from 25 ratings.

### Do NASA TLX or Rayyan have ads?

Neither NASA TLX nor Rayyan shows ads.

### Which is updated more often, NASA TLX or Rayyan?

NASA TLX ships an update every 3 months, and Rayyan every 5 weeks. Most recently, NASA TLX was updated on November 2, 2026 and Rayyan on November 7, 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.*