# NASA PVT+ vs EverLull

The clearest difference is in-app purchases: NASA PVT+ at none against EverLull's 2. EverLull's advantage is update cadence (every 4 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. EverLull sells 2 in-app purchases, starting at $4.99 per month. NASA PVT+ asks for nothing beyond the download.

NASA PVT+ ships an update every 3 months, EverLull every 4 days. The most recent releases landed on November 2, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | NASA PVT+ | EverLull |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (10 ratings)](https://appshunter.io/ios/app/nasa-pvt-plus/id1146834402/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Free | — |
| Size | 31 MB | 55 MB |
| Requires iOS | **13.6** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [lamar brown](https://appshunter.io/developer/6792142201) |

## What reviewers say

### NASA PVT+

[App page](https://appshunter.io/ios/app/nasa-pvt-plus/id1146834402)

This app provides a validated tool for conducting psychomotor vigilance tests, crucial for sleep, alertness, and performance research. It offers multiple study frameworks, including simple tests, basic multi-day studies, and specialized aviation research protocols.

**Highlights:** Psychomotor Vigilance Test (PVT), Karolinska Sleepiness Scale (KSS), Sleep Diary, Simple PVT mode, Basic Study framework, Aviation Study framework

**Features:** Vision Pro support

**In-app purchases:** none


### EverLull

[App page](https://appshunter.io/ios/app/everlull/id6792142199)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EverLull Plus — Monthly | $4.99 | per month |
| EverLull Plus — Yearly | $29.99 | per year |


## Frequently asked questions

### Is NASA PVT+ free?

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

### Is EverLull free?

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

### Do NASA PVT+ or EverLull have ads?

Neither NASA PVT+ nor EverLull shows ads.

### Which is updated more often, NASA PVT+ or EverLull?

NASA PVT+ ships an update every 3 months, and EverLull every 4 days. Most recently, NASA PVT+ was updated on November 2, 2026 and EverLull on November 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.*