# NASA PVT+ vs PeakPal

The clearest difference is review sentiment: PeakPal at 100% against NASA PVT+'s 25%. PeakPal also leads on rating (5.0 vs 4.8). NASA PVT+'s advantage is price (Free vs $1.99) and update cadence (every 3 months vs every 10 months). On ads, in-app purchases and device support there is nothing between them.

NASA PVT+ is free to download; PeakPal costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PeakPal holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: NASA PVT+ has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 25% of NASA PVT+'s written reviews are positive against 100% of PeakPal's.

NASA PVT+ ships an update every 3 months, PeakPal every 10 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | NASA PVT+ | PeakPal |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [4.8 (10 ratings)](https://appshunter.io/ios/app/nasa-pvt-plus/id1146834402/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/peakpal/id1223237361/reviews)** |
| Number of ratings | **10** | 1 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | **Free** | Paid |
| Size | 31 MB | 1 MB |
| Requires iOS | **13.6** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NASA](https://appshunter.io/developer/355542146) | [Timothy Kelley](https://appshunter.io/developer/1107488020) |

## 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


### PeakPal

[App page](https://appshunter.io/ios/app/peakpal/id1223237361)

Measure the height of distant objects and the angle of slopes using your iPhone's camera and motion processor. This app helps identify the highest point on a mountain, assess avalanche risk with color-coded slope angles, and track climbing steepness. It's designed for backcountry enthusiasts by an experienced Alaskan peakbagger.

**Highlights:** Height comparison of distant objects, Slope angle measurement, Avalanche risk assessment (30-45 degree slopes), Data-embossed summit photos, Cloud height comparison, Developed for backcountry travelers

**In-app purchases:** none


## Frequently asked questions

### Is NASA PVT+ free?

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

### Is PeakPal free?

PeakPal costs $1.99, with no in-app purchases.

### Which has better reviews, NASA PVT+ or PeakPal?

PeakPal is rated higher. NASA PVT+ averages 4.8 out of 5 from 10 ratings, while PeakPal averages 5.0 from 1 ratings.

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

Neither NASA PVT+ nor PeakPal shows ads.

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

NASA PVT+ ships an update every 3 months, and PeakPal every 10 months. Most recently, NASA PVT+ was updated on November 2, 2026 and PeakPal on November 2, 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.*