# Locklizard Safeguard Viewer vs C172 Performance

The clearest difference is review sentiment: C172 Performance at 90% against Locklizard Safeguard Viewer's 11%. C172 Performance also leads on rating (4.9 vs 1.8) and ratings volume (52 vs 8). Locklizard Safeguard Viewer's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, update cadence, in-app purchases and device support there is nothing between them.

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

C172 Performance holds the better App Store score, 4.9 against 1.8. That said, the two scores are not equally well evidenced: C172 Performance has 52 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 11% of Locklizard Safeguard Viewer's written reviews are positive against 90% of C172 Performance's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Locklizard Safeguard Viewer | C172 Performance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.8 (8 ratings)](https://appshunter.io/ios/app/locklizard-safeguard-viewer/id627385747/reviews) | **[4.9 (52 ratings)](https://appshunter.io/ios/app/c172-performance/id741721884/reviews)** |
| Number of ratings | 8 | **52** |
| Positive reviews | 10.8% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 74 MB | 15 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LockLizard](https://appshunter.io/developer/627385830) | [POH Performance L.L.C.](https://appshunter.io/developer/641403529) |

## What reviewers say

### Locklizard Safeguard Viewer

[App page](https://appshunter.io/ios/app/locklizard-safeguard-viewer/id627385747)

This free application allows users to view protected PDF documents on their iOS devices. It supports secure PDF files that have been protected using specific DRM security software.

**Highlights:** View secure PDF documents, Supports PDC files, DRM protected PDF viewing, iOS compatibility, Free to use

**Features:** macOS Compatibility

**In-app purchases:** none


### C172 Performance

[App page](https://appshunter.io/ios/app/c172-performance/id741721884)

This app calculates essential flight performance data for Cessna 172 and 150 aircraft. It covers takeoff, landing, climb, cruise, descent, instrument procedures, and emergencies, with additional tools for holds and glide calculations. Cloud sync ensures your flight plans are accessible across devices.

**Highlights:** Takeoff and landing calculations, Climb, cruise, and descent performance, Instrument procedure planning, Emergency scenario calculations, Interactive hold calculator, Emergency glide distance calculator, Cloud sync for flight plans

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Locklizard Safeguard Viewer free?

Locklizard Safeguard Viewer is free to download, with no in-app purchases.

### Is C172 Performance free?

C172 Performance is free to download, with no in-app purchases.

### Which has better reviews, Locklizard Safeguard Viewer or C172 Performance?

C172 Performance is rated higher. Locklizard Safeguard Viewer averages 1.8 out of 5 from 8 ratings, while C172 Performance averages 4.9 from 52 ratings.

### Do Locklizard Safeguard Viewer or C172 Performance have ads?

C172 Performance shows ads; Locklizard Safeguard Viewer does not.

### Which is updated more often, Locklizard Safeguard Viewer or C172 Performance?

Locklizard Safeguard Viewer ships an update every 2 months, and C172 Performance every 2 months. Most recently, Locklizard Safeguard Viewer was updated on September 23, 2026 and C172 Performance on September 18, 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.*