# Private Kit vs TAS Viewer

The clearest difference is review sentiment: TAS Viewer at 100% against Private Kit's 32%. Private Kit's advantage is update cadence (every 4 days vs every 2 months) and iOS requirement (9.0 vs 14.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Private Kit ships an update every 4 days, TAS Viewer every 2 months. The most recent releases landed on October 17, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Private Kit | TAS Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (121 ratings)](https://appshunter.io/ios/app/private-kit/id1501903733/reviews)** | — |
| Number of ratings | **121** | — |
| Positive reviews | 32.2% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 months |
| Monetization | Free | Free |
| Size | 32 MB | 32 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Massachusetts Institute of Technology](https://appshunter.io/developer/353590322) | [红杰 李](https://appshunter.io/developer/1602186097) |

## What reviewers say

### Private Kit

[App page](https://appshunter.io/ios/app/private-kit/id1501903733)

This app allows you to log your GPS trails directly on your phone. All data is stored locally and remains private until you choose to export it. It efficiently stores location history with minimal space usage.

**Highlights:** Privacy-first location logging, Local data storage, Manual data export, Efficient data storage, Location import/export

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

**In-app purchases:** none

**What reviewers like**

- 💡 Great idea for contact tracing
- 🔒 Private data logging
- 👍 Appreciated effort by MIT
- 🚀 Potential to slow virus spread
- 👍 Can log location without app open

**What reviewers complain about**

- ❓ Confusing and unclear UI/UX
- 🐛 Frequent app crashes
- 🤷 No idea how to use it
- 📉 Poor execution and polish
- 🚫 No support or response

**Reported bugs**

- App crashes when trying to view movements on map
- Map crashes/closes app before loading
- App crashes when trying to open map
- App crashes when trying to view overlaps
- Map shows zoomed out view and crashes

**Requested features**

- Better howto and help information
- More rigorous and robust app development
- Simple notebook feature for user contacts
- Clearer explanation of map features (green targets, red pins)
- Option to add locations when without phone


### TAS Viewer

[App page](https://appshunter.io/ios/app/tas-viewer/id1605567151)

This application provides tools for the secondary analysis of infrared imaging data. It allows users to examine and interpret thermal images for various purposes.

**Highlights:** Infrared imaging secondary analysis, Thermal image interpretation, Data examination tools

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Private Kit free?

Private Kit is free to download, with no in-app purchases.

### Is TAS Viewer free?

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

### Do Private Kit or TAS Viewer have ads?

Neither Private Kit nor TAS Viewer shows ads.

### Which is updated more often, Private Kit or TAS Viewer?

Private Kit ships an update every 4 days, and TAS Viewer every 2 months. Most recently, Private Kit was updated on October 17, 2026 and TAS Viewer on September 15, 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.*