# yACK FAST vs Private Kit

The clearest difference is update cadence: Private Kit at every 4 days against yACK FAST's every 2 months. Private Kit also leads on iOS requirement (9.0 vs 15.6). On price, ads, 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.

yACK FAST ships an update every 2 months, Private Kit every 4 days. The most recent releases landed on October 10, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | yACK FAST | Private Kit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (120 ratings)](https://appshunter.io/ios/app/private-kit/id1501903733/reviews)** |
| Number of ratings | — | **120** |
| Positive reviews | — | 32.2% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 9 MB | 32 MB |
| Requires iOS | 15.6 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Serialio Ltd.](https://appshunter.io/developer/333178140) | [Massachusetts Institute of Technology](https://appshunter.io/developer/353590322) |

## What reviewers say

### yACK FAST

[App page](https://appshunter.io/ios/app/yack-fast/id1166008825)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is yACK FAST free?

yACK FAST is free to download, with no in-app purchases.

### Is Private Kit free?

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

### Do yACK FAST or Private Kit have ads?

Neither yACK FAST nor Private Kit shows ads.

### Which is updated more often, yACK FAST or Private Kit?

yACK FAST ships an update every 2 months, and Private Kit every 4 days. Most recently, yACK FAST was updated on October 10, 2026 and Private Kit on October 21, 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.*