# POLARIE U vs PurpleTracker

The clearest difference is update cadence: POLARIE U at every 2 months against PurpleTracker's every 4 months. POLARIE U also leads on iOS requirement (11.0 vs 14.0). 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.

POLARIE U ships an update every 2 months, PurpleTracker every 4 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | POLARIE U | PurpleTracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/polarie-u/id1489683436/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free | — |
| Size | 5 MB | 79 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Vixen Co.,Ltd.](https://appshunter.io/developer/536188843) | [HUIZHOU REDBOX ELECTRONICS CO,.LTD](https://appshunter.io/developer/1693036399) |

## What reviewers say

### POLARIE U

[App page](https://appshunter.io/ios/app/polarie-u/id1489683436)

This app enhances night sky photography by controlling a star tracker. It offers various rotation speeds, camera shutter control, and advanced imaging modes for creating stunning time-lapses and HDR images of celestial objects.

**Highlights:** Variable rotation speeds, Custom rotation speed settings, Camera shutter control, Shoot-move-shoot function, Accurate star tracking, Bracketed imaging for HDR, Night vision light

**Features:** macOS Compatibility

**In-app purchases:** none


### PurpleTracker

[App page](https://appshunter.io/ios/app/purpletracker/id6737763216)

**In-app purchases:** none


## Frequently asked questions

### Is POLARIE U free?

POLARIE U is free to download, with no in-app purchases.

### Is PurpleTracker free?

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

### Do POLARIE U or PurpleTracker have ads?

Neither POLARIE U nor PurpleTracker shows ads.

### Which is updated more often, POLARIE U or PurpleTracker?

POLARIE U ships an update every 2 months, and PurpleTracker every 4 months. Most recently, POLARIE U was updated on October 24, 2026 and PurpleTracker on October 7, 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.*