# XT UART vs Theta

The clearest difference is update cadence: XT UART at every 4 months against Theta's every 19 months. 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.

XT UART ships an update every 4 months, Theta every 19 months. The most recent releases landed on October 16, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | XT UART | Theta |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 19 months |
| Monetization | — | Free |
| Size | 6 MB | 1 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Lanke Xuntong Technology Co., Ltd.](https://appshunter.io/developer/640898259) | [Mikhail Fedorov](https://appshunter.io/developer/714735606) |

## What reviewers say

### XT UART

[App page](https://appshunter.io/ios/app/xt-uart/id1448659811)

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

**In-app purchases:** none


### Theta

[App page](https://appshunter.io/ios/app/theta-meter-watch/id1525336419)

This application measures the electrical resistance of objects when connected to compatible hardware via Bluetooth. It displays changes in resistance using a needle indicator, providing dynamic readings. The app is designed for informational purposes and is not for medical use.

**Highlights:** Bluetooth LE 4.0 connectivity, Measures electrical resistance, Needle indicator for dynamics, Compatible with e-meter hardware, Supports watch, iPhone, and iPod

**In-app purchases:** none


## Frequently asked questions

### Is XT UART free?

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

### Is Theta free?

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

### Do XT UART or Theta have ads?

Neither XT UART nor Theta shows ads.

### Which is updated more often, XT UART or Theta?

XT UART ships an update every 4 months, and Theta every 19 months. Most recently, XT UART was updated on October 16, 2026 and Theta on October 3, 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.*