# BT Shutter Kun vs TC

The clearest difference is review sentiment: TC at 100% against BT Shutter Kun's 6%. TC also leads on rating (5.0 vs 2.0) and update cadence (every 3 months vs every 6 months). BT Shutter Kun's advantage is price (Free vs $1.99). On ratings volume, ads, in-app purchases and device support there is nothing between them.

BT Shutter Kun is free to download; TC costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TC holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 6% of BT Shutter Kun's written reviews are positive against 100% of TC's.

BT Shutter Kun ships an update every 6 months, TC every 3 months. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | BT Shutter Kun | TC |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.0 (2 ratings)](https://appshunter.io/ios/app/bt-shutter-kun/id1477004454/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tc-rtd-reference/id6504454500/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 5.6% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 12 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Kaichengyi Technology Co.,Ltd.](https://appshunter.io/developer/1514551405) | [立娜 王](https://appshunter.io/developer/1761096632) |

## What reviewers say

### BT Shutter Kun

[App page](https://appshunter.io/ios/app/bt-shutter-kun/id1477004454)

This app connects via Bluetooth to a specific underwater camera housing, allowing users to control photo and video recording while diving. It's designed for underwater enthusiasts to capture their aquatic experiences.

**Highlights:** Bluetooth connectivity, Underwater photo capture, Underwater video recording, Control camera functions, Record aquatic experiences

**In-app purchases:** none


### TC

[App page](https://appshunter.io/ios/app/tc-rtd-reference/id6504454500)

This utility app provides quick and accurate conversions between resistance, potential, and temperature for various thermocouples and RTDs. It supports offline use, temperature recording with export, and offers an intuitive interface for field technicians and engineers.

**Highlights:** Thermocouple and RTD conversion, Supports multiple sensor types, Offline functionality, Temperature recording and charting, Export data to Excel, Intuitive user interface

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

**In-app purchases:** none


## Frequently asked questions

### Is BT Shutter Kun free?

BT Shutter Kun is free to download, with no in-app purchases.

### Is TC free?

TC costs $1.99, with no in-app purchases.

### Which has better reviews, BT Shutter Kun or TC?

TC is rated higher. BT Shutter Kun averages 2.0 out of 5 from 2 ratings, while TC averages 5.0 from 1 ratings.

### Do BT Shutter Kun or TC have ads?

Neither BT Shutter Kun nor TC shows ads.

### Which is updated more often, BT Shutter Kun or TC?

BT Shutter Kun ships an update every 6 months, and TC every 3 months. Most recently, BT Shutter Kun was updated on October 4, 2026 and TC on October 2, 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.*