# Trig Instruments Toolbox vs TC

The clearest difference is review sentiment: TC at 100% against Trig Instruments Toolbox's 50%. TC also leads on rating (5.0 vs 2.6) and update cadence (every 3 months vs every 27 months). Trig Instruments Toolbox's advantage is price (Free vs $1.99) and ratings volume (5 vs 1). On ads, in-app purchases and device support there is nothing between them.

Trig Instruments Toolbox 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 2.6. That said, the two scores are not equally well evidenced: Trig Instruments Toolbox has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Trig Instruments Toolbox's written reviews are positive against 100% of TC's.

Trig Instruments Toolbox ships an update every 27 months, TC every 3 months. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Trig Instruments Toolbox | TC |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [2.6 (5 ratings)](https://appshunter.io/ios/app/trig-instruments-toolbox/id1467103926/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tc-rtd-reference/id6504454500/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 27 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 54 MB | 12 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Stevens Marketing Limited](https://appshunter.io/developer/1467103925) | [立娜 王](https://appshunter.io/developer/1761096632) |

## What reviewers say

### Trig Instruments Toolbox

[App page](https://appshunter.io/ios/app/trig-instruments-toolbox/id1467103926)

This utility app provides a collection of essential field tools, including a ratio to angle converter, inclinometer, tally counter, and protractor. It leverages your device's sensors for accurate estimations and calculations, reducing the need to carry multiple physical instruments.

**Highlights:** Ratio to Angle converter, Inclinometer, Tally counter, Protractor, Uses device sensors for accuracy, New free tools added regularly

**Features:** macOS Compatibility

**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 Trig Instruments Toolbox free?

Trig Instruments Toolbox 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, Trig Instruments Toolbox or TC?

TC is rated higher. Trig Instruments Toolbox averages 2.6 out of 5 from 5 ratings, while TC averages 5.0 from 1 ratings.

### Do Trig Instruments Toolbox or TC have ads?

Neither Trig Instruments Toolbox nor TC shows ads.

### Which is updated more often, Trig Instruments Toolbox or TC?

Trig Instruments Toolbox ships an update every 27 months, and TC every 3 months. Most recently, Trig Instruments Toolbox was updated on October 7, 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.*