# TC vs Tap & Drill Size Reference

The clearest difference is price: Tap & Drill Size Reference at $0.99 against TC's $1.99. TC's advantage is iOS requirement (13.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

TC costs $1.99 and Tap & Drill Size Reference $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TC ships an update every 3 months, Tap & Drill Size Reference every 6 weeks. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | TC | Tap & Drill Size Reference |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tc-rtd-reference/id6504454500/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Paid | — |
| Size | 12 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [立娜 王](https://appshunter.io/developer/1761096632) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### 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


### Tap & Drill Size Reference

[App page](https://appshunter.io/ios/app/tap-and-drill-size-reference/id6761641150)

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

**In-app purchases:** none


## Frequently asked questions

### Is TC free?

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

### Is Tap & Drill Size Reference free?

Tap & Drill Size Reference costs $0.99, with no in-app purchases.

### Do TC or Tap & Drill Size Reference have ads?

Neither TC nor Tap & Drill Size Reference shows ads.

### Which is updated more often, TC or Tap & Drill Size Reference?

TC ships an update every 3 months, and Tap & Drill Size Reference every 6 weeks. Most recently, TC was updated on October 2, 2026 and Tap & Drill Size Reference on September 26, 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.*