# Thermistor Tool vs HVAC Expert Advisor

The clearest difference is update cadence: HVAC Expert Advisor at daily against Thermistor Tool's every 10 months. Thermistor Tool's advantage is iOS requirement (13.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Thermistor Tool sells 1 one-off in-app purchase and HVAC Expert Advisor sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

Thermistor Tool ships an update every 10 months, HVAC Expert Advisor daily. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Thermistor Tool | HVAC Expert Advisor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/thermistor-tool/id1641042330/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Daily** |
| Monetization | Free | — |
| Size | 3 MB | 30 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [ROCATECH LLC](https://appshunter.io/developer/1819696394) |

## What reviewers say

### Thermistor Tool

[App page](https://appshunter.io/ios/app/thermistor-tool/id1641042330)

This application serves as a calculator for thermistors, supporting both Beta and Steinhart-Hart models. It facilitates conversions between temperature and resistance, and visualizes this relationship with a temperature-resistance graph. Ideal for hobbyists, students, and engineers.

**Highlights:** Beta model support, Steinhart-Hart model support, Temperature to resistance conversion, Resistance to temperature conversion, Temperature-resistance graph visualization

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro feature | $1.99 | one-time |


### HVAC Expert Advisor

[App page](https://appshunter.io/ios/app/hvac-expert-advisor/id6747071375)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Monthly Plan | $12.99 | per month |
| Basic Annual Plan | $119.99 | per year |


## Frequently asked questions

### Is Thermistor Tool free?

Thermistor Tool is free to download, with in-app purchases available.

### Is HVAC Expert Advisor free?

HVAC Expert Advisor is free to download, with in-app purchases available.

### Do Thermistor Tool or HVAC Expert Advisor have ads?

Neither Thermistor Tool nor HVAC Expert Advisor shows ads.

### Which is updated more often, Thermistor Tool or HVAC Expert Advisor?

Thermistor Tool ships an update every 10 months, and HVAC Expert Advisor daily. Most recently, Thermistor Tool was updated on October 24, 2026 and HVAC Expert Advisor on October 9, 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.*