# Lockin Security vs HVAC Superheat Calculator

The clearest difference is price: Lockin Security at Free against HVAC Superheat Calculator's $4.99. Lockin Security also leads on iOS requirement (11.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Lockin Security is free to download; HVAC Superheat Calculator costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 5 weeks. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Lockin Security | HVAC Superheat Calculator |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | Every 5 weeks |
| Size | 178 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [LOCKIN INTERNATIONAL PTE. LTD.](https://appshunter.io/developer/1512075715) | [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858) |

## What reviewers say

### Lockin Security

[App page](https://appshunter.io/ios/app/lockin-security/id6557074484)

**Features:** macOS Compatibility

**In-app purchases:** none


### HVAC Superheat Calculator

[App page](https://appshunter.io/ios/app/hvac-superheat-calculator/id6761745516)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lockin Security free?

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

### Is HVAC Superheat Calculator free?

HVAC Superheat Calculator costs $4.99, with no in-app purchases.

### Do Lockin Security or HVAC Superheat Calculator have ads?

Neither Lockin Security nor HVAC Superheat Calculator shows ads.

### Which is updated more often, Lockin Security or HVAC Superheat Calculator?

Lockin Security ships an update every 5 weeks, and HVAC Superheat Calculator every 5 weeks. Most recently, Lockin Security was updated on October 5, 2026 and HVAC Superheat Calculator 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.*