# AC Calculator vs Robovisor CTRL

The clearest difference is in-app purchases: Robovisor CTRL at none against AC Calculator's 2. Robovisor CTRL also leads on update cadence (every 2 weeks vs every 4 months) and rating (5.0 vs 4.8). AC Calculator's advantage is ratings volume (20 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. AC Calculator sells 2 one-off in-app purchases. Robovisor CTRL asks for nothing beyond the download.

Robovisor CTRL holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: AC Calculator has 20 ratings behind it against 1, so its average is the more settled of the two.

AC Calculator ships an update every 4 months, Robovisor CTRL every 2 weeks. The most recent releases landed on October 18, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | AC Calculator | Robovisor CTRL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (20 ratings)](https://appshunter.io/ios/app/ac-calculator-hvac-sizing/id1537174761/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/robovisor-ctrl/id6478391030/reviews)** |
| Number of ratings | **20** | 1 |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 54 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Melchisedec Martinez Rodriguez](https://appshunter.io/developer/1534398511) | [Robovisor LLC](https://appshunter.io/developer/1732677958) |

## What reviewers say

### AC Calculator

[App page](https://appshunter.io/ios/app/ac-calculator-hvac-sizing/id1537174761)

This utility app simplifies HVAC sizing by calculating BTU/h capacity and recommending equipment. It offers unit conversions, price estimates, and energy consumption comparisons. Advanced features can be unlocked via in-app purchases.

**Highlights:** Calculate BTU/h capacity, Recommend equipment types, Convert BTU, kW, Kcal, Tons, Check price estimates, Compare inverter vs. conventional

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock View details | $4.99 | one-time |
| Unlock Advanced mode | $9.99 | one-time |


### Robovisor CTRL

[App page](https://appshunter.io/ios/app/robovisor-ctrl/id6478391030)

Manage your Robovisor devices with this app. Easily join and accept calls, display survey forms, and show images directly on the device. Future updates will add more web application features.

**Highlights:** Join calls with devices, Accept incoming calls, Display survey forms, Display images, Device management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AC Calculator free?

AC Calculator is free to download, with in-app purchases available.

### Is Robovisor CTRL free?

Robovisor CTRL is free to download, with no in-app purchases.

### Which has better reviews, AC Calculator or Robovisor CTRL?

Robovisor CTRL is rated higher. AC Calculator averages 4.8 out of 5 from 20 ratings, while Robovisor CTRL averages 5.0 from 1 ratings.

### Do AC Calculator or Robovisor CTRL have ads?

Neither AC Calculator nor Robovisor CTRL shows ads.

### Which is updated more often, AC Calculator or Robovisor CTRL?

AC Calculator ships an update every 4 months, and Robovisor CTRL every 2 weeks. Most recently, AC Calculator was updated on October 18, 2026 and Robovisor CTRL on October 7, 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.*