# Adiabatic Equation Calculator vs Certly

The clearest difference is price: Certly at Free against Adiabatic Equation Calculator's $7.99. Certly also leads on update cadence (every 8 days vs every 19 months). Adiabatic Equation Calculator's advantage is in-app purchases (none vs 2) and iOS requirement (13.0 vs 15.0). On ads and device support there is nothing between them.

Certly is free to download; Adiabatic Equation Calculator costs $7.99 up front. Certly sells 2 in-app purchases, starting at $19.99 per month. Adiabatic Equation Calculator asks for nothing beyond the download.

Adiabatic Equation Calculator ships an update every 19 months, Certly every 8 days. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Adiabatic Equation Calculator | Certly |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 8 days** |
| Monetization | Paid | — |
| Size | 2 MB | 43 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pro Certs Software Ltd](https://appshunter.io/developer/444429696) | [Certly](https://appshunter.io/developer/6773146065) |

## What reviewers say

### Adiabatic Equation Calculator

[App page](https://appshunter.io/ios/app/adiabatic-equation-calculator/id1511222749)

Calculates minimum circuit protective conductor and earth conductor sizes using the adiabatic equation. Input voltage, Zs value, protective device, conductor type, and material to find the minimum CSA in mm².

**Highlights:** Calculate minimum CPC and earth conductor sizes, Uses adiabatic equation formula, Input voltage and Zs value, Select protective device and rating, Select conductor type and material, Provides results in mm²

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

**In-app purchases:** none


### Certly

[App page](https://appshunter.io/ios/app/certly/id6773146063)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Certly Pro - Monthly | $19.99 | per month |
| Certly Pro - Annual | $199.99 | per year |


## Frequently asked questions

### Is Adiabatic Equation Calculator free?

Adiabatic Equation Calculator costs $7.99, with no in-app purchases.

### Is Certly free?

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

### Do Adiabatic Equation Calculator or Certly have ads?

Neither Adiabatic Equation Calculator nor Certly shows ads.

### Which is updated more often, Adiabatic Equation Calculator or Certly?

Adiabatic Equation Calculator ships an update every 19 months, and Certly every 8 days. Most recently, Adiabatic Equation Calculator was updated on October 25, 2026 and Certly on October 31, 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.*