# SEC Calculator vs Fax Air

The clearest difference is in-app purchases: SEC Calculator at none against Fax Air's 10. SEC Calculator also leads on iOS requirement (11.0 vs 15.6). Fax Air's advantage is update cadence (monthly vs every 27 months). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Fax Air sells 10 in-app purchases, starting at $3.99 per 7 days. SEC Calculator asks for nothing beyond the download.

SEC Calculator ships an update every 27 months, Fax Air monthly. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | SEC Calculator | Fax Air |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 32 MB | 120 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Star Refrigeration Ltd](https://appshunter.io/developer/1571289922) | [Air Apps Systems](https://appshunter.io/developer/1316153435) |

## What reviewers say

### SEC Calculator

[App page](https://appshunter.io/ios/app/sec-calculator/id1571289919)

This tool assists businesses in assessing energy usage and cost reduction through equipment improvements or new system investments. It calculates potential annual savings and CO2 emission reductions, benchmarks sites against best practices, and generates a personalized PDF report.

**Highlights:** Energy usage assessment, Cost reduction calculation, CO2 emission reduction tracking, Site benchmarking, Personalized PDF reports

**Features:** macOS Compatibility

**In-app purchases:** none


### Fax Air

[App page](https://appshunter.io/ios/app/fax-air-scan-and-send-docs/id1608576299)

Easily send documents via fax directly from your mobile device. Scan papers with your camera or upload existing files, add professional cover pages, and track your fax history. Keep your important documents organized and delivered securely.

**Highlights:** Scan documents with camera, Upload files from device, Combine multiple documents, Add custom cover pages, Track fax history, Send faxes from iPhone/iPad

**Features:** macOS Compatibility, Apple Wallet, iMessage stickers, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Air Apps One - 1 Week | $3.99 | per 7 days |
| Air Apps One | $4.99 | per 7 days |
| Air Apps One - 1 Week | $4.99 | per 7 days |
| Air Apps One - 1 Week | $4.99 | per 7 days |
| Air Apps One Welcome - 1 Week | $4.99 | per 7 days |
| Air Apps One - 1 Week | $5.99 | per 7 days |
| Air Apps One | $9.99 | per month |
| Air Apps One - 1 Month | $19.99 | per month |
| Air Apps One | $69.99 | per year |
| Air Apps One - 1 Month | $199.99 | per month |


## Frequently asked questions

### Is SEC Calculator free?

SEC Calculator is free to download, with no in-app purchases.

### Is Fax Air free?

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

### Do SEC Calculator or Fax Air have ads?

Neither SEC Calculator nor Fax Air shows ads.

### Which is updated more often, SEC Calculator or Fax Air?

SEC Calculator ships an update every 27 months, and Fax Air monthly. Most recently, SEC Calculator was updated on November 3, 2026 and Fax Air on November 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*