# Gastite Sizing App vs NTI net

The clearest difference is review sentiment: Gastite Sizing App at 100% against NTI net's 20%. Gastite Sizing App also leads on monetization model (free vs free with in-app purchases). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Gastite Sizing App ships an update every 3 weeks, NTI net monthly. The most recent releases landed on October 10, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Gastite Sizing App | NTI net |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (79 ratings)](https://appshunter.io/ios/app/nti-net/id1575731502/reviews)** |
| Number of ratings | — | **79** |
| Positive reviews | **100.0% of reviews** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 15 MB | 111 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gastite Systems Limited](https://appshunter.io/developer/1537998855) | [Ariston SpA](https://appshunter.io/developer/549126466) |

## What reviewers say

### Gastite Sizing App

[App page](https://appshunter.io/ios/app/gastite-sizing-app/id1537998852)

This app simplifies calculating the required size of Gastite® CSST for gas installations. Input gas type, CSST length, and appliance power to instantly determine the correct size. It offers easy navigation, user-friendly design, and access to FAQs and installation guides.

**Highlights:** CSST sizing calculation, Natural gas or LPG selection, Access to FAQs, Downloadable installation guide, User-friendly design, Contact support

**Features:** macOS Compatibility

**In-app purchases:** none


### NTI net

[App page](https://appshunter.io/ios/app/nti-net/id1575731502)

Control your home's heating system remotely for enhanced comfort and energy savings. Receive system failure notifications and opt for 24/7 professional assistance with an optional Pro subscription.

**Highlights:** Remote boiler and heat pump control, Temperature adjustment, Energy saving optimization, System failure notifications, 24/7 technical assistance (Pro)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gastite Sizing App free?

Gastite Sizing App is free to download, with no in-app purchases.

### Is NTI net free?

NTI net is free to download, with no in-app purchases.

### Do Gastite Sizing App or NTI net have ads?

Neither Gastite Sizing App nor NTI net shows ads.

### Which is updated more often, Gastite Sizing App or NTI net?

Gastite Sizing App ships an update every 3 weeks, and NTI net monthly. Most recently, Gastite Sizing App was updated on October 10, 2026 and NTI net on October 21, 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.*