# Amtrol vs Navisizer

The clearest difference is review sentiment: Amtrol at 100% against Navisizer's 13%. Amtrol also leads on rating (5.0 vs 2.4) and iOS requirement (9.0 vs 17.2). Navisizer's advantage is ratings volume (26 vs 1) and update cadence (every 4 months vs every 8 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Amtrol holds the better App Store score, 5.0 against 2.4. That said, the two scores are not equally well evidenced: Navisizer has 26 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Amtrol's written reviews are positive against 13% of Navisizer's.

Amtrol ships an update every 8 months, Navisizer every 4 months. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Amtrol | Navisizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/amtrol/id506006873/reviews)** | [2.4 (26 ratings)](https://appshunter.io/ios/app/navisizer/id1327385997/reviews) |
| Number of ratings | 1 | **26** |
| Positive reviews | **100.0% of reviews** | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 4 months** |
| Monetization | Free | Free |
| Size | 7 MB | 21 MB |
| Requires iOS | **9.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Amtrol, Inc.](https://appshunter.io/developer/506006876) | [Navien](https://appshunter.io/developer/1327385996) |

## What reviewers say

### Amtrol

[App page](https://appshunter.io/ios/app/amtrol/id506006873)

This app provides product sizing, selection, and application support for plumbing, heating, and water systems. Access literature, videos, price books, and technical support for various product lines. It also offers mobile access to the Amtrol Rewards installer points program.

**Highlights:** Product sizing and selection, Application support, Literature and videos, Price book access, Technical support, Rewards installer points program

**Features:** macOS Compatibility

**In-app purchases:** none


### Navisizer

[App page](https://appshunter.io/ios/app/navisizer/id1327385997)

This app helps size domestic hot water heating systems for residential and commercial use. It calculates operating costs, savings, and generates comprehensive job specifications for Navien NPE Series tankless water heaters.

**Highlights:** Residential system sizing, Operating cost and savings calculation, Commercial application sizing (ASHRAE Hunter Curve), Tankless and tankless with storage solutions, Comprehensive job specification output, Save, print, or email system specs

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Amtrol free?

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

### Is Navisizer free?

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

### Which has better reviews, Amtrol or Navisizer?

Amtrol is rated higher. Amtrol averages 5.0 out of 5 from 1 ratings, while Navisizer averages 2.4 from 26 ratings.

### Do Amtrol or Navisizer have ads?

Neither Amtrol nor Navisizer shows ads.

### Which is updated more often, Amtrol or Navisizer?

Amtrol ships an update every 8 months, and Navisizer every 4 months. Most recently, Amtrol was updated on October 10, 2026 and Navisizer on October 5, 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.*