# Navisizer vs CertainPath

The clearest difference is rating: CertainPath at 3.4 against Navisizer's 2.4. CertainPath also leads on review sentiment (33% vs 13%) and iOS requirement (15.6 vs 17.2). On price, ratings volume, update cadence and ads there is nothing between them.

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

CertainPath holds the better App Store score, 3.4 against 2.4. Both are backed by a comparable volume of ratings — 26 and 12 respectively. Written reviews point the same way: 13% of Navisizer's written reviews are positive against 33% of CertainPath's.

Navisizer ships an update every 4 months, CertainPath every 3 months. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Navisizer | CertainPath |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (26 ratings)](https://appshunter.io/ios/app/navisizer/id1327385997/reviews) | **[3.4 (12 ratings)](https://appshunter.io/ios/app/certainpath/id1362384627/reviews)** |
| Number of ratings | **26** | 12 |
| Positive reviews | 12.5% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 21 MB | 22 MB |
| Requires iOS | 17.2 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Navien](https://appshunter.io/developer/1327385996) | [ServiceLine Technology, LLC](https://appshunter.io/developer/1362384626) |

## What reviewers say

### 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


### CertainPath

[App page](https://appshunter.io/ios/app/certainpath/id1362384627)

This app helps technicians manage their work in the field. It allows for job dispatch, detailed job information viewing, work summarization through debriefs, and on-the-spot invoice creation.

**Highlights:** Job dispatching, View job details, Work debriefs, Create invoices, Field operations management

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Navisizer free?

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

### Is CertainPath free?

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

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

CertainPath is rated higher. Navisizer averages 2.4 out of 5 from 26 ratings, while CertainPath averages 3.4 from 12 ratings.

### Do Navisizer or CertainPath have ads?

Neither Navisizer nor CertainPath shows ads.

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

Navisizer ships an update every 4 months, and CertainPath every 3 months. Most recently, Navisizer was updated on September 18, 2026 and CertainPath on September 24, 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.*