# Carrier eServices vs Navisizer

The clearest difference is update cadence: Navisizer at every 4 months against Carrier eServices's every 32 months. Carrier eServices's advantage is iOS requirement (8.0 vs 17.2). On price, ads, in-app purchases and device support there is nothing between them.

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

Carrier eServices ships an update every 32 months, Navisizer every 4 months. The most recent releases landed on October 19, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Carrier eServices | Navisizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.4 (26 ratings)](https://appshunter.io/ios/app/navisizer/id1327385997/reviews)** |
| Number of ratings | — | **26** |
| Positive reviews | — | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 4 months** |
| Monetization | — | Free |
| Size | 3 MB | 21 MB |
| Requires iOS | **8.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [lise GmbH](https://appshunter.io/developer/514337209) | [Navien](https://appshunter.io/developer/1327385996) |

## What reviewers say

### Carrier eServices

[App page](https://appshunter.io/ios/app/carrier-eservices/id514337006)

**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 Carrier eServices free?

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

### Is Navisizer free?

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

### Do Carrier eServices or Navisizer have ads?

Neither Carrier eServices nor Navisizer shows ads.

### Which is updated more often, Carrier eServices or Navisizer?

Carrier eServices ships an update every 32 months, and Navisizer every 4 months. Most recently, Carrier eServices was updated on October 19, 2026 and Navisizer on October 22, 2026.

---

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