Navisizer vs CertainPath
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Navisizer
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.
- 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
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NaviSizer is designed to assist with sizing of domestic hot water heating systems with Navien NPE Series tankless water heaters. For residential applications, NaviSizer offers system sizing, calculation of operating cost and savings, and provides a comprehensive output to be used as a job spec. For commercial applications, NaviSizer uses ASHREA Hunter Curve calculations to size a broad range of applications. Both tankless and tankless with storage solutions are offered along with a comprehensive system spec that can be saved, printed, or emailed.
CertainPath
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.
- Job dispatching
- View job details
- Work debriefs
- Create invoices
- Field operations management
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The CertainPath app allows technicians to be dispatched to jobs, view information about their jobs, summarize their work with debriefs, and create invoices from the field.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 June 1, 2026 and September 24, 2026 respectively.
| Parameter | Navisizer | CertainPath |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (26 ratings) | 3.4 (12 ratings) — better |
| Positive reviews | 12.5% of reviews | 33.3% of reviews — better |
| Number of ratings | 26 — better | 12 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.2 | 15.6 — better |
| Further details — not scored | ||
| Size | 21 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Navien, Inc. | ServiceLine Technology, LLC |
Customer experience
Navisizer
CertainPath
In-app purchases
Navisizer
No in-app purchases
CertainPath
No in-app purchases
Questions
Is Navisizer free?
Is CertainPath free?
Which has better reviews, Navisizer or CertainPath?
Do Navisizer or CertainPath have ads?
Which is updated more often, Navisizer or CertainPath?
Other comparisons
