iManifold vs Navisizer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iManifold
This app calculates HVAC/R system performance and aids in troubleshooting. It offers a wide selection of refrigerants and equipment profiling for various common systems.
- Calculates HVAC/R system performance
- Troubleshoots system problems
- User input and live system data
- Over 40 selectable refrigerants
- Equipment profiling options
- Customizable for common HVAC/R systems
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The iManifold App Calculates HVAC/R system performance and troubleshoots system problems through user inputs and dynamic, live system data. With over 40 selectable refrigerants and equipment profiling options, the iManifold app can be custom tailored for many common HVAC/R systems in the field.
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.
Screenshots
Verdict
The clearest difference is rating: iManifold at 3.1 against Navisizer's 2.4. iManifold also leads on review sentiment (50% vs 13%) and update cadence (every 3 weeks vs every 4 months). Navisizer's advantage is in-app purchases (none vs 10). On price, ratings volume, ads and device support 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. iManifold sells 10 one-off in-app purchases. Navisizer asks for nothing beyond the download.
iManifold holds the better App Store score, 3.1 against 2.4. Both are backed by a comparable volume of ratings — 38 and 26 respectively. Written reviews point the same way: 50% of iManifold's written reviews are positive against 13% of Navisizer's.
iManifold ships an update every 3 weeks, Navisizer every 4 months. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.
| Parameter | iManifold | Navisizer |
|---|---|---|
| Price | Free | Free |
| Rating | 3.1 (38 ratings) — better | 2.4 (26 ratings) |
| Positive reviews | 50.0% of reviews — better | 12.5% of reviews |
| Number of ratings | 38 — better | 26 |
| Update frequency | Every 3 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.2 |
| Further details — not scored | ||
| Size | 29 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | North Park Innovations Group, Inc. | Navien |
Customer experience
iManifold
Navisizer
In-app purchases
iManifold
- Charge & Airflow Report$0.99
- Mechanical Inspection$0.99
- Equipment Replacement Report$0.99
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- CSV Export$0.99
- Annualized Savings Report$0.99
- Gas Furnace Report$0.99
- iManifold Report Pro - 1 Circuit$1.99
- iManifold Report Pro - 2 Circuit$2.99
- iManifold Report Pro - 3 Circuit$3.99
- iManifold Report Pro - 4 Circuit$4.99
Navisizer
No in-app purchases
