ICM Omni vs CaptiveAire Toolbox
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ICM Omni
This utility app allows users to reconfigure NFC-compatible devices by adjusting modes and parameters. Save custom settings, read device memory to confirm programming, and replace legacy ICM parts with ease.
- Reconfigure NFC compatible devices
- Adjust device mode and parameters
- Save custom device programs
- Read device memory for confirmation
- Replace legacy ICM parts
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The ICM Omni app supports a new line of NFC compatible products that gives the user the ability to reconfigure their device at will. (See full list of compatible products below.) To program, select your device, then adjust its mode and parameters to fit your application. With all the parameters set, place the back of your phone next to the large NFC logo located on the device and press the Program button. After a brief pause your device is ready to use. Want to confirm that your device programmed successfully? Read the memory of your device to bring up a list of its current mode and parameters. Press the save icon in the top right corner of the parameter screen to save a program for later use. Trying to replace another ICM part? Replace Legacy Product allows you to search for the part you are trying to replace and adjust its parameters accordingly. Compatible products: ICM 5-Wire Timer (ICM-UFPT-5), ICM 2-Wire Timer (ICM-UFPT-2), Universal Head Pressure Control (ICM-325A), Universal Defrost Control (ICM-UDEFROST)
CaptiveAire Toolbox
This app provides over 40 HVAC and building-systems engineering calculators. It's designed for field use, offering standard industry formulas for cooling, heating, ventilation, electrical sizing, and more. Access detailed formula definitions and reference data.
- 40+ HVAC engineering calculators
- Cooling and heating load calculations
- Ventilation and airflow tools
- Electrical sizing and motor circuits
- Duct and piping pressure drop
- Reference data and psychrometric chart
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The CaptiveAire Toolbox puts 40+ HVAC and building-systems engineering calculators in your pocket. Designed for engineers, contractors, and technicians, every formula uses standard industry references (ASHRAE, AMCA, NEC), sized so you can run sanity checks in the field instead of pulling out a laptop. Cooling: Total Cooling Load (enthalpy-based with humidity), Sensible Cooling Load, Latent Cooling Load, SEER, Cost of Cooling, Tons to BTU/hr conversions, DX/MPU Cooling, Evaporative Cooling, DMUA mode logic, Cooling Density Factor. Heating: BTU output for direct and indirect fired heaters, Input and Output BTU/hr for IBT systems, Temperature Rise from BTU and CFM, Heat Pump capacity with airflow and outdoor temperature adjustment, Reheat Coil leaving conditions, Manifold Pressure for natural gas and LP, Heating Density Factor. Ventilation and Airflow: Room Volume CFM, Sensible Heat CFM, Cooling Load CFM, Duct Velocity CFM, Outdoor Air Load (sensible plus latent), Psychrometric properties from dry bulb plus RH or wet bulb, Fan Energy Index per AMCA 208, Motor Adjusted Frequency for VFDs, ERV ROI Calculator with degree-day economics. Electrical Sizing: Wire Size per NEC Table, MCA and MOCP for motor circuits, Amperage from horsepower. Piping and Structural: Round Duct Sizing using Darcy-Weisbach and Colebrook-White, Duct Velocity and Friction, Piping Pressure Drop with fittings equivalent length, Pitched Roof curb height variation. Valve and Flow Sizing: Kv from flow rate, flow rate from Kv, pressure drop from Kv, Cv to Kv conversion, Heat Load to Flow Rate for water and glycol. Reference: ASHRAE Weather Station data with autocomplete address search, returning heating and cooling design temperatures, solar irradiance, wind speeds, and monthly design-day temperatures. Interactive Psychrometric Chart with property calculations. Modern HVAC versus Traditional Rooftop Unit comparison. Each calculator includes the formula and variable definitions accessible from the title bar. Tap the info icon to see exactly what equation drives the result. Built by the engineering team at CaptiveAire Systems. No tracking, no ads, no account required.
Screenshots
Verdict
The clearest difference is update cadence: CaptiveAire Toolbox at weekly against ICM Omni's monthly. ICM Omni's advantage is iOS requirement (14.0 vs 16.0). On price, rating, ratings volume 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.
On the App Store both sit at effectively the same score — 5.0 for ICM Omni against 5.0 for CaptiveAire Toolbox. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
ICM Omni ships an update monthly, CaptiveAire Toolbox weekly. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.
| Parameter | ICM Omni | CaptiveAire Toolbox |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Monthly | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 51 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | ICM Controls Corp | Captive-Aire Systems, Inc. |
Customer experience
ICM Omni
CaptiveAire Toolbox
In-app purchases
ICM Omni
No in-app purchases
CaptiveAire Toolbox
No in-app purchases






