# iCircuit vs HVAC Psych HD

The clearest difference is review sentiment: iCircuit at 61% against HVAC Psych HD's 0%. iCircuit also leads on price ($12.99 vs $29.99) and update cadence (every 4 weeks vs every 9 months). HVAC Psych HD's advantage is in-app purchases (none vs 2). On ads, monetization model and iOS requirement there is nothing between them.

iCircuit costs $12.99 and HVAC Psych HD $29.99 up front. iCircuit sells 2 in-app purchases, starting at $1.99 per month. HVAC Psych HD asks for nothing beyond the download.

iCircuit ships an update every 4 weeks, HVAC Psych HD every 9 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | iCircuit | HVAC Psych HD |
| --- | --- | --- |
| Price | **$12.99** | $29.99 |
| Rating | **[3.9 (151 ratings)](https://appshunter.io/ios/app/icircuit/id383359044/reviews)** | — |
| Number of ratings | **151** | — |
| Positive reviews | **61.1% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 9 months |
| Monetization | Paid | Paid |
| Best chart rank | **#156** | — |
| Size | 179 MB | 2 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Krueger Systems, Inc.](https://appshunter.io/developer/299293363) | [Carmel Software Corporation](https://appshunter.io/developer/317970398) |

## What reviewers say

### iCircuit

[App page](https://appshunter.io/ios/app/icircuit/id383359044)

**Currently charting:** #156 Top Paid · Education (US App Store)

Design and simulate analog and digital electronic circuits in real-time. This app offers a comprehensive component library, built-in test equipment, and the ability to create custom elements. It's ideal for learning, prototyping, and validating designs without physical components.

**Highlights:** Real-time circuit simulation, Extensive component library (300+), Built-in test equipment (multimeter, oscilloscope), Programmable Arduino and PIC microcontroller support, Custom element creation and sharing, Audio simulation

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iCircuit Pro (Monthly) | $1.99 | per month |
| iCircuit Pro (Yearly) | $14.99 | per year |

**What reviewers like**

- 🚀 Great for learning and testing
- 👍 Intuitive and easy to use
- 💡 Programmable Arduino integration
- 👍 Useful for hobbyists and students

**What reviewers complain about**

- 🐛 Buggy and crashes frequently
- 🔧 Difficult to edit and delete components
- 🔧 Limited component library
- 🔧 Inaccurate simulation results in some cases

**Reported bugs**

- Oscilloscope and meter functions not working properly
- Saving and loading circuits can be unreliable
- Inconsistent behavior when rotating/flipping components
- Crashes when working with larger or more complex circuits

**Requested features**

- More components (e.g. transformers, triodes, MOSFETs)
- Ability to create custom components
- Frequency domain analysis (Bode plots, FFT)
- Improved wiring and component placement controls
- Better support for AC circuits and motors


### HVAC Psych HD

[App page](https://appshunter.io/ios/app/hvac-psych-hd/id582857321)

An interactive psychrometric chart application for iPad, allowing users to plot and customize HVAC processes. Save, email, and manage unlimited projects with both IP and SI units.

**Highlights:** Interactive psychrometric chart, IP and SI unit support, Customizable chart appearance, Finger-based plotting and editing, Save and email charts/data, Unlimited project creation, Zoom and pinch functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iCircuit free?

iCircuit costs $12.99, and also offers in-app purchases.

### Is HVAC Psych HD free?

HVAC Psych HD costs $29.99, with no in-app purchases.

### Do iCircuit or HVAC Psych HD have ads?

Neither iCircuit nor HVAC Psych HD shows ads.

### Which is updated more often, iCircuit or HVAC Psych HD?

iCircuit ships an update every 4 weeks, and HVAC Psych HD every 9 months. Most recently, iCircuit was updated on November 6, 2026 and HVAC Psych HD on November 1, 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.*