# SchemaHD vs Programmer Calculator Lite

The clearest difference is in-app purchases: Programmer Calculator Lite at none against SchemaHD's 7. Programmer Calculator Lite also leads on device support (3 vs 1). SchemaHD's advantage is ads (none vs shown) and update cadence (every 10 days vs every 22 months). On price there is nothing between them.

Both are free to download. SchemaHD sells 7 one-off in-app purchases. Programmer Calculator Lite asks for nothing beyond the download.

SchemaHD ships an update every 10 days, Programmer Calculator Lite every 22 months. The most recent releases landed on June 6, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | SchemaHD | Programmer Calculator Lite |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/schemahd/id1578851758/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 10 days** | Every 22 months |
| Monetization | Free | — |
| Size | 2 MB | 10 MB |
| Requires iOS | **14.0** | 16 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yasuaki Iwasaki](https://appshunter.io/developer/560857505) | [Juan Bustos](https://appshunter.io/developer/1628019559) |

## What reviewers say

### SchemaHD

[App page](https://appshunter.io/ios/app/schemahd/id1578851758)

This app allows users to draw circuit diagrams for logic circuits, generating Verilog HDL and performing simulations. It simplifies FPGA development by using schematics instead of complex programming languages, offering advanced security and high-performance parallel processing.

**Highlights:** Draw logic circuit diagrams, Generate Verilog HDL, Perform circuit simulations, Touch-based wiring, AXI bus interface support, JSON import/export, Offline network operation

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Give a tip #1 | $1.99 | one-time |
| Give a tip #2 | $3.99 | one-time |
| Give a tip #3 | $7.99 | one-time |
| Give a tip #4 | $15.99 | one-time |
| Give a tip #5 | $23.99 | one-time |
| Give a tip #6 | $39.99 | one-time |
| Give a tip #7 | $79.99 | one-time |


### Programmer Calculator Lite

[App page](https://appshunter.io/ios/app/programmer-calculator-lite/id1628356417)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SchemaHD free?

SchemaHD is free to download, with in-app purchases available.

### Is Programmer Calculator Lite free?

Programmer Calculator Lite is free to download, with no in-app purchases.

### Do SchemaHD or Programmer Calculator Lite have ads?

Programmer Calculator Lite shows ads; SchemaHD does not.

### Which is updated more often, SchemaHD or Programmer Calculator Lite?

SchemaHD ships an update every 10 days, and Programmer Calculator Lite every 22 months. Most recently, SchemaHD was updated on June 6, 2026 and Programmer Calculator Lite on September 16, 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.*