# SchemaHD vs SDK85

The clearest difference is rating: SDK85 at 4.0 against SchemaHD's 3.0. SDK85 also leads on in-app purchases (none vs 7). SchemaHD's advantage is iOS requirement (14.0 vs 17.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. SchemaHD sells 7 one-off in-app purchases. SDK85 asks for nothing beyond the download.

SDK85 holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

SchemaHD ships an update every 10 days, SDK85 every 2 weeks. The most recent releases landed on June 6, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SchemaHD | SDK85 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/schemahd/id1578851758/reviews) | **[4.0 (1 ratings)](https://appshunter.io/ios/app/sdk85/id6443719532/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Monetization | Free | Free |
| Size | 2 MB | 12 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Yasuaki Iwasaki](https://appshunter.io/developer/560857505) | [Juergen Schuck](https://appshunter.io/developer/1616701349) |

## 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 |


### SDK85

[App page](https://appshunter.io/ios/app/sdk85/id6443719532)

This app emulates the Intel SDK-85 System Design Kit, allowing users to program and execute 8085 machine code. It features a hexpad, seven-segment display, and a monitor program, with an optional TTY mode for more comfortable input.

**Highlights:** 8085 microprocessor emulation, Hexpad and seven-segment display UI, Monitor program for code entry/execution, TTY mode for serial terminal input, Code execution suspension to save battery, Play/pause button for resuming execution

**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 SDK85 free?

SDK85 is free to download, with no in-app purchases.

### Which has better reviews, SchemaHD or SDK85?

SDK85 is rated higher. SchemaHD averages 3.0 out of 5 from 2 ratings, while SDK85 averages 4.0 from 1 ratings.

### Do SchemaHD or SDK85 have ads?

Neither SchemaHD nor SDK85 shows ads.

### Which is updated more often, SchemaHD or SDK85?

SchemaHD ships an update every 10 days, and SDK85 every 2 weeks. Most recently, SchemaHD was updated on June 6, 2026 and SDK85 on September 18, 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.*