SchemaHD vs Programmer Calculator Lite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SchemaHD
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.
- Draw logic circuit diagrams
- Generate Verilog HDL
- Perform circuit simulations
- Touch-based wiring
- AXI bus interface support
- JSON import/export
- Offline network operation
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FPGAs can dynamically generate logic circuits by means of configuration bit streams generated by languages such as Verilog and VHDL. The generated logic circuit cannot be changed by communication data. Therefore, it is very safe and cannot be attacked by hacking, which is a problem with CPUs, to execute arbitrary commands. In addition, the generated logic circuits are all running simultaneously, so the highest performance parallel processing is being performed. It can also generate logic circuits using configuration bitstreams at very high speed. Most of the processing that can be done by the CPU can be done by the FPGA alone. With advanced security and the highest performace, FPGAs are the perfect device for the modern age. However, it takes a lot of effort to learn languages such as Verilog and VHDL. There are other methods such as high-level synthesis from C/C++, but they require a lot of adjustments such as #pragma, and do not maximize the capabilities of the FPGA. Schematics, not programming languages, are needed to maximize the capabilities of FPGAs and to further improve developer productivity. Schematics allow you to grasp the whole picture at a glance, and can perfectly represent parallel processing. SchemaHD is to draw a circuit diagram of a logic circuit, and it's possible to do generation of Verilog HDL and a simulation. A made circuit diagram can be used by a different circuit diagram immediately. You can also install wiring easily by touch operation. A concept of interface is adopted as a terminal, so something structured of a AXI bus can also be used. A terminal it's also possible to distinguish sound argument reason, negative logic and characteristic wiring of a clock and a reset by interface, and which is different in interface, they don't seem able to connect, it is. You can input and output as a JSON file, so the made circuit diagram and interface are also capable of cooperation with other application. Verilog HDL generated from a circuit diagram contains a comment of a terminal name and an instance name, so it's capable of the correspondence which is at the time of problem occurrence. A network connection isn't needed, so it's also effective in information leak prevention. A simple simulation is offered in the present, but it's expected to enhance it early.
Programmer Calculator Lite
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This developer calculator contains the following features: Instant conversions between number systems: - Binary - Decimal - Octal - Hexadecimal Arithmetic operations: - Addition - Subtraction - Multiplication - Division - Mod Logical operations: - AND - OR - NOT - XOR - INC - DEC - SHL - SHR - ROL - ROR Other features: - Copy (long-press) - Paste (long-press) - Share (long-press) - 8, 8U, 16, 16U, 32, 32U, 64 and 64U bit support - Negative numbers allowed - Support fraction values
Screenshots
Verdict
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.
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. 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.
| Parameter | SchemaHD | Programmer Calculator Lite |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 10 days — better | Every 22 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 16 |
| Further details — not scored | ||
| Size | 2 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Yasuaki Iwasaki | Juan Bustos |
In-app purchases
SchemaHD
- Give a tip #1$1.99
- Give a tip #2$3.99
- Give a tip #3$7.99
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- Give a tip #4$15.99
- Give a tip #5$23.99
- Give a tip #6$39.99
- Give a tip #7$79.99
Programmer Calculator Lite
No in-app purchases
Questions
Is SchemaHD free?
Is Programmer Calculator Lite free?
Do SchemaHD or Programmer Calculator Lite have ads?
Which is updated more often, SchemaHD or Programmer Calculator Lite?
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