Comparison

SchemaHD vs Programmer Calculator Lite

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

Programmer Calculator Lite

Features
Read full description

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

Programmer Calculator Lite4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
SchemaHD versus Programmer Calculator Lite: the parameters behind the verdict, then further details
ParameterSchemaHDProgrammer Calculator Lite
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 10 days — betterEvery 22 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPadiPhone, iPad, iPod — better
Requires iOS14.0 — better16
Further details — not scored
Size2 MB10 MB
Age rating4+4+
DeveloperYasuaki IwasakiJuan Bustos

In-app purchases

7 purchases

SchemaHD

One-time7
  • Give a tip #1$1.99
  • Give a tip #2$3.99
  • Give a tip #3$7.99
Show 4 more
  • Give a tip #4$15.99
  • Give a tip #5$23.99
  • Give a tip #6$39.99
  • Give a tip #7$79.99
None

Programmer Calculator Lite

No in-app purchases

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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