Tired of Modbus Poll's $149+/year subscription? ModbusSimulator includes Master and Slave modes, all protocols, and costs $99 once — no renewals, ever.
Windows 10/11 · 30-day free trial · No credit card · No registration
Why pay annually when you can own it forever?
ModbusSimulator vs Modbus Poll (Witte Software)
| Feature | ModbusSimulator | Modbus Poll |
|---|---|---|
| Price | $99 one-time | $149/year (subscription) |
| Free Trial | 30 days — no registration | Limited demo only |
| Master Mode | ✅ Full support | ✅ Full support |
| Slave Mode | ✅ Included (same price) | ❌ Not available |
| Modbus RTU (Serial/RS-485) | ✅ COM ports, virtual COM | ✅ Yes |
| Modbus TCP | ✅ Port 502 or custom | ✅ Yes |
| Modbus ASCII | ✅ Included | ✅ Yes |
| Modbus UDP | ✅ Included | ❌ Extra license needed |
| Real-time Register View | ✅ Coil, DI, IR, HR | ✅ Yes |
| Multiple Data Formats | ✅ Int, float, hex, binary, BCD | ✅ Yes |
| Slave Request Log | ✅ Scrollable log in slave mode | ❌ Master only, no slave logging |
| Fault Simulation | ✅ Exception codes, timeouts | ❌ Limited |
| Diagnostic Mode | ✅ Request/response detail | ✅ Yes |
| OS Support | Windows 10/11 (64-bit) | Windows (32/64-bit) |
| License model | One-time, perpetual | Annual subscription |
| Multi-device support | Up to 8 simultaneous | Varies by version |
Modbus Poll charges $149 every year. ModbusSimulator is $99 once — you own it forever. After 2 years you're already saving money.
Modbus Poll is master-only. To test a full Modbus network, you need a slave simulator too. ModbusSimulator includes both — no second purchase.
When acting as Slave, see every request your master device sends. Essential for debugging PLC communication — Modbus Poll can't do this.
Simulate exception responses, timeouts, and CRC errors to test how your application handles Modbus failures. Critical for robust system testing.
Full-featured trial — no feature locks, no registration. Download, run, test. Buy only when you're convinced it works for your setup.
RTU, TCP, ASCII, UDP — all in the base license. Modbus Poll charges extra for UDP. ModbusSimulator includes everything upfront.
ModbusSimulator replaces all of these with a single, professional Windows application:
Yes. ModbusSimulator covers all core Modbus Poll features (RTU master, TCP master, register monitoring, multiple data formats) and adds features Modbus Poll doesn't have — Slave simulation, fault injection, and a slave request log. The main differences: ModbusSimulator is $99 one-time vs Modbus Poll's $149/year, and includes Slave mode at no extra cost.
Yes. Use com0com (free) to create a virtual COM port pair on Windows. ModbusSimulator connects to one port as Master and the other as Slave for complete RTU simulation without any physical hardware.
Yes. ModbusSimulator exposes a standard Modbus TCP server on port 502 (or custom port) that any SCADA system can connect to as a client. Use it to simulate PLC/field device behavior during SCADA development and testing.
After 30 days, the application will prompt for a license key. All your configurations and test setups are preserved. Purchase a $99 one-time license to continue using the software — no subscription required.
Yes. 3 licenses cost $79 each (save $60 vs buying individually). Contact [email protected] for volume pricing for 5+ licenses.
Currently Windows 10/11 (64-bit) only. Linux and macOS versions are on the roadmap. For non-Windows testing, pymodbus (Python library) is a good alternative for scripting.
30-day free trial · No credit card · Download in 30 seconds
Questions? Email [email protected]