One tool, one price. No subscriptions, no annual renewals, no per-seat surprises.
For individual engineers
One-time payment, yours forever
7-day free trial included with download
For teams up to 5 engineers
One-time — works out to $150/engineer
Instant delivery — license key via email
Up to 10 engineers, one company
One-time — deploy across your entire team
Instant delivery — license key via email
| ModBus Pro | Modbus Poll + Slave | Simply Modbus | |
|---|---|---|---|
| What you get | Master + Slave | Two separate apps | Three separate apps |
| Price for both | $199 | $258 | $162 |
| Includes scripting engine | ✓ | — | — |
| Modern dark UI | ✓ | ✗ Win32 legacy | ✗ Legacy |
| Cross-platform | ✓ Win / Mac / Linux | ✗ Windows only | ✗ Windows only |
| Slave simulator built-in | ✓ | ✗ Separate $129 | ✗ Separate app |
| Auto-discovery | ✓ | ✗ | ✗ |
| Free trial | 7 days (full features) | 30 days (10-min limit) | Demo mode only |
| Pricing model | One-time | One-time | One-time |
One-time purchase. Pay once, use forever. Free updates are included for life. No recurring charges, no annual renewals.
The app locks and asks for a license key. Enter your key to unlock it instantly. No data is lost — your connections, registers, and settings are all preserved.
Yes. Activation requires a one-time internet connection. After that, ModBus Pro works completely offline — perfect for field work on remote sites and air-gapped networks.
Deactivate on your old machine from Settings, then activate on the new one. If you no longer have access to the old machine, contact support and we will reset your activation.
Yes — a 14-day money-back guarantee. If ModBus Pro isn’t the right fit, email support@modbus.app within 14 days of purchase for a full refund.
The 7-day trial is full-featured with no restrictions. After that, a license is required. We believe in giving you the complete experience so you can make an informed decision.
Modbus RTU (serial RS232/RS485) and Modbus TCP/IP. Function codes FC01 through FC06, FC15, FC16, FC22 (Mask Write), and FC23 (Read/Write Multiple).
Windows 10 and 11 today. A macOS version is in development.
Because ModBus Pro is a new independent app, Windows SmartScreen may show a “Windows protected your PC” message the first time you run it. It’s safe — click More info, then Run anyway. The installer downloads directly from our GitHub releases over HTTPS.
Join engineers who have already made the switch.