Downloads
One installer, two modes. LadderIDE Sim is free — draw ladder logic, run it in the offline simulator, and watch power flow through your rungs without any hardware at all. A $49.99 license key unlocks Pro, which turns those rungs into an Arduino sketch and puts it on the board.
Windows 10 or 11, 64-bit · about 80 MB · free, no account, no key needed.
Pro purchase opens shortly. Install Sim now — when the store opens, a small update enables activation, and your projects carry straight over.
What you get
The same program either way. The free download does everything up to the line where a sketch leaves for the board; a key opens the rest.
| Feature | Sim | Pro |
|---|---|---|
| Ladder canvas with named, typed tags — the Logix way, not file addresses | ✓ | ✓ |
| Contacts, coils, one-shots, timers, counters, compare, math, CPT, SCP, PID, COP/CPS, convert | ✓ | ✓ |
| Sequencers, bit shift, FIFO/LIFO, motion axes (stepper, servo, DC) | ✓ | ✓ |
| Reusable logic blocks (MBS) and struct types (UDS), portable as files | ✓ | ✓ |
| Offline simulator: force, toggle, trend recording — no hardware needed | ✓ | ✓ |
| Device and shield catalog: I2C sensors, DAC/PWM outputs, Ethernet, serial buses | ✓ | ✓ |
| Quick Start guide and a teaching series of example projects | ✓ | ✓ |
| Generate an Arduino sketch from your ladder program | — | ✓ |
| Compile and upload to the board — arduino-cli and Uno/Nano/Mega support bundled, works offline | — | ✓ |
| PLC communications on the board: EtherNet/IP, Modbus TCP, Modbus RTU, DF1 (MSG) | — | ✓ |
| Get Online: watch live values on the rungs over serial | — | ✓ |
| Price | Free | $49.99 one-time |
First run on Windows
The current installer is not yet code-signed, so Windows SmartScreen may show "Windows protected your PC" the first time you run it. Click More info, then Run anyway. Signing is in progress; this note goes away when it lands.
It installs per user — no administrator password needed, which matters on
a school machine — and takes about 430 MB with the bundled board support.
Your projects live in Documents\LadderIDE and survive an
uninstall.
Already have a key?
Install the same download, then enter the key in the app. The Activation page covers where it goes, how many machines a key covers, and how to move it. Your key and receipts are always in My Orders.
Release notes and support
- Release notes — what is in the current build.
- Changelog — every version, in order.
- Report a problem — or write to support.
- License agreement — the same text the installer shows.