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ESPIDFORTH — Forth on bare ESP-IDF, pulled out of Project MAG*Net
ESP32forth ported to ESP-IDF via PlatformIO — no Arduino layer — running on ESP32, S3, C3 and C6. Extracted from Project MAG*Net's Hive AI prototype into a standalone repo so every consumer shares one versioned core.
ESPIDFORTH is ESP32forth ported to ESP-IDF via PlatformIO — a Forth interpreter running natively on the IDF, with no Arduino layer underneath it.
It began as Phase 2 of the Project MAG*Net Hive AI prototype. In August 2026 we lifted it out into a standalone repository with its full history preserved, so that MAG*Net hive nodes and every other consumer share one versioned core instead of drifting copies — the usual fate of an interpreter that lives inside somebody’s application tree.
Targets
| Target | Status |
|---|---|
| ESP32-S3 | Builds — primary target (M5Stack Dial, 8MB PSRAM) |
| ESP32-C3 | Builds, tested on hardware — RISC-V, USB-serial-JTAG console |
| ESP32-C6 | Builds — RISC-V |
| ESP32 | Builds — classic Xtensa |
What you get
Boot the board and you get a versioned banner with build info and memory stats, then an ok> prompt — the core ANS Forth word set, live on the device:
ok> : square dup * ;
ok> 7 square .
49
Arithmetic, the full stack vocabulary, comparison and logic, memory (! @ c! c@ here allot), defining words, and control flow including do/+loop and the begin/while/repeat family. Test suites are compiled in by default and stripped by a build flag: the release build for the C3 is 178 KB, against 184 KB with tests.
Today the engine is a stub implementing that core word set. The full ESP32forth v7.0.8.0 engine is preserved in third_party/ and replaces the stub once its Arduino dependencies are fully stripped.
Apache-2.0. Source on github.com/IoTone/ESPIDFORTH.