Rust vs. C
Rust vs C for embedded · the 2026 call
Rust for embedded has arrived. When it's safe to pick, when C still wins.
option ARustoption BCserviceCustom software · everything else
→ Verdict
Rust wins on new greenfield projects with modern MCUs (ARM Cortex-M, RISC-V, ESP32). C still wins when you must target legacy toolchains, MISRA-C-certified systems, or sub-16KB flash.
Pick a topic
When to pick which
A · Pick this when…
Rust
- 01New project on ARM Cortex-M / RISC-V / ESP32
- 02Memory-safety matters (safety-critical systems)
- 03Team knows Rust well
- 04No legacy C library lock-in
B · Pick that when…
C
- 01Legacy toolchain (AVR, old PIC, old STM8)
- 02MISRA-C certification required
- 03Sub-16KB flash footprint
- 04Hardware vendor only ships C SDK
Factors to weigh
Factor-by-factor
| Factors to weigh | Rust | C |
|---|---|---|
| Memory safety | Compile-time guaranteed | Runtime surprises |
| MCU support (2026) | Cortex-M, RISC-V, ESP32, RP2040 | Everything |
| Flash footprint | Moderate · ~4KB minimum viable | Tiny · < 1KB possible |
| Async / concurrency | First-class (Embassy) | Manual / RTOS-based |
| MISRA / certification | Limited tooling | Mature ecosystem |
| Learning curve | Steep | Familiar |
| We recommend | New modern MCU work | Legacy / cert-required |
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