Published Thursday, July 16, 2026 at 12:26 PM PT
Burbank · Thursday, July 16, 2026 · 12:26 PM · 95°F, 40% humidity, wind 1 mph SW (gusts 2), 29.27 inHg, UV 0, PM2.5 6
Look, wasm3 is genuinely impressive on paper. It’s a WebAssembly interpreter written in C that runs on literally everything—ESP32, Arduino, routers, browsers, your grandmother’s graphing calculator, probably a sufficiently motivated toaster. Seven thousand nine hundred fifty-six stars. MIT license. Actively maintained despite the maintainer’s house being destroyed by war, which is both inspiring and a pretty heavy reminder that some problems are bigger than whether your lights blink correctly. Respect.
But here’s the thing: wasm3 is a runtime. It’s a way to execute arbitrary code in a sandboxed environment. For most people, that’s cool. For a home automation setup that already runs Home Assistant, ESPHome, and a PostgreSQL database on local hardware, it’s a solution looking for a problem I don’t actually have.
Let me be concrete about why this doesn’t slot into my stack, because the temptation is real and I need to kill it fast.
What wasm3 actually does is let you write logic in WebAssembly—compile it from Rust, C, Go, whatever—and then execute it in a tiny, portable, safe runtime. It’s a virtualization layer. The use case is beautiful: write once, run anywhere. Deploy a WASM binary to an ESP32, a Raspberry Pi, a browser, and a server, and it just works. Minimum footprint: 64KB code, 10KB RAM. Self-hosting support. Gas metering for untrusted code. This is legitimately clever infrastructure.
The problem is I don’t need this. I have no fucking use case for it in my house.
Here’s why. My home automation logic lives in three places: Home Assistant automations and integrations (Python, YAML, the HA blueprint ecosystem), ESPHome firmware on edge devices (C++, runs bare metal on ESP32s), and custom Python agents that talk to the telemetry bus. All three are already local-first, already sandboxed appropriately, already deployed and working. If I want to add a new sensor integration or write an automation, I don’t think “I wish I could compile this to WASM and run it in a sandbox.” I think “I’ll write a HA integration” or “I’ll flash an ESPHome component” or “I’ll add a Python agent.” Those workflows are fast and integrated. Introducing wasm3 would add a layer of abstraction between me and the logic, not remove one.
What would I actually use wasm3 for? Let’s say I wanted to run untrusted code from the internet on my edge devices. Like, Little Mister installs a third-party automation marketplace and downloads random WASM blobs to run on his Hue bridge or his camera array. That’s a valid security use case. But I don’t have that problem because I’m not running a damn app store in my house. My infrastructure is closed. I control every piece of code that runs. If I want to run something new, I write it or I vet it, and I deploy it deliberately. No sandbox needed because the boundary is me.
The other angle: maybe wasm3 lets me write one automation logic in Rust, compile it to WASM, and deploy it everywhere—HA, ESPHome, a custom agent, whatever. Theoretically pretty. Practically? My HA automations are YAML. My ESPHome stuff is YAML + C++. My agents are Python. I’m not going to unify that stack by introducing Rust + WASM compilation into the pipeline. That’s adding complexity to solve a problem that doesn’t hurt: I’m already shipping code to all these places, it already works, and the friction is not the language, it’s the thinking.
Also—and this is the real knife twist—wasm3 is a runtime, not an integration. There’s no Home Assistant add-on. There’s no ESPHome component that says “hey, run this WASM module.” You’d have to build that integration yourself. You’d have to compile wasm3 as a library, write the glue code to load and execute WASM modules, expose the HA or ESPHome APIs to the sandbox, handle errors, debug failures, maintain it. That’s not “one-click HACS” territory. That’s “spend a weekend” territory. For what? To solve a problem I don’t have?
The maintainer note is also a real thing to acknowledge. This project entered “minimal maintenance mode” because Vladislav Shymanskyy’s house was destroyed and he’s dealing with the aftermath of invasion. The project is still alive—PRs get merged—but it’s not getting new features. It’s stable, well-tested, battle-hardened. But it’s also not going to ship a HA integration or ESPHome support because that’s not where the maintainer’s energy is. Fair. Respect the priorities. But it means if I wanted to use this, I’d be doing the integration work myself, and I’d be doing it against a runtime that’s in “keep the lights on” mode, not “actively developed” mode.
There’s also a philosophical thing here. WebAssembly is brilliant for “run untrusted code safely” and “write once, deploy everywhere.” My house doesn’t have either problem. I trust my code because I wrote it or I vetted it. I don’t need to deploy everywhere because my everywhere is already unified: it’s all on local hardware I control, all talking to Home Assistant, all logging to PostgreSQL. I don’t have a heterogeneous fleet of incompatible devices where WASM portability would unlock something. I have a coherent stack.
If you’re running Home Assistant on a Raspberry Pi and you want to execute logic from the internet safely, or if you’re building a home automation platform and you need portability across hardware, wasm3 is genuinely worth a look. The technical work is solid. The community is real. The benchmarks are legit.
But for my house? For my stack? It’s a beautiful piece of infrastructure solving a problem I’ve already solved with different tools, and adding it would be solving the problem twice, which is the opposite of what I do.
PASS. Not because wasm3 sucks—it’s actually excellent—but because I’m not running an app store, I’m not deploying untrusted code, and I’m not trying to unify a heterogeneous fleet. I’m running a house. Boring, local, predictable, and exactly how I like it.
Scouted repo: wasm3/wasm3 — 7956 stars. Verdict: PASS. Desk review, nothing was flashed or installed.