Crates / wasmtime-wasi / Alternatives
Rust crate alternatives · data Oct 27, 2026
Alternatives to wasmtime-wasi
Short answerThe closest alternatives to wasmtime-wasi on crates.io data are wasi (2.2M real downloads a day), wasip2 (1.1M real downloads a day), wasip3 (500K real downloads a day). Of the 8 we list, the most used is wasi, and 6 shipped a release in the last year. wasmtime-wasi itself gets 45,200 a day with 389 dependents.
Every alternative we found
| Alternative | Real downloads a day | vs wasmtime-wasi | Dependents | Last release | Why it is listed | |
|---|---|---|---|---|---|---|
| wasi Pulled in | 2,177,567 | 48.18x | 58 | 13mo | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| wasip2 Pulled in | 1,129,868 | 25.00x | 16 | 32d | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| wasip3 Pulled in | 500,046 | 11.06x | 40 | 44d | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| serde-wasm-bindgen Widely used | 191,519 | 4.24x | 1,141 | 2.7y | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| wasmer Established | 9,326 | 0.21x | 145 | 26d | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| wasmer-wasix Pulled in | 3,184 | 0.07x | 22 | 26d | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| fastly Pulled in | 1,113 | 0.02x | 19 | 2mo | category WebAssembly, keyword "wasm", keyword "webassembly" | compare |
| wasmparser Established | 1,023,280 | 22.64x | 431 | 11d | keyword "wasm", keyword "webassembly" | compare |
How to choose
- Same job, not the same API. Each line is listed because it shares a crates.io category or keyword with wasmtime-wasi; read its description before you swap.
- More dependents means more answered questions and a smaller chance it disappears.
- Check the last release against how fast you need fixes. For wasmtime-wasi: is it still maintained?
Rules
Alternatives = tracked crates (top 1000 by downloads) that share a specific crates.io category (2 points each) or keyword (3 points each) with wasmtime-wasi, most similar first; its own parts (same name prefix) and crates it depends on or that depend on it are left out, because those are companions, not substitutes. Real downloads = quiet-day median, crates.io data Oct 27, 2026. Built when we find 3 or more.
Up next
The closest alternative: Few direct dependents and losing ground. 2,177,567 real downloads a day.wasiRust crate. WASI API bindings for Rust. Real use: 2.2M downloads a day on quiet days; 58 crates depend on it.Read it next →Also worth your time
Art: Nicholas Roerich, Nag Lake (1925). Public domain, via Wikimedia Commons.
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