Rust crate alternatives · data Oct 24, 2026
Alternatives to syn
Short answerThe closest alternatives to syn on crates.io data are strum (1.9M real downloads a day), litrs (719K real downloads a day), pin-project-lite (3.3M real downloads a day). Of the 8 we list, the most used is serde_json, and 7 shipped a release in the last year. syn itself gets 8,378,886 a day with 18,848 dependents.
Every alternative we found
| Alternative | Real downloads a day | vs syn | Dependents | Last release | Why it is listed | |
|---|---|---|---|---|---|---|
| strum Widely used | 1,901,257 | 0.23x | 5,075 | 8mo | category Procedural macro helpers, keyword "macros" | side by side |
| litrs Pulled in | 718,877 | 0.09x | 96 | 12d | category Parser implementations, category Procedural macro helpers | compare |
| pin-project-lite Widely used | 3,270,978 | 0.39x | 1,708 | 8mo | keyword "macros" | compare |
| pin-project Widely used | 1,484,314 | 0.18x | 1,406 | 5mo | keyword "macros" | compare |
| paste Widely used | 1,338,247 | 0.16x | 3,246 | 2.5y | keyword "macros" | compare |
| pastey Established | 636,011 | 0.08x | 331 | 5mo | keyword "macros" | compare |
| serde_json Foundational | 4,294,696 | 0.51x | 113,141 | 13d | category Parser implementations | compare |
| shlex Established | 3,284,146 | 0.39x | 754 | 5mo | category Parser implementations | compare |
How to choose
- Same job, not the same API. Each line is listed because it shares a crates.io category or keyword with syn; 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 syn: 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 syn, 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 24, 2026. Built when we find 3 or more.
Up next
The closest alternative: Widely used and steady. 1,901,257 real downloads a day.strumRust crate. Helpful macros for working with enums and strings. Real use: 1.9M downloads a day on quiet days; 5,075 crates depend on it.Read it next →Also worth your time