Crates / wasmtime
Rust crate · real downloads · data Oct 27, 2026
wasmtime downloads, and should you depend on it?
High-level API to expose the Wasmtime runtime crates.io · docs · repository
Established and losing ground.
wasmtime: 863 crates depend on it; small bumps on release days (1.23x the baseline).
How this verdict is decided (4 rules)
- Usage: crates.io reverse dependencies (crates that list it as a dependency): 10,000+ = foundational, 1,000+ = widely used, 100+ = established, under 100 = few direct dependents.
- Direction: the median quiet day in the last 30 days of the window against the first 30, read against the median tracked crate (the whole field moved +39% from late summer to October, so a raw trend says nothing). 10%+ ahead of the field = gaining; 10%+ behind = losing ground; otherwise steady. Steady with no release in 2+ years = quiet for years.
- Release spikes: the median release-window day against the quiet-day baseline: under 1.15x = no spike, 1.15x to 1.3x = small bumps, 1.3x or more = jumps on release days.
- Release recency: days since the newest version that was not yanked, from crates.io publish times.
release window (release day + next day)quiet dayquiet-day median · download the 89 days as CSV
The numbers in one paragraphwasmtime got 11,869,762 crates.io downloads from Jul 30, 2026 to Oct 26, 2026. 29% of them landed within 2 days of one of its 29 releases. On the other 66 quiet days it got a median of 122,975 a day, about 860,825 a week. Capping release days at that baseline leaves 11,200,026 release-adjusted downloads for the window.
What this means if you're choosing a dependency
- Used, not everywhere. 863 crates depend on it. Look at how fast its issues get answered before you lean on it.
- Actively released. 50.0.0 shipped 7 days ago (Oct 20, 2026).
- Fit check: license Apache-2.0 WITH LLVM-exception, edition 2024, needs Rust 1.97.0 or newer (from the latest version's manifest).
- Compare it by the baseline, not the raw count. 29% of its 11,869,762 downloads in the window landed within 2 days of a release; the steady number is 122,975 a day.
Its place in the dependency graph
Built on wasmtime
1 of the 1243 crates we track depend on it directly (biggest first).
wasmtime builds on
Tracked crates its latest version (50.0.0) depends on (optional ones marked).
What the chart says
- Weekend quiet days ran at 81% of weekday quiet days (105,551 vs 130,080). A moderate dip: a mix of work-week builds and always-on automation.
- Biggest day: 220,489 on Sep 17, 2026, a quiet day with no release nearby.
Every number
| All-time downloads | 41,826,600 (outside the crates.io top 1,000 by all-time downloads) |
| Downloads in the window | 11,869,762 (Jul 30, 2026 to Oct 26, 2026, 89 days) |
| Within 2 days of a release | 3,410,968 (28.7%) |
| Quiet-day median (baseline) | 122,975 a day; weekdays 130,080, weekends 105,551 |
| Release-adjusted downloads | 11,200,026 (release-window days capped at the baseline) |
| Baseline rank | #1017 of the 1243 crates we track |
| Quiet-day trend | +24% raw, -11% against the median tracked crate (+39%) |
| Releases in the window | 29 |
| Versions published, ever | 234 |
| Latest version | 50.0.0, published Oct 20, 2026 (license Apache-2.0 WITH LLVM-exception, edition 2024, MSRV 1.97.0) |
| First published | Oct 30, 2018 |
| Reverse dependencies | 863 |
Releases in the window
Each one opens a 2-day release window on the chart. Showing the last 12 of 29.
| Version | Published | Downloads that version got (lifetime) |
|---|---|---|
| 50.0.0 | Oct 20, 2026 | 39,038 |
| 48.0.7 | Oct 19, 2026 | 159,578 |
| 49.0.4 | Oct 19, 2026 | 156,466 |
| 36.0.19 | Oct 19, 2026 | 47,881 |
| 49.0.3 | Oct 14, 2026 | 126,639 |
| 48.0.6 | Oct 14, 2026 | 166,233 |
| 36.0.18 | Oct 14, 2026 | 43,460 |
| 50.0.0-rc.1 | Oct 5, 2026 | 1,113 |
| 48.0.5 | Oct 2, 2026 | 200,366 |
| 48.0.4 | Oct 2, 2026 | 109,507 |
| 49.0.2 | Oct 2, 2026 | 235,204 |
| 36.0.17 | Oct 2, 2026 | 66,259 |
How we compute this
crates.io counts every download, including CI runners, mirrors and bots that fetch each new version, so raw counts run high (why, in The Manual). We split the last 89 days into release windows (the day a version of wasmtime was published, plus the next day) and quiet days, and use the median quiet day as the baseline: an upper bound on steady use, never a head count. The method and data come from our study of 90 days of crates.io data from 69 crates, featured in This Week in Rust #674; check any crate live with the real-downloads checker.
Badge for your README
Maintainers can show the baseline in a README. It is optional, updates when we refresh the data, and links back here. Preview, then copy:
README, light
README, dark
Publishing a crate of your own? How to publish a Rust crate to crates.io, step by step.
Categories
Sources
- Daily downloads: crates.io API, /crates/wasmtime/downloads (last 90 days, all versions), fetched Oct 27, 2026.
- Versions and publish times: crates.io API, /crates/wasmtime/versions, same fetch.
- Reverse dependencies: crates.io reverse dependencies, same fetch. Dependency edges between tracked crates: each crate's default version, crates.io API.
- Fetched politely (one request every 2 seconds, identified User-Agent) per the crates.io data access policy. Data is crates.io's; the release-window split, baseline and verdict rules are ours, CC BY 4.0.
Up next
Next by real downloads: The next crate down the real-downloads ranking: 122,193 a day. Few direct dependents and steady.remove_dir_allRust crate. A safe, reliable implementation of remove_dir_all for Windows. Real use: 122K downloads a day on quiet days; 84 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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