Crates / rolldown
Rust crate · real downloads · data Oct 27, 2026
rolldown downloads, and should you depend on it?
Fast JavaScript bundler in Rust, designed for the future of Vite crates.io · docs.rs · repository
Few direct dependents and gaining.
rolldown: only 28 crates name it directly; small bumps on release days (1.30x 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 paragraphrolldown got 90,863 crates.io downloads from Jul 30, 2026 to Oct 26, 2026. 34% of them landed within 2 days of one of its 15 releases. On the other 61 quiet days it got a median of 901 a day, about 6,307 a week. Capping release days at that baseline leaves 82,168 release-adjusted downloads for the window.
What this means if you're choosing a dependency
- You rarely add this one yourself. Only 28 crates name it directly.
- Actively released. 1.2.15 shipped 6 days ago (Oct 21, 2026).
- Fit check: license MIT, edition 2024 (from the latest version's manifest).
- Compare it by the baseline, not the raw count. 34% of its 90,863 downloads in the window landed within 2 days of a release; the steady number is 901 a day.
Its place in the dependency graph
rolldown builds on
Tracked crates its latest version (1.2.15) depends on (optional ones marked).
What the chart says
- Weekend quiet days ran at 83% of weekday quiet days (772 vs 935). A moderate dip: a mix of work-week builds and always-on automation.
- Biggest day: 2,114 on Sep 2, 2026, inside a release window.
Every number
| All-time downloads | 108,056 (outside the crates.io top 1,000 by all-time downloads) |
| Downloads in the window | 90,863 (Jul 30, 2026 to Oct 26, 2026, 89 days) |
| Within 2 days of a release | 30,984 (34.1%) |
| Quiet-day median (baseline) | 901 a day; weekdays 935, weekends 772 |
| Release-adjusted downloads | 82,168 (release-window days capped at the baseline) |
| Baseline rank | #1193 of the 1243 crates we track |
| Quiet-day trend | +99% raw, +44% against the median tracked crate (+39%) |
| Releases in the window | 15 |
| Versions published, ever | 27 |
| Latest version | 1.2.15, published Oct 21, 2026 (license MIT, edition 2024) |
| First published | Feb 14, 2023 |
| Reverse dependencies | 28 |
Releases in the window
Each one opens a 2-day release window on the chart. Showing the last 12 of 15.
| Version | Published | Downloads that version got (lifetime) |
|---|---|---|
| 1.2.15 | Oct 21, 2026 | 1,248 |
| 1.2.14 | Oct 14, 2026 | 2,462 |
| 1.2.13 | Oct 7, 2026 | 6,838 |
| 1.2.12 | Sep 30, 2026 | 1,654 |
| 1.2.11 | Sep 24, 2026 | 3,053 |
| 1.2.10 | Sep 23, 2026 | 84 |
| 1.2.9 | Sep 16, 2026 | 1,489 |
| 1.2.8 | Sep 9, 2026 | 874 |
| 1.2.7 | Sep 2, 2026 | 1,924 |
| 1.2.6 | Aug 26, 2026 | 1,174 |
| 1.2.5 | Aug 19, 2026 | 3,417 |
| 1.2.4 | Aug 12, 2026 | 1,664 |
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 rolldown 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:
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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/rolldown/downloads (last 90 days, all versions), fetched Oct 27, 2026.
- Versions and publish times: crates.io API, /crates/rolldown/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: 861 a day. Few direct dependents and losing ground.cloudflareRust crate. Rust library for the Cloudflare v4 API. Real use: 861 downloads a day on quiet days; 13 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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