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mcap

v0.25.0 Growing

A library for reading and writing MCAP files

MIT Edition 2021 MSRV 1.81

Quick Verdict

  • โœ“Actively maintained (updated 32d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Trusted by 396 crates
  • !Heavy dependency tree (28 direct deps)
  • โœ“Permissive license (MIT)

Security

Checking security advisories...
Downloads
8.2M
Dependents
396
Releases
37
Size
1.8MB

Deep Insights

๐Ÿ“Š
Stable downloads

515.6K downloads in the last 30 days (17.2K/day). Volume is roughly flat compared to the previous period.

๐Ÿ”—
Moderate adoption

396 crates depend on mcap. Reasonable ecosystem adoption, though not yet a core dependency.

๐Ÿ”ฌ
Pre-1.0 for over a year

Despite being 3+ years old, mcap hasn't reached 1.0 yet. Expect potential API changes between versions.

๐Ÿ“ฆ
Heavy dependency tree

28 direct dependencies. Consider the impact on compile times and supply chain complexity.

๐ŸŒŸ
Used by top crates

Notable dependents include rerun, re_data_loader, re_mcap, foxglove, re_importer. When high-quality crates choose mcap, it's a strong quality signal.

Health Breakdown

Maintenance 17/25

Recency, release consistency, active ratio

Quality 8/25

Yanked ratio, deps, size, maturity, features

Community 12/20

Reverse deps, ownership, ecosystem

Popularity 8/15

Downloads, momentum, growth trend

Documentation 15/15

Docs, repo, license, metadata

Download Trend

Daily downloads ยท last 90 days
16K/day avg-47%
010K20K30K4/265/146/16/197/77/24

Top Dependents

Version Adoption

v0.23.3
67%
v0.23.4
17%
v0.24.0
13%
v0.23.1
2%
v0.25.0
1%

Release Timeline

10 releasessince 2025
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Feature Flags

default =["zstd", "lz4"]

lz4*zstd*tokio

README

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Maintainers

Dependencies
28
direct dependencies
Dependents
396
crates depend on mcap

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