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capnpc

v0.25.3 Growing

Cap'n Proto code generation

MIT Edition 2021
#encoding#protocol#serialization

Quick Verdict

  • โœ“Actively maintained (updated 53d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Massive adoption (1.1K crates depend on it)
  • โœ“Tiny footprint (36KB, 1 deps)
  • โœ“Permissive license (MIT)

Security

Checking security advisories...
Downloads
8.5M
Dependents
1.1K
Releases
146
Size
36KB

Deep Insights

๐Ÿ“‰
Download decline

272.1K downloads in the last 30 days, down 44% from the previous period. May indicate migration to alternatives.

๐Ÿ”—
Widely adopted

1.1K crates depend on capnpc. Strong ecosystem adoption means battle-tested code and long-term stability.

โš ๏ธ
Single maintainer risk

capnpc has only 1 owner despite 1.1K dependents. This is a bus-factor concern โ€” consider the implications for long-term support.

๐Ÿ”ฌ
Pre-1.0 for over a year

Despite being 11+ years old, capnpc hasn't reached 1.0 yet. Expect potential API changes between versions.

๐Ÿชถ
Minimal dependencies

Only 1 direct dependencies. Lean dependency tree means faster builds and lower supply chain risk.

๐Ÿ“
Compact crate

At 35KB, capnpc is lightweight. Small crate size correlates with focused, well-scoped functionality.

๐ŸŒŸ
Used by top crates

Notable dependents include sequoia-ipc, sequoia-keystore, exocore-protos, t-rust-less-lib, distrans_peer. When high-quality crates choose capnpc, it's a strong quality signal.

Health Breakdown

Maintenance 16/25

Recency, release consistency, active ratio

Quality 15/25

Yanked ratio, deps, size, maturity, features

Community 11/20

Reverse deps, ownership, ecosystem

Popularity 8/15

Downloads, momentum, growth trend

Documentation 13/15

Docs, repo, license, metadata

Download Trend

Daily downloads ยท last 90 days
15K/day avg-65%
010K20K30K2/263/164/34/215/95/26

Top Dependents

Version Adoption

v0.25.0
79%
v0.25.3
9%
v0.24.1
6%
v0.23.2
4%
v0.23.3
3%

Release Timeline

10 releasessince 2025
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2025
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2026
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README

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Maintainers

Dependencies
1
direct dependencies
Dependents
1.1K
crates depend on capnpc

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