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capnp-rpc

v0.25.1 Growing

implementation of the Cap'n Proto remote procedure call protocol

MIT Edition 2021

Quick Verdict

  • โœ“Actively maintained (updated 26d ago)
  • !Pre-1.0: API may have breaking changes
  • โœ“Trusted by 167 crates
  • โœ“Tiny footprint (102KB, 3 deps)
  • โœ“Permissive license (MIT)

Security

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Downloads
3.8M
Dependents
167
Releases
94
Size
102KB

Deep Insights

๐Ÿ“Š
Steady growth

65.7K downloads in the last 30 days (2.2K/day), up 3% from the previous period.

๐Ÿ”—
Moderate adoption

167 crates depend on capnp-rpc. Reasonable ecosystem adoption, though not yet a core dependency.

๐Ÿ”ฌ
Pre-1.0 for over a year

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

๐Ÿชถ
Minimal dependencies

Only 3 direct dependencies. Lean dependency tree means faster builds and lower supply chain risk.

๐ŸŒŸ
Used by top crates

Notable dependents include sequoia-ipc, distill-loader, distill-daemon, assemblylift-core-iomod, rain_core. When high-quality crates choose capnp-rpc, it's a strong quality signal.

Health Breakdown

Maintenance 17/25

Recency, release consistency, active ratio

Quality 14/25

Yanked ratio, deps, size, maturity, features

Community 9/20

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
2K/day avg+18%
02K4K6K8K2/263/164/34/215/95/26

Top Dependents

Version Adoption

v0.21.0
49%
v0.25.0
19%
v0.20.3
16%
v0.20.2
14%
v0.25.1
2%

Release Timeline

10 releasessince 2024
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2025
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2026
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README

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Maintainers

Dependencies
3
direct dependencies
Dependents
167
crates depend on capnp-rpc