letsencrypt/boulder
An ACME-based certificate authority, written in Go. observed · 2026-08-28
Health v2 · maintenance only
95/100
- Activity 99
- Release rhythm 87
- Longevity 100
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: 7
- age_days: 4274
- days_rel: 8
- days_push: 7
- n_releases_24m: 102
Adoption not part of the score
5742 stars · 646 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
Boulder is the Go implementation of an ACME-based certificate authority that powers Let's Encrypt. It automates domain validation and issuance/revocation of TLS certificates via the RFC 8555 ACME protocol, structured as separate gRPC-connected components.
Use cases
- run a private ACME certificate authority
- issue TLS certificates automatically via ACME
- self-host a Let's Encrypt-like CA
- test ACME client implementations against a real CA
- automate certificate issuance and revocation for internal domains
When to choose
- you need to operate your own ACME-compliant CA at scale
- you want a battle-tested, production-proven ACME server implementation
- you need automated domain validation and certificate lifecycle management
When to avoid
- you just need TLS certificates for your own servers - use Let's Encrypt directly with an ACME client like Certbot
- you need a simple internal PKI without ACME - tools like step-ca or smallstep may be simpler
- you are not prepared to run a complex multi-component distributed service
Facets
service · maturity active
security http-server rpc api-framework security backend apis developer-tools go self-hosted acme certificate-authority pki tls rfc8555 lets-encrypt x509 linux docker
1 source
- readme: https://github.com/letsencrypt/boulder · fetched 2026-08-28 · ebfd735a246a
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| letsencrypt/boulder | main | 95 |
For agents
markdown · JSON · MCP: product_card(name="letsencrypt/boulder")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem