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Comparison · Infra & APIs
Windmill vs Authelia
A side-by-side editorial comparison of Windmill and Authelia — release velocity, themes, recent moves, and the top alternatives to consider.
Windmill vs Authelia: at a glance
What is Windmill?
Windmill is building a DuckLake data-engineering stack on top of its workflow engine
Windmill has shifted much of its recent output into a DuckLake lakehouse layer — schema contracts, fork-isolated data environments, partition backfills, scheduled maintenance, and freshness watchdogs — while also ungating warehouse runtimes and adding reasoning controls to its AI agent steps. It's a high-cadence open-core product where the substance now sits in data engineering.
What is Authelia?
Authelia's 4.39 line is a long hardening run, not a feature line
Authelia is an open-source authentication and authorization gateway, and the entire recent window is 4.39 point releases. The content is almost exclusively LDAP behaviour, OIDC/OAuth2 error semantics, and access-control evaluation, punctuated by two releases carrying security advisories — one for access-control rules missing a domain match without canonicalization, one for username canonicalization in Basic Auth against LDAP.
Windmill vs Authelia: editorial side-by-side
Windmill
6.3INFRA · APIS
Windmill is building a DuckLake data-engineering stack on top of its workflow engine
◆ Current state
Windmill has shifted much of its recent output into a DuckLake lakehouse layer — schema contracts, fork-isolated data environments, partition backfills, scheduled maintenance, and freshness watchdogs — while also ungating warehouse runtimes and adding reasoning controls to its AI agent steps. It's a high-cadence open-core product where the substance now sits in data engineering.
◆ Where it's heading
The direction is a full data-engineering stack inside Windmill: reproducible pipelines, environment isolation, and observability around DuckLake, with the open-core line steadily loosening as BigQuery and Snowflake move into Community Edition. Expect continued DuckLake maturation and more Community/Enterprise runtime parity, with the heavier automation kept Enterprise.
◆ Prediction
Next likely moves are more DuckLake operational tooling — lineage, alerting, richer backfills — and additional AI-agent-step controls, keeping heavy automation like the freshness watchdog Enterprise-gated.
Authelia
0.0INFRA · APIS
Authelia's 4.39 line is a long hardening run, not a feature line
◆ Current state
Authelia is an open-source authentication and authorization gateway, and the entire recent window is 4.39 point releases. The content is almost exclusively LDAP behaviour, OIDC/OAuth2 error semantics, and access-control evaluation, punctuated by two releases carrying security advisories — one for access-control rules missing a domain match without canonicalization, one for username canonicalization in Basic Auth against LDAP.
◆ Where it's heading
The recurring theme is normalization: several fixes come down to Authelia comparing two strings that mean the same thing and getting a different answer. Domain matching, username canonicalization, issuer suffix checks and AMR consistency are all the same class of bug in different code paths, and they are being closed one at a time rather than by a single refactor. Alongside that, the LDAP client keeps yielding pool deadlocks, referral chasing, and health-check errors under load.
◆ Prediction
Given how many of these fixes cluster on the same identifier-comparison problem, the likely next step is more 4.39 patches in the same two areas — LDAP connection handling and access-control matching — before any 4.40 feature work becomes visible.
Alternatives to Windmill and Authelia
Other Infra & APIs products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Windmill or Authelia.
SuperTokens
SuperTokens is building v12 in canary around one hard problem: migrating existing users
Casdoor
Casdoor ships a minor version per commit, and every one of them is login-flow repair
Buildkite
Buildkite is rebuilding its CI surface for agents first and clearing the v3 baseline out of the way.
Semgrep
Semgrep is spending its releases on parser breadth and scan startup, not new product surface.
Unleash
A marketing blog, not a changelog: Unleash is recasting feature flags as agent governance
See all Windmill alternatives → · See all Authelia alternatives →
Recent activity from Windmill and Authelia
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoWindmillBigQuery and Snowflake available in the community edition
- 7d agoWindmillAI sessions (beta)
- 8d agoWindmillAttach text files to AI chat messages
- 9d agoWindmillWeb search sources in AI chat
- 13d agoWindmillAutomatic git-to-Windmill sync
- 24d agoWindmillSchema contracts for pipeline consumers
- 2mo agoAutheliaSecurity release: access-control and LDAP username canonicalization
- 2mo agoAutheliaLDAP version check, AMR consistency, and stricter domain matching
- 2mo agoAutheliaSecurity fixes plus LDAP discovery and filter-escaping repairs
- 2mo agoAutheliaLDAP health-check errors and unapplied server authz defaults fixed
- 2mo agoAutheliaLDAP connection-pool deadlock and referral chasing fixed
- 2mo agoAutheliaBasic-auth cache and regulation logging fixes
Frequently asked questions
What is the difference between Windmill and Authelia?
They serve adjacent needs but don't currently overlap on shipped themes. Windmill is currently shipping more aggressively (velocity 6.3 vs 0.0), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Windmill better than Authelia?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Windmill is currently shipping more aggressively (velocity 6.3 vs 0.0), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to Windmill?
Top Windmill alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Windmill alternatives" section above for the current picks, or visit /alternatives/windmill for the full list with editorial commentary on each.
What are the best alternatives to Authelia?
Top Authelia alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Authelia alternatives" section above for the current picks, or visit /alternatives/authelia for the full list with editorial commentary on each.