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Comparison · Infra & APIs
authentik vs Stacker
A side-by-side editorial comparison of authentik and Stacker — release velocity, themes, recent moves, and the top alternatives to consider.
authentik vs Stacker: at a glance
What is authentik?
The first patch on 2026.8 is twenty-odd fixes and no new surface.
2026.8.1 is the first patch after the 2026.8 release, and the GitHub tag carries only a link to the docs. The fix list behind it is entirely correctness work: proxy outposts no longer break header parsing in non-compliant backends or double-send the host on token introspection, X-Forwarded-For now takes the rightmost untrusted IP, expression policies stop polluting the request context, and websocket subprotocol negotiation is relayed properly. New installs get a one-day default token duration. Nothing here changes what authentik can do.
What is Stacker?
Stacker's AI agent has absorbed every part of app building except the data itself.
Stacker builds internal tools and customer portals on top of existing data. From late October 2025 the entire changelog is one project: an AI Builder Agent that generates and edits apps by conversation. In under seven weeks it went from generating initial pages and layouts to editing tables and fields, creating lookups, rollups and formulas, reshaping create forms, reordering navigation, building white-labelled external portals with custom domains and permissions, and finally taking a spreadsheet upload and configuring a schema and matching layouts from it.
authentik vs Stacker: editorial side-by-side
authentik
6.3INFRA · APIS
The first patch on 2026.8 is twenty-odd fixes and no new surface.
◆ Current state
2026.8.1 is the first patch after the 2026.8 release, and the GitHub tag carries only a link to the docs. The fix list behind it is entirely correctness work: proxy outposts no longer break header parsing in non-compliant backends or double-send the host on token introspection, X-Forwarded-For now takes the rightmost untrusted IP, expression policies stop polluting the request context, and websocket subprotocol negotiation is relayed properly. New installs get a one-day default token duration. Nothing here changes what authentik can do.
◆ Where it's heading
The release train is behaving as expected after a major: 2026.8.0 landed in mid-August after a long rc series, and the first patch is dominated by outpost and proxy edge cases, which is where authentik meets other people's infrastructure and therefore where the reports come from. The security-adjacent items — X-Forwarded-For parsing, expression context isolation, a shorter default token life — are hardening rather than capability.
◆ Prediction
Patch releases on a fresh major usually run in a short series, so a 2026.8.2 with the remaining outpost reports is the likely next entry. The tag body links to docs rather than describing anything, so nothing further is stated.
Stacker
0.0INFRA · APIS
Stacker's AI agent has absorbed every part of app building except the data itself.
◆ Current state
Stacker builds internal tools and customer portals on top of existing data. From late October 2025 the entire changelog is one project: an AI Builder Agent that generates and edits apps by conversation. In under seven weeks it went from generating initial pages and layouts to editing tables and fields, creating lookups, rollups and formulas, reshaping create forms, reordering navigation, building white-labelled external portals with custom domains and permissions, and finally taking a spreadsheet upload and configuring a schema and matching layouts from it.
◆ Where it's heading
The sequencing is deliberate: each release hands the agent one more thing that previously required the no-code editor, while the company repeatedly reassures users that the full editor still works on AI-built apps. That dual framing — build by conversation, refine by hand — is the position Stacker is defending, and it is a reasonable answer to pure prompt-to-app tools that leave nothing to adjust afterwards. The portal release is the notable widening, since it points the agent at the external-user product rather than internal tools.
◆ Prediction
Every surface except data connection has now been handed to the agent; connecting and mapping an external source — the step still done manually before any of this works — is the remaining gap, and the spreadsheet uploader is the first move toward closing it.
Alternatives to authentik and Stacker
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 authentik or Stacker.
Warp
The essay series keeps running ahead of the products it describes.
Node-RED
Both lines patch on the same day, and the reverted JSONata upgrade finally sticks.
werf
The 3.x line finally ships function: authenticated secret writes and render patches.
Infisical
Folder-level RBAC lands, and approvals finally get a webhook to talk to.
Retool
Retool posts one-line changelog entries, and its agent work is the only visible thread
See all authentik alternatives → · See all Stacker alternatives →
Recent activity from authentik and Stacker
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoauthentik2026.8.1 patches proxy outposts, header parsing, and expressions
- 14d agoauthentikauthentik 2026.8 goes GA with Actors and domain-joined Agents ⚡
- 22d agoauthentikauthentik 2026.8.0-rc7 lands Actors, enterprise Agents, and CAS sources
- 29d agoauthentik2026.8.0-rc6: flaky test and CI metadata fixes
- 1mo agoauthentik2026.8.0-rc5: release plumbing only
- 1mo agoauthentik2026.8.0-rc4: fix-only candidate
- 8mo agoStackerUpload your spreadsheet, let AI do the rest
- 8mo agoStackerBuild customer portals using AI Agent
- 9mo agoStackerReorder your navigation with a conversation
- 9mo agoStackerManage create forms with AI
- 9mo agoStackerAsk the AI Builder Agent to bring in data from other tables
- 9mo agoStackerBuild faster with AI and No-Code, together.
Frequently asked questions
What is the difference between authentik and Stacker?
They serve adjacent needs but don't currently overlap on shipped themes. authentik is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 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 authentik better than Stacker?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. authentik is currently shipping more aggressively (velocity 6.3 vs 0.0), with 1 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 authentik?
Top authentik alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "authentik alternatives" section above for the current picks, or visit /alternatives/authentik for the full list with editorial commentary on each.
What are the best alternatives to Stacker?
Top Stacker alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Stacker alternatives" section above for the current picks, or visit /alternatives/stacker for the full list with editorial commentary on each.