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Comparison · Infra & APIs
Windmill vs Retool
A side-by-side editorial comparison of Windmill and Retool — release velocity, themes, recent moves, and the top alternatives to consider.
Windmill vs Retool: at a glance
What is Windmill?
Windmill hardens its runtime: daemonless containers, SSH execution, dev/prod workspaces.
Windmill is an open-source developer platform that runs scripts, flows, and apps as a workflow and internal-tools engine. Its changelog is a genuine, dense stream of runtime and operations features. The current cluster centers on execution flexibility (containers, remote SSH, SQL S3 inputs), environment safety (dev/prod workspaces), and enterprise observability and governance (OTEL tracing, audit-log export, Kubernetes autoscaling).
What is Retool?
Retool bends its app builder toward AI and external deployment atop the 4.0 self-hosted base
Retool is shipping on two fronts at once: stabilizing the self-hosted 4.0 line (RBAC database migration, stable patches, upgrade FAQs) and steadily modernizing the new app builder. Recent releases add production-grade controls like custom domains and customizable Content Security Policy, alongside AI-adjacent workflow features such as restoring app state from the Chat tab. The classic-to-new-builder migration path keeps widening, now covering custom components and organization-level themes.
Windmill vs Retool: editorial side-by-side
Windmill
6.3INFRA · APIS
Windmill hardens its runtime: daemonless containers, SSH execution, dev/prod workspaces.
◆ Current state
Windmill is an open-source developer platform that runs scripts, flows, and apps as a workflow and internal-tools engine. Its changelog is a genuine, dense stream of runtime and operations features. The current cluster centers on execution flexibility (containers, remote SSH, SQL S3 inputs), environment safety (dev/prod workspaces), and enterprise observability and governance (OTEL tracing, audit-log export, Kubernetes autoscaling).
◆ Where it's heading
Windmill is maturing along two tracks at once: a more capable, safer execution runtime (sandboxed multi-tenant containers without a Docker daemon, remote SSH targets) and the enterprise scaffolding around it (environment promotion, distributed tracing, audit export, smarter K8s scale-in). The direction is making the platform safe to run untrusted, multi-tenant code at scale while giving teams real dev/prod discipline.
◆ Prediction
Expect continued investment in isolation/runtime breadth and enterprise operability — more sandboxing options, deeper observability, and workspace/promotion tooling. The cadence is fast and consistent, with the daemonless container runtime the most likely lever for new multi-tenant and cloud use cases.
Retool
6.3INFRA · APIS
Retool bends its app builder toward AI and external deployment atop the 4.0 self-hosted base
◆ Current state
Retool is shipping on two fronts at once: stabilizing the self-hosted 4.0 line (RBAC database migration, stable patches, upgrade FAQs) and steadily modernizing the new app builder. Recent releases add production-grade controls like custom domains and customizable Content Security Policy, alongside AI-adjacent workflow features such as restoring app state from the Chat tab. The classic-to-new-builder migration path keeps widening, now covering custom components and organization-level themes.
◆ Where it's heading
The direction is a Retool that treats internally-built apps as deployable products rather than internal-only tools, with custom domains and CSP controls pointing at externally-facing use. In parallel the platform is absorbing agentic building through MCP app import and chat-driven edits and restores, and metering AI usage via credit packs. The self-hosted 4.0 groundwork suggests enterprise governance is the near-term priority.
◆ Prediction
Expect the classic-app conversion path to keep closing gaps until the old builder is deprecated, and for the 4.0 RBAC plumbing to surface as a user-facing permissions layer. AI-driven building looks set to deepen rather than plateau.
Alternatives to Windmill and Retool
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 Retool.
Resend
Resend ships a tight, frequent changelog: richer email content and deeper dev-tool reach
Unleash
Unleash reframes feature flags as agentic 'runtime control,' aimed straight at LaunchDarkly.
ToolJet
ToolJet widens its data-source layer — AI sources included — on a fast LTS/beta release train.
GitHub
GitHub bends toward enterprise AI governance while retiring its standalone Models offering.
Bugsnag
BugSnag is compounding on mobile observability and AI-assisted debugging
See all Windmill alternatives → · See all Retool alternatives →
Recent activity from Windmill and Retool
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoWindmillWorkspace DuckDB macro libraries
- 1d agoWindmillBackfill a range of partitions from the asset drawer
- 2d agoRetoolImprovements to classic app conversion
- 2d agoWindmillSCD2 history strategy for DuckLake materialization
- 2d agoWindmillLocal development for data pipelines
- 3d agoWindmillDev workspaces paired with a lockable prod workspace
- 4d agoRetoolPublishing apps on custom domains
- 9d agoRetoolSelf-hosted Retool 4.0 and 3.334 stable updates
- 9d agoRetoolCustomize the Content Security Policy for apps
- 9d agoRetoolRestore changes from chat
- 16d agoRetoolSelf-hosted Retool 4.0 stable update
- 23d agoWindmillKubernetes autoscaling scale-in prefers idle worker pods
Frequently asked questions
What is the difference between Windmill and Retool?
They serve adjacent needs but don't currently overlap on shipped themes. Windmill and Retool are shipping at a similar cadence (velocity 6.3 vs 6.3, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Windmill better than Retool?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Windmill and Retool are shipping at a similar cadence (velocity 6.3 vs 6.3, both within Sparkpulse's "active" band). 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 Retool?
Top Retool alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Retool alternatives" section above for the current picks, or visit /alternatives/retool for the full list with editorial commentary on each.