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Comparison · Infra & APIs
Ably vs Windmill
A side-by-side editorial comparison of Ably and Windmill — release velocity, themes, recent moves, and the top alternatives to consider.
Ably vs Windmill: at a glance
| Feature | Ably | Windmill |
|---|---|---|
| Sector | Infra & APIs | Infra & APIs |
| Velocity score | 6.3 | 7.5 |
| Sparks · 30d | 1 | 2 |
| Top themes | real-time-infra, liveobjects, agentic-ai, pub-sub | workflow-automation, ai-agents, devtools, dbt |
| Last editorial update | 1d ago | 4d ago |
| Website | — | Visit → |
What is Ably?
Ably graduates LiveObjects to stable across Java and iOS SDKs, completing its real-time state-sync layer for AI agent deployments.
Ably has spent the past two months landing its LiveObjects feature—a path-based API for managing fast-changing shared state—across its major client SDKs. Java SDK v1.8.1 marks the last major platform leaving experimental, following the Cocoa/Swift SDK in early September. In parallel, the AI Transport JS SDK has grown Temporal workflow support and Vercel AI SDK v7 compatibility, and the Terraform provider reached v1.1.0 with significant new surface area including moderation rules and before-publish hooks.
What is Windmill?
Windmill is building a full AI-native workflow platform — guest app access, agent evals, dbt runtime, and AI cost tracking shipped in rapid succession.
Windmill is an open-source workflow automation and developer platform that has been adding AI capabilities at an accelerating rate. The last month brought AI agent evaluations (with dataset-based scoring and run comparison), AI usage and cost tracking per user and model, a Plan mode for AI sessions (read-only investigation posture), version history for both AI artifacts and resource values, and nested filter groups for Kafka and WebSocket triggers. The platform now spans workflow orchestration, AI-assisted script writing, and a native dbt runtime.
Ably vs Windmill: editorial side-by-side
Ably
6.3INFRA · APIS
Ably graduates LiveObjects to stable across Java and iOS SDKs, completing its real-time state-sync layer for AI agent deployments.
◆ Current state
Ably has spent the past two months landing its LiveObjects feature—a path-based API for managing fast-changing shared state—across its major client SDKs. Java SDK v1.8.1 marks the last major platform leaving experimental, following the Cocoa/Swift SDK in early September. In parallel, the AI Transport JS SDK has grown Temporal workflow support and Vercel AI SDK v7 compatibility, and the Terraform provider reached v1.1.0 with significant new surface area including moderation rules and before-publish hooks.
◆ Where it's heading
Ably is building toward becoming the real-time infrastructure layer for agentic AI systems: LiveObjects handles shared state across multiple agents; the AI Transport SDK handles the run lifecycle (turn framing, Temporal orchestration); the new E2E encryption for annotation payloads closes a security gap in the model. The direction is away from general-purpose pub/sub toward targeted infrastructure that connects AI agents to each other and to human-facing interfaces.
◆ Prediction
The next likely move is developer experience work around multi-agent state coordination—LiveObjects is now stable but production wiring patterns are probably still rough. Expect documentation, example patterns, and possibly a managed agent-state abstraction built on top of the stable API.
Windmill
7.5INFRA · APIS
Windmill is building a full AI-native workflow platform — guest app access, agent evals, dbt runtime, and AI cost tracking shipped in rapid succession.
◆ Current state
Windmill is an open-source workflow automation and developer platform that has been adding AI capabilities at an accelerating rate. The last month brought AI agent evaluations (with dataset-based scoring and run comparison), AI usage and cost tracking per user and model, a Plan mode for AI sessions (read-only investigation posture), version history for both AI artifacts and resource values, and nested filter groups for Kafka and WebSocket triggers. The platform now spans workflow orchestration, AI-assisted script writing, and a native dbt runtime.
◆ Where it's heading
The pattern across recent releases is clear: Windmill is building the operational infrastructure around AI agents — not just the ability to run them, but the ability to measure, control, audit, and govern them. Agent evals add a testing layer; Plan mode adds a safety posture; cost tracking adds financial visibility; version history adds rollback capability. The guest app access model also introduces a new monetization dimension (4:1 guest-to-seat ratio above 100 free guests). Windmill is positioning as the AI workflow platform for teams that need enterprise-grade controls.
◆ Prediction
The eval framework (currently beta) will likely gain deeper integration with CI/CD and deployment flows. Guest access metering signals that Windmill is building toward consumption-based pricing for external-facing AI apps. Expect tighter integration between the agent evals system and the existing flow editor deployment pipeline.
Alternatives to Ably and Windmill
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 Ably or Windmill.
Jackett
Jackett ships daily tracker maintenance with no architectural moves on the horizon.
PocketBase
PocketBase ships bug cleanup wave after Go 1.27/json/v2 migration
Authelia
Authelia ships rapid-fire OIDC and storage fixes, staying firmly in 4.39.x hardening mode.
Cloudflare Tunnel
Cloudflare Tunnel ships version bumps monthly with no public release notes — direction is opaque.
Redocly
Redocly Reunite ships hardened AI search access controls and several days of steady bug fixes.
See all Ably alternatives → · See all Windmill alternatives →
Recent activity from Ably and Windmill
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoAblyJava SDK v1.8.1: LiveObjects Stable Release ⚡
- 5d agoAblyAbly Terraform Provider v1.1.0
- 8d agoWindmillGuest access for apps ⚡
- 10d agoAblyCocoa SDK v1.4.0: LiveObjects stable release
- 20d agoAblyAbly-js v2.28.0: end to end encryption for annotation data payloads
- 20d agoAblyAI Transport JS SDK v0.8.0: Temporal plugin and Vercel AI SDK v7 support
- 20d agoWindmillAI agent evals (beta) ⚡
- 20d agoWindmillAI usage and cost tracking
- 23d agoAblyCapability semantics changes for `xxx:*` wildcard resources
- 23d agoWindmillApplication default credentials for GCP Pub/Sub triggers
- 1mo agoWindmillPlan mode for AI sessions
- 1mo agoWindmillNested filter groups and dotted paths in trigger filters
Frequently asked questions
What is the difference between Ably and Windmill?
They serve adjacent needs but don't currently overlap on shipped themes. Windmill is currently shipping more aggressively (velocity 7.5 vs 6.3), with 2 editorial sparks in the last 30 days against 1. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Ably better than Windmill?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Windmill is currently shipping more aggressively (velocity 7.5 vs 6.3), with 2 editorial sparks in the last 30 days against 1. For your specific use case, the alternatives sections above list other Infra & APIs products to evaluate alongside.
What are the best alternatives to Ably?
Top Ably alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Ably alternatives" section above for the current picks, or visit /alternatives/ably for the full list with editorial commentary on each.
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.