GravityKit
GravityKit ships weekly across a whole plugin suite, with an MCP server now part of the lineup.
Comparison · Infra & APIs
Gatekeeper vs Prowler
A side-by-side editorial comparison of Gatekeeper and Prowler — release velocity, themes, recent moves, and the top alternatives to consider.
Gatekeeper vs Prowler: at a glance
What is Gatekeeper?
Gatekeeper grew a package manager for policies — and a benchmark to prove they are not too slow.
3.22.0-rc.0 in February introduced two CLI subcommands that change how policies are handled rather than what they express: gator policy, a brew-inspired tool for discovering, installing, upgrading and uninstalling policies from the gatekeeper-library, and gator bench, which benchmarks Rego and CEL engines with latency percentiles, throughput, memory profiling and baseline comparison for CI regression detection. The same release enabled sync-vap-enforcement-scope by default and gave both CEL and Rego access to namespace context during admission and audit. Since then, 3.23.0-rc.1 added status resource routing for remote cluster mode, and 3.24.0-beta.0 made generated ValidatingAdmissionPolicy output deterministic to stop a reconcile loop.
What is Prowler?
Prowler is turning its scanner into an agent that acts — and putting it behind the subscription.
Prowler still ships an open-source multi-cloud security scanner, but the last six releases have been about Lighthouse AI, its in-product agent, and the MCP server that feeds it. Lighthouse went from read-only Q&A to executing scans and managing providers, and now carries page context and reaches every tool family the MCP server advertises. Alongside that, 5.34.0 redrew the product line: CLI, Local Server, Local Dashboard and Hub stay free, while Cloud, Private Cloud and Lighthouse carry a subscription note on nearly every new feature.
Gatekeeper vs Prowler: editorial side-by-side
Gatekeeper
2.5INFRA · APIS
Gatekeeper grew a package manager for policies — and a benchmark to prove they are not too slow.
◆ Current state
3.22.0-rc.0 in February introduced two CLI subcommands that change how policies are handled rather than what they express: gator policy, a brew-inspired tool for discovering, installing, upgrading and uninstalling policies from the gatekeeper-library, and gator bench, which benchmarks Rego and CEL engines with latency percentiles, throughput, memory profiling and baseline comparison for CI regression detection. The same release enabled sync-vap-enforcement-scope by default and gave both CEL and Rego access to namespace context during admission and audit. Since then, 3.23.0-rc.1 added status resource routing for remote cluster mode, and 3.24.0-beta.0 made generated ValidatingAdmissionPolicy output deterministic to stop a reconcile loop.
◆ Where it's heading
The centre of gravity is moving from the admission controller to the tooling around it. Policies are becoming artefacts you install from a library at a version, benchmark against a baseline in CI, and test before they reach a cluster — which is the lifecycle application code already has and policy generally has not. Underneath, the ValidatingAdmissionPolicy path keeps maturing as Gatekeeper hands more enforcement to the Kubernetes-native mechanism it now generates.
◆ Prediction
Remote cluster mode gained status routing but the entries describe only that piece, so how far multi-cluster enforcement extends is unclear from these notes. The releases in this window are all beta and release candidates, so a 3.24.0 stable is the near-term milestone.
Prowler
7.5INFRA · APIS
Prowler is turning its scanner into an agent that acts — and putting it behind the subscription.
◆ Current state
Prowler still ships an open-source multi-cloud security scanner, but the last six releases have been about Lighthouse AI, its in-product agent, and the MCP server that feeds it. Lighthouse went from read-only Q&A to executing scans and managing providers, and now carries page context and reaches every tool family the MCP server advertises. Alongside that, 5.34.0 redrew the product line: CLI, Local Server, Local Dashboard and Hub stay free, while Cloud, Private Cloud and Lighthouse carry a subscription note on nearly every new feature.
◆ Where it's heading
The direction is a control plane, not a scanner. Prowler MCP is becoming the real API surface — integrations, users and roles are now agent-manageable on both Cloud and the self-hosted server, with RBAC as the only guardrail. Enterprise consolidation plumbing is arriving at the same cadence as the AI work: multi-domain SAML, Compliance Watchlist and Cross-Provider Compliance all target the org juggling many tenants and frameworks. The patch releases in between are dominated by container CVE reduction and correctness fixes in M365 and Attack Paths.
◆ Prediction
The admin surfaces not yet wired to MCP are the obvious next additions — compliance framework selection and the watchlist itself, given every other section of the app has been connected in sequence over the last four releases.
Alternatives to Gatekeeper and Prowler
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 Gatekeeper or Prowler.
LibreSpeed
After a two-year redesign, LibreSpeed is adding tests instead of polishing pixels.
Nautobot
A security advisory cycle forced Nautobot to break its REST API on both supported branches at once.
GoCD
GoCD's changelog is one maintainer keeping a 2010s CI server running on current runtimes.
Incus
Incus settled its 7.0 LTS, then went straight back to a monthly feature cadence.
Firecracker
Firecracker's microVMs can now grow and shrink devices while running.
See all Gatekeeper alternatives → · See all Prowler alternatives →
Recent activity from Gatekeeper and Prowler
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoProwlerCompliance Watchlist and multi-domain SAML SSO
- 3d agoProwlerContainer CVE cleanup and an M365 false-FAIL fix
- 3d agoProwlerLighthouse AI gains page context and the full MCP toolbox ⚡
- 9d agoProwlerFinding Groups dispatch to Jira; Attack Paths query filtering
- 21d agoProwlerLighthouse AI can now act, not just answer ⚡
- 21d agoProwlerProduct family renamed; Cross-Provider Compliance arrives
- 24d agoGatekeeperDeterministic VAP generation stops a reconcile loop
- 1mo agoGatekeeperStatus routing for remote cluster mode; mutation ApplyTo operations
- 4mo agoGatekeeperCI and dependency updates only
- 5mo agoGatekeepergator policy and gator bench: policy as an installable, benchmarked artefact ⚡
Frequently asked questions
What is the difference between Gatekeeper and Prowler?
They serve adjacent needs but don't currently overlap on shipped themes. Prowler is currently shipping more aggressively (velocity 7.5 vs 2.5), with 2 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 Gatekeeper better than Prowler?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Prowler is currently shipping more aggressively (velocity 7.5 vs 2.5), with 2 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 Gatekeeper?
Top Gatekeeper alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Gatekeeper alternatives" section above for the current picks, or visit /alternatives/gatekeeper for the full list with editorial commentary on each.
What are the best alternatives to Prowler?
Top Prowler alternatives in Infra & APIs are ranked by recent ship velocity. Browse the "Prowler alternatives" section above for the current picks, or visit /alternatives/prowler for the full list with editorial commentary on each.