Apache OpenWhisk
Apache OpenWhisk: A self-managed, event-driven platform with flexible runtimes and Kubernetes deployment. Ranked #13 of 32 in Serverless Hosting by our editors (8.2/10); pricing: Open source; best for teams building open-source event-driven serverless platforms.
At a glance
- Editor score8.2 / 10
- PricingOpen source
- Best forTeams building open-source event-driven serverless platforms
- Paid fromFree
- Execution modelRequest_based
- Facts checked19 Sep 2026
Where it wins
- Connects event feeds, triggers, and rules to serverless actions
- Supports synchronous and asynchronous invocation plus compositions
- Offers Docker runtimes, REST access, and Kubernetes deployment
Where it doesn't
- Requires a self-managed deployment rather than a vendor-hosted service
- Management centers on the wsk CLI and YAML deployment manifests
- No paid hosted tier is described for teams seeking managed service
Our verdict on Apache OpenWhisk
Apache OpenWhisk is an open-source platform for running functions in response to events or HTTP requests. It is aimed at teams that want to operate their own serverless environment, including developers building APIs, event-driven processing, scheduled jobs, or composed functions. Deployment options include local environments and Kubernetes, so it can fit teams that prefer to manage the platform rather than buy a vendor-hosted service.
Its event model is broader than a simple function endpoint: actions can be connected to triggers, rules, feeds, and sequences. Invocation can be synchronous or asynchronous, and web actions support HTTP handlers. REST access is available, while the wsk command-line tool and wskdeploy manifests provide management and application deployment paths. Docker-based runtimes allow custom execution environments; listed runtime languages include Go, Java, JavaScript/Node.js, .NET, PHP, Python, Ruby, Rust, Scala, and Swift. Integrations include Kafka, Cloudant, Slack, RSS, GitHub, and JIRA, making it relevant where event sources and existing services matter.
The key trade-off is operational responsibility: OpenWhisk is distributed as self-managed open-source software, not a vendor-hosted paid service. Kubernetes deployment support can suit teams already prepared to operate that environment, while teams looking for a managed service should consider hosted alternatives. The documentation describes a configurable action timeout range up to 300 seconds; that is a platform setting, not a paid-plan limit. Choose OpenWhisk when control over deployment and an event-driven programming model are priorities. It is a less natural fit for buyers who want a hosted product with a published plan and pricing structure.
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Apache OpenWhisk pricing
Apache OpenWhisk fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Execution model | Request_based |
| Max execution time | Not verified |
| Deployment methods | Cli |
| Runtime languages | Go, Java, JavaScript/Node.js, .NET, PHP, Python, Ruby, Rust, Scala, Swift, and custom Docker runtimes |
| Custom domains | Not verified |
| Preview deployments | Not verified |
| Deployment | Desktop, Self-hosted |
| Platforms | Linux, macOS, Windows |
| Integrations | 7 integrations: Kafka, Cloudant, Push Notifications, Slack, RSS, GitHub … |
| Pricing | Open source |
| Website | openwhisk.apache.org |
| Facts checked | 19 Sep 2026 |
Apache OpenWhisk integrations
Apache OpenWhisk lists 7 integrations on its own site.
- Kafka
- Cloudant
- Push Notifications
- Slack
- RSS
- GitHub
- JIRA
Alternatives to Apache OpenWhisk
- AWS LambdaA mature, broad serverless compute service with usage-based pricing and AWS integrations.9.4
- Google Cloud RunDeploy containers or source code, with automatic scaling that can reach zero.9.3
- Azure FunctionsA flexible Azure runtime for scheduled and event-driven functions, with several hosting models.9.2
See all Apache OpenWhisk alternatives →
Also Ranked In
Apache OpenWhisk is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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