Flagger vs Plural
Flagger
flagger.appPlural
plural.shSide by side
| Figure | Flagger | Plural |
|---|---|---|
| Price from | Free | $450/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | Yes |
| Web | — | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 3 |
| Spec score · Progressive Delivery Software | 8.2 (#11) | 8.7 (#5) |
| Spec score · Kubernetes Deployment Tools | 8.1 (#11) | 8.8 (#5) |
| License | Flagger is licensed under Apache 2.0. | Compiled Plural platform versions from Plural Labs are licensed under MIT; source-code use may be AGPLv3, commercial, or app.plural.sh licensed, while admin tools and configuration files use Apache 2.0. |
| Product | Flagger is a progressive delivery Kubernetes operator that automates application releases on Kubernetes. | Plural describes itself as AI for infrastructure that can upgrade clusters, resolve incidents, patch vulnerabilities, optimize cost, and execute changes across code, clusters, and cloud. |
| Support | The project directs users to its documentation, the CNCF community Slack #flagger channel, Flux talks, and GitHub issues for help. | Pro includes email support with a one-business-day response SLA, while Enterprise includes dedicated Slack or Teams communication and a one-hour guaranteed response SLA. |
Plans
In their own words
Flagger
Flagger is a self-hosted Kubernetes operator that automates progressive delivery for applications running on Kubernetes. It gradually shifts traffic to a new version while checking measures such as HTTP or gRPC request success and latency. Deployment approaches include canary releases, A/B testing, and blue/green deployments, routed through an ingress controller or a service mesh compatible with the Kubernetes Gateway API. Built-in checks cover HTTP request success rate and duration; teams can add custom metrics and webhooks for acceptance tests, load tests, or other validation. Release analysis can query systems including Prometheus, Datadog, CloudWatch, New Relic, Graphite, Dynatrace, InfluxDB, and Google Cloud Monitoring. If SLO analysis detects a performance drop, Flagger rolls back the release automatically. Manual controls allow approval, pausing, or resuming deployments, and notifications can go to Slack, Microsoft Teams, Discord, or Rocket. It is configured through Kubernetes custom resources, works with Kubernetes-compatible CI/CD solutions, and can be used with Flux for GitOps canary pipelines. Flagger is Apache 2.0 licensed and free.
Plural
Plural is an AI tool for infrastructure work, presented for platform and DevOps teams. It can upgrade clusters, resolve incidents, patch vulnerabilities, optimize costs, and execute changes across code, clusters, and cloud. Its project-scoped Workbenches package an AI agent’s prompt, capabilities, tools, and automation triggers for infrastructure operations. Plural says agents can draw on a live semantic graph covering clusters, stacks, services, and changes across an estate. Integrations include Prometheus, Datadog, Loki, Elastic, Tempo, Jaeger, GitHub, GitLab, Bitbucket, Slack, Microsoft Teams, Jira, and Linear. Cloud tools provide SQL-queryable access to AWS, GCP, and Azure data, including billing and infrastructure services. Changes are submitted as pull requests in existing repositories for human review. Plural says actions are logged, permissions are bounded, tool calls and decisions can be inspected, and changes can be reviewed before confirmation. Sandbox is free for a 14-day platform trial. Pro starts at $450/mo for one cluster, with each additional cluster at $250/mo, and includes a 30-day free trial. Pro uses shared Plural infrastructure; Enterprise offers shared, dedicated, or on-prem hosting.