What is Flagger?
An open-source progressive delivery tool that automates safe application releases on Kubernetes by gradually shifting traffic to new versions while measuring performance metrics and running conformance tests. It integrates with service meshes, ingress controllers, and monitoring systems to enable automated canary analysis and promotion.
Flagger pricing
We don't have Flagger's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Flagger does
The capabilities that matter for gitops, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- Deployment model
- Self host
- Pull based sync
- -
- Helm chart support
- ✓
- Kustomize support
- ✓
- Sops vault secrets decryption
- -
- Canary blue green rollouts
- ✓
- Multi cluster sync
- ✓
- UI dashboard included
- -
- Drift detection healing
- -
- SSO SAML RBAC
- -
- Cncf graduated incubating
- ✓
- SOC2 type ii
- -
- Pricing model
- Open source
Platform & deployment
Independently observed- Self-hosted
Integrations (15)
Independently observed- Dynatrace•
- InfluxDB•
- Google Cloud Monitoring•
- Istio
- Linkerd
- Kuma
- Knative
- nginx
- contour
- gloo
- traefik
- skipper
- Apache APISIX
- Gateway API
- Slack
Security & compliance
Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality
Flagger FAQ
Common questions about Flagger, answered from independent, dated evidence.
What is Flagger?
Infrastructure automation tool for Kubernetes that manages staged application releases using canary deployments, A/B testing, or blue-green strategies. It progressively shifts traffic to new versions while monitoring system health and running conformance tests to minimize production risk. It is indexed under Gitops.
Source: https://flagger.app/
Is Flagger free to use?
Flagger is open source, so it can be self-hosted and used at no licence cost. It is released under the Apache-2.0 licence. Pricing changes often, so verify at source before relying on it.
Source: https://flagger.app/
Can Flagger be self-hosted?
Yes. Flagger can be deployed cloud / SaaS, hybrid, on-premise and self-hosted, so it does not have to run on the vendor's infrastructure.
Source: https://flagger.app/
What does Flagger integrate with?
We have confirmed 12 integrations for Flagger, including Istio, Linkerd, Kuma, Knative, nginx, contour, gloo and traefik, plus 4 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.
Source: https://flagger.app/
Is Flagger open source?
Yes. Flagger is published under the Apache-2.0 licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Flagger alternatives
Other gitops we track, ranked by the same independent score.
- AkuityA managed GitOps platform for deploying and promoting Kubernetes applications at scale with AI-powered automationhigh · 75%
- PipeCDA Git-based platform for unified deployment operations across multiple application types and cloud environmentslow · 35%
- FleetA GitOps platform for managing Kubernetes workloads across multiple clusters from Git repositorieslow · 28%
- DevtronA unified Kubernetes management and deployment platform combining automation, GitOps integration, and AI-powered operationslow · 46%
- KargoGitOps-based orchestration for multi-stage application deploymentslow · 29%
- Jenkins XA continuous integration and deployment platform for Kuberneteslow · 29%
Compare Flagger
Side by side against other gitops, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Flagger, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Capabilities | 75 | 0.08 | 6.2 | ✓ |
| Release cadence | 72 | 0.07 | 4.8 | ✓ |
| Security score | 88 | 0.05 | 4.7 | ✓ |
| Development activity | 33 | 0.12 | 3.9 | ✓ |
| Stars | 70 | 0.03 | 2.3 | ✓ |
| Integrations | 32 | 0.05 | 1.7 | ✓ |
| Dependent projects | 17 | 0.08 | 1.4 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Package downloads | 0 | 0.17 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 10 | mediumsource · 2026-08-26 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 67% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Pricing model: open_source · Deployment model: self_host · Kustomize support: Yes · Helm chart support: Yes · Multi cluster sync: Yes · Cncf graduated incubating: Yes | mediumsource · 2026-10-15 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 12 | mediumsource · 2026-10-15 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | Go | highsource · 2026-10-15 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | Apache-2.0 | highsource · 2026-10-15 · 95% |
Pricing
Release
Security
Is Flagger the right choice for you?
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