Certificate lifecycle management · Rankedcert-manager
cert-manager is a free, open-source tool for managing certificate lifecycles in Kubernetes and OpenShift environments · cert-manager.io ↗
Read the same way at every company size.
The standing depends on who is buying. Every model is asked the same questions for each company size.
Sectigo Certificate Manager is first at 35%.
Sectigo Certificate Manager is first at 43%. 0 of 14 models made it the first choice when asked directly.
Keyfactor Command is first at 28%.
Why models recommend it
“Small/DevOps/Kubernetes shop with public TLS only: `cert-manager + Let's Encrypt` = $0 operating cost.”Muse Glimmer 30B · Budget-constrained question · first choice
“If you have Kubernetes: Start with cert-manager (free)”Kimi K2 · Budget-constrained question · first choice
“combining `cert-manager` (for K8s ingress/workloads) with HashiCorp Vault ... is the industry standard open-source approach”Gemini 3.5 Flash · Paraphrase question · alternative
“Budget-conscious / Kubernetes-heavy: Start with cert-manager on Kubernetes for automated ACME issuance and renewal”Muse Glimmer 30B · Paraphrase question · alternative
What gives them pause
“it is not, by itself, a complete inventory and lifecycle system for network appliances, endpoints, legacy servers, code signing, or certificates outside the cluster”Perplexity Sonar · Negative question · warning
“Does not manage certificates for VMs, network devices, or on-prem servers outside a cluster, and lacks a UI or management console”Claude Haiku 4.5 · Negative question · warning
“Ensure your cert-manager is updated and not using compromised root CAs”GLM 4.7 FlashX · Negative question · warning
Also on the shortlist
The products named in the same answers as cert-manager, over the 37 answers that named it, and how often each was the first choice instead.
| Product | Named together | Picked instead | |
|---|---|---|---|
| 22 | 5 | Compare → | |
| 21 | 1 | View → | |
| 19 | 2 | Compare → | |
| 17 | 2 | View → | |
| 16 | 2 | View → | |
| 15 | 2 | Compare → | |
| 15 | 0 | Compare → | |
| 13 | 0 | Compare → | |
| 12 | 4 | Compare → | |
| 10 | 1 | View → |
What the models named instead of cert-manager →
A side-by-side page exists where both products are among a category's top eight.
At a glance
Stated on cert-manager's own site, not checked by Gane.
- For
- Kubernetes and OpenShift workloads
How this is measured
Fourteen AI models from 12 labs are asked the same buying questions six ways, for three company sizes. Standings refresh every edition.
Gane sells AI visibility software. No company can pay to change a result.
Read the method →Sources returned with these answers
Fourteen of the fourteen models returned a source list in this edition: five return the pages they cited and nine the search results they consulted. These counts come from 32 of the 37 answers that named cert-manager and are not a share of its labels.
Domains cited
123 of the 123 domain citations in answers naming cert-manager came from a third party's page.
Pages cited
Pages are listed as the models cited them.
By model
| Model | First choice | Alternative | Mention | Warning | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 0 | 1 | 0 | 1 | 2 |
| GPT-5.4 mini | 0 | 0 | 0 | 0 | 0 |
| Gemini 3.5 Flash | 0 | 2 | 0 | 0 | 2 |
| Perplexity Sonar | 0 | 3 | 0 | 1 | 4 |
| Grok 4.20 | 0 | 1 | 0 | 0 | 1 |
| Mistral Small | 0 | 1 | 0 | 0 | 1 |
| DeepSeek V4 Flash | 0 | 0 | 0 | 0 | 0 |
| Llama 4 Maverick | 0 | 0 | 0 | 0 | 0 |
| Qwen 3.7 Flash | 0 | 0 | 0 | 0 | 0 |
| Kimi K2 | 1 | 0 | 0 | 0 | 1 |
| GLM 4.7 FlashX | 0 | 0 | 0 | 1 | 1 |
| MiniMax M2.5 | 0 | 0 | 1 | 0 | 1 |
| GPT-6 Luna | 0 | 1 | 0 | 0 | 1 |
| Muse Glimmer 30B | 1 | 1 | 0 | 0 | 2 |