CodeCharter pays off most clearly in three distinct situations.
Teams of three or more developers with shared code ownership
As soon as two or three devs work together, every PR becomes a negotiation: Was that the naming convention or not? Are controllers allowed to access EF directly? What was the architecture decision again?
That is exactly what CodeCharter is for. The rules live in a file, belong to the repo, and are enforced at build time. Discussions in PRs shift from "is this right?" to "do we want to change the rule?".
.NET teams that want to enforce architecture
Layering, coupling, dependency directions. CodeCharter verifies these properties continuously.
@name "Domain layer must not reference Web layer"
@severity error
@category "Architecture"
from t in Types
where t.Namespace.StartsWith("Acme.Domain")
where t.UsedTypes.Any(u => u.Namespace.StartsWith("Acme.Web"))
select t
Open-source maintainers with contributors
With pull requests from external contributors, enforcing consistency is time-consuming. Instead of manually explaining to every contributor that async methods need a suffix in your project, you let the CI handle it in a few seconds.
If you are not sure
Start the 7-day trial. A week is enough to see, against your real codebase, whether the tool is a fit — at no cost beyond an email address.