Method and legend

Paid-feature tier

Describes what the self-run edition withholds. It is not a quality score and does not mean feature parity with the paid tool.

ANo paid feature gates in the self-run edition

Paid hosting or support may still exist.

BPaid extras for admin, identity or audit

Everyday use works without paying.

CDaily-workflow features need a paid edition

Capacity, collaboration or essential integrations are gated. The code can still be open.

SSource-available license, not OSI

Kept outside default open-source recommendations.

ULicense or parity scope unresolved

Kept outside default recommendations until resolved.

Fit

Judged per pair of products, never per project.

Drop-in

Everyday workflows carry over with little rebuilding.

Partial

Core overlap exists; named gaps need replacing or rebuilding.

Different approach

Solves the same job differently; plan a redesign, not a copy.

Unknown

Shown in italics as not established. It means unverified, not zero and not no. A dash in a price is unresolved, not free.