Prodigy
6.7#2 in active learning tools$390 one-timeWebAPILinuxmacOS
VisitNo prices published.
Prodigy suits developers building machine-learning data workflows, especially those who need local or air-gapped operation. Annotation tasks can be completed in the web app without programming, but the tool assumes basic Python and command-line familiarity.
You want what its maker publishes above — check its page for the details.