The README has a single section about Pro features, and it starts with "All pro features are convenience or advanced features".
That definitely looks like the non-pro version is meant to be a free-to-use product.
That definitely looks like the non-pro version is meant to be a free-to-use product.
OTOH the "free-tier" is what attracts your interest as bait, probably accounts for the number of app installs visible on the store too etc.