Start without wasting budget. These products advertise a free tier, public calculator, free credits or trial route, but always check export limits, usage caps and commercial terms before serious work.
One of the quickest ways to move from a broad question to a source trail, provided the buyer still opens and checks the cited material.
Sometimes, but not always. Check the product terms, model policy, export watermark, licence restrictions and whether uploaded customer data is retained or used for training.
Upgrade only when the free tier proves repeatable value on real work. Track limits, output quality, correction time, exports, team controls and privacy requirements.