EarnDraft

Free book is 0 USD forever and covers one complete book project: brief, outline, 5 chapters of roughly 600 to 900 words, a cover, one chapter rewrite and one alternative cover. It is preview-only though, so exporting, publishing and a second book all require Pro at 29 USD a month, which carries 100 generation credits. Credits are spent one per chapter, rewrite or cover, while briefs, outlines, edits, exports and publishing cost none. Top-up packs are bought outright and never expire at 9 USD for 25 credits, 19 for 75 and 39 for 200, but they add credits only and do not unlock export. Polar is the merchant of record.