An AI book-writing studio that outlines, drafts, edits, illustrates and formats a book for publishing.
The catch: Tier 1 is 500 credits a month, and the terms say access to future AI models may come at a discount or need an add-on. Audiobooks, translation and BYOK are top-tier only ($519).
Writing & ContentAppSumo4.7/5 on AppSumo (235 reviews)
A booking page and scheduler for one-on-one, group and paid meetings, built as a cheaper Calendly alternative.
The catch: Paid bookings carry a 1% platform fee, the booking page shows a "Powered by TidyCal" bar, and team members (you + 3) need the $79 Agency plan. Existing paid TidyCal accounts can't buy it.
Checks email lists for invalid, disposable and risky addresses before you send, in bulk or over an API.
The catch: Usage is metered as 500 verification credits a day on one code (4,500 a day at five codes) plus a one-time bonus of 100K credits, so a single huge list can take days unless you stack codes.
Email MarketingAppSumo4.9/5 on AppSumo (758 reviews)
Simple email marketing for creators: campaigns, automations, forms and landing pages.
The catch: The $29 license is capped at 5,000 contacts and 300,000 lifetime email sends, not per month. Removing SendFox branding costs $10 a month (Empire add-on).
Email MarketingAppSumo4.0/5 on AppSumo (342 reviews)