Pricing
Pay as you go — no subscription. Add prepaid usage credit and spend it only on what you create. Credit never expires and is used only for PenMyBook. All prices are in US dollars; any sales tax or VAT is added at checkout by Paddle, our Merchant of Record.
Add credit
Credit packs: $10 · $25 · $50 · $100 · $250 · $500, or any whole-dollar amount from $10. Unspent credit you paid for can be refunded — see the Refund Policy.
Free every week
1 chapter and 1 cover free each week (resets Sunday 00:00 UTC). Planning your book with the assistant, research, and the diagrams and figures inside your chapters are always included.
Writing
| Technical & non-fiction | $0.85 per subtopic | Charged per chapter, just before it is written |
| Science fiction | $1.50 per subtopic | Charged per chapter, just before it is written |
| Literary fiction | $1.50 per subtopic | Charged per chapter, just before it is written |
| Screenplay | $1.50 per subtopic | Charged per chapter, just before it is written |
| Children's | $1.50 per subtopic | Charged per chapter, just before it is written |
A subtopic is one section of a chapter in your approved plan, so you see the cost of every chapter before generation starts. Example: a 10-chapter technical book with 4 subtopics per chapter costs 40 × $0.85 + $0.40 cover = $34.40.
Covers, images and edits
| Book cover | $0.40 | Once per book |
| Text edit with the AI editor | $0.08 per change | Quoted before you confirm; deleting and renaming are free |
| Image edit | $0.10 | Free preview, charged when you keep it |
| Cover artwork edit | $0.10 | Quoted before you confirm |
| AI illustration for a diagram | $0.40 | Offered only if a diagram cannot be drawn; refunded if it fails |
Exports
| Digital PDF | Free | Download any time |
| Paperback (print-ready interior) | $10 | Once per book — re-exports are free |
| Kindle | $10 | Once per book — re-exports are free |
| EPUB | $10 | Once per book — re-exports are free |
Versions
A new version of a finished book is free. A version made from another version costs $5.
Teams
A team shares one credit balance that its owner and admins can top up. Custom pricing for larger teams is available by agreement — contact us.