First Book AI vs Subject Line Generator

Comparing the features of First Book AI to Subject Line Generator

Feature
First Book AI
Subject Line Generator

Capability Features

AI Book Agent
Book Credits Additive
Book Structure
8 chapters, 24–32 sections
Content Ownership
Edit Content
Email Subject Line Generator
Full-Length Book Generation
Guided Book Creation
Include Emoji Option
Instant Generation
Max Subject Lines Per Generation
10
No Training on User Data
Priority Support Team
Publish on Amazon KDP
Quick Access
Roadmap Features
Additional languagesIn-text references & citationsReal-time collaborationAdvanced analytics
Section Editing
Setup Call Included
Step-by-step Guidance
Step-by-Step Questionnaire
Support Response Time Team
Within one business day
Team Use
Tone Adjustment
FormalInformalHumorousSeriousOptimisticMotivatingRespectfulAssertiveConversational

Integration Features

EPUB/MOBI Workflow
Export Format
Microsoft Word (.docx)Google DocsPDF (print-ready)
Export to DOCX
Export to PDF
Google Docs Export

Limitation Features

Current Languages
English only (as of now)
Manuscript Length Target
≈30k–35k words
No API Access
No API Access Mentioned
No File Format Support
No Platform Integrations Mentioned
No Plugin Support
Plagiarism Responsibility
User responsibility
Requires Email Address
Requires Email Body Input

Pricing Features

1 Book Plan
$19 one-time
10 Books Plan
$129 one-time
3 Books Plan
$47 one-time
30-Day Money Back Guarantee
50 Books Plan
$449 one-time
Book Credit Bundles
1 Book – $193 Books – $4710 Books – $12950 Books – $449
Free Tier
No Monthly Fees
No Subscription
One Time Payment
Refund Policy Duration
14-day money-back guarantee