CodexOS vs BookSirens
BookSirens connects you with 51,000+ verified reviewers who commit to reviewing on Amazon and Goodreads. It solves one problem well: finding readers. But if you already have an audience and need pen name management, review automation, and analytics across your catalog, you need a different tool.
Pricing and features verified April 2026
Pricing Comparison
| Starter | $19/mo | Unlimited pen names, ARC management |
| Pro | $29/mo | + analytics, review automation |
| Business | $49/mo | + team features, priority support |
| Per-ARC | $10/ARC + $2/reader | Pay per campaign, scales with readers |
| Author Plan | $100/yr | Unlimited ARCs, 2 pen names max |
| Publisher | Custom | Teams and publishers |
Feature-by-Feature Comparison
| Feature | CodexOS | BookSirens |
|---|---|---|
| ARC Management | Review reminders + tracking | Review aggregation |
| Pen Names | Unlimited (all plans) | 2 max (Author plan) |
| Reader Magnets / Lead Gen | Wishlist integration | Via reviewer pool |
| Review Automation | ✓ | Auto-reminders |
| Analytics | Series + genre analytics | Basic downloads |
| Group Promos | ✗ | ✓ |
| Email Integration | Free (all plans) | Limited |
| Audiobook Support | ✗ | ✗ |
| Book Formatting | ✗ | ✗ |
| Piracy Protection | Planned | Watermarking |
| Setup Complexity | Low | Low |
Key Numbers
The real difference: BookSirens charges $2 per reader on every ARC campaign. At 50 readers per book, that's $100+ per launch on top of the $10 campaign fee. CodexOS charges a flat $19/mo — send ARCs to your own audience with automated review reminders. No per-reader fees, no limits on campaigns.
Bottom line: Choose BookSirens if you're new and need to find reviewers. Choose CodexOS if you already have readers and need to organize ARC campaigns across multiple pen names with automated follow-up.
Ready to manage your pen names and ARCs?
Start with CodexOS at $19/mo. Unlimited pen names on every plan.
Try CodexOS Free