head to head
Ghost vs Substack
Self-hostable open source versus closed distribution network.
What matters for teams choosing a transactional API
Judged purely as an API. What the request contract guarantees on retry, how complete the webhook event coverage is, whether suppressions are readable and writable programmatically, and how much the message log retains when something needs debugging in production.
| Priority | Ghost | Substack |
|---|---|---|
| Idempotency keys | No | No |
| Webhooks | Yes | No |
| Event stream | No | No |
| Operating since | 2013 | 2017 |
| Suppressions API | Yes | Yes |
| Best published rate per 1,000 | Tiers not published in comparable form | Tiers not published in comparable form |
| Batch sending | Yes | Yes |
| SDKs | node | None |
| Deliverability | Depends on the SMTP provider configured (often Mailgun for Pro). | Reasonable for content-driven newsletters. |
For a transactional workload running high-frequency programmatic sends where a missed delivery is a product failure, Ghost takes every priority that separates them here (webhook coverage, operating track record, and SDK breadth), while Substack matches it on the rest. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | Ghost | Substack |
|---|---|---|
| Webhooks | Yes | No |
| SDKs | node | None |
| Deliverability | Depends on the SMTP provider configured (often Mailgun for Pro). | Reasonable for content-driven newsletters. |
| Tagline | Open-source publishing with built-in memberships and email. | Hosted newsletter platform with social network features. |
| Free tier | Self-hosted is free (your infra cost) | Free, 10% of paid subscriptions |
| Starts at | Ghost Pro from $9/mo | 10% revenue cut |
| Pricing model | self-hosted | subscriber-based |
| API | Yes | No |
| SMTP | Yes | No |
| Templates | rich | basic |
| React Email | No | No |
| Inbound | No | No |
| Multi-tenant | No | No |
| Idempotency | No | No |
| Dedicated IP | No | No |
| DX score | 7/10 | 2/10 |
| Best for | Independent publishers who want to own their content and stack. | Writers who prioritize distribution over flexibility. |
Ghost
pros
- ›Full ownership in self-hosted mode
- ›Memberships and Stripe integration
- ›Beautiful default themes
cons
- ›Requires another SMTP provider for sending at volume
- ›Heavier than Buttondown for plain newsletters
Substack
pros
- ›Distribution via the Substack network
- ›No platform fees beyond revenue cut
cons
- ›No API, no automation, no custom domain on free
- ›Lock-in to platform