The ConvertKit alternative built for developers, not just creators
ConvertKit is great for creators who want a simple newsletter tool, but it's not built for developers. No transactional email, no SMTP relay, no real API-first approach. Sendkit gives you everything — transactional, campaigns, automations, and a full developer toolkit.
Why teams switch from ConvertKit
Built for creators, not developers
ConvertKit is designed for bloggers, YouTubers, and creators. It's not API-first and has limited developer tooling. Sendkit is built for developers with SDKs for 10+ languages, SMTP relay, and webhooks.
No transactional email
ConvertKit doesn't support transactional email. Password resets, order confirmations, and receipts require a separate service. Sendkit includes transactional email with full API and SMTP support on every plan.
No SMTP relay
ConvertKit has no SMTP relay — you can't send email from your own app via SMTP. Sendkit provides SMTP relay so you can integrate email sending into any application or framework.
No MCP server
ConvertKit has no MCP server for AI agents. Sendkit has a full MCP server with 40+ tools — your AI agent can manage templates, send campaigns, segment contacts, and track metrics.
Sendkit vs ConvertKit
| Feature | Sendkit | ConvertKit |
|---|---|---|
| Transactional email | Included (all plans) | Not available |
| SMTP Relay | Included | Not available |
| API-first design | Full REST API | Limited API |
| Official SDKs | 10 languages | No official SDKs |
| Free tier | 3,000 emails/mo (permanent) | 1,000 subscribers (limited features) |
| MCP Server | 40+ tools | Not available |
| Email Validation | Built-in | Not available |
| Unlimited Contacts | All plans | Priced per subscriber |
Pricing comparison
ConvertKit charges by subscriber count, and doesn't include transactional email at any price. Sendkit charges per email sent with unlimited contacts and includes everything.
| Volume | Sendkit | ConvertKit |
|---|---|---|
| 1,000 subscribers | $30/mo (Marketing, unlimited contacts) | Free (limited) or $29/mo (Creator) |
| 5,000 subscribers | $30/mo (Marketing, unlimited contacts) | $79/mo (Creator) |
| 10,000 subscribers | $30/mo (Marketing, unlimited contacts) | $119/mo (Creator) |
Sendkit is a good fit if you
- Need transactional and marketing email in one platform
- Want a developer-first API with SDKs and SMTP relay
- Need per-email pricing instead of per-subscriber
- Use AI agents and need MCP integration
- Want email validation built in
ConvertKit might be better if you
- Are a creator who wants a simple newsletter without code
- Need built-in landing pages and sign-up forms
- Want a visual email editor designed for non-technical users
- Need to sell digital products and paid subscriptions directly
Start sending in minutes.
3,000 emails/month on the free tier. No credit card, no commitment.