MailingCore vs EmailJS
The same use case — sending emails from your frontend without a backend — with EU data residency, a panel with per-send logs, and room to grow into transactional and newsletter.
Quick comparison
| Capability | MailingCore | EmailJS |
|---|---|---|
| Frontend sending without a backend | Yes (tiny SDK) | Yes — its core |
| European company & EU data residency | Yes, GDPR-native | Not documented |
| Server-side transactional API | Yes, with idempotency | Frontend-oriented |
| Versioned templates (draft/published) | Yes | Templates without versioning |
| Newsletter, contacts & campaigns | Included | Not its focus |
| Own domain with verified SPF/DKIM/DMARC | Yes, DNS wizard | Depends on the provider you connect |
| Send logs with statuses & signed webhooks | Yes | Basic history |
| Spanish-language support | Yes | Not documented |
| AI agents (MCP, llms.txt) | Yes | No |
Comparison based on public information at the time of writing and our reading of each provider's documentation. Products change — always verify details on the provider's official site.
Choose MailingCore if…
- You need real GDPR: data hosted and processed in the EU, with a real right to erasure.
- You want to see every send in a panel: statuses, bounces, opens and clicks.
- Today's contact form will become tomorrow's transactional and newsletter — without switching tools.
- You prefer support and billing in Spanish and in euros.
EmailJS may fit you better if…
- You already use its ecosystem and just need a simple form that works.
- You want to connect your personal email provider directly from the client.
- You value its years of maturity and community size.
FAQ
Can I migrate from EmailJS?
Yes. The model is the same (browser SDK + templates), so migrating usually means swapping the snippet: initialise mailingcore-js with your API key and recreate the template by pasting your HTML with {{mustache}} variables.
Is it safe to expose the API key in the frontend?
Use a scoped API key (email:send): it can't read data or touch anything else. There's also per-IP rate limiting and plan quotas. For sensitive operations, use the server-side API.
Is MailingCore as mature as EmailJS?
No — EmailJS has years in the market and MailingCore is a young product. In exchange you get a full platform (transactional + newsletter), EU data residency and a fast-moving roadmap. We say this plainly in our FAQ.