Free alternatives to SendGrid
3 services, checked weekly
Twilio SendGrid retired its free plans in May 2025; new accounts get a trial instead. These e-mail APIs still have a lasting free plan for sending transactional mail, such as sign-up and password-reset messages.
| Service | Category | API key | Formats | Free use |
|---|---|---|---|---|
| Brevo (Sendinblue) email API | Communication | – | JSON | The free plan allows 300 e-mails per day; paid plans remove that limit. |
| Resend | Communication | – | JSON | The free plan allows 3,000 e-mails per month (at most 100 per day) and up to 3 domains; paid plans offer more. |
| Mailtrap | Communication | – | JSON | Free plan with 4,000 sent e-mails per month (at most 150 per day, one domain) and a testing sandbox with 50 e-mails per month; paid plans for more. |