Side by side
EmailEngine vs ZeptoMail
Both stand on email apis. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial APILinuxMac+3
Choose EmailEngine if you need a self-hosted API for existing Gmail, Microsoft 365 or IMAP mailboxes and want control over where it runs. Look elsewhere if you require POP3, ActiveSync, Exchange Web Services, a sent-mail archive or webhook delivery history. Its annual subscription is $1,450 a year, excluding VAT where applicable.
Visit EmailEngine
Free trial APIWeb
ZeptoMail focuses narrowly on transactional delivery, with event visibility, integrations, and security controls. Confirm the six-month credit expiry and campaign restrictions fit your sending model.
Visit ZeptoMailThe facts
| EmailEngine | ZeptoMail | |
|---|---|---|
| Free plan | A free trial | A free trial |
| Open source | Not published | Not published |
| Runs on | API, Linux, Mac, Self-hosted, Web, Windows | API, Web |
| Lowest paid plan | Annual subscription: $1,450 a year | Free or on request |
| Plans published | 2 | 2 |
| Maker | Not published | Not published |
| Website | emailengine.app | zoho.com |
| On email apis | #23 of 31 | #27 of 31 |
EmailEngine: what it does well
- Connects Gmail, Microsoft 365 and IMAP through one REST API.
- Sends webhooks for message and mailbox-state changes.
- Supports managed OAuth2 and provider-specific authentication options.
- Includes sync-status and queue inspection in its admin interface.
- Can encrypt stored credentials and tokens with AES-256-GCM.
What to know first
- Requires a server and Redis configured with the noeviction policy.
- Does not support POP3, ActiveSync or Exchange Web Services.
- Does not keep a sent-mail archive or webhook delivery history.
- Does not include SOC 2 or ISO 27001 certification.
ZeptoMail: what it does well
- SMTP relay and email API
- Delivery logs and event webhooks
- Transactional-email focus
- Security and compliance features listed
- First 10,000-email credit is free
What to know first
- No free plan
- Credits expire after six months
- Promotional and bulk email excluded
- Each recipient counts as one email
Alternatives to EmailEngine Alternatives to ZeptoMail The whole list