Side by side
Doppler vs Letter
Both stand on email marketing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
Doppler combines campaign creation, automation, segmentation, and testing in a web service. Compare its contact, volume, and credit plans against your audience and sending requirements.
Visit Doppler Free plan APIWeb
Letter combines SaaS-focused automation, segmentation, broadcasts, and transactional sending in one platform. Its free plan includes all features but sets clear contact and email limits.
Visit LetterThe facts
| Doppler | Letter | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | API, Web |
| Lowest paid plan | Contacts: $10 a month | Free or on request |
| Plans published | 4 | 1 |
| Maker | Not published | Not published |
| Website | fromdoppler.com | letter.app |
| On email marketing software | #40 of 187 | #44 of 187 |
Doppler: what it does well
- Email automation and audience segmentation
- Landing pages and A/B testing
- Free plan includes 500 contacts
- 39 native integrations
- Multiple billing approaches
What to know first
- Free plan lasts 90 days
- Free plan limits contacts to 500
- Paid pricing varies by plan basis
Letter: what it does well
- Visual editor supports branching and waits
- Forms include double opt-in and spam protection
- Unlimited events on the free plan
- REST API, SDKs, CLI, and webhooks
- Six listed native integrations
What to know first
- Free plan limited to 1,000 contacts
- Free plan capped at 5,000 emails monthly
- Free plan includes a Powered by Letter badge
Alternatives to Doppler Alternatives to Letter The whole list