Helo
Helo is an email API and SMTP service designed for developers who need to send transactional and broadcast emails with ease.
Our verdict
Who it's for
Send transactional and broadcast emails via a simple REST API
Who should look elsewhere
Relatively new service with a smaller community and ecosystem than established providers like SendGrid or Mailgun
Pros
- +Developer-friendly API with extensive SDK language support
- +Bootstrapped and independent, aligning incentives with user needs
- +Affordable pricing compared to many competitors
Cons
- −Relatively new service with a smaller community and ecosystem than established providers like SendGrid or Mailgun
- −Limited advanced features like A/B testing or sophisticated analytics compared to larger competitors
Key features
- ✓Transactional email sending (password resets, confirmations, notifications)
- ✓Broadcast email campaigns to large lists with a single API call
- ✓SDKs available for Ruby, JavaScript (TypeScript), C#, Go, and Python
- ✓Idempotency keys to prevent duplicate sends
- ✓Template-based email personalization with variable substitution
Pricing
| Plan | Price | Billing | Notes |
|---|---|---|---|
| Free | — | month | 1,000 free emails for testing |
| One Plan | $5 | month | Unlimited users; Detailed analytics; Unlimited domains |