Email infrastructure developers actually enjoy using.
Whether you're sending one OTP or a billion notifications, Keplars gives you everything needed to build, send, monitor, and scale email, from a single developer-first platform.
Trusted by Developers
Build once. Scale forever.
Integrate in minutes.
No complicated setup. No unnecessary configuration. Choose the integration that fits your stack.
REST API
Simple REST endpoints for transactional and marketing emails.
- JSON requests
- Secure API keys
- Dynamic templates
- Attachments
- Scheduled emails
- Batch sending
SMTP Relay
Already on SMTP? Point your app at Keplars, no workflow changes.
- WordPress
- Laravel
- Django
- Rails
- Legacy apps
OAuth Email Sending
The fastest way to send during development, no passwords, no DNS.
- Connect Gmail or Outlook
- No SMTP passwords
- No custom domains
- Migrate to your domain later
SDKs built for modern development.
One consistent API. One authentication model. One documentation experience.
Works with the tools you already use.
Instead of forcing new workflows, Keplars integrates into your existing stack.
Frameworks
Databases & Backend
Automation
CMS
Design & Templates
Cloud Platforms
Powerful APIs for every workflow.
Everything is accessible through APIs.
Email API
Send emails instantly.
Templates API
Create, update, version, preview.
Contacts API
Manage subscribers, lists, segments, attributes.
Domains API
Verify domains. Manage SPF, DKIM, DMARC.
Analytics API
Delivery, open, click, bounce, complaint.
Webhooks
Real-time events for delivered, opened, clicked, bounced, complaints, failures, unsubscribes.
Built for production.
Shipping email is easy. Running email infrastructure isn't. Keplars helps you do both.
SPF, DKIM, DMARC
Dedicated infrastructure, domain reputation, bounce handling, retry logic
REST API, SMTP, webhooks, status monitoring, retry queue
OAuth, encrypted credentials, secure API keys, HTTPS, role-based access
Build emails your way.
Some developers love code. Others prefer visual builders. Keplars supports both.
Observe every email.
Debugging email shouldn't require searching logs for hours. Know exactly what happened.
Built to scale.
Keplars grows with your application. No migration. No rebuilding. No vendor lock-in.
Why developers choose Keplars
| Others | Keplars |
|---|---|
| Transactional only | Transactional + Marketing |
| Separate template builder | Built-in visual editor |
| Separate marketing platform | One unified platform |
| SMTP only | SMTP + REST + OAuth |
| Few SDKs | Official SDKs for 11 languages |
| Manual workflows | APIs for everything |
| Limited integrations | Works with modern developer tools |
| Complicated onboarding | Start in minutes |
Everything developers need.
Build your product. We'll handle the emails.
Whether you're building a startup, SaaS platform, AI product, marketplace, or enterprise application, Keplars gives developers the infrastructure to send emails with confidence.
