Keplars
Keplars is a developer-first transactional email API that lets you send emails in under 5 clicks via Gmail, Google Workspace, or Outlook — no SMTP or DNS setup required.
At a Glance
Perfect for testing and exploration
Engagement
Available On
Listed Apr 2026
About Keplars
Keplars Mail Service is a developer-first transactional email infrastructure platform that eliminates the complexity of SMTP configuration, DNS setup, and domain verification. It connects directly to Gmail, Google Workspace, or Microsoft Outlook via OAuth, enabling teams to start sending transactional emails in minutes. With a 99.77% deliverability rate and sub-5-second average time to inbox, Keplars handles the infrastructure so developers can focus on building their product.
- Hassle-Free OAuth Setup — Connect your Gmail, Google Workspace, or Microsoft Outlook account securely via OAuth; no SMTP configs, app passwords, or DNS records required to get started.
- RESTful Email API & SMTP Relay — Send transactional emails via clean REST APIs or SMTP relay with SDKs available for Node.js, Python, Go, PHP, Ruby, Rust, Kotlin, Dart, C++, Swift, and Elixir.
- Email Scheduling — Schedule emails for any future date and time with timezone support, use saved templates with dynamic parameters, and cancel or modify scheduled emails before delivery.
- LaunchPad AI-Powered Template Builder — Drag-and-drop or AI-generate transactional email templates; edit HTML visually or in code, preview across devices, and reuse templates across projects.
- Delivery Analytics & Tracking — Track every email from delivery to engagement — see delivery status, open events, link clicks, and full delivery timelines in one dashboard.
- Custom Domain Support — Use your own domain with SPF, DKIM, and DMARC verification for full brand control, or start instantly with an OAuth-managed domain.
- Role-Based Access Control (RBAC) — Enterprise-grade security with bank-level encryption, scoped API tokens, and team-level permissions to keep email delivery safe and compliant.
- Webhooks — Receive real-time webhook events for delivery, bounces, opens, and clicks; all webhooks are verified using digital signatures.
- Multi-Framework Template Support — Integrates with MJML, Pug, React Email, Handlebars, and EJS for flexible template authoring in any stack.
- Integrations — Works with Firebase, Vercel, Supabase, Lovable, and more — slot Keplars into your existing workflow without changing how you build.
Community Discussions
Be the first to start a conversation about Keplars
Share your experience with Keplars, ask questions, or help others learn from your insights.
Pricing
Free
Perfect for testing and exploration
- 5,000 emails / month
- 150 emails per hour
- 1 email account
- Unlimited API/SMTP
- 1 webhook
Orbit
Perfect for growing teams
- 10,000 emails / month
- 500 emails per hour
- 5 email accounts
- Unlimited API/SMTP
- 5 webhooks
- 5 AI credits for template
- 2 team members
- 3 day data retention
- 1 custom domain
- Email scheduling
- Drag & Drop Email Template Builder
- RESTful API
- SMTP Relay
- Batch Sending
- Markdown Email
- Delivery Insights
- DKIM, SPF, DMARC Authentication
- Customer Support 24x7
Launch
Perfect for startups and MVPs
- 25,000 emails / month
- 3,500 emails per hour
- 10 email accounts
- Unlimited API/SMTP
- 10 webhooks
- 10 AI credits for template
- 5 team members
- 7 day data retention
- 5 custom domains
- Email scheduling
- Drag & Drop Email Template Builder
- RESTful API
- SMTP Relay
- Batch Sending
- Markdown Email
- Delivery Insights
- DKIM, SPF, DMARC Authentication
- Customer Support 24x7
Custom
Customizable plan starting from Launch; adjust sliders for emails, accounts, webhooks, team members, and domains
- Up to 150,000 emails / month (example)
- Up to 35 email accounts (example)
- Up to 50 webhooks (example)
- Up to 25 team members (example)
- Up to 20 custom domains (example)
- Unlimited API keys
- Unlimited SMTP credentials
- 7-day data retention
- Customer Support 24x7
Extra Email Account
Add additional email accounts flexibly as your team expands
- 1 additional email account
Extra AI Credits
Expand AI-powered email template generation capacity
- 1 additional AI credit for template generation
Capabilities
Key Features
- Transactional Email API
- SMTP Relay
- OAuth Email (Gmail, Google Workspace, Outlook)
- Email Scheduling
- AI-Powered Template Builder (LaunchPad)
- Drag-and-Drop Email Editor
- Custom Domain Support
- SPF, DKIM, DMARC Authentication
- Delivery Analytics & Tracking
- Webhooks
- Role-Based Access Control (RBAC)
- Multi-language SDKs
- Batch Sending
- Markdown Email Support
- Real-time Delivery Timeline
- Multi-region Routing
- 99.9% Uptime SLA