Keplars is an email infrastructure platform that gets you sending transactional and marketing emails in under 5 clicks, with REST APIs, SMTP, OAuth connections, and a drag-and-drop editor. It unifies OAuth-based sending, custom domains, marketing campaigns, and email automation in one hosted tool.
What is Keplars?
Keplars is a cloud-based email delivery service that combines OAuth emails, transactional emails, marketing campaigns, automated workflows, and mailbox warmup in a single platform. You provide email content, recipient lists, or API triggers; Keplars delivers messages via Gmail, Outlook, Workspace, or your own verified domain, and returns real-time delivery, open, click, and bounce data for each email. The service is built by the Keplars team and requires no SMTP relay or DNS configuration when using the OAuth connection.
Key Features
- OAuth Emails — Connect an existing Google Workspace or Microsoft 365 account via secure OAuth; send immediately without SMTP relay or DNS setup, and manage multiple accounts from one dashboard.
- Custom Domains — Add your own verified domain with automatic SPF, DKIM, and DMARC configuration, and switch providers at any time without code changes.
- Unified Email Editor — One editor that combines drag-and-drop blocks with raw HTML/MJML code, letting you import designs from Canva or Figma and build pixel-perfect templates.
- Sandbox Mode — Test emails safely without consuming real usage.
- Real-Time Delivery Tracking — Follow each email from queued to delivered to opened, with timestamps and status updates in the dashboard.
- Email Warmup — Automatically ramp up sender reputation for new domains or connected accounts.
- Native Integrations — 100+ integrations including Firebase, Vercel, Supabase, PocketBase, Bubble, Payload CMS, Dodo Payments, n8n, Zapier, and template engines like React Email, MJML, Handlebars, EJS, and Pug.
- Marketing Campaigns — Build audiences, segment them, schedule campaigns, and track opens/clicks with webhook notifications and unsubscribe management.
- Email Scheduling — Schedule transactional or marketing emails individually or in bulk for a specific send time.
Who is it for?
- Developers — Add transactional email to apps using REST APIs, SMTP, or SDKs for Node.js, Python, Go, PHP, Ruby, Rust, Kotlin, Dart, C++, Swift, and Elixir, with sub-second delivery.
- Product teams — Run newsletters, product announcements, and re-engagement campaigns from the same platform used for transactional email, with no contact limits.
- Startups using Gmail or Outlook — Increase sending volume through OAuth while keeping your existing sender reputation and no DNS changes.
- Marketers — Use the drag-and-drop editor, audience segmentation, and campaign scheduling to send and analyze marketing emails without code.
What can you do with Keplars?
- Authenticated sender: Connect your Gmail or Microsoft 365 account and send immediately; switch to a custom domain later without code changes.
- Transactional API: POST to the instant-send endpoint (e.g.,
POST /api/v1/send-email/instant) and get delivery confirmation, opens, and clicks in real time.
- Marketing broadcasts: Design a template in the unified editor, segment your audience, schedule the send, and monitor engagement.
- Automation triggers: Fire emails from Firebase auth events, Vercel edge functions, Supabase database events, or Zapier workflows.
- Warmup campaigns: Automatically build inbox reputation for a new domain or account so your deliverability starts strong.
How does Keplars work?
- Sign up for a 7-day free trial—no credit card required.
- Choose a sending layer: connect Gmail/Outlook via OAuth or verify a custom domain.
- Create templates in the unified editor or import from your existing provider.
- Send through the dashboard, REST API, SMTP relay, or webhooks and watch delivery in real time.
Pricing
Keplars uses a fully dynamic pricing model based on email volume, not contacts. The price calculator shows exact costs for your sending volume. The Pulse plan costs $1 per month for 5,000 emails, billed monthly, and includes a 7-day free trial with no credit card required. All plans include 24/7 expert support and no contact limits.
FAQ
Is Keplars free?
Keplars offers a 7-day free trial with no credit card required. After the trial, the Pulse plan starts at $1 per month for 5,000 emails. There is no permanent free tier.
Can I send emails using my Gmail account?
Yes. Keplars has secure OAuth integration for Gmail and Microsoft 365, so you can send through your existing inbox without configuring SMTP or DNS records.
What is Keplars' deliverability rate?
Keplars reports a 99.77% inbox deliverability rate globally and under 5 seconds average time to inbox. It also offers a 99.99% uptime SLA with multi-region failover.
Does Keplars support custom domains?
Yes. You can add your own verified domain with automatic SPF, DKIM, and DMARC configuration, and you can switch between Gmail, Outlook, Workspace, or your custom domain at any time.
How many integrations does Keplars have?
The site lists 100+ native integrations, including Firebase, Supabase, Vercel, Zapier, n8n, Bubble, Payload CMS, Dodo Payments, and template engines like React Email, MJML, Handlebars, EJS, and Pug.
Visit Keplars for more details and the documentation for API reference and integration guides.
