Email Infrastructure, Simplified forDevelopers
Build, send, and scale emails with a modern email editor, enterprise-grade deliverability, mailbox warmup, and real-time delivery insights.
Email Infrastructure Without the Complexity
Everything you need to build, send, test, track, and scale customer emails from one modern platform.
Gmail, Outlook & Custom Domains
Send emails using Gmail, Outlook, or your own verified domain with ease.
Real-time Delivery, Opens & Clicks
Track every delivery, open, click, bounce, and engagement as it happens.
Visual Builder, APIs & Automations
Design beautiful emails, integrate quickly, and automate customer journeys.
Sandbox Testing & Enterprise-grade Deliverability
Test safely before sending and maximize inbox placement with confidence.
Trusted by world-class developers & industry leading teams
Built for scale
Infrastructure that performs under enterprise load
The numbers product teams depend on, measured across every region we operate in.
99.99%
Uptime SLA, multi-region failover
100%
Delivery visibility, opens & clicks
<5s
Average time to inbox, globally
99.77%
Inbox deliverability rate, globally
<5 clicks
API & SMTP keys, webhooks, no config
4 Layers
Use Gmail, Workspace, Outlook, or your own domain.
Send from Gmail or Outlook in minutes
Connect an existing Google or Microsoft account through secure OAuth and start sending through Keplars immediately, using the sender reputation you have already established.
- Secure OAuth connection for Gmail & Microsoft 365
- No SMTP relay or DNS configuration required
- Manage multiple connected accounts from one place
- Switch providers at any time, without code changes
- Automatic DKIM, SPF & DMARC configuration
One platform for every email your product sends
One platform for every email use case, from transactional APIs to full marketing campaigns.
Real-Time Delivery Tracking
Monitor every email's journey from sent to opened. Get instant visibility into delivery status, bounces, and engagement metrics.
100+ Native Integrations
Plug Keplars into your existing stack in minutes. Connect to the CRMs, e-commerce platforms, and dev tools your team already uses.
Marketing Email Campaigns
Design, schedule, and send marketing emails to your audience at scale. Track opens, clicks, and conversions with rich analytics.
Transactional Emails, Done Right
Send password resets, order confirmations, and alerts via our REST API, SMTP relay, webhooks, and official SDKs with sub-second delivery every time.
Drop blocks here…
Unified Email Editor
One editor for drag-and-drop and raw code. Import Canva or Figma designs as email templates and ship pixel-perfect emails faster.
24/7 Expert Support
Real humans, any time. Every Keplars plan includes round-the-clock support so your email infrastructure never leaves you stranded.
Loved by Product Teams Worldwide
Real feedback from founders, engineers, and operators using Keplars every day for reliable email infrastructure.
Keplars made email much easier for us - other tools usually come with friction, but Keplars felt straightforward from day one. Deliverability has been strong, and the platform is built with strong security, so we're comfortable using it for critical user communication.
Hamza Zia
Founder & CEO at GitStart
