Transactional and marketing email
Send both transactional messages and marketing campaigns from one platform instead of splitting tools for product notifications and subscriber email.
Keplars
Keplars is an email infrastructure platform for transactional and marketing email, aimed at product teams that want API- or SMTP-based sending with delivery visibility, sandbox testing, and usage-based pricing.
Overview
Keplars is an email infrastructure platform for product teams that need transactional and marketing sending in one place. The site positions it as a developer-focused service with full delivery visibility, sandbox testing, and usage-based pricing.
The product is designed for teams that want to connect quickly, send through REST API or SMTP, and monitor delivery events such as opens and clicks. Keplars also offers a pricing structure with monthly plans, a free trial, and custom usage options for higher-volume needs.
Core capabilities
Delivery visibility
Track delivery, opens, clicks, and email timelines so you can see what happened after send rather than relying only on logs.
API, SMTP, and webhook workflows
Use REST API, SMTP, or webhooks to connect Keplars to your product and observe message events programmatically.
Testing and template workflow
Test and iterate with sandbox testing, scheduling, and template tooling, including AI credits for template generation on paid plans.
Sender setup options
Set up sending with custom domains and built-in email account support, with the pricing page noting Google Workspace, Microsoft Outlook, or custom domain connection options.
Usage-based scaling
Scale through monthly plans and custom usage controls, with usage-based marketing pricing and plan tiers that adjust by volume.
Common use cases
Product and account notifications
Handle OTPs, password resets, alerts, invoices, and other product-triggered emails from a single infrastructure layer with delivery tracking.
Marketing campaigns
Run newsletters, announcements, and re-engagement campaigns from the dashboard while keeping campaign sending separate from transactional traffic.
Developer-led integration
Connect a product or internal tool through REST API or SMTP when a team wants simple sending without a large configuration burden.
Testing and scheduled rollout
Use sandbox testing and scheduled sends to validate email flow before going live or to prepare campaign timing in advance.
Growing teams and higher volume
Scale beyond a starter setup by moving through monthly tiers or custom limits as email volume, accounts, or domains grow.
Pros and Cons
Pros
- Supports both transactional and marketing email in one platform.
- Offers delivery visibility with opens, clicks, and email timelines.
- Provides REST API, SMTP, and webhook-based integration paths.
- Includes sandbox testing and scheduling on the pricing page.
- Publishes a clear pricing structure with monthly plans and usage-based marketing pricing.
Cons
- The site does not currently list SOC 2, HIPAA, or ISO certification for Keplars itself.
- The public pages provide limited detail on integrations beyond API, SMTP, webhooks, and connections to common mail accounts or custom domains.
- Some pricing and retention details depend on plan tier or custom configuration, so buyers need to check the pricing page closely.
FAQ
Is Keplars secure and reliable?
Keplars is hosted across Leaseweb data centers and Amazon Web Services (AWS), with redundancy, HTTPS/TLS encryption, secure credential handling, and controlled internal access. The company says it is not currently SOC 2, HIPAA, or ISO certified.
What kinds of emails can I send?
Keplars supports both transactional and marketing email. The FAQ and homepage mention OTPs, password resets, alerts, onboarding flows, product notifications, and subscriber campaigns.
How do I send emails with Keplars?
Keplars supports sending through REST API or SMTP, with webhooks for delivery, bounce, open, and click tracking. The pricing page also mentions sandbox testing, email scheduling, and custom domains.
How does Keplars pricing work?
Marketing email pricing is usage-based: you pay for emails sent rather than the size of your contact list. The pricing page also presents monthly plans with a free trial.
Can I use the same account for transactional and marketing email?
According to the pricing page, transactional and marketing traffic are separated so critical transactional messages are not mixed with campaign sending.
Quick Facts
- Category
- Email infrastructure
- Primary users
- Product teams, developers, and operators
- Email types
- Transactional and marketing
- Integration options
- REST API, SMTP, webhooks, custom domains
- Pricing model
- Monthly plans with usage-based marketing pricing and a free trial
- Source domain
- keplars.com
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