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Keplars vs Postmark
A practical comparison for product teams. Have a side-by-side look at setup effort, pricing flexibility, deliverability model, and developer experience when sending transactional and product emails.
Why teams move from Postmark to Keplars?
Great DX. Zero Setup Pain.
Keplars is built for developers who want to move quickly without setup friction. Connect via OAuth, API, SMTP, or webhooks and start sending in minutes, with clean defaults, clear logs, and predictable behavior that feels natural in real production workflows.Built to stay out of spam
Keplars is designed for product emails that must reach the inbox. By separating transactional traffic from marketing flows and enforcing clean sending behavior, Keplars achieves 99.99% inbox placement with an average spam rate of ~0.01%.Pricing that adapts as you grow
Instead of forcing teams into rigid tiers, Keplars uses dynamic, component-based pricing. You pay for what you actually use, whether that's more emails, domains, webhooks, or team members.
| Feature | Keplars | Postmark |
|---|---|---|
| Setup Time | Minutes (OAuth or custom domain) | Hours to days |
| UX | Simple, developer-first | Code-first, configuration-heavy |
| Minimum Data Retention | Configurable | Limited |
| Volume-based Pricing | No fixed tiers | Yes |
| Combined Pricing | Fully dynamic (emails, domains, team, webhooks) | No |
| Free Plan | 5,000 emails/mo free | 100 emails/mo free |
| Paid Plan Starts At | $5 / mo | $15 / mo |
Transactional Email Features
| Feature | Keplars | Postmark |
|---|---|---|
| Monthly Email Limits | Higher limits at lower tiers | Lower limits |
| AI-generated Email Templates | Yes | No |
| RESTful Email API | Yes | Yes |
| HTML Email Support | Yes | Yes |
| No-code Email Builder | Yes | No |
| Dynamic Suppression Handling | Yes | Limited |
| Event Webhooks | Yes | Yes |
Infrastructure & Deliverability
| Feature | Keplars | Postmark |
|---|---|---|
| OAuth Emails (Gmail / Workspace / Outlook) | Yes | No |
| Custom Domain (SPF / DKIM / DMARC) | Yes | Yes |
| Hourly / Rate Controls | Built-in | Limited |
| Inbox Placement Focus | Product-only traffic | ⚠ Mixed usage |
| Spam Rate | Extremely low by design | Depends on account usage |
| Delivery Logs & Visibility | 100% Visibility | No clear visibility |
Stop paying for email capacity you don't use
Disclaimer: Comparisons are provided for informational purposes only and are based on publicly available data at the time of publication.