Send better emails. Build faster.
Owlat is open-source and self-hosted. Design emails visually, manage audiences, run campaigns with A/B testing, and send transactional emails via API — all from one platform.
curl -fsSL https://get.owlat.app | bash Everything you need
to ship email
From builder to inbox, every tool in one platform.
Block-Based Email Editor
17 drag-and-drop block types with inline text editing. Build with text, images, buttons, columns, tables, carousels, and more. Save blocks to your library, manage translations per language, and preview across devices in real time.
Audience Engine
Store contacts with custom properties, organize into topics with double opt-in, build dynamic segments with filters, import via CSV, and capture leads with embeddable forms.
Campaigns + A/B Testing
Schedule sends for optimal timing, test subject lines and content variants side by side, then track opens, clicks, and engagement as results come in.
Automations
Build trigger-based flows for onboarding, re-engagement, and lifecycle messaging. Add delays, conditions, and branching logic — no code required.
Transactional Delivery
Send password resets, order confirmations, and receipts via API. Reference templates by slug or ID, inject dynamic data variables, and fall back to the default language automatically.
Deliverability
Verify your sending domain with guided DNS setup for SPF, DKIM, and DMARC. Manage blocklists, automatically include one-click unsubscribe headers, and stream delivery events via webhooks for full visibility.
Built in the open,
owned by you
Owlat is open source software. Inspect every line, self-host on your terms, and contribute to the platform you rely on. Fork it, extend it, migrate away — you always own your email stack.
Ship with the SDK,
or stay in the dashboard
Send transactional emails, manage contacts, trigger automations, and track delivery with a single API call. Use the TypeScript SDK for type-safe integrations or hit the REST API directly from any language.
import { Owlat } from '@owlat/sdk-js'
const owlat = new Owlat('lm_live_...')
// Send a transactional email
await owlat.transactional.send({
email: 'mira@acme.io',
slug: 'welcome-email',
dataVariables: { firstName: 'Mira' }
})
// Create a contact and add to a list
const contact = await owlat.contacts.create({
email: 'mira@acme.io',
firstName: 'Mira'
})
await owlat.lists.addContact({
listId: 'list_abc123',
email: 'mira@acme.io'
})Free forever. Your infrastructure.
Open-source under Apache 2.0. Hosted cloud is coming later — self-host today and own your data.
Available today
Self-Host
Run on your own VPS. No limits. No billing.
Free forever
- All features — no gated tiers
- Unlimited sends
- Unlimited team members
- Unlimited contacts
- In-app updates (one-click)
- Apache 2.0 licensed
Coming soon
Hosted Cloud
We run it for you. Launch in Q3.
€— /mo
- Managed infrastructure
- Dedicated IPs & warmup
- Automatic updates & backups
Resource requirements
What your VPS needs to run Owlat.
| Minimum | Recommended | |
|---|---|---|
| RAM | 4 GB | 8 GB |
| Disk | 20 GB | 40 GB |
| CPU | 2 vCPU | 4 vCPU |
| Domain + DNS | Required | Required |
Start sending better emails today
Set up your first campaign in minutes. Every feature is included from the start — no feature gates, no plan upgrades.
Join Waiting ListNo long-term contracts. Cancel anytime.