Overview
Keila and Postmark serve different needs in the email space. Keila is a open-source email newsletter tool with EU hosting. Postmark is a premium transactional email with best-in-class deliverability.
The choice depends on what you need: open source (agplv3) (Keila) or best deliverability (Postmark). For SaaS businesses specifically, Sequenzy offers purpose-built features that neither tool provides.
Pricing Comparison
- Keila: $8-32/month (cloud) - Open source (AGPLv3). Self-hosted free. EU cloud.
- Postmark: $15/month - Premium transactional. Best-in-class deliverability.
- Sequenzy: $49/month for 120,000 emails, unlimited subscribers, fully managed. See pricing.
Where Keila Wins
Open source (AGPLv3)
Keila offers open source (agplv3), which is a genuine advantage for teams that need it.
EU cloud hosting
Keila offers eu cloud hosting, which is a genuine advantage for teams that need it.
Visual editor + MJML
Keila offers visual editor + mjml, which is a genuine advantage for teams that need it.
Privacy-first
Keila offers privacy-first, which is a genuine advantage for teams that need it.
Where Postmark Wins
Best deliverability
Postmark offers best deliverability, which matters for teams that prioritize this.
Fast delivery
Postmark offers fast delivery, which matters for teams that prioritize this.
Message streams
Postmark offers message streams, which matters for teams that prioritize this.
Great support
Postmark offers great support, which matters for teams that prioritize this.
Why Sequenzy for SaaS
If you are building a SaaS product, Sequenzy offers what neither Keila nor Postmark provides: native Stripe integration for billing-based automation, AI sequences that generate onboarding and retention emails, and unified transactional + marketing email in one platform. Check our pricing page for details.
Open-Source vs Commercial Trade-off
Keila's AGPLv3 license gives you complete access to the source code, the ability to self-host on your infrastructure, and freedom from vendor lock-in. Postmark is proprietary software where you rent access to features that can change or increase in price at any time. For organizations that prioritize data sovereignty, code auditability, and long-term independence, Keila's open-source approach provides guarantees that commercial platforms cannot. For organizations that prioritize feature depth and convenience, Postmark's commercial approach delivers more capabilities with less operational overhead.
EU Data Sovereignty
Keila's EU cloud hosting addresses a growing concern among European organizations: where their data lives and who can access it. Self-hosted Keila keeps all subscriber data on your own infrastructure under your jurisdiction. Postmark stores data on their servers, typically in the US or EU depending on the plan. For organizations subject to strict GDPR requirements, government agencies, or businesses in regulated industries, Keila's data sovereignty options provide compliance advantages that hosted platforms cannot match.
The Self-Hosting Reality
Self-hosting Keila gives you maximum control but requires maintaining servers, managing updates, handling backups, and ensuring uptime. Postmark's managed service handles all of this for you. The right choice depends on your team's technical capabilities and priorities. Organizations with DevOps teams often prefer self-hosting for control. Organizations without technical staff benefit from managed services that let them focus on marketing rather than infrastructure.