Keila vs OneSignal: Complete Comparison (2026)
An in-depth comparison of Keila and OneSignal to help you choose the right tool for your business.
Last updated: November 2026
Keila
5.8/10
Open-source, AGPL-licensed newsletter platform from Germany for sending email campaigns and running sign-up forms, available as an EU-hosted cloud service or self-hosted with Docker.
OneSignal
7.1/10
OneSignal is a customer messaging platform for sending mobile push, web push, in-app messages, email and SMS to app and website users.
Feature-by-Feature Comparison
| Feature | | |
|---|---|---|
| Scores | ||
| Overall Rating | 5.8/10 | 7.1/10 |
| Scalability | 5/10 | 8/10 |
| Ease of Use | 6/10 | 8/10 |
| Customization | 7/10 | 6/10 |
| Security | 6/10 | 7/10 |
| Support | 4/10 | 6/10 |
| Cost | 9/10 | 7/10 |
| Integration | 3/10 | 8/10 |
| Analytics | 4/10 | 6/10 |
| Pricing | ||
| Free plan | No | Yes |
| Cheapest paid plan | €8/mo Keila XS | $19/mo Growth |
| Estimated cost for 10 users | €8/mo Keila XS | Free Free |
| Features | ||
| Email Marketing | ||
| Segmentation | ||
| A/B Testing | Not listed | |
| SMS Marketing | Not listed | |
Keila vs OneSignal cost by team size
| Team size | Keila | OneSignal |
|---|---|---|
| 1 user | €8/moKeila XS | FreeFree |
| 5 users | €8/moKeila XS | FreeFree |
| 10 users | €8/moKeila XS | FreeFree |
| 25 users | €8/moKeila XS | FreeFree |
| 50 users | €8/moKeila XS | FreeFree |
The plan that fits each team size, billed monthly, before add-ons and usage charges. Each cost opens that tool's pricing calculator for the team size.
Which One Should You Choose?
Why choose Keila
- Higher Cost score (9/10 vs 7/10)
- Higher Customization score (7/10 vs 6/10)
Why choose OneSignal
- Has a free plan (Keila does not)
- Higher Integration score (8/10 vs 3/10)
- Higher Scalability score (8/10 vs 5/10)
- Better fit for enterprise (7/10 vs 3/10)
- Better fit for mid-market (7/10 vs 3/10)
Pros & Cons
Keila
Pros
- Fully open source under AGPLv3, with no proprietary premium features, so it can be self-hosted free with Docker.
- Pricing is based on emails sent and every plan includes unlimited contacts, which helps large lists that send rarely.
- The cloud is hosted in Germany and France, which suits organisations with GDPR concerns.
- Several editing modes are available, including a block editor, Markdown, MJML and plain text, plus Liquid personalisation.
- Mail can go out through your own SMTP, SES, Mailgun, Postmark or SendGrid account.
Cons
- There is no free cloud plan, and pricing is listed only for monthly billing.
- Automation is basic, and the template library is small, according to comparison reviews.
- There are few integrations, and the Zapier connector is still in private beta.
- No security certifications are published.
- It has no e-commerce, SMS or landing page builder features.
OneSignal
Pros
- A free plan with unlimited push up to 1,000 MAU and 10,000 emails a month makes it cheap to start.
- Push, in-app, email and SMS run from one platform with cross-channel journeys.
- Reviewers on G2 and PeerSpot say the dashboard is easy for non-technical marketers to use.
- A broad integration catalog covers CDPs such as Segment, RudderStack and Hightouch, data warehouses, and analytics tools.
Cons
- PeerSpot reviewers call it expensive for large subscriber bases.
- Free and Growth plans cap segments at 6 and 10, and reporting history at 30 and 90 days.
- SMS pricing is not published and requires a sales conversation.
- Reviewers mention unclear documentation for advanced cases and limited in-app design options.
Not sold on either?
Frequently Asked Questions
OneSignal scores higher on our Marketing criteria: 7.1/10 against 5.8/10 for Keila. The largest gap is in Integration: 3/10 for Keila and 8/10 for OneSignal.
OneSignal has a free plan; Keila does not list one.
OneSignal is the better fit for enterprise: we rate it 7/10 for them, against 3/10 for Keila.
