Mailgun vs OneSignal Comparison
Compare Mailgun vs OneSignal features, pricing, and more.
Last updated: November 2026
Mailgun
6.8/10
Mailgun is a developer-focused email API and SMTP relay service that apps and businesses use to send, receive, track and validate transactional and bulk email.
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 | 6.8/10 | 7.1/10 |
| Scalability | 8/10 | 8/10 |
| Ease of Use | 5/10 | 8/10 |
| Customization | 7/10 | 6/10 |
| Security | 8/10 | 7/10 |
| Support | 6/10 | 6/10 |
| Cost | 6/10 | 7/10 |
| Integration | 8/10 | 8/10 |
| Analytics | 7/10 | 6/10 |
| Pricing | ||
| Free plan | Yes | Yes |
| Cheapest paid plan | $15/mo Basic | $19/mo Growth |
| Estimated cost for 10 users | $15/mo Basic | Free Free |
| Features | ||
| Email Marketing | ||
| A/B Testing | Not listed | |
| Segmentation | Not listed | |
| SMS Marketing | Not listed | |
Mailgun vs OneSignal cost by team size
Mailgun and OneSignal cost the same at 1 user; OneSignal costs less from 5 users.
| Team size | Mailgun | OneSignal |
|---|---|---|
| 1 user | FreeFree | FreeFree |
| 5 users | $15/moBasic | FreeFree |
| 10 users | $15/moBasic | FreeFree |
| 25 users | $15/moBasic | FreeFree |
| 50 users | $15/moBasic | 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 Mailgun
- Higher Customization score (7/10 vs 6/10)
- Higher Security score (8/10 vs 7/10)
- Better fit for developers (9/10 vs 7/10)
- Better fit for saas companies (9/10 vs 7/10)
Why choose OneSignal
- Lower estimated cost for 10 users: Free vs $15/mo
- Higher Ease of Use score (8/10 vs 5/10)
- Higher Cost score (7/10 vs 6/10)
- Better fit for marketing teams (7/10 vs 4/10)
- Better fit for small business (7/10 vs 4/10)
Pros & Cons
Mailgun
Pros
- Reviewers repeatedly praise the REST API and documentation as quick for developers to integrate.
- Deliverability and detailed per-domain searchable logs get strong marks from users.
- SOC 2 Type II and ISO 27001 certification, with 2FA, SAML SSO and AES-256 encryption at rest.
- A low entry price and a free tier of 100 emails a day for testing.
Cons
- It is API-first and complicated for non-technical users, with a dated dashboard where settings and logs can be hard to find.
- Several 2025 reviews report automated account suspensions with little warning.
- Short log retention on lower plans (1 day on Free and Basic).
- Reviewers call it costlier than rivals once volume grows, and inbox placement tools are a separate product.
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 6.8/10 for Mailgun. The largest gap is in Ease of Use: 5/10 for Mailgun and 8/10 for OneSignal.
OneSignal costs less for 10 users: free on its Free plan, against about $15/mo on its Basic plan for Mailgun, billed monthly.
Yes, both Mailgun and OneSignal have a free plan.
OneSignal is the better fit for marketing teams: we rate it 7/10 for them, against 4/10 for Mailgun.
