VS
Customer.io vs OneSignal Email
Two transactional email providers, compared on price, features and ratings — so you can pick fast.
Updated June 2026
The verdict
Customer.io and OneSignal Email take different pricing approaches. OneSignal Email rates higher with developers (4.7 vs 4.4 on G2). Pick based on volume and team — the scorecard below breaks down where each one leads.
By the numbers
How do Customer.io and OneSignal Email compare?
Leader highlighted · figures as of June 2026
G2 rating · out of 5
4.4
Customer.io
4.7
OneSignal Email
Trustpilot · out of 5
3.2
Customer.io
2.6
OneSignal Email
Drag-and-drop editor · visual builder
Yes
Customer.io
Yes
OneSignal Email
Scorecard
Feature by feature, how do they stack up?
| Capability | | |
|---|---|---|
| Pricing | ||
| Starting paid plan | $100/mo | $19/mo |
| Cost per 1k @ 100k | — | $1.5 |
| Pricing model | Subscription | Hybrid |
| Overage | Profile-based pricing: additional profiles $0.009 each; additional emails $0.12 per 1,000 over the plan's bundled allowance; AI credits $10/100K. Email volume does not map to a per-email tier. | $1.50 / 1,000 sends |
| Deliverability | ||
| Dedicated IP | Plan-gated | Plan-gated |
| Deliverability tooling | Yes | Yes |
| Automated IP warmup | Yes | Yes |
| Suppression management | Yes | Yes |
| SPF / DKIM / DMARC | Yes | Yes |
| API & sending | ||
| Transactional API | Yes | Yes |
| Marketing campaigns | Yes | Yes |
| SMTP relay | No | — |
| Inbound routing | No | — |
| Dynamic templates | Yes | Yes |
| Batch send | Yes | Yes |
| Scheduled send | Yes | Yes |
| Developer experience | ||
| Official SDKs | Ruby, Python, Node.js, Go, PHP, JavaScript (Web), iOS, Android, React Native, Flutter, Expo | Node.js, Python, Java, Go, PHP, Ruby, C#, Rust |
| Event webhooks | Yes | Yes |
| Drag-and-drop editor | Yes | Yes |
| Custom HTML editor | Yes | Yes |
| Email validation | No | — |
| Analytics | ||
| Open / click tracking | Yes | Yes |
| Analytics dashboard | Yes | Yes |
| A/B testing | Yes | Yes |
| Compliance | ||
| EU data residency | Yes | — |
| SOC 2 | Yes | Yes |
| HIPAA | Yes | BAA |
| GDPR | Yes | Yes |
| ISO 27001 | Yes | Yes |
| Support | ||
| Support channels | Community + email (Essentials); chat (Standard); dedicated CSM + technical specialist (Premium/Enterprise) | Email, Community |
| 24/7 support | — | Yes |
| Support SLA | Plan-gated | Plan-gated |
| Migration assistance | Yes | — |
Decision helper
Which should you choose?
Pick Customer.io
Pick OneSignal Email
FAQ
Common questions
OneSignal Email rates higher on G2 (4.7 vs 4.4). Ratings are aggregated from public review platforms as of the date shown.
Keep comparing
Related comparisons
Why not both?
Use both behind one API.
Route Customer.io, OneSignal Email, or both — and switch providers without changing your code. Courier sits in front of every channel.
Pricing, plans and feature availability as of June 2026 and may change. Ratings are aggregated from public review platforms.
© 2026 Courier. All rights reserved.