Customer.io vs OneSignal Comparison
Compare Customer.io vs OneSignal features, pricing, and more.
Last updated: November 2026
Customer.io
6.5/10
Customer.io is a behavior-driven messaging platform that lets product-led and tech companies automate email, push, in-app, SMS and WhatsApp messages based on user data.
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 | 6.5/10 | 7.1/10 |
| Scalability | 8/10 | 8/10 |
| Ease of Use | 5/10 | 8/10 |
| Customization | 9/10 | 6/10 |
| Security | 8/10 | 7/10 |
| Support | 5/10 | 6/10 |
| Cost | 4/10 | 7/10 |
| Integration | 8/10 | 8/10 |
| Analytics | 5/10 | 6/10 |
| Pricing | ||
| Free plan | No | Yes |
| Cheapest paid plan | $100/mo Essentials | $19/mo Growth |
| Estimated cost for 10 users | $100/mo Essentials | Free Free |
| Features | ||
| A/B Testing | ||
| Email Marketing | ||
| Segmentation | ||
| SMS Marketing | ||
| Landing Pages | Not listed | |
Customer.io vs OneSignal cost by team size
OneSignal costs less at every team size we checked.
| Team size | Customer.io | OneSignal |
|---|---|---|
| 1 user | $100/moEssentials | FreeFree |
| 5 users | $100/moEssentials | FreeFree |
| 10 users | $100/moEssentials | FreeFree |
| 25 users | $100/moEssentials | FreeFree |
| 50 users | $100/moEssentials | 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 Customer.io
- Higher Customization score (9/10 vs 6/10)
- Higher Security score (8/10 vs 7/10)
- Better fit for saas companies (9/10 vs 7/10)
Why choose OneSignal
- Has a free plan (Customer.io does not)
- Lower estimated cost for 10 users: Free vs $100/mo
- Higher Ease of Use score (8/10 vs 5/10)
- Higher Cost score (7/10 vs 4/10)
- Better fit for small business (7/10 vs 5/10)
Pros & Cons
Customer.io
Pros
- Its visual workflow builder supports branching, goals and loops, and it can coordinate email, push, in-app, SMS and WhatsApp in one flow.
- Segmentation can use custom events, attributes and inactivity windows, and a built-in CDP stores custom objects.
- Every plan includes API and webhook access, and reviewers say developers can connect it easily.
- It holds SOC 2 Type II and ISO 27001 certifications, supports HIPAA, offers SSO, and lets you choose US or EU data residency.
- Startups that have raised under $10M can get up to 12 months free.
Cons
- Every stored profile counts toward the bill, inactive ones included, so costs climb quickly as the contact list grows.
- Setup has a steep learning curve and usually needs a developer to implement event tracking.
- There are no native landing pages or signup forms.
- Reviewers say reporting is limited and often needs data exports.
- Chat support starts at Premium, and Essentials gets only email and community support.
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 6.5/10 for Customer.io. The largest gap is in Cost: 4/10 for Customer.io and 7/10 for OneSignal.
OneSignal costs less for 10 users: free on its Free plan, against about $100/mo on its Essentials plan for Customer.io, billed monthly.
OneSignal has a free plan; Customer.io does not list one.
Customer.io is the better fit for saas companies: we rate it 9/10 for them, against 7/10 for OneSignal.
