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Most buyers should pick OneSignal.
Pick OneSignal if you want a free entry point or Growth from $19/month, with push, email, SMS/RCS and in-app options. Customer.io starts at $100/month and limits Essentials to 5,000 profiles, but fits teams building data-driven messaging journeys and using customer data to personalize campaigns. OneSignal offers more published channel variety and a free tier, though SMS/RCS pricing is not published and its paid annual tiers are custom-priced.
01Side by side
| Customer.io | OneSignal | |
|---|---|---|
| Starting price | Essentials: $100/month, billed monthly | Growth: starts at $19/month |
| Free plan | No free plan listed | Free plan with capped sends, audiences, and journeys |
| Best for | Teams starting with data-driven messaging | Teams onboarding, engaging, and retaining users |
| Core strength | Event-based automation and personalized journeys | Push, email, SMS/RCS, and in-app messaging |
| Learning curve | Not published | Not published |
| Integrations and data | Uses customer data; Essentials includes 2 object types | Connects messaging with analytics and customer data tools |
| Team and seat costs | Seat pricing not published | Seat pricing not published |
| Support | Premium includes 90-day onboarding; Enterprise priority support | Support details not published |
Customer.io Choose Customer.io if
- Choose Customer.io if you need data-driven messaging journeys.
- Choose Customer.io if 5,000 profiles cover your Essentials audience.
- Choose Customer.io if Premium's 90-day onboarding support matters.
OneSignal Choose OneSignal if
- Choose OneSignal if you want a free plan to start.
- Choose OneSignal if a $19/month entry price fits your budget.
- Choose OneSignal if you need push, email, SMS/RCS, and in-app options.
02Pricing compared
OneSignal has the lower-cost entry point: its free plan includes 10,000 email sends a month, push and in-app messaging for up to 1,000 MAU, and three active journeys. Growth starts at $19/month, with five active journeys and 10 audience segments. After its 20,000 free monthly email sends, additional Growth email costs $1.50 per 1,000 sends; SMS/RCS pricing is not published.
Customer.io Essentials costs $100/month and includes 5,000 profiles and 1 million emails per month. Premium is listed at $1,000/month, billed annually; Enterprise pricing is not published. Customer.io charges $0.12 per additional 1,000 emails, while its additional-profile price is $0.009 and the billing unit is not stated. For predictable costs, check volume and add-ons before switching.
03Features and depth
Both platforms support automated customer journeys, segmentation, personalization, analytics and AI-assisted campaign work. Customer.io centers on customer data and data-driven messaging: its journeys use triggers, content, timing and logic, while Design Studio supports message creation at scale. Its AI agent can build automations conversationally and provide campaign recommendations.
OneSignal lists more channel variety: push, email, SMS/RCS and in-app messaging. Its AI can draft, send, test and optimize campaigns within brand guardrails. The free plan allows three active journeys; Growth allows five, Professional 20 and Enterprise unlimited. Customer.io Essentials includes two object types, with 10 on Premium; Enterprise has custom limits. OneSignal also lists mobile SDKs for Android, iOS, Flutter, React Native, Expo and Unity. SMS/RCS is available, but its price is not published.
04Ease of use and learning curve
Our review scores put Customer.io slightly ahead on ease of use: 7.5 versus OneSignal’s 7. Neither score tells us how long implementation takes, and the published materials do not publish setup-time comparisons.
Customer.io’s conversational AI agent is designed to help build automations, while OneSignal’s AI supports campaign drafting, sending, testing and optimization. Those features may help with campaign work, but they do not remove the need to configure data, audiences and journeys. Customer.io lists 90-day onboarding support on Premium; the published plan details do not specify onboarding support for Essentials. OneSignal’s paid annual plans are custom-priced, so confirm support terms with sales.
Questions people ask
Who are OneSignal’s main competitors?
This comparison covers Customer.io, one alternative for customer-data-driven messaging journeys. The published material does not identify or rank OneSignal’s other competitors, so we can’t name a definitive competitor set from these sources alone.
What is the best customer engagement platform?
There is no single best choice in the published details. OneSignal offers a free tier and a wider published channel mix; Customer.io focuses on data-driven messaging journeys and starts at $100/month. Compare your channel needs, profile volume and total messaging costs.
Is Customer.io worth it?
It may suit teams that need data-driven messaging journeys and can work within Essentials’ 5,000-profile cap at $100/month. OneSignal offers a free starting tier and Growth from $19/month, but SMS/RCS pricing is not published. Compare expected volume and add-ons before deciding.
What is Customer.io’s net worth?
Customer.io’s net worth is not published on the vendor's site. The available figures cover product pricing, not company valuation or financial statements, so we can’t give a sourced estimate.