Best for
Best for product and growth teams running app-first lifecycle messaging, where push and in-app carry as much of the programme as email.
- Freelancers
- Small and mid-sized
- Enterprise
Email Marketing Comparison
OneSignal vs. Resend
At a glance
At a glance
Best for
Best for product and engineering teams that want transactional email, broadcasts and templates in the same codebase as the application that sends them.
- Freelancers
- Small and mid-sized
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | OneSignal | Resend |
|---|---|---|
| Starting price | lower value Free plan, then from $19 / month The Growth platform fee, billed monthly. Messaging is metered on top: $0.012 per monthly active user for mobile push, $0.004 per web push subscriber and $1.50 per 1,000 email sends after the first 20,000 a month. Professional and Enterprise are annual contracts with quoted pricing and volume discounts. | Free tier; Pro from $20 / month Transactional and marketing volume are billed separately. The transactional ladder runs Free, Pro from $20 per month and Scale from $90 per month, priced in bands by monthly email volume; marketing runs Free, Pro Marketing from $40 per month and Enterprise, priced by contact count. |
| Free trial | Free plan across all channels, with 10,000 email sends a month and unlimited mobile push and in-app messaging for up to 1,000 monthly active users | Free tier: 3,000 emails per month, 100 per day, 3 domains, plus 1,000 marketing contacts |
| Users | The vendor states 200,000 apps, 1.5 billion monthly active users and 1.3 trillion messages sent a year | Not stated |
| API | Yes, unlimited API send access on every plan, SDKs for Android, iOS, Flutter, React Native, Expo and Unity, and a hosted MCP server in open beta | Yes, REST API with official SDKs for Node.js, Python, PHP, Ruby, Go, Rust, Elixir, Java and .NET, plus a CLI, webhooks and an official MCP server |
| Hosting | Cloud (SaaS) | Cloud (SaaS) |
| Made in | United States | Not stated |
| Campaign types | Email, mobile push, web push, in-app messaging, SMS and RCS, plus iOS Live Activities, all from the same dashboard | Transactional email over the API, broadcasts to contacts and segments, and inbound email by pointing MX records at Resend |
| Automation and journeys | Journeys, a visual drag-and-drop workflow builder with branching, cross-channel flows, webhook steps and unlimited message steps. Active journeys are capped by plan at 3 on Free, 5 on Growth and 20 on Professional, and are unlimited on Enterprise | Yes, flows triggered by custom events from your own application, built from condition, delay, wait for event, send email, contact update, contact delete and add to segment steps, with a Runs view for debugging |
| Segmentation and personalisation | Audience segments, data tags and custom events, with timezone delivery, dynamic content and personalised notifications on every plan and intelligent delivery, time-delayed sends and retargeting from Growth up. Segments and tags are capped by plan, from 6 of each on Free to unlimited on Enterprise | Yes, contacts with custom properties grouped into segments, plus Topics so recipients can opt in or out of individual categories |
| Templates and editor | No-code and HTML message builders, free prebuilt templates, a drag-and-drop email editor with full HTML control, and Liquid syntax for dynamic content | React Email, a component-based template system written in code; there is no drag-and-drop builder |
| Deliverability and testing | Email auto warm-up on every plan, plus A/B testing that is standard on Free and Growth and multivariate on the annual plans. Sending uses shared IPs on Free and Growth, with a dedicated IP available on Professional and Enterprise depending on volume | Domain verification with SPF, DKIM and DMARC, delivery event webhooks and event monitoring in the dashboard; dedicated IPs are a $30 per month add-on on Scale and above |
| Ecommerce and CRM data | More than 30 core integrations across analytics, CRM, customer data platforms and data warehouses, including Segment, HubSpot, Amplitude, Mixpanel, Adobe Experience Cloud, Snowflake, Google BigQuery, Databricks and RevenueCat, with premium integrations available for purchase on the annual plans | Contacts are created and updated over the API or bulk-imported by CSV up to 200 MB, with custom properties carrying the data used for personalisation |
| Integrations and API | Yes, unlimited API send access on every plan, SDKs for Android, iOS, Flutter, React Native, Expo and Unity, and a hosted MCP server in open beta that exposes messaging, users, segments, templates, exports and analytics to an outside AI assistant | Yes, REST API with bearer key authentication, a batch endpoint for up to 100 messages per request, SDKs for nine languages, a CLI, webhooks and an official MCP server |
| AI features | stated Yes | No |
| MCP-ready | Yes | Yes |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | Not stated | Email helpdesk |
| Onboarding | more entries Documentation and knowledge base, Guided onboarding | Documentation and knowledge base |
| Company size | Freelancers, Small and mid-sized, Enterprise | Freelancers, Small and mid-sized, Enterprise |
| Integrations | Segment, HubSpot, Amplitude, Mixpanel, Adobe Experience Cloud, Snowflake, Google BigQuery, Databricks, RevenueCat, ActiveCampaign, Adjust, Adapty | Not stated |
Add a tool
Adds a column to the table, from the tools in this category.
Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price OneSignal Free plan, then from $19 / month Resend Free tier; Pro from $20 / month
- Free trial OneSignal Free plan across all channels, with 10,000 email sends a month and unlimited mobile push and in-app messaging for up to 1,000 monthly active users Resend Free tier: 3,000 emails per month, 100 per day, 3 domains, plus 1,000 marketing contacts
- AI features OneSignal Yes Resend No
- API OneSignal Yes, unlimited API send access on every plan, SDKs for Android, iOS, Flutter, React Native, Expo and Unity, and a hosted MCP server in open beta Resend Yes, REST API with official SDKs for Node.js, Python, PHP, Ruby, Go, Rust, Elixir, Java and .NET, plus a CLI, webhooks and an official MCP server
- Campaign types OneSignal Email, mobile push, web push, in-app messaging, SMS and RCS, plus iOS Live Activities, all from the same dashboard Resend Transactional email over the API, broadcasts to contacts and segments, and inbound email by pointing MX records at Resend
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
OneSignal
Strengths
- The free plan carries every channel, including unlimited mobile push for up to 1,000 monthly active users
- Unlimited contacts and unlimited API send access on every plan, the free one included
- Push, in-app, email, SMS and RCS run on one platform, so a lifecycle programme does not span two vendors
- Official SDKs for Android, iOS, Flutter, React Native, Expo and Unity
- A hosted MCP server lets an outside AI assistant query analytics and operate campaigns
Limitations
- Active journeys, audience segments and data tags are all capped below the Enterprise plan
- Frequency capping, conversion metrics and CSV exports start on the annual Professional plan
- Cost follows monthly active users and send volume, so a large but lightly engaged audience gets expensive
- Dedicated sending IPs are limited to the annual plans and depend on volume
- Professional and Enterprise pricing is quoted rather than published
Resend
Strengths
- Transactional sending, broadcasts, contacts and automations on one API and one account
- Official SDKs for Node.js, Python, PHP, Ruby, Go, Rust, Elixir, Java and .NET, plus a CLI
- Standing free tiers on both ladders rather than a time-limited trial
- Inbound email by pointing MX records at Resend, delivered as webhooks
- Official MCP server, so the platform can be driven by AI agents
Limitations
- Templates are React components, so building an email needs a developer
- Two separate price ladders, one for sending volume and one for contacts
- Dedicated IPs, extra domains and SSO are priced as add-ons on top of the plan
- SSO and dedicated IPs require the Scale plan or above
- The free tier caps sending at 100 emails per day
Plans
Pricing
OneSignal
- Free $0 Per month. All channels, basic automation, analytics and personalisation, OneSignal AI and the MCP server, 10,000 email sends a month, unlimited mobile push and in-app messaging for up to 1,000 monthly active users, 3 active journeys and 6 audience segments.
- Growth $19 Per month, starting price. Adds more automation, more integrations, prioritised support and better analytics and personalisation. Messaging is metered on top: $0.012 per monthly active user for mobile push, $0.004 per web push subscriber and $1.50 per 1,000 email sends after the first 20,000.
- Professional Not stated Annual contract, quoted, with volume discounts. Adds advanced marketing and analytics, all integrations, advanced experiments, advanced permission management, 20 active journeys and reporting history up to a year.
- Enterprise Not stated Annual contract, quoted. Adds unlimited personalisation, reporting history up to two years, a security and compliance package, a custom SLA and a dedicated success manager.
Resend
- Free $0 3,000 emails per month, capped at 100 per day, 3 domains, 10,000 automation runs and 30-day data retention. Marketing side is free up to 1,000 contacts.
- Pro $20 Per month, 50,000 emails and 10 domains, no daily limit, 5 webhook endpoints. $35 per month for 100,000 emails. Overage $0.90 per 1,000 emails.
- Scale $90 Per month, from 100,000 emails and 1,000 domains, 10 webhook endpoints and a dedicated Slack channel. Rises through $160, $350, $650, $825 and $1,150 per month up to 2.5 million emails, with the overage rate falling from $0.90 to $0.46 per 1,000.
- Pro Marketing $40 Per month for 5,000 contacts, rising to $650 per month for 150,000 contacts.
- Enterprise Not stated Custom volume and contact limits, a 99.99% uptime SLA, a dedicated customer success manager, migration support and flexible AI credits.
What users say
Review Scores · opens after launch
OneSignal
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
Resend
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Nothing has been published here yet, and no score is shown. How a review is checked before it appears is described below.
How we check reviews
Before sending, the author has to confirm three things: that they have used the product themselves, that they work neither for the vendor nor for a competitor, and that nobody is paying them for the review. We also ask whether the vendor invited them to write it. That answer is required, either answer is accepted, and it stays with the review.
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What we cannot do is verify a purchase. There is no shop here and no account, so whether the author really used the tool rests on their own declaration, on whatever we ask them for, and on the plausibility of what they write. We say so rather than implying a check that does not exist.
A vendor cannot buy a review, and cannot have one removed or changed because they dislike it. We remove or edit a review only if it breaks our rules or the law, for example a false statement of fact. Paid placement has no effect on which reviews appear or on any score.
Where this comes from
Where this comes from
OneSignal https://onesignal.com · checked against the official source on 2026-09-23
Resend https://resend.com · checked against the official source on 2026-09-07
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.