Best for
Best for marketing teams and agencies that want a polished drag-and-drop builder, prebuilt journeys and a large integration catalogue.
- Freelancers
- Small and mid-sized
- Enterprise
Email Marketing Comparison
Campaign Monitor vs. OneSignal
At a glance
At a glance
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
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Campaign Monitor | OneSignal |
|---|---|---|
| Starting price | lower value From $13 / month Lite plan for up to 500 contacts, billed monthly. The price rises with the contact count; annual billing takes 10% off, and nonprofits get 15% off. | 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 trial | Free plan for up to 500 contacts on a 30-day trial, with a 500 email send limit | 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 |
| Users | Not stated | The vendor states 200,000 apps, 1.5 billion monthly active users and 1.3 trillion messages sent a year |
| API | Yes, API access with 250+ integrations | 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 |
| Hosting | Cloud (SaaS) | Cloud (SaaS) |
| Made in | Not stated | United States |
| Campaign types | Yes, email campaigns and newsletters, with a website builder available as a paid add-on | Email, mobile push, web push, in-app messaging, SMS and RCS, plus iOS Live Activities, all from the same dashboard |
| Automation and journeys | Yes, prebuilt customer journeys and drip campaigns, with unlimited automated emails on Essentials and above | 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 |
| Segmentation and personalisation | Yes, segmentation, with advanced engagement segments on the Premier plan | 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 |
| Templates and editor | Yes, a drag-and-drop builder with 100+ responsive templates and support for custom-coded templates | 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 |
| Deliverability and testing | Yes, A/B testing, link review, and design and spam 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 |
| Ecommerce and CRM data | Yes, CRM and ecommerce connections among the 250+ integrations | 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 |
| Integrations and API | Yes, API access with 250+ integrations | 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 |
| AI features | Yes | Yes |
| MCP-ready | No | stated Yes |
| Deployment | Cloud (SaaS), Browser-based | Cloud (SaaS), Browser-based |
| Support | Email helpdesk, Phone | Not stated |
| Onboarding | Documentation and knowledge base, Video tutorials | Documentation and knowledge base, Guided onboarding |
| Company size | Freelancers, Small and mid-sized, Enterprise | Freelancers, Small and mid-sized, Enterprise |
| Integrations | Salesforce, WordPress, Shopify, Unbounce, Intercom, OptinMonster, Facebook Lead Ads, AdRoll, Lexer, Qgiv, Raiser's Edge NXT | more entries Segment, HubSpot, Amplitude, Mixpanel, Adobe Experience Cloud, Snowflake, Google BigQuery, Databricks, RevenueCat, ActiveCampaign, Adjust, Adapty |
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 Campaign Monitor From $13 / month OneSignal Free plan, then from $19 / month
- Free trial Campaign Monitor Free plan for up to 500 contacts on a 30-day trial, with a 500 email send limit 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
- MCP-ready Campaign Monitor No OneSignal Yes
- API Campaign Monitor Yes, API access with 250+ integrations 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
- Campaign types Campaign Monitor Yes, email campaigns and newsletters, with a website builder available as a paid add-on OneSignal Email, mobile push, web push, in-app messaging, SMS and RCS, plus iOS Live Activities, all from the same dashboard
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Campaign Monitor
Strengths
- Drag-and-drop builder with 100+ responsive templates and custom-coded templates
- Prebuilt customer journeys and drip campaigns
- AI Writer, AI Email Booster and AI Segment Mapper
- 250+ integrations, including CRM and ecommerce, with an API
Limitations
- Advanced engagement segments are reserved for the Premier plan
- The website builder costs $10 a month extra below the Premier plan
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
Plans
Pricing
Campaign Monitor
- Free $0 / month Up to 500 contacts on a 30-day trial, with a 500 email send limit; no credit card required.
- Lite $13 / month Up to 500 contacts, billed monthly, with sends capped at five times the contact count (2,500 at this size). Rises to $397 for 25,001 to 50,000 contacts. Annual billing takes 10% off.
- Essentials $31 / month Up to 500 contacts, billed monthly. Unlimited monthly sends, unlimited automated emails and priority support. Rises to $644 for 25,001 to 50,000 contacts. Annual billing takes 10% off.
- Premier $171 / month Up to 500 contacts, billed monthly. Unlimited monthly sends, advanced engagement segments, send time optimization, phone support and the website builder included. Rises to $1,074 for 25,001 to 50,000 contacts. Annual billing takes 10% off.
- Enterprise Not stated Custom pricing, also for lists above 50,000 contacts, with a dedicated account manager and multi-brand management.
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.
What users say
Review Scores · opens after launch
Campaign Monitor
- 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.
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.
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.
Every review is read by a person before it appears. An email address is required and is confirmed: we send a link to it, and a review does not reach us until the author opens that link, so a review has a sender who was reachable at least once rather than being anonymous. Where what somebody writes needs backing, we ask them for evidence that they used the product, and a review that does not get it is not published. We publish positive and negative reviews alike, we pay nothing and offer nothing for a review, and we accept none that was bought or incentivised.
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
Campaign Monitor https://www.campaignmonitor.com · checked against the official source on 2026-10-03
OneSignal https://onesignal.com · checked against the official source on 2026-09-23
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.