Best for
Best for product-led SaaS teams that trigger lifecycle messaging from event data and want the whole platform available over an API.
- Small and mid-sized
- Enterprise
Email Marketing Comparison
Customer.io vs. Sendy
At a glance
At a glance
Best for
Best for technically comfortable publishers and agencies who want to send large newsletters through Amazon SES without a monthly per-subscriber fee.
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | Customer.io | Sendy |
|---|---|---|
| Starting price | From $100 / month Essentials, billed monthly, for 5,000 profiles and 1 million emails a month. Premium starts at $1,000 a month and is billed yearly; Enterprise is quoted. Extra usage costs $0.009 per profile, $0.12 per 1,000 emails and $10 per 100,000 AI credits. | lower value $69 one-time Licence for one installation domain. Sending through Amazon SES costs $1.6 per 10,000 emails, billed by Amazon. Optional AI Assistant $39 and installation service $79, both one-time. Updates are free up to the next major version. |
| Free trial | Startup Program gives early-stage companies that have raised under $10M a full year free | No free trial or demo; the vendor states it will refund you if it doesn't work out |
| Commercial use | Not stated | Yes, a paid commercial licence |
| API | Yes, the Journeys UI API and CDP Data Pipelines API, plus a CLI, webhooks, mobile SDKs and an official MCP server | Yes, an API for subscribing, unsubscribing, deleting subscribers, checking subscription status and counts, listing lists and brands, and creating and sending campaigns |
| Hosting | Cloud (SaaS), with US and EU endpoints | Self-hosted on your own web hosting (PHP and MySQL or MariaDB), sending through Amazon SES |
| Made in | United States | Not stated |
| Campaign types | Yes, email, SMS, push, in-app messages, WhatsApp, LINE, webhooks and Slack, plus transactional messages | Yes, one-off campaigns, scheduled campaigns and autoresponders sent as drip sequences at set intervals or on a specific date, including annual sends |
| Automation and journeys | Yes, a visual workflow builder with branching logic, triggered by segment, event, form, relationship, date or webhook | Yes, drip autoresponders, plus rules and webhooks that trigger actions on events |
| Segmentation and personalisation | Yes, Audiences segments on customer profiles, events, account relationships and real-time data | Yes, segments built on conditions you define, included in or excluded from a campaign, plus custom fields |
| Templates and editor | Yes, Design Studio for creating messages at scale | Yes, a drag-and-drop editor with switching between drag-and-drop, WYSIWYG and HTML editing |
| Deliverability and testing | A/B and multivariate testing, conversion tracking, send-time optimisation and email content analysis on every plan; managed deliverability from the Premium plan | Bounces and complaints are processed automatically in real time, with custom domains for unsubscribe, web version and tracked links; sending runs through your own Amazon SES account |
| Ecommerce and CRM data | Yes, CDP Data Pipelines unify customer data and apps, with object types alongside people for accounts and other non-person records | Through third-party plugins for WooCommerce, Magento 2, Shopify, PrestaShop and Easy Digital Downloads |
| Integrations and API | Yes, the Journeys UI API and CDP Data Pipelines API, plus a CLI, webhooks, mobile SDKs for iOS, Android, React Native, Flutter and Expo, and an official MCP server | Yes, a documented API, Zapier, Make and n8n integrations, and plugins for WordPress, Drupal, Magento and other systems |
| AI features | Yes | Yes |
| MCP-ready | stated Yes | No |
| Deployment | more entries Cloud (SaaS), Browser-based | On-premise |
| Support | more entries Email helpdesk, Chat, Community forum | Email helpdesk |
| Onboarding | more entries Documentation and knowledge base, Guided onboarding | Documentation and knowledge base |
| Company size | Small and mid-sized, Enterprise | Not stated |
| Integrations | more entries Segment, Salesforce, HubSpot, Amplitude, Mixpanel, Snowflake, Amazon S3, Twilio, Typeform, Branch, Google Ads, Facebook Lead Ads | Amazon SES, Zapier, Make, n8n, WordPress, WooCommerce, Magento, Shopify, Drupal, PrestaShop, WHMCS |
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 Customer.io From $100 / month Sendy $69 one-time
- Free trial Customer.io Startup Program gives early-stage companies that have raised under $10M a full year free Sendy No free trial or demo; the vendor states it will refund you if it doesn't work out
- Deployment Customer.io Cloud (SaaS), Browser-based Sendy On-premise
- Hosting Customer.io Cloud (SaaS), with US and EU endpoints Sendy Self-hosted on your own web hosting (PHP and MySQL or MariaDB), sending through Amazon SES
- Support Customer.io Email helpdesk, Chat, Community forum Sendy Email helpdesk
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
Customer.io
Strengths
- Journeys triggered by product events, forms, relationships, dates or webhooks
- Official MCP server exposing the full Journeys UI and CDP Data Pipelines APIs, on US and EU endpoints
- LLM actions inside a workflow generate data and personalise content at send time
- Startup Program gives early-stage companies a full year free
Limitations
- Only Essentials publishes its volumes; Premium names a starting figure but quotes profiles and emails individually
- Billing counts objects as well as people towards the profile total
- Object types are capped per plan, at two on Essentials and ten on Premium
- Daily Routines, premium chat support and HIPAA compliance start at the Premium plan
Sendy
Strengths
- One-time licence of $69 instead of a monthly subscription
- Sending billed by Amazon SES at $1.6 per 10,000 emails
- White-label brands with client access, permissions, pricing and sending limits
- Drag-and-drop, WYSIWYG and HTML editors in one app
Limitations
- Needs your own web hosting and an Amazon SES account, with a sending limit requested from Amazon
- No free trial or demo
- One licence covers one installation domain, and updates are free only until the next major version
Plans
Pricing
Customer.io
- Essentials $100 Per month, billed monthly. 5,000 profiles (people and objects), 1 million emails a month, 2 object types, 2 workspaces, email and community support, basic data integrations.
- Premium $1,000 Per month, billed yearly, as a starting figure. Custom profile and email volumes, 10 object types, elevated AI Agent limits with custom skills, Daily Routines, premium chat and email support, 90-day onboarding support, premium data integrations and HIPAA compliance.
- Enterprise Not stated Quoted. Dedicated infrastructure and hardware, custom AI Agent limits, priority technical support, migration support, a dedicated Customer Success Manager and Technical Implementation Specialist, a shared Slack channel, audit logging and data governance.
Sendy
- Sendy licence $69 One-time, for one installation domain. Updates free up to the next major version.
- AI Assistant $39 One-time add-on that generates newsletters and subject lines and analyses reports.
- Installation service $79 One-time.
- Amazon SES sending $1.6 per 10,000 emails Billed by Amazon, not by Sendy.
What users say
Review Scores · opens after launch
Customer.io
- 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.
Sendy
- 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
Customer.io https://customer.io · checked against the official source on 2026-09-03
Sendy https://sendy.co · checked against the official source on 2026-10-28
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.