Customer.io vs. Twilio SendGrid

Talking from the perspective of a marketer at a SaaS with average. 50K email subscribers, Customer IO has been an excellent tool for us. Our requirements include sending users newsletters, marketing emails, and transactional emails, running lead-nurturing campaigns, and more. For a comprehensive use case like ours, CustomerIO is great. While it also has a learning curve, when you have such requirements, it’s worth it. I don’t think CustomerIO is the best fit if you have basic requirements like only weekly newsletter emails.

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If you're prepared to build out your whole staff UX, audience creation, email production, and analytics on your own using API, this tool may have that flexibility. If you require a sturdy drag and drop production tool, this tool has it but at the expense of a lot of other critical functionality. Out of the box analytics/reporting, is extremely limited. Complex queries, even something like pulling those who haven't engaged in email within a certain time period, is clunky. If you require any support at all, this is not the tool for you. I'm a deliverability consultant and have used many of the top email marketing tools and SendGrid has been extremely difficult for my team. I do not recommend it. Shiny and bright during sales, pretty disappointing thereafter.

• Managing users, attributes and events. You are easily able to modify any user, based on their ID, and add or remove attributes, assign events to them. That makes it very easy to segment later and to assign them to several campaigns based on behavior. Just a warning: this integration isn't so easy (at least it wasn't for us).
• Creating workflows of campaigns is very easy. You can quickly create behavioral campaigns based on attributes, segments and add elements to the workflow. You can send an email, then wait, then send another, then exit the campaign if they converted, etc. The workflow is easy to configure and very powerful for automation.
• We don't use many email templates (we make them in MJML) but it's very easy to add senders, to change templates and in general to test designs.
• Deliverability works very well, at least for us. It sends emails pretty fast and without issues.
• Exporting is very quick and easy. Importing wasn't a feature until recently, but it works well too.
• Seeing activity it's also useful. In general, logs are awesome (be it of a customer, of activity on the site, email sends, etc.).
• We don't use environments, but it might be very useful for a bigger company.

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• Managing email lists / audiences is easy with features like groups and segments.
• They provide pre-built email templates that are very easy to modify. It is also super easy to create new email templates with their drag-and-drop email builder.
• Provides clear / easy-to-read analytics of email campaigns.
• I can easily import large email contact lists all at once or add a user manually one-at-a-time, when needed.

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• Price is quite expensive for Premium or once you get into high volumes of contacts.
• Depending on how you'll use it, it may require some help from developers to set up.
• Despite the support being great, you have to email them, there's not chat feature.

• Not necessarily their Email API but their email in general - they are currently in beta for automated email sequences but are still bare bones. Much more work is needed before it can be used mainstream and be able to convert everything to SendGrid.
• Helping with warming up our dedicated IP for the best-sending score.
• We seem to hit the promotions folder a decent amount (maybe the IP problem above) and even a lot of their emails hit my spam or promotions folder (whether they be transactional or marketing) which isn't a great sign when trusting an ESP.
• Transactional email sequences would be a huge plus.
• Now that Twilio owns SenGrid, having an integrated platform where you could see all our transactional emails together.
• Better reporting and split reporting between transactional and marketing emails.

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Super intuitive and easy interface to start off with. There are not a lot of guides and the documentation is helpful but not super extensive, but even if you're a little technical, you can easily figure most of the things out by yourself. Everything is super easy to start with and the platform does not overwhelm you with a lot of options, or data.

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It is usable but needs improvement in overall user experience and ease of use. A new joinee/anyone new to the tool would need more tarining currently before he can use the platform seamlessly. The set-up to value realization time for Twilio SendGrid customers is generally high because of this concern.

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My experience with their support team has always been great. Very quick to respond, have an online chat, and are very helpful. They helped me resolve any issues I've had every time in a professional and knowledgeable manner. We've now switched to another tool, and I can't even compare the service level we get there to customer.io

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Twilio SendGrid Email API is everything we want it to be, and we have no reason to look for any other solution. Features and pricing match exactly what we need. As developers for SaaS products, Twilio SendGrid Email API provides a great service. I hope that they stay this way and don't inflate the service with too many marketing oriented features, because there are other tools for that and Twilio SendGrid Email API is a API for sending email first and foremost.

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Customer.io was really the first pure, full-featured drip email program on the market and as far as I know, it's still the simplest and best overall for that specific function. SendGrid has also added drip campaign features, but I would seriously evaluate Customer.io against any other drip email provider because they really have all the key elements you need to make it work.

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Sendgrid has a lot of features that other providers have and a few more - like the dynamic template builder, which AWS SES doesn't have. We choose the provider based on the scenario of use and the provider we're using. If we're going to be making regular changes to a template, then we'd go with Sendgrid, as the changes will be easier to make and don't necessarily require developer intervention.

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• Positive impact on the sales side. I'm not sure about the specific ROI (you have to include the designer and the time it takes to set up) but you certainly get back the investment in a few months, once you are able to scale your email marketing.
• Customer experience is way better by having more segmented, contextual and accurate messages sent to them.
• Integration is costly and it will take several days or weeks to be fully achieved. Expect to invest some money on this.

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• As it was cheaper than the transactional service we previously used, it saved costs.
• The API was relatively easy to work with so it helped us ship the service and test it quickly.
• We still use the transactional email service, even though we recognize its limits as it meets our immediate needs.

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