Customer.io vs. Sailthru

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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Sailthu is perfectly suited, no matter what level of technical skill you have or support from an Engineering team. That said, it includes many advanced features which can only be fully utilized when integrated with custom webhooks and after receiving customer data sent via their APIs. There may be easier solutions out there for less technical users or for people wanting a simpler setup to begin with.

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• 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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• Personalization - one of the most important things you can utilize when emailing people.
• Segmentation - Sailthru makes it very easy to build an audience based off their criteria; there are so many different fields to choose from. We use this mostly for geo-targeting and engagement.
• Analytics - post-campaign analytics are very easy to look at, customize your view, and download as a csv to share with your team and company.

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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.

• Giving more practical examples of technical setups, sometimes the only way to understand it is to see it.
• Can't filter lists by date created or date modified, particularly needed when tracking down a specific list or looking to remove older lists.
• Can't set up automated data dumps to an email address, has to be sent via API.

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The biggest factor is that even after two months of trying to go through their credit processes and getting the right consideration for the real damages we had with the tool not being able to send campaigns for days, their sales staff is still not willing to work with us on it, making us do the switch away from them right now. We got extremely disappointed by trying to work with them through those issues.

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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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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Their account management / sales staff doesn't seem to be taking the problems you experience very seriously - it took us 3 months and nudge emails to them every 2 weeks to ask for status updates (plus 6 different conversations with different people) to get a (very small credit) for a major issue, which in two months prohibited us from sending campaign emails for 2-3 days at a time.

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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Sailthru provided a powerful, easy-to-use platform that was able to adjust to the needs we had at Dotdash. It was able to support the simple campaigns where we would send static creative to all recipients and the complex dynamic campaigns where we were customizing content. The scale and flexibility really made it a great platform for us to use.

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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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• Sailthru has helped us build a welcome series that's much more effective than anything we had before.
• It's much easier to analyze transactional campaigns than our previous ESP.
• We're better able to run A/B tests and learn from the results -- all of which improves our email strategy.

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