Customer.io is a customer engagement platform that enables marketers to build sophisticated automated messaging campaigns. With access to real-time behavioral data, users can create personalized and relevant messages to engage and retain customers. This includes sending emails, push notifications, SMS, in-app messages, and more through a visual building experience. Built for scale, Customer.io boasts users among over 5,300 companies, sending over 17 billion messages per year.
$100
per month
Sinch Mailgun
Score 9.1 out of 10
N/A
Mailgun is a transactional email API service which was owned and supported by Rackspace (acquired in 2012) and then spun off in 2017 as an independent and standalone entity. It is now supported by Sinch since that company's acquisition of Mailgun and Mailjet, through acquiring Pathwire.
$35
per month
Pricing
Customer.io
Sinch Mailgun
Editions & Modules
No answers on this topic
Foundation
$35
per month
Growth
$80
per month
Scale
$90
per month
Flex
Free
Offerings
Pricing Offerings
Customer.io
Sinch Mailgun
Free Trial
Yes
Yes
Free/Freemium Version
No
Yes
Premium Consulting/Integration Services
Yes
No
Entry-level Setup Fee
Optional
No setup fee
Additional Details
Essentials: For startups and small teams engaging customers on their mobile and web apps.
- Up to 5,000 profiles*, Send Emails, Push, In-App, and SMS, Visual Workflow Builder, Segmentation, Two Workspaces, Email Support, Customer Community
Premium: For high-growth companies looking for greater control over their messaging outcomes.
- Everything in Essentials, Custom Data + Message Volume, Premium Product Features, Additional Workspaces, 90-day Onboarding Program, Premium Email & Chat Support, Managed Deliverability, Dedicated IPs, Parcel Pro Licenses, HIPAA Compliance
Enterprise: For at-scale companies looking to create world-class customer experiences.
- Everything in Premium, Managed Infrastructure*, Customer Success Manager, Quarterly Success Reviews, Technical Account Manager*, Audit Logging & Data Governance*, Parcel Business Licenses, Migration Support*, *Available by consultation.
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.
Mailgun's pay-as-you-go pricing structure is fantastic, especially if you don't need to send that much email. The pricing, including the free tier, is much more generous than what you can get with some pricier providers, like SendGrid. I mainly just use Mailgun as an SMTP server for web services, and the service has been set-up-and-forget, which is great because I never even have to log onto the Mailgun website and do any work. Mailing list support also looks great for rolling-your-own and not relying on more expensive mailing list services.
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.
No built-in templating features (This was a bit sad after coming from Mandrill which excelled at this)
Dashboard UI (although easy to use) is a bit dated in appearance
Logs are cumbersome compared to Mandrill
Setting up TLD (top level domain) names (things like .online or .church) that are not common require an email to tech support (this is annoying)
Sometimes can be slow in delivery
Shared IP addresses can be SPAM filtered or delayed (requires an email to support to have a new one assigned - Note: this can be mitigated by buying a dedicated one for a monthly fee)
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.
The time for the initial setup is very quick, since you can start sending (thus developing) from their sandbox in no time. The actual configuration involves, as usual, some DNS changes that may require time but are well explained and documented. Once everything is set up, there are a lot of monitoring tools that you can use to optimize your lists.
There have been a few minor outages through the years, but nothing more than a few minutes. These small outages are to be expected in any kind of a SaaS product, but Mailgun handles them very well. We designed our software to just retry sending after a while if there is an outage. As far as I know, we have never had to do more than a few retry cycles. This is all automated on our end, so we rarely even notice. Our customers have never noticed any mail sending outages.
The API and the deliverability of emails is excellent. Their API is very responsive and performs perfectly fine. I have no complaints there. Their management interface though (accessed through the web) is pretty slow though. Searching through lists of emails when I'm tracking down a problem for a customer can take 10+ seconds which is annoyingly high for a modern web app.
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
You can't seem to get ANY support until you shell out hundreds of dollars per month. I even did this when we could not deliver mail with Mailgun, and the response was slow and inadequate. Nor would they refund my money. I'll never be a customer of Mailgun again.
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.
To be honest, the tools are quite similar and again I dont recommend using them as a standalone products, but they power the work we do via CRMs and our marketing campaigns. Mailgun integrates slightly better which it is why it is the preferred choice for our agency, as it integrations options seem to be better
Over the past six years, Mailgun has scaled with our growth very easily. We haven't had to make any code changes to handle our larger volume today, and their pricing has scaled naturally with our growth. As far as I know, there is nothing we will need to do in order to grow 10-fold. Mailgun just handles the load really well.
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.
By not investing in our mail server, we have saved huge amount of money and time. For configuration and installation of an email server on Linux-based server, we would have to hire a network administrator.
If email delivery is an issue in a hosting provider, another solution is to switch the hosting. Fortunately with Mailgun, we didn't need to try different hosts and experiment which one works best for emails. We can stick to our existing web hosting provider and would not need to change it just for the sake of improving email deliverability.
The pricing of Mailgun is very cheap and straightforward. First 10K emails are free every month and that's a big advantage for our organization because our volume of emails is rarely more than 10K per month.
