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2 Ratings
7 Ratings
2 Ratings
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Score 8.5 out of 101
7 Ratings
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Score 9.2 out of 101

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Likelihood to Recommend

250ok Inbox

250ok is a great tool for companies that have recently switched ESPs to monitor inbox placement or for companies that historically have been having email deliverability issues and would like to learn about the root cause and improve. Unlike ReturnPath, 250ok doesn't offer certification, but honestly, you don't need certification if you follow the Gmail/Microsoft/AOL/Yahoo bulk sender guidelines. I haven't seen a company which significantly improved their results with that certification and I've been working for one major ESP for 7 years. 250ok is a good diagnostic/monitoring tool but it is not a panacea for those who continue to violate sender guidelines due to poor list/content management.
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Customer.io

Customer.io is perfect for drip email campaigns, meaning any scenario where you need to send a series of emails to a certain client. Ideal for engaging new prospects, maybe ones on a free trial for your own product, or for upselling clients based on their activity on your own site or their engagement with your own products. Also ideal for onboarding and tutorials/training emails. It's perfect if you want your email series to change dynamically based on customer engagement: for example, let's say you get a new client and want them to complete 3 key steps to register with you. If they take Step 1, but not Step 2 and 3, you don't want to email them asking to do Step 1. So Customer.io would automatically skip your "Step 1 Email" and move on to Step 2 and 3. It's also excellent for A/B testing, so you can optimize whatever you're using it for.
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Feature Rating Comparison

Email & Online Marketing

250ok Inbox
8.6
Customer.io
9.2
A/B testing
250ok Inbox
8.0
Customer.io
9.0
Mobile optimization
250ok Inbox
10.0
Customer.io
10.0
Email deliverability
250ok Inbox
9.5
Customer.io
10.0
List management
250ok Inbox
7.0
Customer.io
10.0
WYSIWYG email editor
250ok Inbox
Customer.io
9.0
Dynamic content
250ok Inbox
Customer.io
8.0
Ability to test dynamic content
250ok Inbox
Customer.io
8.0
Triggered drip sequences
250ok Inbox
Customer.io
10.0

Reporting & Analytics

250ok Inbox
8.7
Customer.io
8.2
Dashboards
250ok Inbox
9.0
Customer.io
8.6
Standard reports
250ok Inbox
8.5
Customer.io
8.8
Custom reports
250ok Inbox
8.5
Customer.io
7.0

Pros

  • Use of recipients' engagement data to display campaign performance instead of panel data.
  • Easy to use interface.
  • Access to spam trap network and granular reports in real time.
  • Blacklist monitoring in real time.
  • Multi-point compliance checks.
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  • Drip emails
  • Analytics and reporting
  • Integrations and API access
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Cons

  • Documentation website could use some improvement (i.e. Search on the API Guide page, videos in the User Guide).
  • Can't copy/paste certain things from the UI (i.e. IP ranges).
  • Doesn't integrate directly with some ESPs although it's easy to just use new seed lists.
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  • HTML editor
  • Integrations
  • Mobile app
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Alternatives Considered

We use both 250ok and ReturnPath in the company (because we're an ESP) and both have their own pros and cons. Return Path uses panel data while 250ok uses recipients' engagement date for reporting. Both ways have pros and cons but you can't say one is better than the other. They're just different. ReturnPath also offers certification which (I have to be honest) is not as relevant anymore as there is only one way to fix deliverability issues nowadays - by following bulk sender guidelines posted by Gmail, Yahoo, AOL, Microsoft, and other ISPs. ReturnPath has a better documentation website while 250ok could use some refinement. With 250ok you can choose the tools you need and build your own package and save money. With ReturnPath - not so much. 250ok also has partners across the globe while ReturnPath mostly promotes its own services and consultants.
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I think Customer.io is a unique product. Most of the other email marketing products you'll find are more B2B focused and don't provide a good solution for high volume emails at a low price. If you're a B2C company, I can't think of any email product I'd rather use than Customer.io
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Return on Investment

  • Easy real-time inbox placement and deliverability monitoring for IPs and domains.
  • Proactive problem resolution to avoid potential issues.
  • Great addition to other deliverability tools to get the full picture on performance.
  • Easy to partner with and to get trained.
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  • Saved time
  • Customer communication
  • Returning customers
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Pricing Details

250ok Inbox

General
Free Trial
Free/Freemium Version
Premium Consulting/Integration Services
Entry-level set up fee?
No
250ok Inbox Editions & Modules
250ok Inbox
Additional Pricing Details

Customer.io

General
Free Trial
Yes
Free/Freemium Version
Premium Consulting/Integration Services
Entry-level set up fee?
No
Customer.io Editions & Modules
Customer.io
Edition
Small Business
$2501
Startup
$7501
Enterprise
$1,2501
Broadcast
$2,5001
1. month
Additional Pricing Details
Every edition includes free messages and profiles. Small Business: 50,000 profiles / 100,000 free messages per month Startup: 250,000 profiles / 500,000 free messages per month Enterprise: 500,000 profiles / 1,000,000 free messages per month Broadcast: 1,000,000 profiles / 5,000,000 free messages per month