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Marketing · head to head

Customer.io vs Google Optimize

Customer.io logo

Customer.io

Marketing

Data-driven messaging for teams getting started, scaling and beyond

From
$15/month
Rated
-
Full reviewWebsite
Google Optimize logo

Google Optimize

Marketing

A/B testing for Google Analytics

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Google Optimize has a free tier, so it costs nothing to try first.
  • Each has a real cost: Customer.io essentials plan caps at 5,000 profiles (people and objects) and 1,000,000 monthly emails, with overages billed at $0.12 per 1,000 emails beyond that; Google Optimize google Optimize and Optimize 360 were sunset and are no longer available as of September 30, 2023
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Customer.io and Google Optimize actually diverge.

Attributes where Customer.io and Google Optimize differ
AttributeCustomer.ioGoogle Optimize
Starting price$15/monthFree
Pricing modelsubscriptionfreemium
Free tierNoYes
FoundedUnknown1998

Identical on both: platforms (Web), user rating (Not yet rated), category (Marketing).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Customer.io

Nothing recorded that Google Optimize does not also cover.

Only in Google Optimize

  • A/B testing
  • Google Analytics integration
  • Visual editor
  • Real-time analytics
  • Google Analytics
  • Google Tag Manager
  • Google's security
  • Cloud deployment

What people use each for

The jobs each tool is most often brought in to do.

Customer.io

  • Orchestrating multi-channel customer journeys from signup to retentionnot Google Optimize
  • Personalizing email and SMS campaigns using customer profilesnot Google Optimize
  • Triggering automated messages based on user behaviornot Google Optimize
  • Coordinating cross-team messaging without rebuilding campaignsnot Google Optimize

Google Optimize

  • A/B and multivariate testing of web pages tied to Google Analytics goalsnot Customer.io
  • Personalising page content for defined audience segmentsnot Customer.io
  • Redirect tests between alternative landing page URLsnot Customer.io

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Customer.io

  • Essentials plan caps at 5,000 profiles (people and objects) and 1,000,000 monthly emails, with overages billed at $0.12 per 1,000 emails beyond that
  • Standard and Premium tiers show custom pricing only, and Enterprise is negotiated rate, so three of the four published tiers require a sales conversation
  • Monthly plans accept credit card only; annual billing via invoice (ACH/wire) requires the annual commitment

Google Optimize

  • Google Optimize and Optimize 360 were sunset and are no longer available as of September 30, 2023
  • Any experiments and personalizations still running on that date were ended by Google
  • Google directs former users to third-party A/B testing tools, naming AB Tasty, Optimizely and VWO, rather than a replacement Google product

Pricing, plan by plan

Customer.io

$15/month
  • Essentials$15/month
    • Base profiles starting at 5,000
    • Email sends: 1 million monthly
    • Community and email support
  • Standard$null/month
    • Mid-tier scaling across channels
    • Higher profile and email allowances
    • Email and priority support
  • Premium$null/month
    • Advanced custom workflows
    • Dedicated support
  • Enterprise$null/month
    • Custom pricing for dedicated infrastructure
    • HIPAA compliance
    • Dedicated hardware

Google Optimize

Free
  • FreeFree
    • A/B testing
    • Google Analytics integration
    • Visual editor

Which should you pick?

Choose Customer.io if

Nothing in the data separates Customer.io from Google Optimize on the points above - pick on price and on how each one feels to use.

Customer.io review

Choose Google Optimize if

  • You need a/b testing.
  • You want to start without paying.
  • You also want google analytics integration.
Google Optimize review

Questions people ask

Is Customer.io or Google Optimize better?
Neither clearly leads. Customer.io starts at $15/month and Google Optimize at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Customer.io or Google Optimize?
Google Optimize has a free tier; the other does not. Paid plans start at $15/month for Customer.io and Free for Google Optimize.
Does Customer.io or Google Optimize run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Google Optimize for free?
Yes. Google Optimize has a free tier, so you can try it without paying. Customer.io starts at $15/month.
What is Customer.io best used for?
Customer.io is most often used for orchestrating multi-channel customer journeys from signup to retention, personalizing email and sms campaigns using customer profiles, triggering automated messages based on user behavior, coordinating cross-team messaging without rebuilding campaigns. Of those, orchestrating multi-channel customer journeys from signup to retention and personalizing email and sms campaigns using customer profiles are not what Google Optimize is typically brought in for.
What can Customer.io do that Google Optimize cannot?
Google Optimize covers A/B testing, Google Analytics integration, Visual editor, Real-time analytics.

Answered from the vendors’ own pages

Customer.io: How much does Customer.io Essentials cost?

Customer.io Essentials starts at $15/month and includes 5,000 base profiles with 1 million monthly email sends, community and email support, and data-driven messaging tools. Customers can choose monthly or annual billing.

Source
Google Optimize: Is Google Optimize still available?

No. Google Optimize and Optimize 360 were discontinued as of September 30, 2023. Google recommends third-party A/B testing integrations such as AB Tasty, Optimizely, and VWO as replacements.

Source
Customer.io: What are Customer.io's usage-based add-on costs?

Beyond plan limits, Customer.io charges $0.009 per additional profile, $0.12 per 1,000 additional emails, and $10 per 100K AI credits. Messages exceeding plan limits are charged at nominal rates. Billing occurs on the subscription anniversary.

Source
Customer.io: Does Customer.io offer a startup discount?

Yes, early-stage companies that have raised under $10 million qualify for a full year free through Customer.io's Startup Program with annual billing.

Source
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