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Marketing · head to head

Customer.io vs SurveyCTO

Customer.io logo

Customer.io

Marketing

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

From
$15/month
Free plan
No
Full reviewWebsite
SurveyCTO logo

SurveyCTO

Surveys

Offline field survey platform priced by submissions rather than seats, built for research data quality

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only SurveyCTO 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; SurveyCTO pricing is by submission volume, forms and storage rather than by users, so a small team running continuous high-volume collection can pay more than a 200-person survey team that runs for six weeks
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Customer.io and SurveyCTO actually diverge.

Attributes where Customer.io and SurveyCTO differ
AttributeCustomer.ioSurveyCTO
Starting price$15/monthFree
Pricing modelsubscriptionPer month by submission volume
Free tierNoYes
PlatformsWebWeb, Android, iOS
CategoryMarketingSurveys

Identical on both: user rating (Not yet rated).

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 SurveyCTO does not also cover.

Only in SurveyCTO

  • Offline collection
  • XLSForm authoring
  • Automated quality checks
  • Audio auditing
  • Case management
  • Random assignment
  • Server region selection

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 SurveyCTO
  • Personalizing email and SMS campaigns using customer profilesnot SurveyCTO
  • Triggering automated messages based on user behaviornot SurveyCTO
  • Coordinating cross-team messaging without rebuilding campaignsnot SurveyCTO

SurveyCTO

  • A household survey with 200 enumerators across a country where paying per seat would cost more than the fieldworknot Customer.io
  • An impact evaluation that needs audio auditing and timing metadata to prove interviews were conducted as reportednot Customer.io
  • A panel study revisiting the same households annually and needing offline case assignment to find them againnot Customer.io
  • A statistics unit that must keep data inside a specific region and produce a SOC 2 report for its fundernot 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

SurveyCTO

  • Pricing is by submission volume, forms and storage rather than by users, so a small team running continuous high-volume collection can pay more than a 200-person survey team that runs for six weeks
  • Forms are authored in XLSForm spreadsheet syntax, which is precise and versionable but has a real learning curve, and organisations without someone comfortable in it stall at form design
  • Overage is charged at 100 US dollars per 1,000 extra submissions, which is easy to trigger on the Basic tier at 5,000 a month and produces surprise invoices during an active field round
  • Server region selection only appears on the Pro tier and a custom GDPR data processing agreement only on Advanced, so European data protection requirements push the price to at least 315 and often 630 dollars a month regardless of volume
  • It is built for structured research fieldwork, not for business process forms, so it has no dispatch, no invoicing and no formatted document output, and a field service business would be buying the wrong tool

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

SurveyCTO

Free
  • CommunityFree
    • Permanent free subscription for testing and training
    • 10 forms
    • 200 monthly submissions
  • Basic$225/month
    • Billed annually, 250 USD month to month
    • 100 forms
    • 10 GB storage
  • Pro$315/month
    • Billed annually, 350 USD month to month
    • 500 forms
    • 25 GB storage
  • Advanced$630/month
    • Billed annually, 700 USD month to month
    • Unlimited forms, storage and submissions
    • Advanced offline case management

Which should you pick?

Choose Customer.io if

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

Customer.io review

Choose SurveyCTO if

  • You need offline collection.
  • You want to start without paying.
  • You work on Web, Android, iOS.
  • You also want xlsform authoring.
SurveyCTO review

Questions people ask

Is Customer.io or SurveyCTO better?
Neither clearly leads. Customer.io starts at $15/month and SurveyCTO at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Customer.io or SurveyCTO?
SurveyCTO has a free tier; the other does not. Paid plans start at $15/month for Customer.io and Free for SurveyCTO.
Does Customer.io or SurveyCTO run on more platforms?
Customer.io runs on Web. SurveyCTO runs on Web, Android, iOS.
Can I use SurveyCTO for free?
Yes. SurveyCTO 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 SurveyCTO is typically brought in for.
What can Customer.io do that SurveyCTO cannot?
SurveyCTO covers Offline collection, XLSForm authoring, Automated quality checks, Audio auditing.

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
SurveyCTO: Do I pay per enumerator?

No. Users and devices are unlimited on every paid tier. You pay for monthly submissions, forms and storage.

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
SurveyCTO: Is there a free version?

Yes, a permanent community subscription with 10 forms, 200 monthly submissions and 200 MB of storage, intended for testing and training rather than production.

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
SurveyCTO: What happens if I exceed my submissions?

Extra credits are 100 US dollars per 1,000, with discounts of 20 per cent or more at volume. Plan the tier around your peak field month, not your average.

SurveyCTO: Can I choose where the data is stored?

Only on Pro and above. If data residency matters, budget for at least the Pro tier.

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