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Customer.io: what they publish

customer.io · Email marketing · checked 2026-10-10

78/100BBand B

Rank 2 of 33 in Email marketing, where the median is 22.

Public transparency score, not a product or security rating. Latest check: 2026-10-10. How the score works.

Evidence at a glance

Choose a check to see its source, date and scope.

Not found means not found at the addresses we checked. Not measured means we could not complete the check.

Start a vendor reviewDownload evidence (CSV)

Overview

5 days since the newest dated result, 5 since the oldest. 12 of 12 criteria have a measured result in the last 30 days. Failed checks and undated results are excluded.

Evidence freshness is a statement about our measurement and is kept apart from the transparency score, which is frozen at v1. How good our own measurement is.

Transparency labelsaas-ranking.com

Customer.io

customer.io · Email marketing

  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
B 78of 100 Rank 2 of 33

Published commitments7 of 9 found

Measured behaviour1 of 3 found

Checked 2026-10-10. Every line links the page we found it on. A cross means we found nothing at the addresses we checked, not that the vendor has no such document. A transparency score, not a product rating.

Downloads include all checks, source URLs, dates and the snapshot ID for your procurement file. We do not issue badges.

The label is the whole measurement in one object: every criterion with its weight, the band, and the date. Public transparency score, not a product or security rating.

Every line in it links the page we found the result on, or lists the addresses we checked. A cross means we found nothing there, not that Customer.io has no such document.

Where Customer.io sits in Email marketing

  1. A0 0%
  2. B4 12%
  3. C4 12%
  4. D5 15%
  5. E3 9%
  6. F17 52%
33 vendors with a score; 4 more without a score because we could measure too little. Bands have fixed thresholds, see how the score works.

The band of Customer.io is marked. Vendors without a score are the ones where we could measure too few criteria to rank them – a gap on our side, counted separately.

What Customer.io states

The exact figures and names we read off the pages linked below, with the sentence they stand in. This is what they publish, not what we verified about their systems.

Gaps, heaviest first

✗weight 2 of 3

Third-party requests seen on the first load, before any interaction.

Checked 1 address on 2026-10-10.

Show the 1 address we checked
  1. https://customer.io/ – third-party requests before any interaction: cdn.sanity.io, consent.cookiebot.com, consentcdn.cookiebot.com, consumer.cloud.gist.build, pagead2.googlesyndication.com, region1.google-analytics.com, www.googletagmanager.com

Is this wrong? Send us the URL

Across the market: No third-party tracking before consent in Email marketing: 2 of 34 companies

✗

Uptime SLA with a figure

weight 1 of 3

No uptime figure found.

Checked 6 addresses on 2026-10-10.

Show the 6 addresses we checked
  1. https://customer.io/legal/sla – reached, no match (HTTP 404)
  2. https://customer.io/sla – reached, no match (HTTP 404)
  3. https://customer.io/legal/service-level-agreement – reached, no match (HTTP 404)
  4. https://customer.io/trust/sla – reached, no match (HTTP 404)
  5. https://customer.io/uptime – reached, no match (HTTP 404)
  6. https://customer.io/legal/uptime-sla – reached, no match (HTTP 404)

Is this wrong? Send us the URL

Across the market: Uptime SLA with a figure in Email marketing: 2 of 33 companies

✗

security.txt (RFC 9116)

weight 1 of 3

No security.txt found.

Checked 1 address on 2026-10-10.

Show the 1 address we checked
  1. https://customer.io/.well-known/security.txt – reached, no match (HTTP 404)

Is this wrong? Send us the URL

Across the market: security.txt (RFC 9116) in Email marketing: 6 of 32 companies

✗

Named privacy contact (DPO or privacy address)

weight 1 of 3

No named privacy contact found.

Checked 7 addresses on 2026-10-10.

Show the 7 addresses we checked
  1. https://customer.io/legal/privacy – reached, no match (HTTP 404)
  2. https://customer.io/privacy – reached, no match (HTTP 404)
  3. https://customer.io/privacy-policy – reached, no match (HTTP 404)
  4. https://customer.io/legal/privacy-policy – reached, no match (HTTP 200)
  5. https://customer.io/legal/privacy-notice – reached, no match (HTTP 404)
  6. https://customer.io/trust/privacy – reached, no match (HTTP 404)
  7. https://customer.io/datenschutz – reached, no match (HTTP 404)

Is this wrong? Send us the URL

Across the market: Named privacy contact in Email marketing: 14 of 33 companies

Evidence

The full source lists sit behind these two groups, so that the answer above stays readable.

Published, with a source 8
✓

Data processing agreement (DPA)

weight 3 of 3

Published and readable without a login.

Source: https://customer.io/legal/dpa · checked 2026-10-10

Across the market: Data processing agreement in Email marketing: 14 of 34 companies

✓

Subprocessors: the published list

weight 3 of 3

The actual list is published, not just a promise to keep one.

Source: https://customer.io/legal/sub-processors · checked 2026-10-10

Across the market: Subprocessor list in Email marketing: 6 of 34 companies

✓

Data location: where they say data is hosted

weight 3 of 3

The hosting location is stated on a public page.

  • Locations named next to the hosting wording United States. This does not establish the company’s headquarters.
    Show the exact wording

    Information we collect may be transferred to, and stored, and processed in, the United States or any other country in which we or our affiliates or subcontractors maintain facilities, as descri

    Read at https://customer.io/legal/privacy-policy

Source: https://customer.io/legal/privacy-policy · checked 2026-10-10

Across the market: Data location stated in Email marketing: 11 of 33 companies

✓

Status page with incident history

weight 2 of 3

A public status page with incident history.

Source: https://status.customerio.com/ · checked 2026-10-10

Across the market: Status page with history in Email marketing: 13 of 34 companies

✓

Public pricing with figures

weight 2 of 3

Actual numbers on a public page.

Source: https://customer.io/pricing · checked 2026-10-10

Across the market: Public pricing in Email marketing: 25 of 33 companies

✓

HTTPS enforced with HSTS

weight 2 of 3

HTTP redirects to HTTPS and the HSTS header is set.

  • HSTS max-age 63072000 seconds (730 days).
    Show the exact wording

    max-age=63072000

    Read at https://customer.io/

Source: https://customer.io/ · checked 2026-10-10

Across the market: HTTPS enforced with HSTS in Email marketing: 19 of 35 companies

✓

Notice before subprocessors change

weight 2 of 3

The vendor commits publicly to giving notice before the list changes.

Source: https://customer.io/legal/dpa · checked 2026-10-10

Across the market: Notice before subprocessors change in Email marketing: 10 of 33 companies

✓

Certifications named (SOC 2, ISO 27001)

weight 1 of 3

SOC 2 or ISO 27001 named on a public page.

  • Named on that page HIPAA (named without a certification claim), ISO/IEC 27001 (not counted: the sentence does not carry it), SOC 2 Type II (named without a certification claim). The sentence we kept does not carry this finding on its own, so it counts in no list and no figure.
    Show the 3 exact wordings

    Our platform is HIPAA compliant and SOC 2 Type II certified.

    Read at https://customer.io/security

    What is your ISO 27001 compliance status?

    Read at https://customer.io/security

    Our platform is HIPAA compliant and SOC 2 Type II certified.

    Read at https://customer.io/security

Source: https://customer.io/security · checked 2026-10-10

Across the market: Certifications named in Email marketing: 8 of 34 companies

History

Not enough completed runs yet to draw a line. The next runs fill this in.

Prepare your vendor review

A source is a starting point. Check the product, plan, legal entity and date before treating it as evidence for your purchase. These questions do not change the transparency score.

Customer.io

8 found · 4 not found · 0 not measured across 12 public checks.

12 of 12 criteria have a measured result from the last 30 days. Oldest dated result: 2026-10-10.

Investigate 4 open evidence questions
  1. Uptime SLA with a figure

    Which availability commitment applies to our plan? Please include the measurement window, exclusions and credit claim process.

    Inspect this check
  2. No third-party tracking before consent

    Which third-party requests occur before a visitor makes a choice, and for what purpose? Please distinguish the public website from the product.

    Inspect this check
  3. security.txt (RFC 9116)

    Where should we report a vulnerability, and what acknowledgement and follow-up process should we expect?

    Inspect this check
  4. Named privacy contact

    Which privacy contact handles requests for our account, and what escalation path should we use?

    Inspect this check

Compare

A shortlist holds up to six vendors across categories and lives entirely in the address of its page: share the link, bookmark it, put it in a ticket. Nothing is stored, so we do not know it exists.