Customer.io vs Klaviyo
Customer.io
Behavioural messaging across email, push and SMS
Publishers using it: 2 · incl. Inc42, CMS Critic
Klaviyo
Data-driven email and SMS with deep segmentation
Publishers using it: 11 · incl. Hachette Book Group, Phaidon Press, Atlas Obscura
Last verified Nov 12, 2026
At a glance
- Customer.io scores 2.4/5 and Klaviyo scores 2.7/5 in Benchmark Grid's independent cross-channel marketing platforms benchmark, both assessed on the same 10 criteria.
- The widest gaps are analytics & attribution (Customer.io 3.0, Klaviyo 3.9) and audience segmentation & identity (Customer.io 3.8, Klaviyo 4.6); they are within 0.3 on 6 of 10 criteria.
- Both are built for small and mid-market publishers.
- On total cost of ownership Customer.io scores 2.7 and Klaviyo 3.5 (higher means better value, not a lower price).
- In our tracking 2 publishers use Customer.io and 11 use Klaviyo.
- Scores last verified 12 Nov 2026. Vendors cannot pay for a score or a position.
Where they differ
Customer.io is stronger on support & Implementation (3.2 vs 2.8).
Klaviyo is stronger on analytics & Attribution (3.9 vs 3.0), audience Segmentation & Identity (4.6 vs 3.8) and personalisation & Content Delivery (3.8 vs 3.2).
Which one fits
Choose Customer.io if…
- You publish at small and mid-market scale.
- You weight support & Implementation heavily — Customer.io leads on it in this benchmark.
Choose Klaviyo if…
- You publish at small and mid-market scale.
- You weight analytics & Attribution, audience Segmentation & Identity and personalisation & Content Delivery heavily — Klaviyo leads on those in this benchmark.
Also weighing these
The nearest-scored tools to Customer.io and Klaviyo in this benchmark, listed A to Z.
- 2.5AcousticIntent-driven marketing automation for B2C brandsRead review
- 2.6IterableCross-channel growth platform for scaling teamsRead review
- 2.6MailchimpAccessible email marketing with journeysRead review
- 2.3OrttoJourneys plus analytics for mid-market teamsRead review
All 11 scored tools are in Best Cross-Channel Marketing Platforms for Publishers.
Who uses them
Publishers we have detected running each tool, from ads.txt, site code and published case studies. Agencies, brands and vendors are excluded.
Head to head
| Criterion | Customer.io | Klaviyo |
|---|---|---|
| Audience Segmentation & Identity14% of capability | 3.8 | 4.6 |
| Cross-Channel Orchestration14% of capability | 4.1 | 4.2 |
| Analytics & Attribution12% of capability | 3.0 | 3.9 |
| Journey Automation & Triggering12% of capability | 4.3 | 4.3 |
| Personalisation & Content Delivery12% of capability | 3.2 | 3.8 |
| Integration & Data Connectivity10% of capability | 4.2 | 4.5 |
| Compliance & Consent Management8% of capability | 2.8 | 3.0 |
| Deliverability & Channel Performance8% of capability | 3.5 | 3.7 |
| Pricing & Scalability6% of capability | 3.0 | 3.2 |
| Support & Implementation4% of capability | 3.2 | 2.8 |
| Capability45% of composite | 3.6 | 4.0 |
| Publisher fit40% of composite | 1.0 | 1.0 |
| Total cost of ownership15% of composite | 2.7 | 3.5 |
Cost of ownership
| Sub-score | Customer.io | Klaviyo |
|---|---|---|
| Pricing transparency | 3.0 | 4.0 |
| Entry cost | 3.0 | 4.5 |
| Implementation cost | 3.5 | 4.0 |
| Hidden-fee risk | 2.5 | 2.5 |
| Ongoing cost | 1.5 | 2.5 |
Customer.io pricing
Usage-based tiers
Klaviyo pricing
Contact-based tiers; free to start
What users say
Customer.io
16 positive · 14 neutral · 6 negative
Klaviyo
19 positive · 49 neutral · 17 negative
Mentions we could not tie to a real user, and those flagged as promotional, are excluded. Sentiment is opinion, and is independent of the verified publisher adoptions above.
Customer.io scores 2.4 and Klaviyo scores 2.7 in Benchmark Grid's independent Best Cross-Channel Marketing Platforms for Publishers benchmark (benchmarkgrid.com/vs/customer-io/klaviyo, verified Nov 12, 2026)
Common questions
How do Customer.io and Klaviyo differ?
Customer.io is stronger on support & Implementation (3.2 vs 2.8). Klaviyo is stronger on analytics & Attribution (3.9 vs 3.0), audience Segmentation & Identity (4.6 vs 3.8) and personalisation & Content Delivery (3.8 vs 3.2). Neither is better in the abstract — which one suits you depends on which of those dimensions carries the most weight in your operation.
Which is cheaper, Customer.io or Klaviyo?
On total cost of ownership — pricing transparency, entry cost, implementation, hidden-fee risk and ongoing cost — Customer.io scores 2.7/5 and Klaviyo scores 3.5/5. A higher score means better value, not a lower sticker price.
How are these scores calculated?
Each tool is assessed against its category's published criteria (10 in this benchmark), which make up Capability (45% of the composite), Publisher fit (40%) and Total cost of ownership (15%). Assessment is carried out by SODP's editorial team against a published methodology. Vendors cannot pay for inclusion, scores or positions.
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Both tools are scored in Best Cross-Channel Marketing Platforms for Publishers. See alternatives to Customer.io or alternatives to Klaviyo.
Weighing a third option? Add a tool to this comparison.
Where to next
Four questions, and a scored stack across every benchmark — not just Best Cross-Channel Marketing Platforms for Publishers
Every scored tool in Best Cross-Channel Marketing Platforms for Publishers, with the criteria behind each number
Every category, independently scored
Related comparisons
Other head-to-heads publishers look at in Best Cross-Channel Marketing Platforms for Publishers.
