Customer.ioCustomer Engagement Platform For Better Outcomes
vs
MailjetDesign, deliver, and automate marketing and transactional emails together
Comparison · Email Marketing · weekly run Nov 2
Customer.io vs Mailjet
Which one do AI engines recommend, and how do they differ on price, fit and features?
The short answer
Customer.io is the stronger AI pick in Email Marketing: it has a visibility score of 6.2 versus 3.8 for Mailjet, and ranks ahead in 100% of the answers that name both.
Choose Customer.io if…
- You want the brand AI engines rank higher (6.2 vs 3.8)
- AI answers describe it more positively (34% vs 0% positive)
- You need SOC 2 Type II coverage
- You prefer a larger, established vendor (201–500 employees)
Choose Mailjet if…
- You want a free plan to start
- You need ISO 27701 or SOC 2 or PCI DSS or CSA STAR Level 1 or Certified Senders Alliance coverage
- Flat tiers pricing suits your budget better than usage-based
- straightforward annual pricing discount
AI visibility side by side
Latest weekly run · Nov 2
| Metric | Customer.io | Mailjet |
|---|---|---|
| Visibility score | 6.2% | 3.8% |
| Change vs last week | New | New |
| Rank in Email Marketing | #16 | #19 |
| Share of voice | 1.7% | 1.7% |
| Mentions this run | 10 | 9 |
| Positive in AI answers | 34% | 0% |
The stronger value in each row is marked with a ✓.
Visibility score trend
Weekly runs over the last 60 days
Customer.io 0pp · Mailjet 0pp over 0 weekly runs.
Engine by engine
Customer.io leads on 2 of 3 engines
ChatGPT
AI Mode
Perplexity
Customer.ioMailjet
Head to head in AI answers
2 engine answers name both brands
2Customer.io ranked higher
0Mailjet ranked higher
| Prompt | Engine | Customer.io | Mailjet |
|---|---|---|---|
| Best email marketing platform for startups | Perplexity | #5 | #9 |
| Official website of the top email marketing platform vendors | ChatGPT | #18 | #22 |
Features, pricing & fit
| Dimension | Customer.io | Mailjet |
|---|---|---|
| Pricing model | Usage-based | Flat tiers |
| Entry price | $100 / mo | Free; paid from $9 / mo |
| Free plan | No | Yes |
| Deployment | Cloud-hosted, with US and EU data centers | Cloud-hosted in EU data centers |
| Integrations | — | 100+ |
| Compliance | GDPR, CCPA, ISO 27001, SOC 2 Type II, HIPAA | ISO 27001, ISO 27701, SOC 2, GDPR, CCPA, PCI DSS, CSA STAR Level 1, HIPAA, Certified Senders Alliance |
| Support | Email and chat support, Documentation and community support, Dedicated Customer Success Manager on Enterprise | Online support, Priority support (Premium plan), Phone and chat support (from 50k plan), Dedicated Technical Account Manager (Custom plan) |
| Founded | 2012 | 2010 |
| Headquarters | Portland, Oregon, USA | Paris, France |
| Employees | 201–500 | 51–200 |
| Funding | Series A led by Spectrum Equity | Series Unknown (investment by Entrepreneur Venture, amount undisclosed) |
| Best for | Teams getting started with data-driven messaging, and teams scaling across channels with custom workflows. | Marketing and development teams that want marketing and transactional email on one platform |
Plans side by side
Customer.io
Essentials$100month, billed monthly (starts at, 5k profiles)
Premium$1,000month, billed yearly (starts at)
EnterpriseCustomcontact sales
Mailjet
Free$0month
Starter$9month (8,000 emails/month)
Essential$19month (15,000 emails/month)
Premium$29month (15,000 emails/month)
CustomCustomcustom quote
Pros and cons
Themes from the AI answers that mention each brand
Customer.io
- Strong behavioral and event-driven automation
- Well suited to product-led SaaS companies
- Supports onboarding, activation and retention messaging
- Frequently shortlisted as a top marketing automation choice
Mailjet
- straightforward annual pricing discount
Data collected ·ChatGPT, Perplexity, Google AI Mode·coverage 100%·next run
Cite as: SlateIndex, “Customer.io vs Mailjet”, https://slateindex.ai/compare/customer-io-vs-mailjet, data of Nov 2, 2026. Licence: CC BY 4.0.