Constant Contact vs Customer.io
Constant Contact vs Customer.io, compared side by side on 19 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Constant Contact is on 52/100 and Customer.io on 67/100.
Where each one leads
Constant Contact
- domain rating: 92/100 against 81/100
- headcount: 1,149 against 514
Customer.io
- our overall score: 67/100 against 52/100
- agent readiness: 75/100 against 44/100
- funding raised: $55.0M against $37.0M
At a glance
| Measure | Constant Contact | Customer.io |
|---|---|---|
| What it is | Digital marketing platform for small businesses and nonprofits, offering email, SMS, social media, and CRM tools. | Customer engagement platform. |
| Category | Digital Marketing, Email Marketing, Marketing Automation, CRM | Customer Engagement Platform, Marketing Automation, MarTech, SaaS |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 1995 | 2012 |
| Headquarters | Waltham, United States | Beaverton, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Constant Contact | Customer.io |
|---|---|---|
| Employees | 1,149 | 514 |
| Total funding | $37.0M | $55.0M |
| Latest round | Post IPO | Series A |
| Valuation | Not published | $746M |
| LinkedIn followers | 44,549 | 41,008 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Constant Contact | Customer.io |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 52/100 | 67/100 |
| Traction | 58/100 | 59/100 |
| Team | 30/100 | 60/100 |
| Community | 8/100 | Not published |
| Search visibility | 45/100 | 55/100 |
| Quality | 58/100 | 78/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (44/100) | B (75/100) |
| Domain ratingLink authority, 0-100 | 92/100 | 81/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Constant Contact | Customer.io |
|---|---|---|
| Hosting | Not detected | Vercel |
| CDN | Cloudflare | Vercel |
| Frameworks | Not detected | Next.js, Tailwind CSS |
| Analytics | Not detected | Google Tag Manager |
Constant Contact vs Customer.io: common questions
Which is better, Constant Contact or Customer.io?
On our 0-100 score Customer.io rates higher (67/100 against 52/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 19 data points above: read the rows that match what you are buying for.
How do Constant Contact and Customer.io compare on the numbers?
Constant Contact leads on domain rating (92/100 against 81/100), headcount (1,149 against 514). Customer.io leads on our overall score (67/100 against 52/100), agent readiness (75/100 against 44/100), funding raised ($55.0M against $37.0M).
Read the full Constant Contact review and pricing or the Customer.io review and pricing. You can also browse other Constant Contact alternatives we track.