B2B contact database plus sales engagement and AI prospecting platform.
Hunter.io vs Seamless.AI
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Summary
Hunter.io is best for finding and verifying professional email addresses, with simple cold email campaigns, while Seamless.AI is best for sales reps who mainly need verified emails and mobile numbers for prospecting. Only Seamless.AI offers dialer / calling. Both Hunter.io and Seamless.AI offer a free plan, so you can try each before paying.
Which should you choose?
Choose Hunter.io if…
- You need finding and verifying professional email addresses, with simple cold email campaigns
- You're one of: marketers and link builders, recruiters, sdrs running low-volume targeted outreach
- Accurate email finding and verification
Choose Seamless.AI if…
- You need sales reps who mainly need verified emails and mobile numbers for prospecting
- Dialer / calling matters to you
- You're one of: sdrs doing phone prospecting, recruiters, sales teams needing contact enrichment
- Large database with many mobile numbers
At a glance
| Hunter.io | Seamless.AI | |
|---|---|---|
| Best for | Finding and verifying professional email addresses, with simple cold email campaigns | Sales reps who mainly need verified emails and mobile numbers for prospecting |
| Free plan | Yes | Yes |
| Starting price | From $34/mo | From $147/mo |
| Learning curve | Low | Low |
| Platforms | Web, Chrome extension, API | Web, Chrome extension, API |
| Ideal for | Marketers and link builders, Recruiters, SDRs running low-volume targeted outreach | SDRs doing phone prospecting, Recruiters, Sales teams needing contact enrichment |
Feature comparison
| Hunter.io | Seamless.AI | |
|---|---|---|
| B2B contact database | Yes | 1.3B+ contacts |
| Email sequences | Yes | Limited |
| Email warm-up | No | — |
| Unlimited sending accounts | No | — |
| LinkedIn steps | No | Chrome extension (prospecting only) |
| Built-in CRM | Lead lists only | No |
| AI personalization | Yes | Yes |
| Dialer / calling | No | Yes |
| Email verification | Yes | Yes |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| Hunter.io | Seamless.AI | |
|---|---|---|
| Business / enterprise plan | — | Yes |
| SSO (SAML / OIDC) | — | Yes |
| SCIM user provisioning | — | — |
| SOC 2 | — | Type II |
| ISO 27001 | — | No |
| HIPAA (BAA available) | — | — |
| GDPR DPA | Yes | — |
| Data residency options | EU (default) | — |
| No training on your data | — | — |
| Audit logs | — | — |
| Admin controls | — | Yes |
| Deployment | Cloud | Cloud |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
Hunter.io
Hunter.io is an email finding and verification tool that searches by domain or person and returns addresses with confidence scores. It also includes a B2B lead database (Discover), lead lists, and Campaigns for sending sequences from Gmail, Outlook or SMTP accounts. It is used by marketers, recruiters, SDRs and link builders.
Key features- Domain Search and Email Finder
- Email Verifier with bulk verification
- Discover B2B lead database with intent signals
- Campaigns with automated follow-ups from connected inboxes
- AI Writing Assistant for cold emails
- Chrome extension and Google Sheets add-on
Seamless.AI
Seamless.AI is a B2B contact data platform that searches for and verifies emails and phone numbers in real time. It includes a Chrome extension for LinkedIn and company sites, Autopilot for background list building, an AI Writer, and an engagement hub for emailing and calling. It is used by SDRs, recruiters and sales teams focused on phone and email prospecting.
Key features- Real-time contact search with verified emails and mobile numbers
- Chrome extension that overlays contact data on LinkedIn and websites
- Autopilot for automated list building
- AI Writer for cold emails and sales copy
- Buyer intent signals and data enrichment
- Connect engagement hub with emailing, calling and tasks
Pricing
Hunter.io
Free plan (50 credits/mo); paid from $34/mo billed yearly ($49 monthly) Starter
Seamless.AI
Free plan (50 lifetime credits); Basic ~$147/mo billed yearly; Pro/Enterprise quote-only
Prices last checked September 2026. Plans change often — confirm on each vendor's site.
Pros and cons
Hunter.io
Strengths- Accurate email finding and verification
- Free plan with monthly credits
- Unlimited team members on all plans
- Simple to learn
- No email warm-up or inbox rotation
- No phone numbers and no LinkedIn steps
- Connected email accounts capped per plan
- Campaign features are basic compared with dedicated senders
Not ideal for: Teams running multichannel or high-volume cold outreach should look at lemlist, Instantly or Smartlead.
Seamless.AI
Strengths- Large database with many mobile numbers
- Chrome extension fits a LinkedIn-first workflow
- Free plan to test data quality
- CRM enrichment keeps records up to date
- Free plan credits are lifetime, not monthly
- Higher tiers are quote-only and require annual contracts
- Outreach features are basic compared with dedicated sequencers
- Data accuracy complaints are common, so bounce rates vary
Not ideal for: Teams that want sequencing and deliverability tools in the same product should look at Apollo.io or lemlist.
Integrations
Hunter.io
Seamless.AI
FAQ
What is the main difference between Hunter.io and Seamless.AI?
Hunter.io is built for finding and verifying professional email addresses, with simple cold email campaigns; Seamless.AI is built for sales reps who mainly need verified emails and mobile numbers for prospecting. Key differences: Seamless.AI offers dialer / calling.
Is Hunter.io or Seamless.AI cheaper?
Hunter.io starts from $34/mo and Seamless.AI starts from $147/mo (as of September 2026). On entry price, Hunter.io is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do Hunter.io and Seamless.AI have free plans?
Both Hunter.io and Seamless.AI offer a free plan, so you can try each before paying.
Which is easier to use, Hunter.io or Seamless.AI?
Both have a low learning curve.
What are good alternatives to Hunter.io and Seamless.AI?
Other sales & outreach tools worth comparing include Apollo.io, Instantly.ai and HubSpot.
