Cold email outreach platform with unlimited sending accounts, warmup and B2B lead database.
Apollo.io vs Seamless.AI
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Summary
Apollo.io is best for sales teams that want a B2B contact database and outreach sequences in one platform, while Seamless.AI is best for sales reps who mainly need verified emails and mobile numbers for prospecting. Only Apollo.io offers built-in CRM. Apollo.io has a medium learning curve, compared with low for Seamless.AI. Both Apollo.io and Seamless.AI offer a free plan, so you can try each before paying.
Which should you choose?
Choose Apollo.io if…
- You need sales teams that want a B2B contact database and outreach sequences in one platform
- Built-in CRM matters to you
- You're one of: sdr and bdr teams, startup founders doing outbound, small sales teams without a data vendor
- Database, sequencing and dialer in one tool
Choose Seamless.AI if…
- You need sales reps who mainly need verified emails and mobile numbers for prospecting
- You're one of: sdrs doing phone prospecting, recruiters, sales teams needing contact enrichment
- You want something quicker to learn
- Large database with many mobile numbers
At a glance
| Apollo.io | Seamless.AI | |
|---|---|---|
| Best for | Sales teams that want a B2B contact database and outreach sequences in one platform | Sales reps who mainly need verified emails and mobile numbers for prospecting |
| Free plan | Yes | Yes |
| Starting price | From $49/user/mo | From $147/mo |
| Learning curve | Medium | Low |
| Platforms | Web, Chrome extension, iOS, Android, API | Web, Chrome extension, API |
| Ideal for | SDR and BDR teams, Startup founders doing outbound, Small sales teams without a data vendor | SDRs doing phone prospecting, Recruiters, Sales teams needing contact enrichment |
Feature comparison
| Apollo.io | Seamless.AI | |
|---|---|---|
| B2B contact database | 200M+ contacts | 1.3B+ contacts |
| Email sequences | Yes | Limited |
| Email warm-up | No | — |
| Unlimited sending accounts | No | — |
| LinkedIn steps | Manual task steps | Chrome extension (prospecting only) |
| Built-in CRM | Yes | No |
| AI personalization | Yes | Yes |
| Dialer / calling | Professional plan and above | Yes |
| Email verification | Yes | Yes |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| Apollo.io | Seamless.AI | |
|---|---|---|
| Business / enterprise plan | Yes | Yes |
| SSO (SAML / OIDC) | Organization plan | Yes |
| SCIM user provisioning | — | — |
| SOC 2 | Type II | Type II |
| ISO 27001 | Yes | No |
| HIPAA (BAA available) | — | — |
| GDPR DPA | Yes | — |
| Data residency options | — | — |
| No training on your data | — | — |
| Audit logs | — | — |
| Admin controls | Yes | Yes |
| Deployment | Cloud | Cloud |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
Apollo.io
Apollo.io combines a large B2B contact and company database with multichannel sequences, a dialer, deal tracking and AI research tools. Reps search and filter prospects, enrich records, and run email, call and LinkedIn task steps from the same account. It is widely used by startups, SDR teams and small sales organizations as an all-in-one prospecting tool.
Key features- B2B database of 200M+ contacts with 65+ search filters
- Multichannel sequences with email, call and LinkedIn task steps
- Built-in dialer with recording and local presence (Professional and up)
- AI research, AI email writing and lead scoring
- Deals, pipeline and CRM enrichment
- Chrome extension for LinkedIn and Gmail
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
Apollo.io
Free forever plan; paid from $49/user/mo annual ($59 monthly) Basic
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
Apollo.io
Strengths- Database, sequencing and dialer in one tool
- Useful free plan for light prospecting
- Syncs with Salesforce and HubSpot
- AI research speeds up personalization
- No true email warm-up; its ramp-up only paces sending volume
- Credit limits restrict exports and mobile numbers
- Data accuracy varies by region and industry
- Dialer is limited to Professional plan and above
Not ideal for: Agencies sending high-volume cold email across many domains will get better deliverability tooling from 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
Apollo.io
Seamless.AI
FAQ
What is the main difference between Apollo.io and Seamless.AI?
Apollo.io is built for sales teams that want a B2B contact database and outreach sequences in one platform; Seamless.AI is built for sales reps who mainly need verified emails and mobile numbers for prospecting. Key differences: Apollo.io offers built-in CRM.
Is Apollo.io or Seamless.AI cheaper?
Apollo.io starts from $49/user/mo and Seamless.AI starts from $147/mo (as of September 2026). On entry price, Apollo.io is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do Apollo.io and Seamless.AI have free plans?
Both Apollo.io and Seamless.AI offer a free plan, so you can try each before paying.
Which is easier to use, Apollo.io or Seamless.AI?
Seamless.AI is generally quicker to learn (Apollo.io: medium, Seamless.AI: low learning curve).
What are good alternatives to Apollo.io and Seamless.AI?
Other sales & outreach tools worth comparing include Instantly.ai, HubSpot and lemlist.
