Apollo.io and Seamless.AI both come up when people look for a way to find prospects and reach them. Here is how they compare on price, data, sending, channels and AI, using facts from each vendor’s own site, last checked October 1, 2026.
Short answer. Apollo.io is best for sales teams that want a contact database, sequences and a dialer in one per-seat platform. Seamless.AI is best for sales teams that want a large contact search engine with dialing and are comfortable getting a custom quote.
At a glance
Pricing
| Apollo.io | Seamless.AI | |
|---|---|---|
| Starting price | Free plan, then from $65/seat/month | Free plan; paid plans by quote |
| Free plan | Yes. $0 with 75 credits per seat per month (900 per year), 2 sequences, 250 emails per day, Gmail mailboxes only; stays free with no time limit. | Yes. Free for up to 50 credits. |
| Trial | 14-day trial on Basic and Professional; the trial includes 75 credits and access to most features of the selected plan. | Not listed on its site |
| Plans | Free: $0 ($0) · 75 credits per seat per month (900 per year), 2 sequences per team, 1 mailbox per user, 250 daily email sends, AI writing 5,000 words per month, Gmail only, API access Basic: $65/seat/month (monthly billing) ($49/seat/month billed annually) · 2,500 credits per seat per month (30,000 per year on annual billing), unlimited sequences, 1 mailbox per user, 250 daily email sends, deliverability suite and email warmup, domain and mailbox purchasing, CRM integrations, US dialer (credits apply), AI writing 250,000 words per month Professional: $99/seat/month (monthly billing) ($79/seat/month billed annually) · 4,000 credits per seat per month (48,000 per year on annual billing), unlimited sequences and A/Z testing, unlimited Google and Microsoft mailboxes + 5 SMTP mailboxes per user, unlimited daily sends, AI agents, AI lead scoring, call recordings and AI insights (4,000 mins), AI writing 800,000 words per month Organization: Annual only (the monthly view shows $149/seat/month marked 'Annual Only') ($119/seat/month billed annually, minimum 3 seats) · 6,000 credits per seat per month (72,000 per year), unlimited Google and Microsoft mailboxes + 15 SMTP mailboxes per user, SSO, custom reports, use your own LLM API key, AI writing 1,000,000 words per month | Free: $0 · Up to 50 credits (homepage: 'Seamless.AI is free for up to 50 credits') Paid plans: custom · Prices not published; the pricing page asks how many contacts you need per month and offers custom pricing for unlimited users, bulk credits, prospector, job changes, buyer intent and enrichment |
Features side by side
| Apollo.io | Seamless.AI | |
|---|---|---|
| Lead data | Built-in database; homepage states access to 240M contacts and 30M companies. Email = 1 credit, phone number = 8 credits. Pricing table also lists Google Maps Business Search. | Homepage states 1.8B+ verified business emails and 414M+ phone numbers, found by a real-time search engine; 100% credit-back guarantee for invalid emails. |
| Warm-up | Deliverability Suite and Email Warmup on paid plans (Basic and up); homepage mentions domain warming, inbox rotation and reputation monitoring. | Emailing page says you can connect your email and warm your inbox safely. |
| Sending inboxes | 1 mailbox per user on Free and Basic; unlimited Google and Microsoft mailboxes + 5 SMTP per user on Professional, + 15 SMTP on Organization. Domain and mailbox purchasing on paid plans. | Not listed on its site |
| Sales engagement page lists multi-channel sequence steps across email, call and networking platforms; FAQ says Apollo integrates with LinkedIn. No LinkedIn automation details stated. | Chrome extension pulls contact data on LinkedIn; Pitch Intelligence drafts personalized DMs and comments. No LinkedIn automation described. | |
| Calls, SMS, WhatsApp | US dialer on paid plans (1 credit per 30 seconds); Advanced Dialer add-on $119/team/month billed annually ($149 billed monthly) with international, parallel and power dialer and local presence. SMS and WhatsApp not mentioned. | Calling (Seamless Connect): click-to-call, power and parallel dialing, voicemail drops, local presence, call recording; available on specific plans or as add-ons, telephony usage typically extra. SMS and WhatsApp not mentioned. |
| AI writing | AI writing with monthly word allowances (5,000 to 1,000,000 words by plan); AI Assistant builds sequence steps and copy. | AI-powered writing and templates for emails; Pitch Intelligence; AI Assistant and AI agents. |
| Replies / inbox | Unified Inbox listed; homepage says agents research, build lists, write outreach, follow up and book meetings. AI reply handling not specifically described. | Not listed on its site |
| CRM | Salesforce, HubSpot, Pipedrive (paid plans); Outreach, SalesLoft, SendGrid, Mailgun, Slack, LLM integrations (MCP); homepage claims 200+ integrations. | Salesforce, HubSpot, Microsoft Dynamics, Zoho, Keap, Pipedrive, Insightly, Close, Copper, Cloze, Sugar, Freshsales; access depends on plan and usage may consume credits. |
| API | API access listed on Free, API enrichment on paid plans, 'All other APIs' on higher tiers. FAQ says advanced or custom integrations via API are available on Custom plans. | API offered for automation, enrichment and campaigns; MCP and Claude / ChatGPT integrations listed. |
| Agencies | Not listed on its site | Not listed on its site |
Facts from each vendor’s own pricing and product pages, last checked October 1, 2026: Apollo.io, Seamless.AI. Prices change often, so check before you buy.
Where Apollo.io stands out
- Large built-in contact database (240M contacts, 30M companies stated) combined with sequencing in one tool
- Permanent free plan with credits, 2 sequences and API access
- Built-in dialer, call recording and meeting tools on paid plans
- Email warmup, deliverability suite and domain and mailbox purchasing included from Basic
- Integrations with Salesforce, HubSpot and Pipedrive plus MCP for LLMs
Limitations
- Priced per seat; the Organization plan requires a minimum of 3 seats and is annual only
- Unused credits expire each billing cycle and do not roll over
- Free and Basic plans are limited to 1 mailbox per user and 250 daily email sends
- Phone numbers cost 8 credits each and dialer minutes consume credits
Where Seamless.AI stands out
- Very large stated data coverage (1.8B+ emails, 414M+ phone numbers)
- Free account with 50 credits
- Credit-back guarantee for invalid emails
- Long list of native CRM integrations
- Calling, emailing, buyer intent and job change tracking in one platform
Limitations
- No prices published; paid plans require a quote
- Calling features are plan-specific or add-ons and telephony minutes typically cost extra
- Integration access depends on plan and usage can consume credits
- No LinkedIn automation, SMS or WhatsApp mentioned
And if you don’t have a list yet?
Both tools expect you to decide who to contact. If you sell to small or local businesses, or you want the targeting and the writing done for you, LeadGen.tools reads your website, finds the companies and the person who decides at each one, and writes a different email for every prospect. Free plan, no card.
FAQ
Is Apollo.io cheaper than Seamless.AI?
By listed starting price: Apollo.io free plan, then from $65/seat/month, Seamless.AI free plan; paid plans by quote. Limits per plan differ, so compare what each plan includes.
Does Apollo.io or Seamless.AI have a free plan?
Apollo.io: Yes. $0 with 75 credits per seat per month (900 per year), 2 sequences, 250 emails per day, Gmail mailboxes only; stays free with no time limit.. Seamless.AI: Yes. Free for up to 50 credits..
What is the main difference between Apollo.io and Seamless.AI?
They differ most on: sending inboxes, replies / inbox. Apollo.io is best for sales teams that want a contact database, sequences and a dialer in one per-seat platform. Seamless.AI is best for sales teams that want a large contact search engine with dialing and are comfortable getting a custom quote.
Related comparisons
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