Apollo.io vs Seamless.AI: pricing, features and which to choose

Apollo.io is a sales intelligence and go-to-market platform made by ZenLeads, Inc., doing business as Apollo.io. Founded in 2015, it released its first product in 2016 and says it reached $150 million in annual recurring revenue in May 2025. Apollo also reports more than 500,000 companies using the platform and more than 50,000 weekly active users in 2025. Its 2023 Series D raised $100 million at a reported $1.6 billion valuation. The product combines a business contact database with prospect search, enrichment, sequencing, calling, pipeline support, analytics, and AI features. That combination places Apollo closer to a sales operating system than a standalone lead database, serving founders, sales teams, marketers, and revenue operations groups.

Apollo’s workflow usually begins with finding people or companies through filters, then selecting records for enrichment, lists, sequences, or exports. Email campaigns are available on every account. Free users can connect Gmail, while paid users can connect Microsoft Office and other providers. Teams can create sequences, manage pipeline activity, record calls, prepare for conversations, and review AI-generated insights. The AI Assistant accepts natural-language requests, uses Apollo data and saved messaging context, and can find decision-makers, research accounts, build sequences, export lists, and report on performance. Scheduled agents can run some outbound tasks in the background. Permissions still govern available actions, and Apollo advises reviewing generated messages, matches, and credit estimates before execution.

Apollo’s main limitation is pricing and usage complexity: the final amount depends on seats, billing frequency, credits, add-ons, and selected features. Basic includes one mailbox, 250 daily emails, five team workflows, and 1,000 records per selection, while Professional raises several limits and adds AI and call features. Standard plans are for internal business use, so powering external products, sharing data with customers, or reselling it requires a separate agreement. Apollo competes with ZoomInfo, Cognism, Outreach, Salesloft, and HubSpot Sales Hub. It combines data and enrichment more closely than Outreach or Salesloft, and adds execution tools beyond ZoomInfo or Cognism. Choose Apollo if one team needs prospect intelligence, outbound execution, enrichment, and AI actions together.

Seamless.AI is a B2B sales intelligence platform from Seamless Contacts Inc., founded in 2015 and based in Columbus, Ohio. CB Insights lists $3.38 million in total funding. Founder and CEO Brandon Bornancin remains the public face of the company. The business announced a rebrand to Seamless on February 10, 2026, while keeping seamless.ai as its website. Company figures point to rapid expansion: more than 500,000 sales teams in a June 2025 announcement, then more than 1,000,000 in the rebrand announcement. Its 2025 review reported 70 million contact searches and 13 million company searches. Those figures describe company-reported activity, not independently audited customer totals, but they show the product's intended scale and commercial focus clearly.

A normal workflow begins with filters for title, industry, geography, company size, and related company or contact fields. Users can research a person, save the record, enrich an uploaded list, or send contacts into outreach workflows. The product includes a Chrome extension, Job Change Enrich, Buyer Intent, org charts, AI Assistant, Autopilot, AI Campaigns, and CRM connections. Developers use a separate search and research sequence. They authenticate with an API key or OAuth, search contacts or companies, submit selected results for research, then retrieve results through polling or webhooks. The API also offers MCP access for Cursor, Claude, and ChatGPT. That gives technical teams a path to build CRM, warehouse, or agent workflows around the same contact data.

Credit accounting is the main constraint. Search, enrichment, research, AI actions, and automation use overlapping balances, and inaccurate records can still consume credits. Paid prices are not public, and API terms prohibit spam, resale, unauthorized aggregation, sensitive personal information, and unapproved caching. ZoomInfo is stronger for enterprise account intelligence and intent programs, while Seamless offers a free test and a prospecting workflow. Apollo.io presents a more explicit multichannel sequencing model, whereas Seamless emphasizes data discovery and enrichment. Lusha suits smaller contact lookups with fewer automation surfaces. Seamless is the better pick for B2B prospecting and API enrichment when a team can monitor credit use.