Apollo.io vs Seamless.AI (2026)
The decision is whether you buy on a price and a sourcing account you can read, or on a search engine that researches each contact live. Apollo publishes five tiers with real numbers and a free plan, names its three sourcing routes down to the product features that turn a customer's mailbox into inventory, and screens its database against do not call registries inside the product, which is why the GTM Tech Index grades it A on commercial transparency, data licensing, data privacy and outreach compliance. Seamless.AI prices nothing past its free tier, describes its differentiator as research run on request rather than a stored row, and publishes no sourcing statement, while its state privacy policy discloses that personal information may be sold to data brokers, including characteristics such as age or gender. Seamless leads where leaving and building are concerned: unlimited exports on both paid tiers against Apollo's metered export credits, and an interface and assistant connection on the free plan against Apollo's gate at its Organization tier. Apollo carries a D on sending discipline. Seamless now sends too, and publishes no discipline for it either.
- You want to price the whole purchase without a call. Apollo publishes a free plan with contact database access, then Basic at forty nine dollars a user a month on annual billing, Professional at seventy nine and Organization at one hundred and nineteen with a three seat minimum, with credits, sequence limits and feature gates stated per tier, where Seamless prices neither paid tier.
- You need to answer where the data came from. Apollo names three sourcing routes, including a contributor network of more than two million people and the Email Finder and Open Tracker features through which it grows, accepts controller status over that database, and sends a processing notice telling people their business details were added.
- Your team dials. Apollo screens its database against multiple do not call registries inside the product, is a registered data broker in California, Oregon, Texas and Vermont, and names its data protection officer and its European representative, where Seamless's terms hand every screening obligation to the customer while its new engagement layer places calls.
- You want to leave with what you paid for. Seamless states unlimited exports as a headline entitlement on both paid tiers and export download on the free tier, where Apollo meters export as a credit allocation per tier, ten a month on its free plan, so a large book of revealed contacts leaves only at the pace the subscription allows.
- You will build on it from day one. Seamless lists its application interface and its assistant connection against the free plan, so a buyer paying nothing can automate, where Apollo gates interface access to its Organization tier and above.
- You want security evidence at every price point. Seamless marks its SOC 2 attestation as covering all tiers including the free one, lists controls from single sign on through named identity providers to bot protection and multi region redundancy, and runs a searchable trust center question set covering impact assessments and data subject rights.
This comparison is published by GTM Tech Index, an independent research platform that compares go to market software vendors objectively. Apollo.io and Seamless.AI are each graded against the same capability taxonomy, from each vendor's own public materials, under the GTM Tech Index verification standard. No vendor pays for placement, and no vendor has reviewed this page. How this evidence is graded
Plain facts
| Apollo.io | Seamless.AI | |
|---|---|---|
| Primary category | Data & Enrichment | Data & Enrichment |
| Founded | Not published | Not published |
| Headquarters | Not published | Not published |
| Website | www.apollo.io | seamless.ai |
Side by Side
| Axis | A Apollo.io |
S Seamless.AI |
|---|---|---|
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AI Capability
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| AI Centrality | ||
| Autonomy and Oversight Model | ||
| AI Disclosure and Model Transparency | ||
| Operational and Outcome Evidence | ||
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Compliance and Risk
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| Outreach Compliance Posture | ||
| Data Privacy Posture | ||
| Data Licensing and Provenance | ||
| Platform Terms Exposure | ||
| AI Safety and Data Stewardship | ||
| Recipient Disclosure and Authenticity | ||
|
Integration and Deployment
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| Ecosystem and Integration Depth | ||
| Deployment Model and Data Residency | ||
| Security Certifications and Trust Center | ||
|
Commercial and Operational
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| Commercial Transparency | ||
| Exit and Data Portability | ||
| Deliverability and Sending Discipline | ||
| Segment and Market Coverage | ||
The short version of each
Apollo.io
Apollo.io is a sales intelligence and engagement platform combining a contact database it describes as worldwide with a sequencer, a dialer, a Chrome extension and an AI assistant launched in March 2026, used by more than five hundred and fifty thousand companies by its own count. The GTM Tech Index grades it A on four axes: commercial transparency, with a free plan and per user rates of forty nine, seventy nine and one hundred and nineteen dollars a month on annual billing; data licensing, naming a contributor network of more than two million people, public sources and purchased lists; data privacy, with a published processing notice telling people their details were added; and outreach compliance, as a registered data broker in four states that screens its database against do not call registries in the product. It takes B on security, with SOC 2 Type II and ISO 27001 audited by a named firm. It grades D on deliverability, where reviewers report bounce rates of fifteen to twenty five percent.
Source: GTM Tech Index, 2026
Seamless.AI
Seamless.AI is a contact data platform built around a search engine it describes as researching a contact on request rather than serving a stored row, with a browser extension that surfaces numbers and addresses for professionals on any website, an assistant connection sold as its own product, and an engagement layer for email, calls and tasks now included on every plan. The GTM Tech Index grades it B on security, for a SOC 2 attestation of the period type offered on every tier including the free one and a trust center on its own subdomain, B on ecosystem depth, with an interface and the assistant connection available on the free plan, and B on segment coverage, addressing twelve roles, nine industries and four company sizes with pages of their own. It grades D on commercial transparency, publishing no rate for either paid tier, and C on the other thirteen axes, including data licensing, where no sourcing statement is published, and data privacy, where its state policy discloses sale to data brokers.
Source: GTM Tech Index, 2026
Common questions
Is Apollo better than Seamless.AI?
On published evidence, yes by a wide margin. Apollo takes four A grades in the GTM Tech Index, on commercial transparency, data licensing, data privacy and outreach compliance, and Seamless.AI takes none. Seamless leads on exports and on how low in its price ladder programmatic access starts, and it avoids Apollo's D on deliverability. Both grade B on security and ecosystem depth.
Is Seamless.AI cheaper than Apollo?
Only Apollo lets you check. It publishes a free plan and per user rates of forty nine, seventy nine and one hundred and nineteen dollars a month on annual billing, or fifty nine, ninety nine and one hundred and forty nine monthly. Seamless.AI shows figures only for its free tier of one user and fifty credits, says in its own questions section that its second tier starts at ten thousand annual credits, and prices its assistant, enrichment, workflow and intent additions nowhere. Independent commentary reports that its credits are consumed whether or not a lookup returns usable data. Graded by GTM Tech Index against seventeen capability axes from each vendor's own published materials, verified September 27, 2026. No vendor pays for placement.
Where do Apollo and Seamless.AI get their data?
Apollo names three routes: a contributor network of more than two million people sharing business contacts through its Email Finder and Open Tracker features, publicly available sources and purchased lists, which the GTM Tech Index grades A. Seamless.AI publishes no sourcing statement. Its policies show that it takes connections to users' email, professional network, customer record and social accounts, that customer information feeds its processes unless excluded, and that its engine researches contacts on request, which grades it C.
Which has more accurate data, Apollo or Seamless.AI?
Neither answers it cleanly. Apollo publishes an email accuracy figure of ninety six percent, while independent reviews report bounce rates of fifteen to twenty five percent, and its own help center carries entries on why verification vendors flag its emails and why connected mailboxes see high bounce rates. Seamless.AI publishes no match, accuracy or bounce rate at all, on a product priced per researched contact. Test both on a sample of your own contacts before buying. Graded by GTM Tech Index against seventeen capability axes from each vendor's own published materials, verified September 27, 2026. No vendor pays for placement.
How does the GTM Tech Index grade Apollo.io and Seamless.AI?
Both are graded on the same seventeen capability and compliance axes from public sources, at a documented depth of sixteen each. Apollo.io takes A on four axes, B on six, C on six and D on deliverability. Seamless.AI takes B on security, ecosystem depth and segment coverage, C on thirteen and D on commercial transparency. The index publishes no composite score and declares no winner.
Related comparisons
Other published head to head assessments involving these vendors or their closest peers. The full set for this category is on the Data & Enrichment page.
The shared silence is what each platform does with your own data. At Apollo, connecting a mailbox feeds business contacts into a contributory database served to every other customer, competitors included, and at Seamless customer information feeds the vendor's processes unless the customer asks to be placed on an exclusion list. Both disclose that much, and neither states whether customer records, sequence content or the outreach its assistant writes trains any model.
Neither names a model provider. The second silence is the recipient of AI written outreach. Apollo notifies people that it holds their details, Seamless offers three self serve removal routes without notifying anyone, and neither marks a message as machine written. One exposure belongs here rather than in the verdict.
Seamless's state privacy policy discloses that personal information may be sold to data brokers and aggregation providers, that the categories may include protected class characteristics such as age or gender, and that information may be shared for cross context behavioral advertising. The benign reading is that it is describing the broker market accurately. Ask Seamless in writing whether a lookup that returns nothing consumes a credit, and ask Apollo what native protection exists for a connected mailbox's sending reputation.