7 Best Seamless.AI Alternatives in 2026 (Compared)

People leave Seamless.AI when it stops being a sales app and becomes a data source they pay for per record. A contact costs 1 Universal Credit, and a search costs 1 credit per 10 results (Seamless.AI API overview, September 2026). Pro carries 10,000 credits a month per license, so 1M records a month is 100 Pro licenses (Seamless.AI credit docs, September 2026).

Seamless.AI publishes no dollar price and no standalone API price (Seamless.AI API page, September 2026). The default limit is 60 requests a minute per endpoint, shared by your whole organization, and research runs as a job you poll (Seamless.AI docs, September 2026).

This page ranks seven alternatives for API and volume buyers. LeadOcean is first because it has one flat price and a synchronous API. For a two-column view, see LeadOcean vs Seamless.AI. Plan detail is in Seamless.AI pricing.

TL;DR

"1M records" here means 1M work-email lookups that return a result, one credit each where the vendor uses credits. Figures are list prices or, where noted, arithmetic. Where a vendor sells no plan at 1M, the cell says so. Volume quotes differ, so ask each vendor at your volume.

What we evaluated

• API access: which plan opens it, the endpoints that return people and companies, and the default rate limit.
• MCP: whether an agent can search and enrich through the server, or only read documentation.
• Price model: flat, credits or seats, and what 1M records a month costs at list price.
• Data: stated coverage, email and phone fields, and search filters.
• Limits that bite: plan gates, batch sizes, seat minimums and fair-use clauses.

We read each vendor's pricing page and docs in September 2026. We ran no find-rate or accuracy test for this page, so we quote no quality numbers.

1. LeadOcean: best for API, agent and volume buyers

LeadOcean is one dataset behind one REST API and one MCP server. It holds 693M people, 366M with an email and 166M with a phone number, plus 63M companies. You search with 50 people filters and 34 company filters. Counts are free.

Enrichment is POST /v1/people/enrich and it answers in the same response. You start no job and poll nothing. Phones are GET /v2/people/phone, and exports run up to 50,000 rows per request, so a 1M-row pull is 20 calls over two days.

The price does not move with volume. Pro is $499 a month with unlimited searches, enrichments and lookups, 5 API keys and 100 requests per second per key. There are no credits and no overage invoice. A very large month is paced down to one request a minute until the reset, not cut off.

curl -X POST "https://api.leadocean.io/v1/people/enrich" \
  -H "x-api-key: $LEADOCEAN_API_KEY" \
  -H "content-type: application/json" \
  -d '{"linkedin_url":"https://www.linkedin.com/in/jane-doe","reveal_email":true}'

The MCP server at https://api.leadocean.io/mcp signs in with OAuth 2.1 and exposes 12 tools, from search_leads to find_phone and export_leads. Claude, Cursor or your own agent can pull records directly. count_leads is free, so an agent sizes an audience before it spends a record.

Pros

• Flat $499 a month at any volume, with no credit meter.
• REST and MCP on every plan, including Free.
• A synchronous enrich call, at 100 requests per second per key.
• Email status on every record, from verified to spam_trap.
• Free counts, and a miss on POST /v1/people/enrich is a free 404.

Cons

• No Chrome extension, dialer, sequencer, CRM or table builder. You work in the app's Exports page, the API or MCP.
• Fewer phone numbers than Seamless.AI claims: 166M people with a phone number, against its 448M+ mobile numbers.
• One dataset, so a niche source needs another tool.

Best for: engineers, RevOps and agents that need volume and a fixed bill.

Pricing: Free is 1,000 records, one-off, no card. Pro is $499 a month, flat (LeadOcean pricing, September 2026).

2. BlitzAPI: best for flat-price search and enrichment by API

BlitzAPI sells B2B data as an API on flat monthly plans. Its pricing page lists 550M+ profiles, 65M+ companies, 65M+ verified emails and 45M+ US phone numbers (BlitzAPI pricing, September 2026). It is the closest rival to LeadOcean on price model. See LeadOcean vs BlitzAPI.

The plan ladder is where it gets fiddly. Core is $399 a month and leaves out emails and phones. Plus is $499 and adds verified work emails. Full is $599 and adds US phone numbers. If you enrich for contact data, you buy Plus or Full.

Check two details before you commit. The 50 requests per second is tied to accounts opened by September 30, 2026, against a standard 5 per second, and limits apply per endpoint (BlitzAPI docs, September 2026). Its MCP server gives an assistant the API documentation, not the data (BlitzAPI docs, September 2026).

Pros

• Flat monthly price. The stated 15,000,000 results a month is a launch-offer limit for accounts opened by September 30, 2026 (Terms 9.1). Limits for later accounts are not published.
• No credits and no seats to count.
• Jobs data and identity resolution sit next to people and company search.
• A free trial of 1,000 credits with no card.

Cons

• Three paid tiers, and phones need the top one.
• Phone numbers are US only.
• The MCP server reads docs. An agent cannot search or enrich through it.
• The fast rate limit depends on when the account opened.

Best for: teams that want a flat-price search and enrichment API and run their own code.

Pricing: Core $399, Plus $499, Full $599 a month (BlitzAPI pricing, September 2026).

3. LeadMagic: best for cheap valid emails and free in-app search

LeadMagic is a credit-based enrichment API. It lists 400M+ people, 25M+ companies and 46M+ job posts, reachable through REST, CSV, a command-line tool and a hosted MCP server (LeadMagic, September 2026). Failed lookups cost nothing.

The credit price falls as you climb the plans. Essential is $99 a month for 5,000 credits. Professional is $499 for 50,000. Ultimate is $849 for 100,000, or $0.00849 a credit (LeadMagic pricing, September 2026). A valid email costs 1 credit and a mobile costs 5. Searching in the app spends no credits on any paid plan. In the API, Essential and Growth bill about 1 credit per person returned. Professional and Ultimate get zero-credit search at 5 and 10 requests per second (LeadMagic docs, September 2026).

The Email Finder endpoint allows 600 requests a minute. LeadMagic also says a sustained find rate below 10% can lead to throttling or suspension (LeadMagic docs, September 2026). The MCP server uses OAuth, and a preview_cost call shows the price of a large job first (LeadMagic docs, September 2026). See LeadOcean vs LeadMagic.

Pros

• The lowest per-credit list price in this group, apart from flat plans.
• No charge when an email is not found.
• Searching in the app spends no credits on any paid plan.
• Hosted MCP with a cost preview before large operations.

Cons

• The top public plan is 100,000 credits, so 1M a month has no public price.
• A smaller stated database than Seamless.AI: 400M+ people.
• A minimum find-rate policy can throttle lists with poor match rates.

Best for: teams that enrich a few hundred thousand valid emails a month and want the cheapest credits.

Pricing: Essential $99, Growth $249, Professional $499, Ultimate $849 a month (LeadMagic pricing, September 2026).

4. FullEnrich: best for waterfall emails and mobiles behind an API

FullEnrich queries 25+ sources for each contact and charges only for data it finds (FullEnrich pricing, September 2026). Pro lists API access, people and company search, unlimited users and an MCP server. It suits teams that care about mobiles more than raw database size.

Credits are the meter. A work email costs 1 credit, a personal email 3 and a mobile 10. Pro starts at $29 a month for 500 credits, or $0.058 each. The default step is $55 a month for 1,000 credits, which is $0.055 each. Search costs 0.25 credits per person returned (FullEnrich docs, September 2026). A mobile at $0.055 a credit costs $0.55.

The API allows 60 calls a minute, with up to 100 contacts in a bulk request, so 6,000 contacts a minute. Higher limits are an Enterprise feature (FullEnrich docs, September 2026). The MCP server can search, enrich and export, and it asks you before it spends credits (FullEnrich help, September 2026). See LeadOcean vs FullEnrich.

Pros

• Waterfall across 25+ sources, so one call can cover several vendors.
• Search, enrichment and export in the MCP server.
• SOC 2 Type II, GDPR and CCPA listed on the pricing page.
• Credits roll over for 3 months on monthly plans.

Cons

• Mobiles cost 10 credits each, so phone-heavy pulls get expensive fast.
• The default API limit is 60 calls a minute.
• A credit meter at volume. There is no public price at 1M work emails: the top monthly tier is 100,000 credits for $3,500 a month.

Best for: teams that want waterfall contact data, mostly emails and mobiles, through an API or an agent.

Pricing: Pro from $29 a month for 500 credits, Enterprise custom (FullEnrich pricing, September 2026).

5. People Data Labs: best for data licences and per-match enrichment

People Data Labs (PDL) is a long-running person and company data API with bulk licences. It is ISO and SOC 2 Type 2 compliant, which matters for procurement (PDL pricing, September 2026). A request that returns a person costs one credit, and a miss costs none.

The entry price is high per record. Pro starts at $98 a month for 350 credits, and PDL puts Pro at about $0.20 to $0.28 a profile (PDL blog, February 2026). The Free plan gives up to 100 records a month with contact data hidden (PDL docs, September 2026). Above about 100,000 profiles a year it is quote only.

Paid plans default to 1,000 enrichment calls a minute, and the bulk endpoint takes up to 100 records per request (PDL docs, September 2026). PDL's docs index lists no MCP page (PDL docs index, September 2026). Community wrappers exist, but they are not PDL's own.

Pros

• A fast API with a stated 1,000 calls a minute on paid plans.
• Bulk person enrichment and dataset licences for your own warehouse.
• Unsuccessful requests are not billed.
• ISO and SOC 2 Type 2 shown on the pricing page.

Cons

• About $0.20 to $0.28 a profile on Pro, and volume above about 100,000 profiles a year needs a sales call.
• Contact data is hidden on the Free plan.
• No MCP page in the docs, so agents need a wrapper you host.

Best for: teams that license data or need compliance paperwork and accept per-record pricing.

Pricing: Free up to 100 records a month. Pro from $98 a month for 350 credits. Enterprise custom (PDL pricing, September 2026).

6. ZoomInfo (GTM AI): best for ZoomInfo data on pay-as-you-go credits

GTM AI is ZoomInfo's headless product. It sells ZoomInfo contact, company and intent data through an API, an MCP server and a CLI (GTM AI pricing, September 2026). It is a separate track from ZoomInfo's platform plans, which are sold by sales. ZoomInfo lists 500M+ contacts and 100M+ companies (GTM AI docs, September 2026).

Search, lookup and find-similar are free. A data credit covers one company, contact or intent record enriched or exported, from $0.45 each on a small purchase down to $0.25 each at 100,000 credits ($25,000). Free signup gives 1,000 data and 1,000 AI credits, and top-ups start at $20. ZoomInfo says a record is charged once per 12 months.

The free tier runs at 5 requests per second and 5 apps. The MCP server signs in per user, and its enrich tools take up to 10 records per call (GTM AI docs, September 2026). Mobile phone data, SSO and custom limits sit in Enterprise packages.

Pros

• Free search and lookup, so you pay only when you enrich.
• API, MCP and CLI on the free tier, with no card.
• Intent and signal data sit next to contacts.
• Credits do not expire while the account is active.

Cons

• The rate card runs from $0.45 a credit down to $0.25 at 100,000 credits, and it stops there. There is no public price at 1M.
• Mobile phone data needs an Enterprise package.
• 5 requests per second and 10 records per MCP enrich call on the free tier.
• Volumes above 100,000 credits go to Enterprise and a sales quote.

Best for: agent builders who want ZoomInfo data and accept a per-record price.

Pricing: Free 1,000 data and 1,000 AI credits. Data credits from $0.45 each down to $0.25 at 100,000 credits (GTM AI pricing, September 2026). See LeadOcean vs ZoomInfo.

7. Apollo: best for reps who want a database and a sequencer in one

Apollo is the closest swap for Seamless.AI's rep workflow. It lists 240M contacts and 30M companies, sequences, a dialer and a Chrome extension (Apollo pricing, September 2026). It ranks last here because pricing is built around seats, not volume. See LeadOcean vs Apollo.

Free gives 900 credits per seat a year. Basic is $49 per seat a month with 30,000 credits a year. Professional is $79 with 48,000. Organization is $119 with 72,000 and a three-seat minimum, all billed annually.

For code, the limits are workable. Enrichment allows 1,000 requests a minute on paid plans, and search allows 200 a minute and 50,000 a day (Apollo docs, September 2026). The MCP server works on any plan, including Free, and signs in with OAuth (Apollo MCP page, September 2026).

Pros

• Database, sequences, dialer and Chrome extension in one tool.
• MCP server on every plan, with OAuth sign-in.
• A free plan and a 14-day trial of paid plans.
• The list price per rep is low next to most sales suites.

Cons

• Seats and credits both scale your bill.
• 1M records a month needs about 400 Basic seats at list.
• A rep app first, so bulk pulls are not its design center.

Best for: sales reps who prospect and send from one workspace.

Pricing: Free. Basic $49, Professional $79, Organization $119 per seat a month, billed annually (Apollo pricing, September 2026).

Comparison table

Sources are linked in each tool section, all checked in September 2026. Vendors change plans often, so confirm on the pricing page before you buy. The 1M column is list price for 1M work-email lookups. Apollo is 400 Basic seats at $49 on yearly billing, or 250 Professional seats at $99 on monthly billing. PDL and ZoomInfo have no public 1M price, so their cells give the nearest published figure. LeadMagic and FullEnrich sell no public plan at 1M.

How to choose

• You pull data in code or with an agent, at volume: LeadOcean. One flat price, REST and MCP on every plan, 100 requests per second.
• You want a flat-price API from a second vendor: BlitzAPI Plus, if you can live with a docs-only MCP server.
• You buy valid emails by the hundred thousand: LeadMagic, at $0.00849 a credit on Ultimate.
• You need waterfall emails and mobiles: FullEnrich, and budget 10 credits per mobile.
• You need compliance paperwork or a licensed dataset: People Data Labs.
• You want ZoomInfo data inside an agent: GTM AI, and price the credits at your volume first.
• Your reps live in one tool with a dialer: Apollo, or stay on Seamless.AI.
• You need Seamless.AI's mobile numbers for a short call list: keep a small Seamless.AI license for the reps, and pull the bulk audience elsewhere.

Verdict

LeadOcean wins for API, agent and volume buyers. It has a flat price, a synchronous enrich call and an MCP server that returns records. BlitzAPI is the flat-price runner-up if you run your own code. LeadMagic wins for cheap valid emails and FullEnrich for waterfall mobiles. People Data Labs wins for licensed datasets, ZoomInfo GTM AI for ZoomInfo data on a meter and Apollo for reps who want a sequencer. Stay on Seamless.AI if your team lives in its extension and dialer. Otherwise start on the free plan and compare the same lookups.

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