Seamless.AI vs AI-Ark (2026): Data, Pricing and API Compared

Seamless.AI is a sales app with a Chrome extension, a dialer and an API, sold by quote. AI-Ark is a B2B database with public credit rates. Pick Seamless.AI for reps who call mobiles. Pick AI-Ark to build lists and read a price first. Neither prints a price at 1M records.

Verdict

• Pick Seamless.AI if your reps live in an app, dial mobile numbers and want a phone and an email for one credit. You will buy by quote and sign an annual term.
• Pick AI-Ark if you want a published entry price, lookalike company search and emails checked at export. You can start on the free plan and cancel any month.
• Pick neither if you pull millions of records in code and want one flat bill. Both bill by the credit. LeadOcean is $499 a month flat for REST and MCP, with no dialer and no rep app.

Side by side

Data and coverage

The sizes are not comparable. Seamless.AI claims 2.2B+ verified contacts, 448M+ verified mobile numbers and 121M+ companies (Seamless.AI API page, September 2026). AI-Ark claims 400M+ people and 70M+ companies, with a 30-day refresh cycle (AI-Ark docs, September 2026). Both are vendor claims, and neither is audited.

On paper Seamless.AI is the bigger database, and the gap is largest on phones. AI-Ark publishes no phone count. It sells a mobile finder at 5 credits per number found, and a miss costs nothing (AI-Ark docs, September 2026).

Emails run the other way on proof. AI-Ark verifies each email through BounceBan as it is returned (AI-Ark docs, September 2026). Seamless.AI claims 1.6B+ verified business emails but gives no per-record status in the pages we read.

Search differs in shape. Seamless.AI contact search takes 39 filters and modifiers, and company search takes 23 (Seamless.AI docs, September 2026). AI-Ark adds SMART text matching, where "creative director" also finds "art director", and lookalike search from up to 5 seed companies (AI-Ark docs, September 2026).

Run your own test. Pull 500 records for one persona from each tool, then count how many have a usable email and phone.

API and developer experience

Both have REST and MCP. Seamless.AI is a three-step flow. You search, submit a research job, then poll for the result or wait on a webhook (Seamless.AI docs, September 2026). AI-Ark returns a person and a verified email in one real-time call.

Seamless.AI research by LinkedIn URL returns request IDs, not data. You then poll GET /contacts/research/poll (Seamless.AI docs, September 2026).

curl -X POST https://api.seamless.ai/api/client/v1/contacts/research \
  -H "Content-Type: application/json" \
  -H "Token: $SEAMLESS_API_KEY" \
  -d '{"contacts":[{"liProfileUrl":"https://www.linkedin.com/in/jane-doe"}]}'

AI-Ark's single export returns the profile and a verified email at once. It costs 1 credit, and 0 if no valid email is found (AI-Ark docs, September 2026).

curl --request POST \
  --url 'https://api.ai-ark.com/api/developer-portal/v1/people/export/single' \
  --header "X-TOKEN: $AI_ARK_API_KEY" \
  --header 'Content-Type: application/json' \
  --data '{"url":"https://www.linkedin.com/in/jane-doe"}'

Search speed is the same on paper. AI-Ark returns up to 100 records a call at 5 calls a second, about 500 records a second (AI-Ark docs, September 2026). Seamless.AI returns up to 500 a call at 60 calls a minute, which is also about 500 a second (Seamless.AI docs, September 2026).

The caps differ. One AI-Ark search retrieves at most 10,000 records. Past that you re-run the search with exclusion lists, which expire after 24 hours and cap at 50 a day (AI-Ark docs, September 2026). Seamless.AI states no such cap, but the rate limit is shared by every key and user in your organization.

MCP setup differs too. AI-Ark's server takes your key in the URL, so it ends up in a config file (AI-Ark MCP docs, September 2026). Seamless.AI offers OAuth 2.1 sign-in, but an admin must switch MCP on first.

Pricing

Neither tool publishes a full price list. Seamless.AI's pricing page is a quote form. Its API page says keys are bundled with plan tiers or sold as an add-on, with usage drawing credits (Seamless.AI pricing, September 2026; API page). Licenses come as Free (50 credits, no refill), Basic (250 credits a month) and Pro (10,000 credits a month) (Seamless.AI credit docs, September 2026).

AI-Ark prints more. Free is 100 credits a month. The Usage-based plan is $49 a month for 5,000 credits. Plans above 30,000 credits list $2 to $4 per 1,000, but Scale (450K+ credits) and Enterprise carry no price (AI-Ark pricing, September 2026).

Terms differ. Seamless.AI subscriptions are annual. Cancelling needs 60 days' notice before renewal or the plan renews for 12 months (Seamless.AI terms, September 2026). AI-Ark monthly plans cancel any time with no fee, and unused credits roll over up to 2x the allowance (AI-Ark pricing, September 2026).

Here is the worked example for 10,000 and 1M records a month, each with a work email.

Arithmetic for Seamless.AI: research costs 1 credit per record, and search adds 1 credit per 10 results returned. So 10,000 records is 10,000 credits, plus 1,000 for search. At 1M that is 1,000,000 credits plus 100,000. A Pro license holds 10,000 credits a month, so 1M credits is 100 licenses or a bulk pool, both by quote (Seamless.AI docs, September 2026).

Arithmetic for AI-Ark: 0.5 credit for the profile plus 0.5 for a found email is 1 credit per person (AI-Ark pricing, September 2026). At the $49 plan's rate of $9.80 per 1,000 credits, 10,000 credits would be $98, but the page lists no plan for that size. We do not multiply any rate out to 1M.

Phones change the credit math. One Seamless.AI credit covers a contact's email and phone together. On AI-Ark a mobile adds 5 credits, so a person with an email and a mobile is 6 credits. That makes 1M such people 6,000,000 AI-Ark credits against 1,000,000 Seamless.AI credits. The dollar value of a credit differs, and neither vendor publishes it at that volume, so ask both for a quote.

AI-Ark also says you pay once for a contact, and re-exporting one you own is free (AI-Ark pricing, September 2026). If you re-pull the same accounts each month, that lowers the real bill.

Where Seamless.AI wins

Seamless.AI wins on phones and on the rep workflow. It claims 448M+ verified mobile numbers, and one credit buys the email and the phone together (Seamless.AI API page, September 2026). Its platform ships a Chrome extension, a dialer and emailing, so a rep can find a person and call them from one screen.

It also wins on size, by its own claims: 2.2B+ contacts and 121M+ companies against 400M+ and 70M+. A search page returns up to 500 contacts, five times AI-Ark's 100. If your volume is mostly mobiles, the credit math favors it.

Where AI-Ark wins

AI-Ark wins on price visibility and list building. You can read the free plan, the $49 plan and the $2 to $4 per 1,000 range before you talk to anyone (AI-Ark pricing, September 2026). Seamless.AI shows a quote form.

It also wins on terms and discovery. Plans cancel monthly, credits roll over, and Free has API access. Lookalike search and SMART text matching make account lists cheap to build. A company export costs 0.1 credit (AI-Ark docs, September 2026). Emails come pre-verified, so a separate checking step is not needed.

If you need volume through an API

Neither tool fits a pipeline that pulls millions of records on a fixed budget, because both bill by the credit and neither prints a 1M price. LeadOcean is a data API with a hosted MCP server and a flat price. Free gives 1,000 records one-off with no card. Pro is $499 a month flat, with 100 requests per second per key and POST /v1/exports returning up to 50,000 rows per request.

It holds 693M people, 366M of them with an email, and 63M companies, behind REST and 12 MCP tools (pricing). It has no dialer, no Chrome extension and no rep workspace. Keep Seamless.AI for the reps who call, and use LeadOcean for the volume.

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