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

Seamless.AI and Dealfront both sell B2B contact data for credits, but the products are built for different jobs. Seamless.AI is a prospecting platform with a Chrome extension and a dialer. Dealfront has traded as Leadfeeder since March 24, 2026, and its core is website-visitor identification (Leadfeeder rebrand FAQ, September 2026).

Verdict

• Pick Seamless.AI if reps need phones and one app to call from. One credit returns a contact's email and phone together, and it claims 448M+ verified mobile numbers. The price comes from sales.
• Pick Dealfront if the main job is seeing which companies visit your site, especially in Europe. It prints its plan prices, and contacts are an add-on paid in credits.
• Pick neither if you need volume through an API at a price you can read. Neither tool publishes a 1M price. LeadOcean is one option: Pro is $499 a month, flat.

Side by side

Data and coverage

Seamless.AI claims far more data. It lists 2.2B+ verified contacts and 121M+ companies, against Dealfront's 400M verified contacts and 60M companies. Both are the vendors' own numbers. Neither defines "verified" in a way you can audit, and a bigger claim is not a better match rate on your list.

Only Seamless.AI publishes email and phone counts: 1.6B+ verified business emails and 448M+ phone numbers (Seamless.AI, September 2026). Dealfront prints neither. You cannot compare coverage on paper, so you have to test it.

Phones are priced differently. At Seamless.AI one credit covers a contact's email and phone together (Seamless.AI docs, September 2026). At Dealfront, email alone is 0.2 credit, and email plus phone is 1 credit (Leadfeeder credits help, September 2026).

The data also comes from different places. Dealfront says its deep data comes from national trade registers and chambers of commerce. It also says it is built and hosted in the EU (Leadfeeder, September 2026). Seamless.AI does not state its sources on its pricing or API pages. If your market is Europe, test Dealfront first.

The products differ beyond the records. Dealfront's plans are sized by identified companies a month, from the last 100 on free Lite (Leadfeeder pricing, September 2026). Seamless.AI sells prospecting, bulk credits, job changes and buyer intent, and prices them by inquiry (Seamless.AI pricing, September 2026).

Test before you buy. Seamless.AI Free gives 50 credits once, and Dealfront Lite gives 20 credits a month but no API. Run the same 30 people through each and compare the match rate.

API and developer experience

Both are asynchronous. You submit a job, then fetch the result. The shape differs: Seamless.AI jobs take names or search result IDs, and Dealfront jobs take contact IDs that you must find first.

Seamless.AI takes the key in a Token header. You start a research job and get an HTTP 202 with requestIds (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": [
      { "contactName": "Jane Doe", "companyName": "Acme Corp", "title": "CTO" }
    ]
  }'

Next, call GET /contacts/research/poll with those requestIds, or take the result by webhook. A poll ends in done, error, missing or duplicate. The docs do not say whether a missing record is charged, and they do not say how long a job takes (Seamless.AI docs, September 2026).

Dealfront takes an X-Api-Key header or OAuth 2.0 (Leadfeeder API docs, September 2026). The IDs come from POST /v1/contacts/search, which costs no credits. Then you start a find-contact-data job and poll for it (Leadfeeder OpenAPI, September 2026):

curl --request POST \
  --url "https://api.leadfeeder.com/v1/contacts/find-contact-data-jobs?account_id=123456" \
  --header "X-Api-Key: $LEADFEEDER_API_KEY" \
  --header "Content-Type: application/json" \
  --data '{"data":{"type":"find_contact_data_job","attributes":{"contact_ids":["1515122"],"enrichment_type":"email_only"}}}'

enrichment_type is email_only or full, and full is the default. A job takes up to 100 contact IDs, or a list_id for a whole list. Credits are spent as contacts are enriched.

Rate limits differ in shape. Seamless.AI allows 60 requests a minute per endpoint, shared by every key and user in the organization. Search, research and poll each get their own window. Batches are larger: 500 records per research request (Seamless.AI docs, September 2026).

Dealfront allows 10 requests a second per key, a burst of 15, and 100,000 requests a month. Over either limit returns 429. The account manager can raise the monthly quota (Leadfeeder API docs, September 2026). The speed is higher, and the batches are smaller at 100 IDs a job.

On credits, a Seamless.AI search costs 1 credit per 10 results returned, and research costs 1 credit per record. Polling and reading org data cost nothing. Dealfront's contact search costs nothing, and enrichment costs 0.2 or 1 credit per contact (Seamless.AI docs; Leadfeeder credits help, September 2026).

On MCP, both run hosted servers with OAuth. Seamless.AI's has 57 tools. Its search tools use no credits, its research tools do, and MCP access must be enabled on the account (Seamless.AI MCP docs, September 2026). Dealfront's is in beta and follows the same credit rules as its API (Leadfeeder MCP docs, September 2026).

Pricing

Both tools meter by credit, and neither lets you buy a record at a posted price. Seamless.AI sells credits by quote. Dealfront prints plan fees but no price per extra credit. So the only unit you can compare is credits.

At 10,000 records a month

For Seamless.AI, 10,000 contacts is 10,000 credits, with email and phone included. A Pro license carries 10,000 credits a month, so that is one Pro license. If every record first comes from a search at 1 credit per 10 results, add 1,000 credits and you need two licenses (Seamless.AI credit docs, September 2026). Seamless.AI publishes no price for a Pro license, so there is no dollar figure here.

For Dealfront, 10,000 email-only contacts at 0.2 credit is 2,000 credits. Activate tops out at 1,500 credits, so you land in Scale. Scale runs from 1,000 credits at $599 a month to 5,500 credits at $2,089, billed annually (Leadfeeder pricing, September 2026). The steps between those tiers are on the pricing page slider.

With phones the sum changes. If all 10,000 contacts need email plus phone at 1 credit, that is 10,000 credits. That is above Scale's 5,500 ceiling, so the pull is an Enterprise quote (Leadfeeder pricing, September 2026).

A Dealfront credit unlocks a record for 12 months for the whole account. If most of your volume is repeat lookups, the real number falls (Leadfeeder credits help, September 2026).

At 1M records a month

For Seamless.AI: no public 1M price. The pull is 1,000,000 research credits, or 1,100,000 with a search first (1,000,000 / 10 = 100,000 extra). At 10,000 credits per Pro license that is 100 licenses, or a bulk pool, and both are quote only (Seamless.AI docs, September 2026). Seamless.AI publishes no price per credit (Seamless.AI bulk credits, September 2026).

For Dealfront: no public 1M price. 1M email-only contacts at 0.2 credit is 200,000 credits. With phones it is 1,000,000 credits. Scale's ceiling is 5,500 credits a month, and 200,000 / 5,500 is about 36 months of the top tier (Leadfeeder pricing, September 2026). Extra credits have no published price, and the monthly API quota is 100,000 requests per key.

Time is the other cost. At 500 records a call and 60 calls a minute, 1M records at Seamless.AI is 2,000 research calls, about 34 minutes of request windows, plus the search pages. Job completion time is not documented.

We do not multiply a rate out to 1M and call it a price. Ask both vendors for a quote at your volume.

Where Seamless.AI wins

• Phones. One credit covers email and phone together. It claims 448M+ verified mobiles.
• A bigger claimed dataset. 2.2B+ contacts and 121M+ companies, against 400M and 60M.
• Published coverage counts. It states email and mobile totals. Dealfront does not.
• Bigger batches. 500 records per research request against 100 IDs per Dealfront job.
• A rep workspace. A Chrome extension, a dialer and emailing sit next to the data (Seamless.AI, September 2026).

Where Dealfront wins

• Website visitor identification. It shows which companies visit your site, and its plans are sized around that job.
• Prices on the page. Lite is free, and Discover starts at $79 a month billed annually. Seamless.AI sends you to a form (Leadfeeder pricing, September 2026).
• Cheap emails. An email-only contact is 0.2 credit, and a credit stays unlocked for 12 months.
• A faster API. 10 requests a second per key against 60 a minute.
• European sources. Trade registers and chambers of commerce, with EU hosting (Leadfeeder, September 2026).

If you need volume through an API

We build LeadOcean, so weigh this section accordingly. LeadOcean holds 693M people and 63M companies, reachable over REST and an MCP server with 12 tools. Free is 1,000 records, one-off, with no card. Pro is $499 a month, flat, with no credits and a limit of 100 requests per second per key (LeadOcean pricing, September 2026).

For bulk work, POST /v1/exports returns up to 50,000 rows per request. The app also has an Exports page with a filter builder and CSV download (LeadOcean exports docs, September 2026). There is no sequencer, dialer, visitor tracking or Chrome extension. If your reps live in Seamless.AI or your marketers live in Dealfront, keep them there. See the Seamless.AI alternative page for a line-by-line version.

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