# Sixtyfour, free: Similar people API

> Find people who resemble a list you already have, such as your best customers or recent hires, and get them ranked by similarity.

Sixtyfour's similar people API on its Free plan. It costs $0.00 per 1,000 people. It returns 2 of the 13 key fields we check: Experience, Headline.
We rank 23 plans by price. [Kooperativa's $499 monthly plan](https://datacircle.dev/similar-people-apis/kooperativa/499-monthly/llms.txt) costs the least per 1,000 people: as little as $0.00023. Kooperativa's $499 monthly plan covers up to 21,600,000 pages a month at no extra cost. Each page holds 100 people.
[ZoomInfo's $45 pack](https://datacircle.dev/similar-people-apis/zoominfo/45-pack/llms.txt) covers any number of people. ZoomInfo's $45 pack costs less to start than Kooperativa's $499 monthly plan.
[Reverse Contact](https://datacircle.dev/similar-people-apis/reverse-contact/449-monthly/llms.txt), [DiscoLike](https://datacircle.dev/similar-people-apis/discolike/399-monthly/llms.txt) and [Anysite](https://datacircle.dev/similar-people-apis/anysite/300-monthly/llms.txt) are the best similar people API providers in our benchmark.

- This page: https://datacircle.dev/similar-people-apis/sixtyfour/free
- [Best similar people API in 2026](https://datacircle.dev/best-similar-people-api.txt)
- Get it: https://docs.sixtyfour.ai/guides/credits-and-pricing
- Request: `POST https://api.sixtyfour.ai/search/lookalike`
- API key: with the plan, on https://docs.sixtyfour.ai/guides/credits-and-pricing
- Its API docs: https://docs.sixtyfour.ai/api-reference/search/lookalike-search
- Sold by: Sixtyfour (https://www.sixtyfour.ai)
- Checked: 2026-10-27

## In the answer

- Completeness: 15%
- Experience: ✓ current job
- Headline: ✓

## Price

- $ per 1,000 people: $0.00
- Billing: free

## Charges

- Also pays for: from the same budget: Company Intelligence · People Intelligence · Deep Investigations · Bulk Intelligence · Find Email · Verify Email · Reverse Email · Find Phone · Reverse Phone · QA Agent · Age Verification · Deep Search · Filter Search · Search Export · Enrich LinkedIn Profile

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Find people who resemble a list you already have, such as your best customers or recent hires, and get them ranked by similarity.

## Data

- Keep data: no limit
- Use data: "The Content and Marks are provided in or through the Services \"AS IS\" for your internal business purpose only." "[...] no part of the Services and no Content or Marks may be copied, reproduced, aggregated, republished, uploaded, posted, publicly displayed, encoded, translated, transmitted, distributed, sold, licensed, or otherwise exploited for any commercial purpose whatsoever, without our express prior written permission." "You may not access or use the Services for any purpose other than that for which we make the Services available. The Services may not be used in connection with any commercial endeavors except those that are specifically endorsed or approved by us." "As a user of the Services, you agree not to: Systematically retrieve data or other content from the Services to create or compile, directly or indirectly, a collection, compilation, database, or directory without written permission from us. [...] Use any information obtained from the Services in order to harass, abuse, or harm another person. [...] Use the Services in a manner inconsistent with any applicable laws or regulations. [...] Engage in any automated use of the system, such as using scripts to send comments or messages, or using any data mining, robots, or similar data gathering and extraction tools. [...] Interfere with, disrupt, or create an undue burden on the Services or the networks or services connected to the Services. [...] Except as may be the result of standard search engine or Internet browser usage, use, launch, develop, or distribute any automated system, including without limitation, any spider, robot, cheat utility, scraper, or offline reader that accesses the Services, or use or launch any unauthorized script or other software. [...] Use the Services as part of any effort to compete with us or otherwise use the Services and/or the Content for any revenue-generating endeavor or commercial enterprise. Use the Services to advertise or offer to sell goods and services. Sell or otherwise transfer your profile."

## Plan

- Pay: $0
- You get: 64 credits a month
- Expires: does not roll over

## Rate limit

- Per second: 3.33
- Batch: 1,000

## Speed

- Answer: by polling

## The call

- You send: one of linkedin_urls or csv_resource_handle_id. Optional: guidance, analysis_sample_size
- Method: POST
- Path: /search/lookalike

## About the plan

- Plan: Free
- Who can get it: anyone aged 18 or over

## The 10 fields the plan's answer can hold

search ID, total results, public ID, full name, headline, profile photo, current company logo, lookalike score, lookalike rank, lookalike evidence

## Sixtyfour's plans (3)

- [Sixtyfour, free](https://datacircle.dev/similar-people-apis/sixtyfour/free/llms.txt): $0.00 per 1,000, 15% complete
- [Sixtyfour, top-up from $50](https://datacircle.dev/similar-people-apis/sixtyfour/top-up-from-50/llms.txt): 15% complete
- [Sixtyfour, contact us](https://datacircle.dev/similar-people-apis/sixtyfour/contact-us/llms.txt): 15% complete

## Sixtyfour's calls for this API (1)

- `POST /search/lookalike`: [Sixtyfour, free](https://datacircle.dev/similar-people-apis/sixtyfour/free/llms.txt)

## Sixtyfour's APIs (11)

- [Sixtyfour: LinkedIn company data API pricing, 3 plans](https://datacircle.dev/linkedin-company-profile-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: LinkedIn profile API pricing, 3 plans](https://datacircle.dev/linkedin-profile-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: email finder API pricing, 3 plans](https://datacircle.dev/find-email-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: similar people API pricing, 3 plans](https://datacircle.dev/similar-people-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: phone finder API pricing, 3 plans](https://datacircle.dev/find-phone-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: reverse email lookup API pricing, 3 plans](https://datacircle.dev/reverse-email-lookup-apis/sixtyfour/free/llms.txt)
- [Sixtyfour: company enrichment API pricing, 3 plans, POST /company-intelligence](https://datacircle.dev/company-enrichment-apis/sixtyfour/free-free-post-company-intelligence/llms.txt)
- [Sixtyfour: company enrichment API pricing, 3 plans, POST /company-intelligence-async](https://datacircle.dev/company-enrichment-apis/sixtyfour/free-free-post-company-intelligence-async/llms.txt)
- [Sixtyfour: company enrichment API pricing, 3 plans, POST /bulk-intelligence/company](https://datacircle.dev/company-enrichment-apis/sixtyfour/free-free-post-bulk-intelligence-company/llms.txt)
- [Sixtyfour: company discovery API pricing, 3 plans, POST /search/start-deep-search](https://datacircle.dev/company-discovery-apis/sixtyfour/free-free-post-search-start-deep-search/llms.txt)
- [Sixtyfour: company discovery API pricing, 3 plans, POST /search/query](https://datacircle.dev/company-discovery-apis/sixtyfour/free-free-post-search-query/llms.txt)
- [Sixtyfour: people search API pricing, 3 plans, POST /search/start-deep-search](https://datacircle.dev/people-search-apis/sixtyfour/free-free-post-search-start-deep-search/llms.txt)
- [Sixtyfour: people search API pricing, 3 plans, POST /search/query](https://datacircle.dev/people-search-apis/sixtyfour/free-free-post-search-query/llms.txt)
- [Sixtyfour: people enrichment API pricing, 3 plans, POST /people-intelligence](https://datacircle.dev/person-enrichment-apis/sixtyfour/free-free-post-people-intelligence/llms.txt)
- [Sixtyfour: people enrichment API pricing, 3 plans, POST /people-intelligence-async](https://datacircle.dev/person-enrichment-apis/sixtyfour/free-free-post-people-intelligence-async/llms.txt)
- [Sixtyfour: people enrichment API pricing, 3 plans, POST /bulk-intelligence/people](https://datacircle.dev/person-enrichment-apis/sixtyfour/free-free-post-bulk-intelligence-people/llms.txt)

## Sixtyfour: similar people API alternatives

- [Reverse Contact, free](https://datacircle.dev/similar-people-apis/reverse-contact/free/llms.txt): $0.00 per 1,000, 100% complete, stored
- [Anysite, free](https://datacircle.dev/similar-people-apis/anysite/free/llms.txt): $0.00 per 1,000, 92% complete, stored
- [Social Fetch, free](https://datacircle.dev/similar-people-apis/social-fetch/free/llms.txt): $0.00 per 1,000, 92% complete, live
- [SocialCrawl, free](https://datacircle.dev/similar-people-apis/socialcrawl/free/llms.txt): $0.00 per 1,000, 15% complete, live
- [Lusha, free](https://datacircle.dev/similar-people-apis/lusha/free/llms.txt): $0.00 per 1,000, 15% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

- https://docs.sixtyfour.ai/api-reference/errors
- https://docs.sixtyfour.ai/api-reference/search/filter-search
- https://docs.sixtyfour.ai/api-reference/search/lookalike-search
- https://docs.sixtyfour.ai/api-reference/search/search-endpoints
- https://docs.sixtyfour.ai/get-api-key
- https://docs.sixtyfour.ai/guides/credits-and-pricing.md
- https://docs.sixtyfour.ai/introduction
- https://www.sixtyfour.ai/legal/terms-of-service