# The Data City, free: Similar companies API

> Classify any company by description or website. Get RTICs, RSICs, RNAICs, SICs, and similar companies in a single call.

The Data City's similar companies API on its Free tier plan. It costs $0.00 per 1,000 companies. It returns 3 of the 13 key fields we check: Match, Description, Industry and type.
The cheapest of the 54 plans we rank by price is [EnvoAPI, $499 monthly, Scale, GET /v1/companies/similar/by-slug](https://datacircle.dev/similar-company-apis/envoapi/499-monthly-scale-get-v1-companies-similar-by-slug/llms.txt), at $0.10 per 1,000.

- This page: https://datacircle.dev/similar-company-apis/the-data-city/free
- Get it: https://thedatacity.com/pricing
- Its API docs: https://docs.thedatacity.com/instant-classification/guides/quickstart.md#3-classify-a-company
- Sold by: The Data City (https://thedatacity.com)
- Checked: 2026-10-25

## In the answer

- Completeness: 23%
- Match: ✓
- Description: ✓
- Industry and type: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Per: page, size not stated
- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Classify any company by description or website. Get RTICs, RSICs, RNAICs, SICs, and similar companies in a single call.

## Data

- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 20 requests
- Enough for: 20 pages, once
- Expires: never

## Rate limit

- Per second: 0.083
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of Text or Website
- Method: POST
- Path: /api/v1/instantClassification

## About the plan

- Plan: Free tier
- Who can get it: anyone with a work email address (consumer and disposable email providers are rejected)

## The 20 fields the plan's answer can hold

RTIC code, RTIC description, RTIC score, RTIC words matched, RSIC code, RSIC description, RSIC score, RNAICS code, RNAICS description, RNAICS score, SIC code, SIC description, company number, company name, website, similarity score, total words processed, processing time in milliseconds, website sent, description sent

## The Data City's plans (2)

- [The Data City, free](https://datacircle.dev/similar-company-apis/the-data-city/free/llms.txt): $0.00 per 1,000, 23% complete
- [The Data City, contact us](https://datacircle.dev/similar-company-apis/the-data-city/contact-us/llms.txt): 23% complete

## The Data City's calls (1)

- `POST /api/v1/instantClassification`: [The Data City, free](https://datacircle.dev/similar-company-apis/the-data-city/free/llms.txt)

## The Data City's APIs (6)

- [The Data City: similar companies API pricing, 2 plans](https://datacircle.dev/similar-company-apis/the-data-city/free/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, POST /v1/fr/companies](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-post-v1-fr-companies/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, POST /v1/de/companies](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-post-v1-de-companies/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, POST /v1/ie/companies](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-post-v1-ie-companies/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, POST /v1/us/companies](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-post-v1-us-companies/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, GET /v1/fr/search](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-get-v1-fr-search/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, GET /v1/de/search](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-get-v1-de-search/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, GET /v1/ie/search](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-get-v1-ie-search/llms.txt)
- [The Data City: company discovery API pricing, 1 plan, GET /v1/us/search](https://datacircle.dev/company-discovery-apis/the-data-city/contact-us-beta-api-key-get-v1-us-search/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, GET /v1/fr/companies/{companyNumber}](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-get-v1-fr-companies-companynumber/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, GET /v1/de/companies/{companyNumber}](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-get-v1-de-companies-companynumber/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, GET /v1/ie/companies/{companyNumber}](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-get-v1-ie-companies-companynumber/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, GET /v1/us/companies/{companyNumber}](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-get-v1-us-companies-companynumber/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, POST /v1/fr/companies/batch](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-post-v1-fr-companies-batch/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, POST /v1/de/companies/batch](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-post-v1-de-companies-batch/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, POST /v1/ie/companies/batch](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-post-v1-ie-companies-batch/llms.txt)
- [The Data City: company enrichment API pricing, 1 plan, POST /v1/us/companies/batch](https://datacircle.dev/company-enrichment-apis/the-data-city/contact-us-beta-api-key-post-v1-us-companies-batch/llms.txt)
- [The Data City: company hierarchy API pricing, 2 plans, GET /v1/de/companies/{companyNumber}/group](https://datacircle.dev/company-hierarchy-apis/the-data-city/contact-us-beta-api-key-get-v1-de-companies-companynumber-group/llms.txt)
- [The Data City: company hierarchy API pricing, 2 plans, GET /v1/ie/companies/{companyNumber}/group](https://datacircle.dev/company-hierarchy-apis/the-data-city/contact-us-beta-api-key-get-v1-ie-companies-companynumber-group/llms.txt)
- [The Data City: company hierarchy API pricing, 2 plans, GET /v1/us/companies/{companyNumber}/group](https://datacircle.dev/company-hierarchy-apis/the-data-city/contact-us-beta-api-key-get-v1-us-companies-companynumber-group/llms.txt)
- [The Data City: cached company enrichment API pricing, 1 plan, GET /v2/companies/{companyNumber}](https://datacircle.dev/cached-company-enrichment-apis/the-data-city/contact-us-api-access-get-v2-companies-companynumber/llms.txt)
- [The Data City: cached company enrichment API pricing, 1 plan, POST /v2/companies/batch](https://datacircle.dev/cached-company-enrichment-apis/the-data-city/contact-us-api-access-post-v2-companies-batch/llms.txt)
- [The Data City: cached company enrichment API pricing, 1 plan, POST /v2/companies/by-website/batch](https://datacircle.dev/cached-company-enrichment-apis/the-data-city/contact-us-api-access-post-v2-companies-by-website-batch/llms.txt)
- [The Data City: cached company enrichment API pricing, 1 plan, GET /v2/companies/by-website](https://datacircle.dev/cached-company-enrichment-apis/the-data-city/contact-us-api-access-get-v2-companies-by-website/llms.txt)
- [The Data City: cached company enrichment API pricing, 1 plan, POST /v2/companies/by-website](https://datacircle.dev/cached-company-enrichment-apis/the-data-city/contact-us-api-access-post-v2-companies-by-website/llms.txt)
- [The Data City: cached company discovery API pricing, 1 plan](https://datacircle.dev/cached-company-discovery-apis/the-data-city/contact-us/llms.txt)

## The Data City: similar companies API alternatives

- [Zooq, free](https://datacircle.dev/similar-company-apis/zooq/free/llms.txt): $0.00 per 1,000, 15% complete, live
- [Edges, free](https://datacircle.dev/similar-company-apis/edges/free/llms.txt): $0.00 per 1,000, 15% complete, live
- [EnvoAPI, free, Free, GET /v1/companies/similar/by-slug](https://datacircle.dev/similar-company-apis/envoapi/free-free-get-v1-companies-similar-by-slug/llms.txt): $0.00 per 1,000, 15% complete, live
- [treg, free](https://datacircle.dev/similar-company-apis/treg/free/llms.txt): $0.00 per 1,000, 0% 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 2026-10-25.

- https://docs.thedatacity.com/global-api/index.md
- https://docs.thedatacity.com/instant-classification/guides/quickstart.md
- https://docs.thedatacity.com/instant-classification/guides/rate-limits.md
- https://docs.thedatacity.com/instant-classification/guides/response-reference.md
- https://docs.thedatacity.com/instant-classification/index.md
- https://instant-classification-api.thedatacity.com/api/v1/openapi.json
- https://thedatacity.com/api-access
- https://thedatacity.com/pricing
- https://thedatacity.com/terms-and-conditions