# Mangools, free: Related keywords API

> Start with a seed keyword and get up to 700 related keyword ideas, sorted by relevance. Each keyword can include essential metrics such as search volume, CPC, PPC, keyword difficulty (cached), and search volume history.

Mangools's related keywords API on its Free plan. It costs $0.00 per 1,000 keywords. It returns 5 of the 6 key fields we check: Search volume, Monthly trend, Cost per click, Competition, Keyword difficulty.
We rank 53 plans by price. [Mangools's $15 monthly plan](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt) costs the least per 1,000 keywords: $0.0001. Mangools charges for each page of results. We count 10,000 keywords on each page to get the $0.0001 price.
[Mangools](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt), [DataForSEO](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-dataforseo-labs-google-keyword-ideas-live/llms.txt) and [SE Ranking](https://datacircle.dev/related-keywords-apis/se-ranking/29-monthly-add-on-monthly-billing-get-v1-keywords-similar/llms.txt) are the best related keywords API providers in our benchmark.

- This page: https://datacircle.dev/related-keywords-apis/mangools/free
- [Best related keywords API in 2026](https://datacircle.dev/best-related-keywords-api.txt)
- Get it: https://mangools.com/plans-and-pricing
- Request: `GET https://api.mangools.com/v3/kwfinder/related-keywords`
- API key: with the plan, on https://mangools.com/plans-and-pricing
- Its API docs: https://apidocs.mangools.com/kwfinder
- Sold by: Mangools (https://mangools.com)
- Checked: 2026-10-29

## In the answer

- Completeness: 83%
- Search volume: ✓
- Monthly trend: ✓
- Cost per click: ✓
- Competition: ✓
- Keyword difficulty: ✓

## Price

- $ per 1,000 keywords: $0.00
- Per: page of 15
- Billing: free

## Charges

- Repeat free: 24 hours
- Also pays for: from the same budget: Get details for a set of keywords · Get list of keywords for domain or URL · Get suggested keywords for URL · Keyword Gap Analysis

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Start with a seed keyword and get up to 700 related keyword ideas, sorted by relevance. Each keyword can include essential metrics such as search volume, CPC, PPC, keyword difficulty (cached), and search volume history.

## Data

- Keep data: no limit
- Use data: a limited, non-exclusive, non-transferable, non-sublicensable, revocable license to access and use IP solely for your internal business purposes (or personal purposes for individual consumers) during your subscription term [...] You must not, and must not permit any third party to: copy, modify, or create derivative works of IP, reverse engineer, decompile, or disassemble IP, rent, lease, lend, sell, sublicense, or transfer IP, remove or obscure any proprietary notices on IP, use IP to develop competing products or services [...] you acknowledge that all data obtained based on License remains the intellectual property of Mangools, and agree to attribute URL Rating and Mangools in any publication or distribution of said data

## Plan

- Pay: $0
- You get: 5 requests a day
- Enough for: 5 pages a day

## Rate limit

- Per second: 0.1
- Batch: 1

## Speed

- Median: 6.68 s

## The call

- You send: kw. Optional: location_id, language_id
- Method: GET
- Path: /kwfinder/related-keywords

## About the plan

- Plan: Free
- Who can get it: anyone of legal age to form a binding contract

## The 19 fields the plan's answer can hold

keyword ID, keyword, location ID, search volume, search volume source, normalized search volume, monthly searches, cost per click, competition, keyword difficulty, keyword difficulty updated at, updated at, language ID, language code, language label, location label, country code, total keywords, suggestion source

## Mangools's plans (11)

- [Mangools, free](https://datacircle.dev/related-keywords-apis/mangools/free/llms.txt): $0.00 per 1,000, 83% complete
- [Mangools, $5 monthly](https://datacircle.dev/related-keywords-apis/mangools/5-monthly/llms.txt): $0.0083 per 1,000, 83% complete
- [Mangools, $15 monthly](https://datacircle.dev/related-keywords-apis/mangools/15-monthly/llms.txt): $0.0001 per 1,000, 83% complete
- [Mangools, $30.50 monthly](https://datacircle.dev/related-keywords-apis/mangools/30-50-monthly/llms.txt): $0.051 per 1,000, 83% complete
- [Mangools, $40.50 monthly](https://datacircle.dev/related-keywords-apis/mangools/40-50-monthly/llms.txt): $0.0039 per 1,000, 83% complete
- [Mangools, $70.50 monthly](https://datacircle.dev/related-keywords-apis/mangools/70-50-monthly/llms.txt): $0.0028 per 1,000, 83% complete
- [Mangools, $39 yearly](https://datacircle.dev/related-keywords-apis/mangools/39-yearly/llms.txt): $0.0053 per 1,000, 83% complete
- [Mangools, $117 yearly](https://datacircle.dev/related-keywords-apis/mangools/117-yearly/llms.txt): $0.000064 per 1,000, 83% complete
- [Mangools, $226.20 yearly](https://datacircle.dev/related-keywords-apis/mangools/226-20-yearly/llms.txt): $0.031 per 1,000, 83% complete
- [Mangools, $316.20 yearly](https://datacircle.dev/related-keywords-apis/mangools/316-20-yearly/llms.txt): $0.0025 per 1,000, 83% complete
- [Mangools, $586.20 yearly](https://datacircle.dev/related-keywords-apis/mangools/586-20-yearly/llms.txt): $0.0019 per 1,000, 83% complete

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

- `GET /kwfinder/related-keywords`: [Mangools, free](https://datacircle.dev/related-keywords-apis/mangools/free/llms.txt)

## Mangools's APIs (4)

- [Mangools: SERP API pricing, 11 plans](https://datacircle.dev/serp-apis/mangools/free/llms.txt)
- [Mangools: keyword research API pricing, 11 plans](https://datacircle.dev/keyword-research-apis/mangools/free/llms.txt)
- [Mangools: ranked keywords API pricing, 11 plans](https://datacircle.dev/ranked-keywords-apis/mangools/free/llms.txt)
- [Mangools: related keywords API pricing, 11 plans](https://datacircle.dev/related-keywords-apis/mangools/free/llms.txt)

## Mangools: related keywords API alternatives

- [RankParse, $108 yearly](https://datacircle.dev/related-keywords-apis/rankparse/108-yearly/llms.txt): $0.003 per 1,000, 50% complete
- [DataForSEO, top-up from $50, Pay as you go, POST /v3/keywords_data/google_ads/keywords_for_keywords/live](https://datacircle.dev/related-keywords-apis/dataforseo/top-up-from-50-pay-as-you-go-post-v3-keywords-data-google-ads-keywords-for-keywords-live/llms.txt): $0.0045 per 1,000, 67% complete, live
- [KeywordTool.io, $816 yearly, Starter (annual), GET /v2/search/suggestions/bing](https://datacircle.dev/related-keywords-apis/keywordtool-io/816-yearly-starter-annual-get-v2-search-suggestions-bing/llms.txt): $0.045 per 1,000, 67% complete
- [AnyAPI, pay as you go, Pay per call with x402 and MPP, POST /v1/run/seo.related_keywords](https://datacircle.dev/related-keywords-apis/anyapi/pay-as-you-go-pay-per-call-with-x402-and-mpp-post-v1-run-seo-related-keywords/llms.txt): $0.16 per 1,000, 100% complete, 1 month

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-29.

- https://api.mangools.com/v3/openapi.json
- https://apidocs.mangools.com/kwfinder
- https://apidocs.mangools.com/rate-limits
- https://mangools.com/api
- https://mangools.com/api/keyword-research-api
- https://mangools.com/conditions
- https://mangools.com/kwfinder
- https://mangools.com/plans-and-pricing
- https://mangools.com/plans.json?platform=api
- https://mangools.com/plans.json?platform=combo