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SE Ranking pricing and alternatives: related keywords API, GET /v1/keywords/similar

SE Ranking's sitellms.txtBest related keywords API in 2026

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83% complete: 5 of the 6 key fields we checkSee the 6 fields
$0.00per 1,000 keywordsWe rank 53 plans by price. Mangools's $15 monthly plan 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, DataForSEO and SE Ranking are the best related keywords API providers in our benchmark.
Plan: Free trial one of SE Ranking's 6 plans
Call: GET /v1/keywords/similar one of SE Ranking's 3 calls for this API
API: Related keywords API one of SE Ranking's 5 APIs

About this item

  • A copy at most 1 month old. You get keyword data from SE Ranking's database.
  • 5 of the 6 key fields we check. Search volume, Monthly trend, Cost per click, Competition, Keyword difficulty.
  • Nothing to pay. You get 100,000 credits once, enough for 10,000 results. Calls stop once your credits run out. Unused credits expire after 14 days.
  • One call. You send source and keyword to GET /v1/keywords/similar. The call returns keywords like the one you send.
  • Who can get it: anyone who confirms an email address, a direct competitor of SE Ranking excepted. Keep data: no limit. Use data: with conditions.

SE Ranking: related keywords API alternatives

The table starts with SE Ranking's cheapest paid plan. Next come plans from other providers with the price per 1,000 keywords closest to SE Ranking's. Each plan in the table gives live data or data at most a month old.

SE Ranking, $29 monthly, Add-on, monthly billing, GET /v1/keywords/similarDataForSEO, top-up from $50, Pay as you go, POST /v3/dataforseo_labs/google/related_keywords/liveAnyAPI, top-up from $10, Manual top-up, POST /v1/run/seo.related_keywordsSpyFu, $119 monthly, Pro + AI, GET /apis/keyword_api/v2/related/getRelatedKeywords
$ per 1,000 keywords$1.933$0.12$0.16$2.50
Completeness83%100%100%33%
Billingmonthlypay firstpay firstmonthly
Pay$29$50$10$119
Enough for15,000 results a monthabout 416,666 results62,500 results16,000 results a month
Freshness1 month1 month1 month1 month
Who can get itcustomers with an SE Ranking Core, Growth or Enterprise subscriptionanyone not in Russia, Belarus, Cuba, Iran, Syria, Myanmar, North Korea or Russian-occupied Ukraineanyone 18 or over, for business or professional use, not in an embargoed jurisdiction or on a restricted-party listanyone

Every related keywords API provider we score, ranked

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.

  1. help.seranking.com/hc/en-us/articles/21487397355420-API-pricing
  2. seranking.com/api-pricing.html
  3. seranking.com/api/api-credits-system
  4. seranking.com/api/data/keyword-research/
  5. seranking.com/api/rate-limits
  6. seranking.com/api/usage-guidelines-for-commercial-purposes
  7. seranking.com/legal/api-terms-of-service.html

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Search volume
  • Monthly trend
  • Cost per click
  • Competition
  • Keyword difficulty
  • Search intent, not in the answer
Price
$ per 1,000 keywords$0.00
Perresult
Billingfree
Charges
Also pays forfrom the same budget: Backlinks API · Domain Research API · Keyword Research API · Website Audit API · AI Search API
Overage
Units caphard
Not found
$ per 1,000$0.00
In their words
Their pitchRetrieves keywords similar to a specified seed keyword within a regional database. Semantically similar keywords include synonyms, close variations, or different phrasings with the same intent. The method returns metrics such as search volume, CPC, competition, keyword difficulty, search intent, and historical trends.
Data
Freshness1 month
Keep datano limit
Use dataCustomer may use the data obtained through the Provider API for commercial purposes, including internal analytics, client SEO audits, or reporting, provided such use complies with this Agreement and does not fall under the restricted use cases outlined below. [...] Any access to or use of the Provider API by a direct competitor of SE Ranking requires Provider’s explicit written consent. [...] The following use cases require Provider’s prior written consent: (1) Embedding raw or substantially similar API metrics inside a paid SaaS product, including white-label dashboards, API-based widgets, or multi-tenant products, (2) Reselling, sublicensing, or bulk redistribution of API data, including data-as-a-service offerings, data feeds, or mirroring Provider’s datasets or databases, (3) Use of API data to train public machine learning or language models.
Plan
Pay$0
You get100,000 credits
Enough for10,000 results, once
Expires14 days
Rate limit
Per second1
Batch1
Speed
Median0.70 s
The call
You sendsource, keyword. Optional: limit, offset, sort, sort_order, history_trend, filter[volume][from], filter[volume][to], filter[difficulty][from], filter[difficulty][to], filter[cpc][from], filter[cpc][to], filter[competition][from], filter[competition][to], filter[keyword_count][from], filter[keyword_count][to], filter[characters_count][from], filter[characters_count][to], filter[serp_features], filter[intents], filter[multi_keyword_included], filter[multi_keyword_excluded]
MethodGET
Path/v1/keywords/similar
About the plan
PlanFree trial
Who can get itanyone who confirms an email address, a direct competitor of SE Ranking excepted
The 9 fields the plan's answer can hold

total results, keyword, search volume, cost per click, keyword difficulty, competition, search intent, SERP features, search volume trend

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