Keyword Difficulty Checker
Estimate how hard it is to rank for a keyword — based on real Google SERP data and domain authority signals.
- Go to searchapi.io and click Sign up
- Register with your email — no credit card needed for the free plan
- Go to Dashboard → API Key and copy your key
- Paste below — saved in your browser so you only do this once
How the score works
The KD score (0–100) is based on three signals from the top results: average Open PageRank of ranking domains, number of high-authority domains (OPR ≥ 7), and presence of major brands (Wikipedia, Reddit, Amazon, etc.). Paid ads also add to the score as a commercial competition signal.
Score ranges
0–14 Very Easy — new sites can compete.
15–34 Easy — good target for sites under 6 months.
35–59 Medium — established sites with content strategy.
60–79 Hard — need strong backlinks and authority.
80–100 Very Hard — major brands dominate, avoid without authority.
Open PageRank explained
Open PageRank is a free, open alternative to Moz DA and Ahrefs DR. Scored 0–10, it measures a domain's link authority. OPR 0–3 = low authority (easy to beat). OPR 4–6 = moderate. OPR 7–10 = very strong (Wikipedia, BBC, Forbes level). Without an OPR key the score is estimated from brand signals only.
What to do with this data
Look at the individual results, not just the score. If 3 of the top 10 are Reddit threads and forum posts, the real competition is low even if the score is medium. If Wikipedia is #1 and Forbes is #2, that's a real signal of difficulty. Always scan the actual SERP before committing to a keyword.
Limitations
This tool estimates difficulty from authority signals — it doesn't have real search volume data. Always combine KD scores with volume data from Google Keyword Planner, Ahrefs, or Semrush. A keyword scoring 20 with 50 monthly searches isn't worth targeting — a keyword scoring 40 with 5,000 searches might be.
Finding opportunities
The sweet spot is medium difficulty with decent volume. Look for keywords where the top results include forums, thin content, or outdated articles — these are gaps you can fill with better content. Check 5–10 related keywords to find the easiest entry point into a topic.