Similarwebの代替（2026年）：深くテストされた7つの無料ツール
Similarwebの無料プランは事実上役に立たない - 月に5件の結果でトラフィック数が黒塗りされている。ここに、実際にデータを明らかにする7つの無料代替があります。埋め込みコード付き。
Why Similarweb's free tier doesn't cut it
Similarweb is the premium gold standard for competitive traffic intelligence. Their problem isn't accuracy — it's price. The free tier gives you 5 lookups per month and most metrics are blurred or hidden behind a paywall.
Their cheapest paid tier (Pro) starts at $199/month. Most SMBs and indie operators don't need $199/month of traffic intelligence — they need a quick "is this site bigger or smaller than mine?" answer.
The 7 free alternatives
1. FeedPulse Rank — best free overall
FeedPulse Rank gives you a global rank for any domain, embeddable badge included, unlimited free checks. Doesn't show monthly visit estimates, but does show what most people actually want: "where does this domain sit globally?"
2. OpenPageRank — best for bulk lookups
OpenPageRank offers unlimited free rank + 0-10 DR-equivalent score via their API. Great for bulk competitive analysis. No public-facing tool though — you have to write the code.
3. SimilarWeb Free (the actual free tier)
Similarweb.com's public site does give you a rank + rough monthly visits estimate for any domain — 5 per month before the wall.
4. Moz Link Explorer (free 10/mo)
Moz gives Domain Authority + top backlinks for free — 10 lookups/month with a free account. Or use our DA checker for unlimited free DA without an account.
5. Ubersuggest (free 3/day)
Neil Patel's tool. 3 free queries per day. Shows traffic estimates + top organic keywords. The 3/day cap is the catch.
6. SEMrush Authority Score Checker (free)
Semrush's public Authority Score checker is genuinely free with no per-day cap. Shows authority score + organic traffic estimate.
7. SpyFu (free competitor lookup)
Best for organic keyword spy. Free tier limits you to 1 month of historical data.
Recommended combo for 90% of use cases
If you want one stop:
- Global rank? → FeedPulse Rank (free, unlimited, embeddable)
- Domain Authority? → FeedPulse DA Checker (free, unlimited)
- Domain Rating? → FeedPulse DR Checker (free, unlimited)
- Monthly visit estimate? → Similarweb free tier (5/mo cap)
- Top organic keywords? → Semrush authority-score page or Ubersuggest
Total cost: $0. Total signup forms: zero (for the FeedPulse tools).
What free tools cannot tell you
Be honest with yourself about the limits. No free tool gives you accurate per-page traffic data for someone else's site. All free traffic estimators are inferences from public signals (rank, search engine SERPs, social presence). For decision-grade traffic analytics on competitors, you do need a paid tier somewhere — Similarweb Pro, Semrush Pro, or Ahrefs Pro.