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Find website competitors

Given any website URL - yours or someone else's - here's the reverse-lookup playbook to find the competitors of that site across organic, paid, and creative channels.

Updated

Before you start

  • The exact URL of the website you want to find competitors for (yours, a client's, a target's)
  • Access to one SEO tool: Ahrefs, SEMrush, SpyFu, Mangools, or Ubersuggest
  • SimilarWeb account (free tier works for basic lookups)
  • 30 minutes for the first reverse lookup

The playbook

7 steps

0/7

  1. Drop the URL into SimilarWeb for instant competitor suggestions

    similarweb.com -> paste URL -> hit search. The free tier returns 'Similar Websites' - a list of 5-10 sites SimilarWeb's algorithm scores as competitors based on shared audience overlap, traffic source similarity, and topical relevance. This is the fastest single-step competitor discovery for any URL.

    TipSimilarWeb's 'Similar Websites' algorithm leans toward sites with similar audiences. For a SaaS-focused alternative lens, also check the next steps - audience-similar isn't always SEO-similar.

    Expected outcome

    5-10 algorithmically-suggested competitors based on audience and traffic similarity.

  2. Run Ahrefs Organic Competitors for SEO-focused competition

    Ahrefs Site Explorer -> paste URL -> Organic Competitors. Ahrefs ranks domains by Common Keywords - the more keywords two domains both rank for, the higher the competitor score. Top 10 results are the algorithmically-identified SEO competitors. Often differs from SimilarWeb's audience-based list - both are useful, neither is complete on its own.

    Expected outcome

    10 SEO competitors ranked by keyword overlap score.

  3. Run SEMrush Competitors for cross-validation

    SEMrush Domain Overview -> paste URL -> Competitors. SEMrush uses its own competitive positioning algorithm (Competitive Positioning Map plots competitors on traffic vs keyword overlap). Cross-check against Ahrefs. Domains appearing in both tools = high-confidence competitors. Domains in only one = lower-confidence but still worth investigating.

    Expected outcome

    Cross-validated list combining SimilarWeb + Ahrefs + SEMrush competitor suggestions.

  4. Sample the target's top 10 SEO keywords and check the SERPs

    Inside Ahrefs / SEMrush, pull the target URL's top 10 organic keywords by traffic. Manually search each in incognito. Note who else appears in the top 10 organic results. Domains appearing on 3+ of these SERPs are systematic SEO competitors. This is the ground-truth method - what the algorithms suggest vs who actually ranks alongside the target.

    # Quick incognito SERP check workflow
# 1. Open Ahrefs -> Top Keywords for target URL
# 2. Copy top 10 keywords
# 3. Open incognito browser
# 4. Search each keyword, capture top 10 results
# 5. Tally domains across the 100 results
# 6. 3+ appearances = systematic competitor

    Expected outcome

    Ground-truth competitor list based on actual SERP co-occurrence.

  5. Find paid competitors via SpyFu or SEMrush PPC research

    SpyFu Domain Overview -> Top Paid Competitors, or SEMrush Domain Overview -> Paid Search Competitors. Paid competitor lists are often different from organic competitor lists - some brands compete only in paid, others only in organic. For a complete competitor view, you need both channel lenses.

    Expected outcome

    Paid competitor list separate from organic - complete cross-channel competitive set.

  6. Identify creative competitors via ad libraries

    If the target runs Meta ads: facebook.com/ads/library -> search the target's brand name. Then for each top creative competitor candidate, check their Meta ad inventory too. Brands running ads in the same category, with similar offer structures, are creative competitors - regardless of whether they show up in SEO/paid tools.

    Expected outcome

    Creative competitor list based on Meta Ad Library overlap in the same category.

  7. Build a unified competitor map

    Combine SimilarWeb audience competitors + Ahrefs/SEMrush SEO competitors + paid competitors + creative competitors into a single matrix. Rows = competitor domains; columns = SimilarWeb / Ahrefs / SEMrush / Paid / Creative; cells = checkmark or rank. Domains checked in 3+ columns are the high-priority competitive set - they compete with the target across multiple channels simultaneously.

    # Unified competitor matrix
# domain     | SimilarWeb | Ahrefs SEO | SEMrush SEO | Paid | Creative
# comp1.com  |     ✓      |     ✓      |     ✓       |  ✓   |    ✓
# comp2.com  |     ✓      |     ✓      |             |      |    ✓
# comp3.com  |            |     ✓      |     ✓       |  ✓   |
# 4+ channel = integrated competitor (highest priority)

    Expected outcome

    Unified competitor matrix mapping every competitor across all five channel lenses.

Shuttergen

Found their competitors? Now ship faster than they do.

Reverse lookups reveal who competes for any given site. Shuttergen helps you outpace those competitors on creative volume - turning intelligence into shipped ads.

Generate creative freeMulti-channel competitor playbook →

Pitfalls

What goes wrong

  • Relying on one tool's competitor suggestions

    Each tool uses a different algorithm and produces a different competitor list. Single-tool reliance gives a single-tool view of competition. Always cross-validate across at least two tools plus manual SERP analysis.

  • Confusing audience overlap with competitive overlap

    SimilarWeb's 'Similar Websites' is audience-based. Two SaaS tools targeting CMOs may both appear in each other's Similar lists without competing on a single keyword or ad. Audience overlap is useful context, not a competitor definition.

  • Skipping the manual SERP check

    Algorithmic competitor lists are computed from broad keyword overlap. Your target's actual priority keywords may produce a different competitive set. The 15-minute manual SERP check on top 10 keywords corrects this.

  • Ignoring channel-specific competitors

    A brand competing only in Meta ads isn't on your SEO radar but they're winning audience attention. Don't filter your competitor map to 'overlap competitors only' - track channel-specific ones separately.

  • Running the lookup once and never re-running

    Competitive sets shift quarterly. A reverse lookup run in January is partially stale by July. For ongoing competitive monitoring, refresh quarterly minimum.

Limits

When this playbook won't work

  • The target URL is very small (under 5K monthly visits) - the data tools have insufficient signal to suggest competitors
  • The target is in a niche with no real competition (rare but happens in deep-vertical B2B)
  • The target operates in a non-English market where data tool coverage is thin
  • You're trying to find competitors for a brand-new site (under 6 months) - the algorithms need historical data to compute competitor scores

Why reverse competitor lookup is different from your own competitor discovery

Two common use cases: (1) you're analyzing your own site - the goal is competitive intelligence to inform your strategy; (2) you're analyzing someone else's site - the goal is usually due diligence, pitch research, or evaluating a potential acquisition. The methodology is the same; the use of the output differs.

For your own site, lean toward depth. You'll act on the output, so you need a small set of high-confidence competitors and the data behind each. 5-10 competitors with deep profiles beats 30 surface-level entries.

For someone else's site, often breadth matters more. If you're preparing a pitch or doing M&A diligence, the question is often 'what does the full competitive landscape look like?' rather than 'who are the top 5?'. Capture the longer tail, organize by tier (direct / adjacent / aspirational), and let the recipient zoom in.

Found their competitors? Now ship faster than they do. Reverse lookups reveal who competes for any given site. Shuttergen helps you outpace those competitors on creative volume - turning intelligence into shipped ads.

Generate creative free

Tool stack for reverse competitor lookup

SimilarWeb is the single-step tool. Free tier gives you immediate competitor suggestions for any URL. Most useful for audience-based competitive lens. Paid tier ($199+/mo) for absolute numbers and deeper drill-down.

Ahrefs Site Explorer -> Organic Competitors is the SEO-focused lookup. Most useful when the target's growth is organic-led. Standard plan at $249/mo is the typical entry point.

SEMrush Domain Overview -> Competitors is roughly equivalent to Ahrefs. Pick by which platform you already pay for.

SpyFu Domain Overview for paid competitor discovery, particularly when budget is tight. $39/mo Basic plan is significantly cheaper than Ahrefs/SEMrush.

Mangools / Serpstat / Ubersuggest are budget alternatives. Usable for early-stage analysis; less polished than the big three.

Meta Ad Library + TikTok Creative Center (both free) for the creative competitor layer. Mandatory if the target runs ads.

Internal: find-competitors, find-seo-competitors, find-competitors-website.

FAQ

Frequently asked

How do I find competitors of a website?
Combine algorithmic tools (SimilarWeb, Ahrefs Organic Competitors, SEMrush Competitors) with manual SERP analysis on the target's top 10 keywords. Cross-validate across tools; domains appearing in 2+ tools are high-confidence competitors. Add paid and creative competitor lookups for a complete cross-channel map.
What's the best free tool to find competitors of a website?
SimilarWeb's free tier returns 5-10 'Similar Websites' for any URL based on audience and traffic overlap. Combine with manual SERP analysis on top keywords for free. For SEO depth, you'll outgrow the free tier quickly and need Ahrefs or SEMrush.
Can I find website competitors without paid tools?
Partially. SimilarWeb free + manual SERP analysis + Meta Ad Library covers basic discovery. For deep SEO competitive analysis, content gap, and backlink gap, paid tools are needed - there's no full free substitute.
How accurate are website competitor tools?
Each tool's competitor algorithm is different. Cross-validation matters - domains appearing in 2+ tools are high-confidence; single-tool suggestions are lower confidence. None of the tools are perfect; combined they're directional and useful.
How many competitors should I find for a website?
For your own site: 5-10 high-confidence competitors to deeply track. For pitch / M&A diligence on someone else's site: 15-30 with tier categorization (direct / adjacent / aspirational). The use case dictates the breadth.
Are SimilarWeb's 'Similar Websites' my real competitors?
Sometimes. SimilarWeb's algorithm leans toward audience overlap. Two sites can share an audience without competing for keywords or customers. Use SimilarWeb suggestions as one input, cross-validate against SEO and paid competitor tools, manually SERP-check on top keywords.
How often should I refresh my website competitor map?
Quarterly for active monitoring. Annually as a minimum. Competitive sets shift slowly but ignoring them for 12+ months means your map describes a market that no longer exists.

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Found their competitors? Now ship faster than they do.

Reverse lookups reveal who competes for any given site. Shuttergen helps you outpace those competitors on creative volume - turning intelligence into shipped ads.

Generate creative freeMulti-channel competitor playbook →