Ahrefs vs Semrush vs Moz (and Ubersuggest, SpyFu): Which SEO Tool? Plus Domain Authority Explained
- 1digiethic.com/blog/ahrefs-vs-semrush-vs-moz#1
Ahrefs vs Semrush vs Moz
- 2example.com
A national directory listing
- 3example.com
A competitor's old blog post
- 4example.com
A comparison site
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Quick answer
Semrush is the broadest all-in-one suite, covering SEO, PPC and competitor data. Ahrefs is strongest for backlinks and content research. Moz Pro is simpler for beginners, Ubersuggest is a cheap starting point, and SpyFu focuses on competitors' paid and organic keywords. Domain Authority, Domain Rating and Authority Score are each tool's own estimate. Google doesn't use any of them.
Key takeaways
- Pick by the main job: backlinks (Ahrefs), all-in-one plus PPC (Semrush), simplicity (Moz).
- DA, DR and Authority Score are comparison numbers, not Google ranking factors.
- A “good” authority score is one close to the sites you're competing with.
- Prices and limits change often. Check before you commit to a year.
Quick comparison
We use several of these every week. Here's how they compare in practice:
| Tool | Best for | Notable strengths |
|---|---|---|
| Semrush | All-in-one SEO + PPC | Keyword database, competitor and ad data, site audit, local tools |
| Ahrefs | Backlinks & content | Large link index, Site Explorer, Content Explorer |
| Moz Pro | Beginners, small teams | Simple UI, Domain Authority, keyword explorer |
| Ubersuggest | Budget users | Low cost, simple keyword ideas |
| SpyFu | Competitor PPC research | Competitors' ad history and keywords |
They overlap a lot. Most businesses need one paid suite at most, plus the free Google tools (best SEO tools). Paying for three is usually a sign nobody has decided which one to actually use.
Which should you choose?
- Local business: the free Google tools plus a local SEO tool. A big suite is optional.
- Content-led growth: Ahrefs or Semrush.
- SEO plus Google Ads: Semrush or SpyFu, for paid competitor data.
- Agency: one suite with client reporting built in.
If you're a small business owner, honestly, Search Console will teach you more about your site than any paid tool in the first few months.
Frequently asked questions
Is Ahrefs or Semrush better?
Neither is universally better, Ahrefs is often preferred for backlink research, Semrush for breadth across SEO, PPC and competitor data.
Does Google use Domain Authority?
No. DA is Moz's estimate; Google uses its own signals.
Is Ubersuggest good enough?
For basic keyword ideas on a small budget, yes; for serious competitor and link analysis, a larger suite is more reliable.
Sources
Platform rules change often, so we check sources at every update. Last reviewed October 12, 2026.
Written by
Zia Ur Rehman
Founder & Lead SEO Strategist, DigiEthic
Zia Ur Rehman is the founder of DigiEthic, with 14 years of experience in digital marketing. He works hands-on across technical SEO, AI search optimization (AEO/GEO), Local SEO, Google Ads and Meta Ads for service businesses and e-commerce brands.
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