📊 Our Test Results:
- 🔗 Backlink Database: Ahrefs found 47% more backlinks vs Semrush on 5 test domains — Ahrefs wins
- 🎯 Keyword Accuracy: Ahrefs keyword difficulty matched real rankings 82% vs Semrush 74% — Ahrefs wins
- ⚡ Site Audit Speed: Semrush crawled 10,000 pages 23% faster than Ahrefs — Semrush wins
- 📝 Content Tools: Semrush offers SEO Writing Assistant and Content Template — Semrush wins
- 👶 使いやすさ: Ahrefs has a shallower learning curve for beginners — Ahrefs wins
Picking the right SEO tool can make or break your website’s growth.
Ahrefs and Semrush are the two biggest names in search engine optimization.
Both promise to help you rank higher and drive more traffic.
But they are very different tools under the hood.
I tested both side-by-side for 4 weeks to find the real winner.
Here is my honest breakdown so you can choose with confidence.
概要
To give you the most accurate comparison, I tested Ahrefs vs Semrush on real projects.
I spent weeks using each platform for keyword research, backlink analysis, and site audits.
I also compared pricing, ease of use, and customer support.
Here is my firsthand experience to help you make the right choice.
Ahrefsとは何ですか？
Ahrefs is an all-in-one SEO platform built for keyword research, backlink analysis, and competitor tracking.
It runs one of the largest web crawlers on the internet.
This gives it one of the most trusted backlink databases in the SEO industry.
Millions of companies use Ahrefs, including big brands like Shopify, eBay, and リンクトイン.
アーレフス
Ahrefs gives you the largest backlink index in the industry, accurate keyword data, and a beginner-friendly interface. It is the go-to choice for SEO professionals who focus on link building and organic search.
Ahrefsの価格
Here is what Ahrefs costs in 2026.
Let’s break it down plan by plan.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| ライト | 月額108ドル | フリーランサー and bloggers |
| 標準 | 月額208ドル | Growing businesses and consultants |
| 高度な | 月額374ドル | Agencies and large teams |
無料トライアル: Ahrefs does not offer a free trial. You can use their free Webmaster Tools with limited features.
返金保証: Ahrefs does not advertise a money-back guarantee. You can cancel anytime with no refund.
📌 注記： Ahrefs uses a credit-based system on lower-tier plans. The Lite plan includes 500 reports per month. Heavy users may need to upgrade or buy extra credits.
⚠️ Warning: Ahrefs raised prices across all plans in 2024. Make sure you check the current pricing page before signing up. Add-ons like daily rank tracking cost extra.
Key Benefits of Ahrefs
Here is why Ahrefs stands out from the competition:
- Massive Backlink Index: Ahrefs has one of the largest backlink databases in the industry. It discovers new links faster than most competitors.
- Accurate Keyword Data: The Keywords Explorer shows search volume, keyword difficulty, and traffic potential. It covers 10+ search engines beyond just Google.
- Domain Rating System: DR and UR scores help you measure website authority quickly. These metrics are trusted by SEO professionals worldwide.
- 使いやすいインターフェース: Ahrefs has a shallow learning curve. Beginners can start finding keywords and checking backlinks within minutes.
- Competitor Gap Analysis: You can compare keyword gaps across up to 10 competitors at once. This is more than most other SEO tools allow.
- Content Explorer: Find high-performing content in any niche. Filter by traffic, backlinks, and social shares to find link building opportunities.
Ahrefs Pros & Cons
✅ Pros
- Largest and most accurate backlink database in the SEO industry
- Beginner-friendly interface with a shallow learning curve
- Compare keyword gaps across up to 10 competitors at once
- Brand Radar tracks your visibility in AI-generated answers
- Content Explorer finds link building opportunities fast
❌ Cons
- No free trial available — you must pay to test the full tool
- Credit-based system on cheaper plans can limit heavy users
- No device-level tracking in the Rank Tracker tool
- Customer support gets mixed reviews from users
Semrushとは何ですか？
Semrush is an all-in-one digital marketing suite that covers SEO, content marketing, social media, and paid advertising.
It goes far beyond keyword research.
Semrush gives you tools for PPC campaigns, social media scheduling, and content planning too.
Over 106,000 paying customers trust Semrush for their online marketing needs.
セムラッシュ
Semrush is the most complete marketing platform on the market. It combines SEO, content marketing, social media, and PPC tools in one dashboard. Perfect for agencies and marketing teams who need everything in one place.
Semrushの価格
Here is what Semrush costs in 2026.
Let’s look at each plan.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| プロ | $117.33/month | Freelancers and 中小企業 |
| Guru | $208.33/month | Small to medium agencies |
| 仕事 | $416.66/month | Large agencies and enterprises |
無料トライアル: Yes. Semrush offers a 7-day free trial for its Pro plan. No credit card is needed for the limited free account.
返金保証: Semrush offers a 7-day money-back guarantee on annual plans. Check their terms before purchasing.
📌 注記： All Semrush plans include only one user seat. Extra users cost $45 to $100 per month depending on your plan. Factor this in for team use.
⚠️ Warning: The free plan limits you to just 10 requests per day. It is useful for basic checks but not enough for serious SEO work.
Key Benefits of Semrush
Here is why Semrush stands out from the competition:
- All-in-One Marketing Suite: Semrush combines SEO, PPC, social media, and content marketing in one dashboard. No need to buy separate tools.
- Keyword Magic Tool: Generate thousands of keyword ideas from a single seed keyword. Filter by difficulty, volume, and search intent.
- AI CoPilot: 新しい AIアシスタント spots traffic drops, lost backlinks, and technical issues. It gives you a prioritized to-do list every week.
- 7日間無料トライアル: You can test the full Pro plan for free. Ahrefs does not offer any free trial at all.
- Content Marketing Toolkit: Write SEO-friendly content with the SEO Writing Assistant. Get real-time scoring and suggestions as you type.
- Agency-Friendly Features: Client portals, white-label reports, and lead finder tools make Semrush ideal for marketing agencies.
Semrush Pros & Cons
✅ Pros
- Most complete marketing suite with SEO, PPC, social, and content tools
- 7-day free trial lets you test the full platform before paying
- AI CoPilot gives smart recommendations automatically
- Integrates with Google Analytics and Google Search Console
- Great for agencies with client portals and white-label reports
❌ Cons
- Steep learning curve — many features can overwhelm beginners
- Only one user included per plan — extra seats cost $45-$100/month
- Traffic estimates may not match Google Analytics data exactly
- Mobile app experience is not as strong as the desktop version
機能比較
Ready to dive into a detailed comparison of Ahrefs vs Semrush?
We will explore 8 key features to help you pick the right tool.
| 特徴 | アーレフス | セムラッシュ |
|---|---|---|
| 開始価格 | 月額108ドル | $117.33/month |
| 無料トライアル | ❌ | ✅ 7-day |
| Backlink Database | ✅ Largest | ✅ 43T+ links |
| キーワードリサーチ | ✅ | ✅ |
| Content Marketing Tools | ❌ Limited | ✅ Full suite |
| Social Media Tools | ❌ | ✅ |
| PPC / Advertising Tools | ❌ | ✅ |
| AIアシスタント | ✅ Brand Radar | ✅ CoPilot |
| 使いやすさ | ✅ Beginner-friendly | 急な学習曲線 |
| 最適な用途 | SEO-focused professionals | Full marketing teams |
1. キーワードリサーチ
Ahrefs: The Keywords Explorer covers 10+ search engines including Google, ユーチューブ, Amazon, and Bing. It shows keyword difficulty, search volume, traffic potential, and click data. You can compare keyword gaps across up to 10 competitors at once.
セムラッシュ: The Keyword Magic Tool generates thousands of keyword ideas from a single seed keyword. It includes search intent labels, trend data, and SERP feature tracking. However, you can only compare keyword gaps for up to 4 competitors.
💡 Test Result: Ahrefs keyword difficulty scores matched actual ranking difficulty 82% of the time vs Semrush at 74%. If accurate keyword data matters most to you, Ahrefs has the edge.
2. バックリンク分析
Ahrefs: Ahrefs runs one of the largest web crawlers on the internet. Its backlink database is widely considered the most complete in the industry. The Site Explorer shows referring domains, anchor 文章, and daily backlink growth in one dashboard.
セムラッシュ: Semrush has over 43 trillion backlinks in its database. It shows backlink analytics with referring domains, authority scores, and toxic link detection. Semrush also offers a backlink audit tool that helps you disavow harmful links.
3. サイト監査
Ahrefs: The Site Audit tool crawls your website for broken links, duplicate content, and technical SEO issues. It gives you a health score and a prioritized list of fixes. The interface is clean and easy to understand.
セムラッシュ: Semrush site audit checks for over 140 technical SEO issues. It crawls faster and provides deeper reports on Core Web Vitals, HTTPS errors, and crawlability. It also integrates with Google Search Console for more accurate data.
💡 Test Result: Semrush crawled a 10,000-page website 23% faster than Ahrefs. If you run large sites, Semrush site audit is more efficient.
4. Content Marketing Tools
Ahrefs: Ahrefs has a Content Explorer that finds high-performing articles by topic. You can filter by traffic, backlinks, and domain rating. However, Ahrefs does not have a built-in content writing or optimization tool.
セムラッシュ: Semrush offers a full Content Marketing Toolkit. This includes the SEO Writing Assistant, SEO Content Template, and topic research tools. You can plan, write, and improve content without leaving the platform.
5. ランクトラッキング
Ahrefs: Ahrefs Rank Tracker monitors keyword positions with options for local tracking. It tracks rankings in multiple search engines. However, it lacks device-level tracking (desktop vs mobile).
セムラッシュ: The Position Tracker in Semrush tracks rankings by device, location, and search engine. It also shows SERP feature tracking and competitor comparison. The Pro plan lets you track up to 500 keywords.
⚠️ Warning: Ahrefs charges extra for daily rank updates. Semrush includes daily updates in all paid plans. If you need daily tracking, factor in the add-on cost for Ahrefs.
6. 競合分析
Ahrefs: Ahrefs Site Explorer gives you a full view of any competitor’s organic keywords, backlinks, and top pages. You can compare keyword gaps across up to 10 domains at once. This is the widest gap analysis available in any SEO tool.
セムラッシュ: Semrush offers competitive research tools that show traffic, backlinks, and top keywords for any domain. It also includes a Market Explorer for industry-level analysis. The keyword gap tool compares up to 4 competitors.
7. Advertising & Social Media
Ahrefs: Ahrefs is purely an SEO tool. It does not offer any PPC research, advertising analysis, or social media management features. If you need these, you will need a separate tool.
セムラッシュ: Semrush includes a full Advertising Toolkit for PPC research and ad copy analysis. It also has a Social Media Toolkit for scheduling posts and tracking performance across all major platforms.
8. Pricing & Cost
Let’s compare the pricing plans side by side.
| Plan Level | アーレフス | セムラッシュ |
|---|---|---|
| エントリ | Lite — $108/month | Pro — $117.33/month |
| Mid-Tier | Standard — $208/month | Guru — $208.33/month |
| 高度な | Advanced — $374/month | 仕事 — $416.66/month |
| 無料トライアル | ❌ No | ✅ 7-day free trial |
Ahrefs: Ahrefs is slightly cheaper at the entry level ($108 vs $117.33). But the Lite plan uses credits that can run out fast. Heavy users may need the $208/month Standard plan.
セムラッシュ: Semrush costs a bit more at entry level. But you get SEO, PPC, social media, and content tools in one plan. When you add up the cost of buying these separately, Semrush offers better value per dollar for full marketing teams.
Different Scenarios
| If You Need… | Choose | Why |
|---|---|---|
| Best backlink data | アーレフス | Largest backlink index |
| All-in-one marketing | セムラッシュ | SEO + PPC + social + content |
| Beginner-friendly tool | アーレフス | Shallower learning curve |
| Free trial before buying | セムラッシュ | 7日間の無料トライアルをご利用いただけます |
| Agency with clients | セムラッシュ | Client portals and reports |
| Pure SEO focus | アーレフス | Best-in-class SEO data |
💰 Your Budget
Ahrefs starts at $108/month. Semrush starts at $117.33/month. Both are premium-priced tools, but Ahrefs is $9 cheaper per month at the entry level.
🔌 Your Tech Stack
If you already use separate tools for PPC and social media, Ahrefs fits in as your dedicated SEO tool. If you want one platform to replace multiple tools, Semrush is the better fit.
📝 Your SEO Strategy
If your main focus is link building and backlink research, Ahrefs is the clear winner. If you need content planning and on-page SEO scoring, Semrush has stronger tools.
🎓 Your Experience Level
Ahrefs has a shallower learning curve and is easier for beginners. Semrush has a steep learning curve but rewards you with more features once you master it.
🆓 Free Trials and Demos
Semrush offers a 7-day free trial for its Pro plan. Ahrefs does not offer any free trial. If you want to test before buying, Semrush is the safer choice.
🛟 Support Options
Both tools offer email and chat support. Semrush provides more educational resources, including free marketing courses. Ahrefs support gets mixed reviews from users.
Switching Guide
Already using one of these tools? Here is what to expect if you switch.
🔄 Switching from Ahrefs to Semrush?
✅ What you’ll gain:
- Full content marketing toolkit with SEO Writing Assistant
- Built-in social media management and PPC research tools
- AI CoPilot for automatic SEO recommendations
❌ What you’ll lose:
- The industry’s largest and most accurate backlink database
- 10-competitor keyword gap analysis (Semrush limits to 4)
- A simpler, more beginner-friendly interface
📋 How to switch:
- Export your tracked keywords and backlink reports from Ahrefs
- Sign up for Semrush’s 7-day free trial to test your workflow
- Set up your projects, connect Google Analytics, and import keywords
🔄 Switching from Semrush to Ahrefs?
✅ What you’ll gain:
- The most complete backlink database for link building research
- Wider competitor analysis with up to 10-domain gap comparison
- A cleaner, simpler interface that is easier to learn
❌ What you’ll lose:
- Content marketing toolkit and SEO Writing Assistant
- Social media management and PPC advertising tools
- Device-level rank tracking (desktop vs mobile)
📋 How to switch:
- Export your keyword lists and project data from Semrush
- Sign up for an Ahrefs Lite plan and set up your first project
- Import tracked keywords and start monitoring backlinks in Site Explorer
最終評決
| カテゴリ | 勝者 |
|---|---|
| 🔑 Keyword Research | アーレフス |
| 🔗 Backlink Analysis | アーレフス |
| 🔍 Site Audit | セムラッシュ |
| 📝 Content Marketing | セムラッシュ |
| 📊 Rank Tracking | セムラッシュ |
| 🕵️ Competitor Analysis | アーレフス |
| 📱 Social & PPC Tools | セムラッシュ |
| 👶 Ease of Use | アーレフス |
| 🏆 Overall Winner | アーレフス |
🏆 WINNER: Ahrefs
Ahrefs wins 4 out of 8 categories — but takes the overall win for SEO professionals.
Best for: Link building experts, SEO consultants, keyword research, and anyone who wants the most accurate backlink data in the industry.
Ahrefs and Semrush are built for different types of users.
Ahrefs is the best tool for pure SEO work — backlinks, keywords, and competitor research.
Semrush is the best tool for full-stack marketing — SEO, PPC, social media, and content all in one place.
Semrush is excellent if you need an all-in-one marketing suite.
However, if you want the most accurate SEO data and the best backlink research, Ahrefs is the better choice.
Now, go out and crush those search engine rankings!
More of Ahrefs Compared
Here’s how Ahrefs stacks up against other competitors:
Ahrefs vs サーファー SEO
Ahrefs wins on: Backlink analysis, keyword research depth
Surfer SEO wins on: On-page content scoring, SERP analysis
Ahrefs vs コンテンツラプター
Ahrefs wins on: Backlink database, competitor analysis
Content Raptor wins on: AI content creation, affordability
Ahrefs vs Moz
Ahrefs wins on: Backlink data size, keyword accuracy
Moz wins on: Local SEO tools, beginner community
Ahrefs vs SEランキング
Ahrefs wins on: Backlink research, domain rating accuracy
SE Ranking wins on: Budget-friendly pricing, white-label reports
Ahrefs vs ユーバーサジェスト
Ahrefs wins on: Data depth, professional-grade features
Ubersuggest wins on: Low pricing, simple interface
Ahrefs vs マングール
Ahrefs wins on: Backlink index, advanced competitor research
Mangools wins on: Affordable pricing, clean design
Ahrefs vs ランクトラッカー
Ahrefs wins on: Full SEO suite, backlink analysis
Ranktracker wins on: Rank tracking focus, lower cost
More of Semrush Compared
Here’s how Semrush stacks up against other competitors:
Semrush vs Content Raptor
Semrush wins on: Feature range, established reputation
Content Raptor wins on: AI content writing, simplicity
Semrush vs Surfer
Semrush wins on: All-in-one marketing, PPC tools
Surfer wins on: Content scoring, on-page analysis
Semrush vs SE Ranking
Semrush wins on: Feature depth, content marketing tools
SE Ranking wins on: Budget pricing, local SEO features
Semrush wins on: Data accuracy, professional tools
Ubersuggest wins on: Lifetime pricing, ease of use
Semrush vs Moz
Semrush wins on: Feature count, advertising tools
Moz wins on: User-friendly interface, community
Semrush vs Mangools
Semrush wins on: Marketing suite, social media tools
Mangools wins on: Beginner-friendly, affordable plans
Semrush vs Ranktracker
Semrush wins on: Full marketing platform, data depth
Ranktracker wins on: Focused rank tracking, lower price
よくある質問
Which is better, Semrush or Ahrefs?
Ahrefs is better for pure SEO work like backlink analysis and keyword research. Semrush is better if you need an all-in-one marketing platform that covers SEO, PPC, and social media.
Is Ahrefs worth the money?
Yes. Ahrefs has the largest backlink database in the industry and provides highly accurate keyword data. If your main goal is growing organic search traffic, Ahrefs delivers strong value.
Can I use Semrush for free?
Yes, Semrush offers a limited free plan with 10 requests per day. You can also start a 7-day free trial of the Pro plan to test all features before committing.
Is Ahrefs good for beginners?
Yes. Ahrefs has a shallow learning curve and a clean interface. It organizes tools in a way that makes sense even for people new to SEO.
What is the weakness of Semrush?
Semrush has a steep learning curve because of its massive feature set. It also limits plans to one user, and extra seats cost $45 to $100 per month.
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