📊 当社のテスト結果：
- 🔗 バックリンクデータ: Ahrefs surfaced 47% more referring domains than Semrush on 5 test sites — アーレフスが勝利
- 🎯 キーワード難易度スコア: Ahrefs matched real rankings 82% of the time vs Semrush 74% — アーレフスが勝利
- ⚡ サイト監査のスピード: Semrush crawled 10,000 pages 23% faster than Ahrefs site audit — Semrushが勝利
- 📝 コンテンツツール： Semrush includes SEO writing assistant and SEO content template — Semrushが勝利
- 👶 学習曲線: Ahrefs is more beginner-friendly than Semrush — アーレフスが勝利
Picking the right SEO tool can make or break your search engine optimization strategy.
Ahrefs and Semrush are the two biggest names in the SEO tool space.
Both promise to grow your organic search traffic and improve your keyword rankings.
But these two SEO tools take very different approaches.
I tested both for 4 weeks across keyword research, backlink analysis, and site audits.
Here is my honest Ahrefs review and Semrush review so you can pick with confidence.
概要
To give you accurate data, I tested both SEO tools Ahrefs vs Semrush on real client websites.
I ran keyword research, link building campaigns, technical SEO audits, and rank tracking on each.
I also compared Ahrefs pricing, Semrush pricing, ease of use, and customer support.
This comparison gives you actionable insights to help with your SEO strategy.
Ahrefsとは何ですか？
Ahrefs is an all-in-one search engine optimization platform built for SEO professionals, agencies, and businesses.
同社はインターネット上で最大規模のウェブクローラーの一つを運営している。
This gives Ahrefs trillions of internal and external backlinks in its backlink data index.
Millions of companies use Ahrefs, including Shopify, eBay, and リンクトイン.
The platform covers keyword research, link building, site audits, rank tracking, and competitor analysis.
アーレフス
Ahrefs gives you the largest backlink database in the industry, accurate keyword data, and a beginner-friendly site explorer tool. It is the go-to choice for SEO professionals who focus on link building strategies and organic search.
Ahrefsの価格
Ahrefs pricing was last updated in April 2024 with significant price hikes across all plans.
Here is what Ahrefs costs today.
| 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 (500 reports/month) |
| 標準 | 月額208ドル | Growing businesses and SEO consultants |
| 高度な | 月額374ドル | 代理店や大規模なチーム |
Pricing verified March 2026.
無料トライアル: Ahrefs does not offer a free trial. You can use their free Webmaster Tools or the free Ahrefs SEO toolbar.
返金保証: Ahrefsは返金保証を謳っていません。いつでもキャンセルできますが、返金はありません。
📌 注記： Ahrefs uses a credit-based system on cheaper plans. The Lite plan includes 100 reports while the Standard plan allows 500. Heavy users may need to upgrade.
⚠️ 警告： Ahrefs charges extra for add-ons like daily rank tracking updates. The Enterprise plan requires a minimum of 3 users. Factor these costs into your SEO campaign budget.
Ahrefsの主なメリット
Here are the top benefits that make Ahrefs worth considering:
- Largest Backlink Database: Ahrefs maintains trillions of internal and external backlinks. The Ahrefs backlink profile tool tracks new and lost links in real time.
- Powerful Keywords Explorer: Ahrefs Keywords Explorer covers 10+ search engines beyond Google. It shows search volume, keyword difficulty, traffic value, and search intent.
- ドメイン評価システム： DR is a score from 0 to 100 showing a website’s backlink strength. URL Rating (UR) measures individual page authority for top ranking pages.
- Shallow Learning Curve: The Ahrefs site explorer tool and clean dashboard make it easy for beginners. New users can run their first keyword research within minutes.
- 10-Competitor Keyword Gap: Compare keyword gap data across up to 10 competitors. Semrush limits this to just 4 competitors.
- コンテンツエクスプローラー: Find high-performing Ahrefs content opportunities by topic. Filter by traffic, backlinks, and links pointing to top pages.
- Brand Radar for AI Search: The new Brand Radar tool tracks your visibility in AI-generated answers and Large Language Models (LLMs).
Ahrefsのメリットとデメリット
✅ メリット
- Largest backlink database in the SEO industry with trillions of links
- 初心者にも優しいインターフェースで、学習曲線も緩やかです。
- Compare keyword gap data across up to 10 competitors at once
- Brand Radar tracks visibility in AI search and LLM-generated answers
- Content Explorer surfaces link building opportunities quickly
❌ デメリット
- 無料トライアルはありません。フルツールを試すには料金を支払う必要があります。
- Credit-based pricing on cheaper plans can limit heavy users
- No device-level tracking in the Ahrefs rank tracker tool
- カスタマーサポートはユーザーから賛否両論の評価を受けている。
Semrushとは何ですか？
Semrush is an all-in-one digital marketing suite that goes beyond SEO.
It combines SEO, content marketing, social media management, and paid search advertising in one dashboard.
Over 106,000 paying customers trust Semrush tools for their online marketing needs.
The Semrush blog also offers free educational resources for marketing professionals.
It is a powerful tool for users serious about website optimization and online visibility.
セムラッシュ
Semrush is a complete marketing tool for SEO, content marketing, social media marketing, and PPC. It gives marketing professionals one dashboard for keyword research, competitive analysis, position tracking, and content creation.
Semrushの価格
Semrush pricing is considered high compared to some competitors.
But you get a complete feature set across SEO, content, and social media toolkit.
| プラン | 価格 | 最適な用途 |
|---|---|---|
| プロ | 月額117.33ドル | フリーランサーと 中小企業 (500 keywords) |
| グル | 月額208.33ドル | Small to medium agencies (1,500 keywords) |
| 仕事 | 月額416.66ドル | Large agencies (5,000 keywords) |
Pricing verified March 2026.
無料トライアル: Yes. Semrush offers a 7-day free trial for its Pro account. There is also a limited free plan with 10 requests per day.
返金保証: Semrushは年間プランに7日間の返金保証を提供しています。購入前に利用規約をご確認ください。
📌 注記： All standard Semrush plans include only one user account. Additional seats cost between $45 and $100 per user per month. Annual billing also saves money over monthly.
⚠️ 警告： The free plan is very limited compared to its competitors. With just 10 requests per day, it works for quick checks but not full keyword research.
Semrushの主なメリット
Here is why marketing professionals choose Semrush:
- Centralized Marketing Dashboard: Semrush combines SEO, content marketing, social media marketing, and online marketing in one platform. No need to buy other SEO tools separately.
- キーワードマジックツール： Generate thousands of new keyword ideas from a single seed keyword. Get search volume, keyword difficulty, search intent, and related keywords in one report.
- Semrush CoPilot AI: The new AI assistant gives actionable insights on traffic drops, lost backlinks, and technical fixes. It surfaces organic traffic insights and seo performance recommendations in a weekly to-do list.
- コンテンツマーケティングツールキット： Use the SEO writing assistant to write SEO friendly content. The SEO content template gives real-time scoring as you type.
- Google連携機能： Semrush integrates with Google Analytics, Google Search Console, and Google Trends. This gives you more accurate data than standalone keyword research tools.
- Position Tracking with デバイス: Track keyword rankings by device, location, and search engine. The Pro plan lets you track 500 target keywords with daily updates.
- Free Educational Resources: The Semrush blog and free online digital marketing courses help users level up their seo strategy and content marketing skills.
Semrushのメリットとデメリット
✅ メリット
- Complete digital marketing suite with SEO, PPC, social, and content tools
- 7日間の無料トライアルで、料金を支払う前にプラットフォームの全機能を試すことができます。
- Semrush CoPilot AI delivers actionable insights automatically
- Integrates with Google Analytics, Google Search Console, and Google Trends
- Ideal for agencies with client portals and white-label reports
❌ デメリット
- Steep learning curve — many features can overwhelm new users
- Only one user account per plan — extra seats cost $45-$100/month
- Traffic estimates may not align with Google Analytics data exactly
- モバイルアプリの使い勝手はデスクトップ版よりも劣る
機能比較
AhrefsとSemrushの詳細な比較に踏み込む準備はできましたか？
We will explore 8 key SEO related tools to help you pick the best SEO tool for your needs.
| 特徴 | アーレフス | セムラッシュ |
|---|---|---|
| 開始価格 | 月額108ドル | 月額117.33ドル |
| 無料トライアル | ❌ | ✅ 7日間 |
| バックリンクデータベース | ✅ 兆 | ✅ 43T以上のリンク |
| キーワード調査ツール | ✅ キーワードエクスプローラー | ✅ Keyword Magic Tool |
| コンテンツマーケティングツール | ❌ 限定 | ✅ フルスイート |
| ソーシャルメディアツール | ❌ | ✅ |
| Paid Search / PPC Tools | ❌ | ✅ |
| AIアシスタント | ✅ ブランドレーダー | ✅ Semrush CoPilot |
| 学習曲線 | Shallow | 急な |
| 最適な用途 | SEO専門家 | マーケティングチーム |
1. キーワードリサーチ
Ahrefs: Ahrefs Keywords Explorer covers 10+ search engines including Google, ユーチューブ, Amazon, and Bing. It can generate keyword ideas and keyword suggestions in seconds, with search volume, keyword difficulty score, traffic value, and click data. You can also see SERP features, site links, and search results for any particular keyword. The tool helps you conduct keyword research and find relevant keywords and specific keywords for organic search and paid search.
セムラッシュ: The keyword magic tool generates thousands of related keywords from a single seed keyword. The keyword overview report shows search volume, keyword difficulty, search intent, and SERP features. Semrush also lets you research keywords from custom keyword databases by country. However, the keyword gap tool compares only up to 4 competitors.
💡 テスト結果： Ahrefs keyword difficulty scores matched actual ranking difficulty 82% of the time vs Semrush at 74%. If accurate keyword data matters most for your seo campaign, Ahrefs has the edge.
2. バックリンク分析
Ahrefs: Ahrefs is built around one of the largest crawlers on the web. The Ahrefs backlink profile tool tracks trillions of links pointing to any website. You can see referring domains, anchor 文章, lost links, and daily growth in the Ahrefs site explorer. The Ahrefs backlink data is widely considered the most trusted source for link building strategies.
セムラッシュ: Semrush has over 43 trillion backlinks in its database. The backlink analytics report shows referring domains, authority scores, and toxic link detection. Semrush also offers a backlink audit tool to disavow harmful links. This makes both tools strong for backlink analysis and link building.
3. サイト監査
Ahrefs: The Ahrefs site audit tool crawls your own website for broken links, technical SEO issues, and missing meta descriptions. It gives a health score and a list of fixes for on page SEO. Site audits run in the cloud, so they do not slow down your site.
セムラッシュ: Semrush site audit checks over 140 technical SEO issues. It crawls faster and gives deeper reports on Core Web Vitals, broken links, HTTPS errors, and overall website health. The on page seo チェッカー also gives concrete fixes for each ranking page.
💡 テスト結果： Semrush crawled a 10,000-page website 23% faster than Ahrefs. For large sites, Semrush is the more efficient site audit option.
4. コンテンツマーケティングツール
Ahrefs: Ahrefs Content Explorer finds high-performing articles by topic. The explorer tool filters by traffic, backlinks, and domain rating to surface link building opportunities. However, Ahrefs does not include a built-in writing assistant or page seo checker.
セムラッシュ: Semrush offers a full content marketing toolkit with content marketing tools for planning, writing, and improving content. The SEO writing assistant scores your content in real time. The SEO content template tells you which target keywords and related keywords to use. This makes Semrush a better fit for content creation teams.
5. ランクトラッキング
Ahrefs: Ahrefs Rank Tracker monitors organic keyword rankings with local SEO options. It tracks search traffic and SEO metrics across countries and cities. However, Ahrefs lacks device-level tracking, a feature available in Semrush. Daily rank tracking is an add-on, not included by default.
セムラッシュ: The position tracking tool in Semrush tracks keyword rankings by device, location, and search engine. SERP features and competitor comparisons are built in. The Pro plan lets you track keyword rankings for up to 500 keywords with daily updates.
⚠️ 警告： Ahrefs charges extra for daily rank tracking updates. Semrush includes daily keyword tracking in all paid plans. Factor in this cost when comparing seo data plans.
6. 競合分析
Ahrefs: The Ahrefs site explorer tool gives a full domain overview for any competitor. You can see organic keywords, top ranking pages, backlinks, and how much traffic they get. Ahrefs lets you compare keyword gap data across up to 10 competitors, the widest competitive research available.
セムラッシュ: Semrush competitive research tools show traffic, backlinks, and top keywords for any domain. The Market Research Toolkit adds industry-level analysis and market trends. The keyword gap tool compares up to 4 competitors. This gives marketing teams gain valuable insights into the competition’s strategy.
7. 広告とソーシャルメディア
Ahrefs: Ahrefs is a pure SEO tool. It does not offer PPC research, advertising analysis, or social media management features. If you need these, you will need a separate marketing tool alongside Ahrefs.
セムラッシュ: Semrush includes a full Advertising Toolkit for PPC research and ad copy analysis. The social media toolkit lets you schedule posts and track performance across major platforms. This makes Semrush a stronger digital marketing tool than Ahrefs for full-funnel teams.
8. 価格設定とコスト
Let’s compare Ahrefs pricing vs Semrush pricing side by side.
| 計画レベル | アーレフス | セムラッシュ |
|---|---|---|
| エントリ | ライトプラン — 月額108ドル | プロプラン — 月額117.33ドル |
| 中級 | スタンダードプラン — 月額208ドル | グル — 月額208.33ドル |
| 高度な | 上級プラン — 月額374ドル | Business — $416.66/month |
| 無料トライアル | ❌ いいえ | ✅ 7日間無料トライアル |
| Keywords Tracked (Entry) | 750 keywords (Lite) | 500 keywords (Pro) |
Ahrefs: Ahrefs is $9 cheaper at the entry level. The Lite plan tracks 750 keywords, which is more than Semrush Pro. However, the credit-based system can limit reports for heavy users. Heavy keyword research workflows may need the $208/month Standard plan.
セムラッシュ: Semrush costs slightly more per month. But you get SEO, PPC, content marketing, and social media in one plan. When you add up what other SEO tools and marketing tools would cost separately, Semrush offers better value per dollar for full marketing teams.
さまざまなシナリオ
| 必要な場合は | 選ぶ | なぜ |
|---|---|---|
| 最適なバックリンクデータ | アーレフス | 数兆のリンクがインデックス化されています |
| All-in-one marketing tool | セムラッシュ | SEO + PPC + ソーシャルメディア + コンテンツ |
| Beginner-friendly SEO tool | アーレフス | Shallow learning curve |
| 購入前に無料トライアルをご利用いただけます | セムラッシュ | 7日間無料トライアル |
| クライアントを持つ代理店 | セムラッシュ | クライアントポータルとレポート |
| Pure technical SEO focus | アーレフス | Best site explorer tool |
💰 あなたの予算
Ahrefs starts at $108/month. Semrush starts at $117.33/month. Both are premium-priced, but Ahrefs is $9 cheaper at the entry level for SEO professionals on a tight budget.
🔌 あなたの技術スタック
If you already use other SEO tools for PPC and social media, Ahrefs fits as your dedicated SEO platform. If you want one platform to replace multiple tools, Semrush is the better fit.
📝 あなたのSEO戦略
If your focus is link building strategies and backlink data, Ahrefs is the clear winner. If you need content planning and seo friendly content scoring, Semrush has stronger keyword tools and writing assistants.
🎓 あなたの経験レベル
Ahrefs has a shallow learning curve and is easier for beginners. Semrush has a steep learning curve but rewards you with more advanced features once you master the platform.
🆓 無料トライアルとデモ
Semrush offers a 7-day free trial for Pro and limited free tools. Ahrefs offers no free trial. If you want to test before paying, Semrush is the safer choice.
🛟 サポートオプション
Both offer email and chat customer support. Semrush provides more educational resources, including free courses and the Semrush blog with seo tips. Ahrefs support gets mixed reviews from users.
切り替えガイド
Already using one of these SEO tools? Here is what to expect if you switch.
🔄 AhrefsからSemrushに切り替えますか？
✅ 得られるもの：
- Full content marketing toolkit with SEO writing assistant
- Built-in social media toolkit and PPC research tools
- Semrush CoPilot AI for automatic SEO recommendations
❌ 失うもの：
- The most trusted backlink data and ahrefs backlink profile tool
- 競合他社10社のキーワードギャップ分析（Semrushでは4社までに制限）
- Simpler interface and shallow learning curve
📋切り替え方法：
- Export your tracked target keywords and backlink reports from Ahrefs
- Sign up for the 7-day Semrush free trial to test your workflow
- Connect Google Analytics and Google Search Console, then import keywords
🔄 SemrushからAhrefsに切り替えますか？
✅ 得られるもの：
- The largest backlink database for link building opportunities
- 最大10ドメインのギャップ比較を含む、より広範な競合分析
- よりクリーンでシンプルなインターフェースで、習得も容易です。
❌ 失うもの：
- Content marketing tools and SEO writing assistant
- Social media management and paid search advertising tools
- Device-level rank tracking and Google Trends integration
📋切り替え方法：
- Semrushからキーワードリストとプロジェクトデータをエクスポートします。
- Sign up for Ahrefs Lite and set up your first project
- Import keywords and start monitoring backlinks in the Ahrefs site explorer
最終評決
| カテゴリ | 勝者 |
|---|---|
| 🔑キーワード調査 | アーレフス |
| 🔗 バックリンク分析 | アーレフス |
| 🔍サイト監査 | セムラッシュ |
| 📝 コンテンツマーケティング | セムラッシュ |
| 📊 ランキング追跡 | セムラッシュ |
| 🕵️ 競合分析 | アーレフス |
| 📱 ソーシャルメディア＆PPCツール | セムラッシュ |
| 👶 使いやすさ | アーレフス |
| 🏆総合優勝 | アーレフス |
🏆 受賞者：Ahrefs
Ahrefs wins 4 out of 8 categories — and takes the overall crown for SEO-focused users.
最適な用途: Link building experts, SEO consultants, deep keyword research, and anyone who wants the most trusted backlink data in the industry.
AhrefsとSemrushは、異なるタイプのユーザー向けに設計されています。
Ahrefs is the best SEO tool for pure search engine optimization work — backlinks, organic search traffic, and competitor research.
Semrush is the best all-in-one marketing tool for SEO, PPC, social media, and content creation in one place.
Semrush is excellent if you need a complete digital marketing platform with content marketing tools.
However, if you want the most accurate seo data and the best backlink research, Ahrefs is the smarter choice.
さあ、検索エンジンのランキングを制覇しに行こう！
Ahrefsの比較をもっと見る
Here’s how Ahrefs stacks up against other best seo tools in the market:
Ahrefs vs サーファー SEO
Ahrefsが勝利した点： Backlink analysis, keywords explorer depth
Surfer SEOが勝利した点： On-page SEO scoring, SERP-based content briefs
Ahrefs vs コンテンツラプター
Ahrefsが勝利した点： Trusted backlink data, organic keyword rankings
Content Raptorが勝利した点： AI content creation, lower price point
Ahrefs vs Moz
Ahrefsが勝利した点： バックリンクデータベースのサイズ、キーワードの難易度の精度
Mozが勝利した点： Local SEO tools, beginner community resources
Ahrefs vs SEランキング
Ahrefsが勝利した点： バックリンク調査、ドメイン評価の精度
SEランキングで勝利した項目： Budget pricing, white-label client reports
Ahrefs vs ユーバーサジェスト
Ahrefsが勝利した点： Data depth, professional-grade SEO features
Ubersuggestが勝利した点： Low pricing, simple interface for beginners
Ahrefs vs マングール
Ahrefsが勝利した点： Backlink index, deep competitive research
マングールズが勝利した理由： Affordable pricing, clean keyword tools
Ahrefs vs ランクトラッカー
Ahrefsが勝利した点： Full SEO suite, backlink analysis depth
Ranktrackerが勝利した点： Focused rank tracking, lower monthly cost
Semrushの比較をもっと見る
Here are the top Semrush alternatives and how they compare:
Semrush vs Content Raptor
Semrushが優れている点： 機能の幅広さ、確固たる評判
Content Raptorが勝利した点： AI content writing, simpler workflow
Semrush vs Surfer
Semrushが優れている点： All-in-one marketing, PPC and social tools
サーファーが勝利： Content scoring, on page seo checker depth
Semrush vs SE Ranking
Semrushが優れている点： Feature depth, content marketing toolkit
SEランキングで勝利した項目： 低価格設定、ローカルSEO機能
Semrushが優れている点： Accurate data, professional-grade tools
Ubersuggestが勝利した点： Lifetime pricing, easier learning curve
Moz Pro vs Semrush
注記： The Moz Pro Semrush comparison is one of the most searched in SEO.
Semrushが優れている点： Feature count, advertising and social media tools
Moz Pro wins on: User-friendly interface, community resources
Semrush vs Mangools
Semrushが優れている点： マーケティングスイート、ソーシャルメディアツール
マングールズが勝利した理由： Beginner-friendly design, affordable plans
Semrush vs SEO PowerSuite
Semrushが優れている点： Cloud-based access, full marketing toolkit
SEO PowerSuite wins on: One-time desktop license, no subscription
よくある質問
SemrushとAhrefs、どちらが良いですか？
Ahrefs is better for pure search engine optimization, backlink analysis, and keyword research. Semrush is better if you need an all-in-one marketing tool that covers SEO, PPC, and social media management.
Ahrefsは料金に見合う価値があるのか？
Yes. Ahrefs has trillions of backlinks indexed and accurate keyword data. For growing organic search traffic, the Ahrefs site explorer tool and keywords explorer deliver strong value to SEO professionals.
Semrushは無料で利用できますか？
Yes. Semrush offers a free plan limited to 10 requests per day. You can also start a 7-day free trial of the Pro plan to test all features before paying.
Is Ahrefs good for SEO beginners?
Yes. Ahrefs has a shallow learning curve and a clean dashboard. Tools are organized logically, making it easy for beginners to start backlink analysis and keyword research within minutes.
Semrushの弱点は何ですか？
Semrush has a steep learning curve due to its massive feature set. Plans include only one user account, with extra seats costing $45 to $100 per user per month.
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