公式プランを2026年9月に確認
「無料」は、無料ダウンロード、定期的なAI枠、制限付きアシスタントのいずれかです。現在の条件を比較して選びましょう。
Three useful starting points
Tabbit BrowserThe browser is free. AI starts with a weekly Trial allowance; setting Tabbit as your default browser unlocks a free Standard allowance at 10× Trial usage.
Brave LeoFree tier is solid for basic AI chat and page summaries. Premium unlocks more models. Privacy-first approach with no data collection.
Opera AriaFree AI assistant built into Opera. Good for quick questions and content generation. Lacks deep automation or agent capabilities.
Free Tier Breakdown
These are published plan and platform facts, checked on September 7, 2026. Allowances and model availability can change, so follow the source links before choosing.
| Browser | Free Tier | Paid Tier | Agent Mode | AI Models | Platforms |
|---|---|---|---|---|---|
| Tabbit | Trial x1 weekly; Standard x10 when set as default | Pro US$30/mo internationally | Tasks on Free; everyday Agent on Standard; full capability on Pro | Multiple model families; top-tier access is Pro | macOS, Windows |
| Brave Leo | Free use; availability varies with traffic and usage | Premium raises limits and adds faster responses | Assistant can summarize, create and organize tabs | Claude, Llama and Mixtral families; exact versions vary | macOS, Windows, Linux, Android, iOS |
| Opera Aria | AI chat + generation | No paid Aria tier stated on its official feature page | Chat-style assistant; verify automation needs separately | Aria; current implementation may change | Opera desktop and mobile browsers |
Primary sources: Tabbit · Brave Leo · Opera Aria
Detailed Reviews
Tabbit BrowserFree browser with a larger Standard AI allowance
おすすめの用途: People who want multi-model chat and Agent tasks in a free daily browser and can work within a weekly allowance
Brave LeoPrivacy-first AI for the security-conscious
おすすめの用途: Privacy-focused users who want basic AI features for free
Opera AriaFree AI assistant built into a familiar browser
おすすめの用途: Casual users who want free AI chat without changing their workflow
Find Your Match
I want to automate tasks and let AI do the work
Tabbit includes web and document tasks on Free, everyday Agent use on Standard, and fuller capability on Pro.
I care most about privacy
Brave says Leo does not retain chats or use them for model training, and it supports local or remote bring-your-own models.
I want AI in a browser I already know
Both feel like traditional browsers with AI added on. Good for quick questions but lack the automation depth of AI-native browsers.
I want the most AI models for free
Tabbit lists multiple model families on Free and Standard. Exact versions and regional availability can change; top models are reserved for Pro.
I'm on a budget and need predictable free access
Start with the weekly Trial allowance, or set Tabbit as your default browser for the free Standard allowance at 10× Trial usage.
Read the terms
Published limits matter more than the download price. Check the allowance, model access and automation depth before moving your workflow.
Trial and Standard use weekly allowances. Standard is free when Tabbit is your default browser; top models and heavier Agent use sit in Pro.
Free access varies with traffic and usage. Leo Premium offers higher limits, more models and faster responses.
Opera presents Aria as a free built-in assistant. Its official page does not promise every future model, feature or regional rollout.
FAQ
毎週リセットされるTrial枠から始め、既定ブラウザに設定すると無料のStandard枠を利用できます。最新条件は公式プランで確認してください。