Concentration 
Concentration is a free Chrome extension that uses keywords and language processing to block distracting website categories during study or work. Users should review browser permissions, verify blocking rules, avoid entering sensitive browsing context, configure emergency and accessibility exceptions, understand that productivity varies and retain personal control over schedules and wellbeing.
Starting price Free
Tool Information
Concentration is a free Chrome extension that uses keywords and language processing to block distracting website categories during study or work. Users should review browser permissions, verify blocking rules, avoid entering sensitive browsing context, configure emergency and accessibility exceptions, understand that productivity varies and retain personal control over schedules and wellbeing.
Use authorized, minimal inputs and grant integrations the least access required. Configure privacy, retention, sharing, quality, accessibility, disclosure, export, governance, moderation and spending controls. Test representative cases, verify generated facts, calculations, citations, customer messages, code, trades and financial details, preserve originals and version history, and retain accountable human approval before publication, outreach, deployment or operational action.
The reviewed Chrome extension is free and does not require a paid ChatGPT account. Browser permissions, keyword rules, blocked sites, data practices and future terms may change.
AI output can be inaccurate, biased, derivative, insecure, incomplete or misleading. Review consent, copyright, financial risk, training and retention terms, renewals, refunds, platform rules and applicable law. Medical, education, finance, investment, compliance, marketing, travel and customer-facing workflows require qualified human review.
F.A.Q (3)
Pros and Cons
Pros
- Blocks websites associated with user-defined distraction categories
- Accepts natural-language categories instead of requiring a domain list
- Offers a faster local NLP-based strict mode
- Provides a more accurate ChatGPT-based classification mode
- Lets users add blocking categories
- Lets users remove categories when focus needs change
- Installs from the Chrome Web Store as a browser add-on
- Has no listed installation charge
- Does not require a paid ChatGPT subscription
- Follows the Chrome Web Store's recommended practices
- Has received a Featured badge in the Chrome Web Store
- Uses a compact extension package
- Can classify pages beyond exact URL matches
- Provides a simple popup-based setup
- Lets users switch between strict and ChatGPT modes
- Can tailor blocking to a person's own description of distracting content
Cons
- The extension was last updated in September 2023
- Its listed user count is small
- The rating is based on a limited number of reviews
- Its store listing names English as the sole supported language
- The store disclosure categorizes the publisher as a non-trader
- European consumer protections may not apply to the developer relationship
- The extension handles browsing history
- The extension handles user activity
- The extension can access website content
- ChatGPT classification is slower than strict mode
- Local strict mode is described as less accurate
- Category classification can block legitimate research and work pages
- Misclassified pages can interrupt time-sensitive tasks
- Browser permissions increase extension attack surface
- Cross-browser and mobile versions are not documented
- Website blocking alone does not address applications or phone distractions
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Before you subscribe
- Check the currency, billing period, automatic renewal, usage limits and seats at checkout — prices and promotions change.
- App-store pricing can differ from website pricing by country, device and tax.
- Share only authorised data, and read the provider's encryption, retention and model-training terms first.
- AI output can be incomplete or wrong. Verify facts, citations, calculations and code before you publish or ship.
- Commercial usage rights vary by plan, provider terms and jurisdiction.
- None of these tools replaces a qualified professional for medical, legal or financial decisions.
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