SiteBlocker vs BlockSite: Which Website Blocker Is Right for You?

TL;DR: SiteBlocker and BlockSite both help you block distracting websites, but they take very different approaches. SiteBlocker is 100% free with all features unlocked and collects zero personal data, while BlockSite limits free users to just 3 blocked sites and charges $39.99 for lifetime access. If privacy and unrestricted access matter to you, SiteBlocker is the clear winner.

Quick Comparison

Feature	SiteBlocker	BlockSite
Price	Free (all features)	Free (3 sites) / $39.99 lifetime
Blocked sites limit	Unlimited	3 on free tier
Scheduled blocking	Yes (free)	Yes (paid)
Whitelist mode	Yes (free)	Yes (paid)
Custom blocklists	Yes (free)	Yes (paid)
Cross-device sync	Yes (free)	Yes (paid)
Data collection	None	Collects user data
Browser support	Chrome, Firefox	Chrome, Safari, Edge
Mobile apps	No	Android, iOS
Chrome Web Store rating	5.0 stars	4.7 stars
Chrome users	Growing	1M+

Features

Both SiteBlocker and BlockSite cover the core functionality you would expect from a website blocker: the ability to add sites to a block list, schedule when blocking is active, and use a whitelist mode for deep focus sessions.

The key difference is access. With BlockSite, most of these features sit behind a paywall. The free tier caps you at blocking just 3 websites, which is barely enough to cover your biggest distractions. Scheduled blocking, category blocking, and other advanced features require a paid subscription.

SiteBlocker takes the opposite approach. Every feature is available to every user from day one, with no limits on the number of blocked sites. You get scheduled blocking, whitelist mode, custom blocklists, and cross-device sync without paying a cent.

BlockSite does offer one notable advantage here: app blocking on mobile devices. If you need to block apps like Instagram or TikTok on your phone, BlockSite’s Android and iOS apps can handle that. SiteBlocker currently focuses on the browser experience.

Pricing

This is where the two extensions diverge most sharply.

SiteBlocker is completely free. There are no premium tiers, no feature gates, and no upsells. Every feature is available to every user at no cost.

BlockSite uses a freemium model. The free version limits you to 3 blocked sites, which feels more like a trial than a usable product. To unlock unlimited blocking and advanced features, you will need to pay. Their lifetime plan costs $39.99, and they also offer monthly and annual subscription options.

For anyone on a budget — students, freelancers, or anyone who simply does not want to pay for a website blocker — SiteBlocker is the obvious choice.

Privacy

Privacy is an increasingly important factor when choosing browser extensions, and for good reason. Extensions have deep access to your browsing activity, so trusting the right one matters.

SiteBlocker collects zero personal data. None. The extension does not track your browsing habits, does not build a profile on you, and does not share anything with third parties. Your block lists and settings sync through your account, but your browsing data stays entirely private.

BlockSite collects user data as part of its operation. Their privacy policy outlines the types of information gathered, which may include browsing activity and usage data. For users who are privacy-conscious, this is worth considering carefully before installing.

Ease of Use

Both extensions are straightforward to set up. Install from your browser’s extension store, create an account (or sign in), and start adding sites to your block list.

SiteBlocker keeps the interface clean and minimal. You can add sites, configure schedules, and toggle whitelist mode without navigating through layers of menus. BlockSite has a more feature-rich interface that includes category-based blocking and focus mode timers, though some users find it busier than necessary.

Neither extension has a steep learning curve. You can be up and running with either one in under two minutes.

Platform Support

BlockSite has broader platform coverage. It supports Chrome, Safari, and Edge on desktop, plus native Android and iOS apps. If you need a single blocking solution that covers your phone, tablet, and computer, BlockSite offers that breadth.

SiteBlocker supports Chrome and Firefox. While the platform list is shorter, it covers the two most popular browsers and provides a consistent experience across both. If your workflow lives primarily in the browser and you use Chrome or Firefox, SiteBlocker has you covered.

How to Switch from BlockSite to SiteBlocker

If you are currently using BlockSite and want to make the switch, the process is simple:

1. Install SiteBlocker from the Chrome Web Store or Firefox Add-ons Store and create your free account.
2. Add your blocked sites. Open your BlockSite settings, note the sites you have blocked, and add them to your SiteBlocker block list. Set up any schedules or whitelist rules you were using.
3. Uninstall BlockSite. Once you have confirmed everything is working in SiteBlocker, remove the BlockSite extension from your browser. You will immediately stop sharing browsing data with their servers.

The entire process takes about five minutes, and you will not lose any blocking functionality — in fact, you will gain access to features that were previously locked behind BlockSite’s paywall.

Who Should Choose SiteBlocker?

SiteBlocker is the better fit if you want a website blocker that is completely free with no feature restrictions, if you care about privacy and do not want your browsing data collected, or if you use Chrome or Firefox and do not need mobile app blocking. It is ideal for students, remote workers, freelancers, and anyone who wants powerful blocking tools without a price tag.

Who Should Choose BlockSite?

BlockSite makes more sense if you need to block apps on Android or iOS (not just websites), if you use Safari or Edge as your primary browser, or if you prefer an extension with a larger established user base. BlockSite’s 1M+ Chrome users and 4.7-star rating speak to a solid, well-tested product — just be prepared to pay for the features that matter most.

The Bottom Line

Both SiteBlocker and BlockSite are capable website blockers that can help you stay focused and build better digital habits. The right choice comes down to what matters most to you.

If you value free access to all features and strong privacy protections, SiteBlocker is the better pick. If you need cross-platform mobile app blocking or use Safari or Edge, BlockSite may be worth the investment.

Ready to try SiteBlocker? It is free, private, and takes less than a minute to set up. Download it here and take control of your browsing today.