Here is a breakdown of the plans

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Plus ($99.60/year for 1 site): Includes standard reporting, media and event tracking , and EU compliance tools. Ideal for single site owners or bloggers.
Pro ($199.60/year for 5 sites): Adds form tracking, coupons, and ecommerce, plus integrations with MemberPress and WP Charitable . Perfect for online stores and membership sites, with priority support included.
Agency ($399.60/year for 25 sites): Built for agencies, it offers advanced access control, client license management, and multi-site support.
Winner – Site Kit

If you're on a budget, Site Kit comes out teacher database on top , as it's completely free and integrates seamlessly with powerful, free tools like Google Analytics and Search Console.

That said, MonsterInsights offers excellent value for its premium plans. Its additional features, like ecommerce and form tracking, are tailored for businesses and agencies looking for deeper insights and advanced integrations.

While it’s not free, the price is affordable considering the wide range of advanced tools you get.