Both Cleanfox and Unroll.Me, owned by NielsenIQ, primarily assist users in managing email subscriptions by blocking them, rather than actually unsubscribing. Unroll.Me targets the US market and offers an additional feature, the Daily Rollup, which consolidates subscriptions into one email. In contrast, Cleanfox operates primarily within the EU. However, as free services, they monetize by accessing user data to some extent. If privacy is a concern, it's advisable to explore other Cleanfox alternatives that don't monetize user data.