Reshape what the algorithms believe about you.

Algorithmic self-determination is your ability to decide how algorithms see you, instead of accepting the profile they build from everything you do. It starts with privacy: MirrorMask mixes a persona's browsing into what gets collected, so your data says less about you and is worth less to advertisers. Read the full guide.

Turning off personalized ads limits how ads are targeted, but the profile behind them stays. MirrorMask mixes a persona's searches and visits into what Google and others collect, so the picture they hold of you becomes less accurate over time, for advertisers and for any AI agents that draw on it.

You can retrain it by hand: watch and search for what you want more of, and use Not interested on the rest. MirrorMask does this for you in its own browser window, watching and searching as a persona you choose, so new topics can start showing up in your home feed.

It's how platforms like Google, YouTube, and Facebook decide what content to show you based on what they think you're interested in. MirrorMask changes the signals those algorithms rely on, so you get to influence what shows up in your feeds instead of leaving it entirely up to them.

MirrorMask runs entirely on your Mac. All browsing data (your baseline profile, browsing history, and persona activity) stays on your machine. The only server communication is license key activation and anonymous usage analytics via TelemetryDeck, a privacy-first analytics tool that collects no personal data. No tracking, no advertising, no data sold.

Nobody can promise how a platform will act, but curating your own signals uses the same actions any person takes: searching, visiting pages, clicking, scrolling and watching videos. MirrorMask never posts, comments, likes or votes, and it runs at most one automatic session a day.

Ad platforms build your profile based on what you search, watch, and visit. MirrorMask does those things as someone else: a Fisherman, an Investor, a Pet Lover. Over time, the algorithms update their model of you to reflect the persona's interests.

These platforms already have years of data about you. MirrorMask adds persona activity on top, so what they've collected says less about the real you over time. The goal isn't to hide from data collection. It's to make what they've collected less useful. Think of paint mixed into water.

Ad blockers reduce future data collection. They can't undo years of behavioral history platforms already hold on you. MirrorMask mixes new interests into the existing profile, so what they've already built becomes less accurate and less useful. The two work well together.

A VPN hides your IP address. It doesn't change what Google, Facebook, or Amazon think you're interested in. They track you by your logged-in account, not your location. Your profile follows you regardless of which network you're on. MirrorMask runs entirely on your Mac. No traffic is routed through our servers.

Your Mac needs to be awake and MirrorMask open. If a day's session hasn't run yet, it runs when your Mac next wakes up.

After 7 days, the app switches to view-only mode. Upgrade to Pro for $39 (one-time, no subscription) to unlock everything permanently. 30-day money-back guarantee.

Its own, set up automatically the first time you run it. Your everyday browser is never touched.