Chess Shield vs ZugZwang

For chess players who want to actually get better. Endless scrolling steals the hours you'd rather spend improving. Chess Shield blocks the apps that eat your chess time. Try to open one, and a puzzle takes over the screen. Solve it to get past. Every solve moves your ELO. HOW IT WORKS Pick the apps you reach for when you meant to study. Instagram, TikTok, X, whatever's eating you. When you try to open them, a puzzle takes over. Solve it to unlock the app for a few minutes. The puzzles match your level. Type your chess.com or Lichess ELO and we'll start there. Or skip the input and we'll test you with three puzzles. From then on, every puzzle is challenging enough to make you think, solvable enough that you'll get there. Insights show you which tactics keep tripping you up. Your ELO moves in real time on every solve. FREE INCLUDES – Unlimited puzzles, matched to your ELO – 6 starter tactics: Fork, Pin, Skewer, Mate-in-1, Mate-in-2, Back-rank – 1 shielded app – Full ELO tracking – Insights into what you solve and what you miss PRO UNLOCKS – All 52 advanced tactics. Mate-in-3, Discovered Attack, Zwischenzug, endgames. The full library, not just the starters. – See every blind spot. Insights unlocks every theme. Your full weakness map, no locked tiles. – Block every app you want, not just one. Plenty to start on Free. Pro is where you stop guessing what to study. 7-day free trial on the yearly plan. $4.99/month or $39.99/year. WHY IT'S DIFFERENT Most focus apps are guilt machines. Most chess apps want your scroll. Chess Shield does both jobs at once. Every minute in here is measurable progress, not just dopamine. If you've ever wished the time you waste scrolling could be real chess time, this is it. PRIVACY We don't collect anything. No accounts, no analytics, no backend. The apps you block are opaque tokens iOS hands us. We literally can't see them. Everything stays on your device. ——— Subscription details Chess Shield Pro is offered as a monthly ($4.99/month) or yearly ($39.99/year) auto-renewing subscription. The yearly plan includes a 7-day free trial for new subscribers. Payment is charged to your Apple ID at confirmation. The subscription auto-renews unless turned off at least 24 hours before the period ends. Manage or cancel anytime in iPhone Settings → Apple ID → Subscriptions. Privacy Policy: https://chessshield.com/privacy Terms of Use: https://chessshield.com/terms

Your apps stay blocked. A solved chess puzzle opens one of them for five minutes. ZugZwang turns the reflex of opening an app into a move you have to think about. Choose the apps, categories and websites that eat your day. They are blocked at once and stay blocked. When you open one, the block screen offers one way through: solve a chess puzzle. HOW IT WORKS • Pick what to block with Apple's Screen Time picker: apps, whole categories, websites. • Opening a blocked app shows the block screen. Tap "Solve chess puzzle". • Solve it and collect five minutes of that app, or of your whole list if you prefer. When the time is up, the block comes back on its own. • The first wrong move fails the puzzle. The solution then plays out on the board, and a failed puzzle never unlocks anything. A RATING THAT IS YOURS • Three puzzles during setup find your starting rating, from beginner to strong club player. • Every puzzle after that moves it, like an Elo puzzle rating. Puzzles are served around your level, so they stay hard enough to make you stop and think. • 20,000 rated puzzles: mates, tactics, endgames, promotions. • Endless puzzles on the Puzzles tab, with filters for kind and length. STRICT MODE With strict mode on, removing an app from the list or turning strict mode off needs a harder puzzle or a 24-hour wait. Adding to the list is always allowed. YOUR PHONE STAYS YOURS • You can always turn blocking off. • Your rating and progress are saved to your account (Sign in with Apple or Google), so they move with you to a new phone. • Which apps you block stays on your device. ZugZwang never learns their names. • No ads. SUBSCRIPTION ZugZwang Pro unlocks the whole app. Choose a monthly or a yearly subscription. The yearly plan starts with a 7-day free trial, and if you allow notifications you get a reminder two days before it ends. Payment is charged to your Apple Account when you confirm the purchase, or when the free trial ends. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period, and your account is charged for the renewal within the 24 hours before the period ends. You can manage or cancel it at any time in your App Store account settings. Any unused part of a free trial is forfeited when you buy a subscription. Terms of Use: https://use-less.app/zugzwang/terms Privacy Policy: https://use-less.app/zugzwang/privacy Puzzles come from the Lichess open puzzle database (CC0).