青于蓝 vs Rensa Lab

青于蓝APP立足于打破传统家校沟通、校园媒体传播，打造高效率的家校沟通、教育资讯，APP集班级通知、课程表、成绩下发、班级文件存储、个人成长相册、班级刊物（即《云板报》）、校级刊物（即《云校刊》）等功能为一体，为学校、老师、家长和孩子提供一个更便捷、更畅达的信息沟通、资讯分享和校园支付平台。

Rensa Lab teaches chain puzzles — the kind where falling blocks clear in groups of four and set off chains — through a problem book. Place your pieces and see right away how many chains you made. ■ Explanations that tell you why When you miss, we show what actually happened on the board: which group you cleared too early, where the falling blocks joined only a few and stopped, and where the trigger was. Replay the answer chain one step at a time. ■ 7 units, 210 problems Basics → Find the trigger → Stair links → Sandwich links → Building 101 → Long chains → Advanced building. Start easy and work your way up. ■ Today's Problem A new problem every day at midnight — easiest on Monday, hardest on Sunday. Home Screen and Lock Screen widgets show today's problem and open it in one tap. ■ Easy on the eyes A paper-toned background, soft text color and large type. Every color has its own shape (triangle, diamond, square, hexagon), so you can read the board even if colors are hard to tell apart. Dark appearance is available in Settings. ■ Reminders only if you want them We offer a reminder only after you solve your first problem. Turn it on and you get one reminder a day, at the time you choose. ■ No account, no ads, no server Start right away without signing up. Your progress stays on this device, and explanations are made on your device without the internet. ■ How it works Unit 1 (30 problems) and Today's Problem are included with no purchase. Units 2–7 (180 problems) unlock with a one-time purchase — not a subscription — which also includes every problem added later. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://inphilchoi.github.io/chainlab-privacy/