SignWise vs SolvedBooks

Learn American Sign Language (ASL) by actually signing. SignWise shows you a real signer, then turns on your camera and coaches you through every sign until you get it right. A COACH THAT WATCHES YOU SIGN Sign in front of your phone and SignWise checks your handshape, palm, location and movement, then tells you the one thing to fix. Get it right and the lesson moves on by itself. No buttons, no breaking your flow. YOUR FACE IS GRAMMAR TOO In ASL, raised eyebrows, a head shake or a puffed cheek change the meaning. SignWise checks your facial expressions as well as your hands, with dedicated units on questions, negation and feelings. REAL SIGNERS, NOT DRAWINGS Every sign is a short video of a real signer. New signs play big first, then shrink into the corner while you copy them. Slow them down or mirror them any time. A PATH THAT KEEPS YOU GOING - 72 units and 408 short lessons, from Hello and fingerspelling to feelings, food, work and travel - A quick check after every lesson - Spaced review that brings each sign back right before you'd forget it - Daily goals and streaks A DICTIONARY OF 1,999 SIGNS Search any word, watch it signed, and practise it with the camera. PRIVATE BY DESIGN Your camera video is processed on your phone and never recorded or uploaded. Only your progress syncs to your account. Free. No ads. No subscriptions. Sign videos come from the WLASL dataset (Li et al., 2020).

SolvedBooks is a free study companion for university and graduate students working through classic mathematics textbooks. Every solution is written from scratch by a working mathematician — not scraped, paraphrased, or copied from any publisher's solutions manual. Each exercise gets a complete worked proof in clean LaTeX, plus a brief final-answer summary. Currently covered — 1,400+ exercises: • Serge Lang — Undergraduate Algebra, 3rd Edition • Sheldon Axler — Linear Algebra Done Right, 4th Edition • John M. Lee — Introduction to Smooth Manifolds, 2nd Edition (GTM 218) • John M. Lee — Riemannian Manifolds: An Introduction to Curvature (GTM 176) How it works Question groups (5 exercises each) are locked by default. Tap "Watch ad to unlock" once per group and the unlock is permanent on your device. There is no in-app purchase to remove ads — the ads pay to maintain the app and cover more textbooks over time. What you will not find here • The original textbook problem statements — they are intentionally not reproduced • Hints, figures, or solutions copied from any publisher's manual • Accounts or cross-device sync — v1 is local-only and works offline Pen before Peek Please attempt each exercise yourself first. Productive struggle is where the mathematics lives. SolvedBooks is for the moments where you genuinely need a worked solution to keep moving forward, not a shortcut around the thinking. About the developer Built by Chris Pun, a math graduate working in differential geometry. If you find an error in a solution, or want a particular textbook covered, please get in touch — every piece of feedback is read. Independent study aid. Not affiliated with or endorsed by Springer, Pearson, Addison-Wesley, or any other publisher. All textbook titles, author names, and chapter references are used solely for identification.