认识字母 vs MathBoard

认识字母是一款专为2-6岁儿童设计的英语字母认知启蒙App，通过7个精心设计的互动关卡，帮助孩子循序渐进地认识26个英文字母。 【7大互动关卡】 第1关 认一认：看图听音，四选一认识基础字母 第2关 听一听：听清名字，选出对应字母卡片 第3关 配一配：拖拽字母，匹配正确影子 第4关 连续闯关：10题混合挑战，3条命闯关模式 第5关 拼一拼：字母碎片拼图，拼出完整图案 第6关 找字母：在趣味场景中找出隐藏字母 第7关 玩字母：字母序列思维，猜猜下一个字母 【产品特色】 - 循序渐进：从认读到思维，难度逐步提升 - 多感官学习：视觉识别 + 听觉辨音 + 动手操作 - 可爱伙伴：Letterie 全程陪伴，即时鼓励反馈 - 家长控制：每日时长锁，科学管理使用时间 - 纯净环境：无广告、无第三方SDK、无数据收集 【免费体验】 第1关完全免费，满意后再解锁全部7关。 【订阅说明】 - 终身解锁：一次买断，永久享有全部关卡 - 月订阅：每月自动续费，含3天免费试用 - 年订阅：按年自动续费，含3天免费试用 - 订阅可随时在iOS设置中取消 Copyright © 2026 wangzz 隐私政策：https://github.com/wangzz/md-doc/blob/main/KnowLetter/PRIVACY_POLICY.md 使用条款（EULA）：https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

MathBoard is a handwriting-first mental-math practice app. Generate arithmetic worksheets, solve each problem by hand on an iPad whiteboard, and get instant auto-grading, wrong-answer explanations, and printable PDFs. Pick a ready-made set or build your own: ① Within-10 / within-20 / within-50 / within-100 addition and subtraction ② Two-digit addition and subtraction ③ Multiplication tables, division tables, and mixed × ÷ ④ Compare numbers (greater than, less than, equal to) ⑤ Four operations mixed Work each problem with Apple Pencil or a finger on a per-question whiteboard — line up column working, carry and borrow, draw it out. MathBoard grades instantly, tracks accuracy and time, and saves every wrong answer with the correct solution, your draft, and a step-by-step explanation. A built-in process calculator lets you enter a two-digit addition or subtraction and see the answer with vertical working and stick-counting visuals — the same show-your-work approach, on demand. Designed for families: ① Apple Pencil and finger handwriting on every problem ② Auto-grading with accuracy and timing stats ③ Wrong-answer book with explanation and your draft ④ One tap generates a similar set to practice weak spots ⑤ Printable PDF worksheets — student, answer-key, and explanation versions ⑥ Bilingual: English and 简体中文, switchable at runtime ⑦ Fully offline, no ads, no accounts MathBoard is local-first: worksheets, attempts, wrong answers, and PencilKit drafts stay on the device. Nothing is uploaded. Core practice is entirely free: all problem types, number ranges, and set sizes (including comparison and two-digit) are available without paying. MathBoard Pro unlocks PDF export, full step-by-step explanations with vertical and visual models, wrong-question drills, learning reports, and batch generation — choose a Monthly or Yearly subscription, or a one-time Lifetime purchase. Contact: sectojoy@gmail.com Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://zelonai.com/app/mathboard/privacy-policy