OneUke vs ChemBench

OneUke 是为尤克里里完全新手设计的入门 App。每天打开，只需要完成一个清楚的小目标：认识四根弦、把琴调准、跟稳四拍、按响第一个和弦，最后弹出一首熟悉的旋律。 你可以： - 跟随 7 天入门计划，从第一次拨弦开始学习 - 使用标准 G C E A 调音器，理解每根弦该调高还是调低 - 学习 C、Am、F、G7 等常用入门和弦 - 用节拍器、慢速播放和分段循环建立稳定节奏 - 练习原创旋律与公版经典旋律，并查看和弦或 TAB - 导入 ChordPro、TXT 或 PDF 曲谱，保存在自己的设备上 - 查看练习分钟、课程进度和本地成就 无需注册或登录。调音时，麦克风音频只在设备上实时分析，不会录音、保存或上传；导入的曲谱和学习进度也只保存在本机。 免费下载可完成前两天课程，体验“认识琴弦、完成调音、弹出熟悉旋律”的完整入门过程。一次性买断即可解锁后续课程、完整和弦库、全部曲目、曲谱导入和详细统计。

ChemBench turns chemistry into interactive reasoning. Adjust conditions, build structures and enter calculation evidence before checking your conclusion. Compare reagents and calculate yield; predict gas quantities and partial pressures; compose reactions and calculate signed enthalpy changes. Key readings appear after the corresponding calculations pass. EIGHT SUBJECTS, 157 LEVELS Stoichiometry, solutions and acids/bases, gases and thermochemistry, redox and electrochemistry, organic structures, equilibrium, ions and precipitation, molecules and crystals. 63 levels are free; 94 require Pro. Each subject includes Intro, Core and Brainer difficulties. PRACTICE AND EXPLORE • A free daily challenge, including rotating questions drawn from Pro levels • Courses, a review queue and subject learning records; assisted and independent solves are recorded separately • Reaction Cards explain the laws using the current problem's values • 13 quick tools, including molar mass, balancing, half-reactions, equilibrium constants, ionic coexistence and solubility curves; unlimited results and non-consumable hints • Periodic trends and comparisons, 3D crystal models, packing calculations and linked concepts • iPad split layouts and handwritten scratch work; resume unfinished problems PRO — ONE-TIME PURCHASE All 157 levels, full post-solve Reaction Card derivations, quick-tool working, configurable saved experiments, and custom problem creation with offline export. Change equations, solution conditions or gas-mixture components and check a new calculation. Pro includes every answer and all Pro features. One-time purchase. No subscription. Three sample answers per category are free to view again. Unlock Pro for all remaining answers. Existing answer-pack purchases can still be restored for their original difficulty. PRIVACY AND MODELS Problems, calculations and local records work offline. No ads or analytics SDK. Each teaching model has stated limits, such as ideal gases, concentration-based acid/base calculations at 25°C and Hess reactions with specified physical states. See the in-app model notes. This is a calculation and reasoning tool; it contains no laboratory procedures and promises no exam-score gains. Support, Privacy Policy and Terms of Use are in Settings.