数字筛选助手 vs FormulaPad

专业的三位数（000-999）数字过滤工具，30种过滤维度自由组合，帮你从 1000 个号码中精准筛出符合条件的子集。 【为什么选数字筛选助手】 • 31种专业过滤维度，远超同类工具 • 每个过滤器都有内置使用说明，新手 30 秒上手 • 实时显示每个条件筛除了多少号码（顺序法 / 留一法可选） • 支持「保留」与「排除」两种模式，正反向筛选都可 • 多组条件支持容错范围（允许 N 组不满足） 【27 种过滤维度】 数字类：外部号码、必有号码、胆码组、定位 形态类：形态、凹凸、大小、奇偶、质合、012 路 计算类：和值、和尾、跨度 、最大数、最小数、中间数 、合跨合、合跨差 关系类：两码合、两码差、进位两码差、两码合差、进位两码合差、断组、分解、组合、两码合/差/积定位 【内置工具】 • 多集合交集 / 并集运算 • 号码随机生成 • 三位数所有排列展开 • 倍投计算器 • 工具结果可一键导入过滤器使用

FormulaPad is a local-first math notebook calculator for iPhone. Type natural formulas, reuse variables, keep calculation history, save useful results as notes, and use practical templates for everyday math. FormulaPad is built for students, teachers, engineers, and anyone who wants calculations to stay organized after the answer appears. Key features: - Natural formula input and scientific functions - Variables such as price = 299 and count = 12 - Calculation history with reuse and favorites - Math notes with title, category, remarks, and result - Templates for percentage, discount, compound interest, BMI, loan payment, average, triangle area, and speed - Unit conversion for length, weight, area, volume, temperature, time, and speed - Simple function plotting for expressions such as x^2 and sin(x) - Local data storage, no account required - FormulaPad Pro is a one-time unlock, not a subscription FormulaPad does not include ads, third-party analytics, tracking, or a custom account system.