HydroCalc Plus vs NiuMa闹钟
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydroCalc Plus
A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.
- Friction head loss calculation (Hazen-Williams)
- US and SI unit support
- Extensive pipe material library
- Fittings and valves database
- Inverse calculation mode
- Real-time results (velocity, losses)
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Professional hydraulic engineering tool for calculating pressure losses in piping systems. Essential for engineers, plumbers, and contractors designing water distribution networks. Key Features: Calculate friction head losses using industry-standard Hazen-Williams equation Support for both US (ft, gpm, psi) and SI (m, lps, bar) units Extensive pipe material library with pre-defined roughness coefficients (C-factors) Complete fittings and valves database including elbows, tees, valves, contractions, and expansions Inverse calculations to determine optimal pipe diameter, flow rate, or length for target head loss Real-time results showing velocity, friction loss, minor losses, and total system head loss What Sets Pro Apart: Unlike basic calculators, HydroCalc Pro accounts for both major losses (pipe friction) and minor losses (fittings and valves). The app includes a comprehensive database of K-factors for various components, allowing accurate total system pressure loss calculations. Perfect For: Water supply system design Irrigation network planning HVAC piping calculations Fire protection systems Industrial fluid transport Educational purposes in hydraulic engineering Technical Capabilities: The app considers all critical factors affecting pressure loss: flow velocity, pipe diameter, internal roughness, pipe length, and fitting configurations. Materials include PVC, polyethylene, steel, cast iron, concrete, and more with accurate C-factors ranging from 120-150. Inverse Calculation Mode: Unique feature allowing backward calculations - determine required pipe size for allowable head loss, maximum flow capacity, or optimal pipe length for your system constraints. Simple, intuitive interface with instant results. No internet connection required. Professional-grade calculations in your pocket. Note: Premium modules are available in English and Spanish.
NiuMa闹钟
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专为中国打工人定制,你是否经历过: - 法定节假日忘了关闹钟,清晨 7 点被吵醒的崩溃? - 调休补班日忘了开闹钟,一觉睡到 10 点错过考勤的绝望? - 传统闹钟设置太繁琐,每次长假前后都要手动开关几十个闹钟? 「牛马闹钟」专为解决中国职场“调休”痛点而生。我们内置了精准的中国法定节假日与调休安排,自动识别工作日与假期,让你的闹钟比你更懂日历。 核心功能 - 智能调休识别:内置 2024-2026 中国官方放假安排,自动识别补班日,无需手动干预。 - 节假日静音:法定假期到来,闹钟自动保持沉默,助你一觉睡到自然醒。 - 补班日准时响:周末换班也不怕,闹钟比行政提醒更靠谱,早八党必备。 - 百度风格日历:极简视图,假期、补班、农历、节气一目了然,视觉清爽无广告。 - 桌面床头钟模式:精美横屏时钟主题,多种风格随心切换,让旧 iPhone 变身精致摆件。 - 隐私与离线:数据完全本地化,不收集隐私,不依赖网络也能稳定响铃。 付费功能 - 无限闹钟数量:解锁 3 个以上的闹钟限制,满足精细化时间管理。 - 自定义休假:支持记录个人年假、婚假、私假,闹钟将智能关停。 - 良心买断制:一次付费,永久使用。我们不搞订阅制,只做良心好工具。 由打工人设计,为打工人而生。牛马闹钟,让每一次早起都从容不迫。 - 支持更换应用图标 - 支持床头翻页时钟 - 支持 iOS16 等低版本,实现通知+提醒功能
Screenshots
Verdict
The clearest difference is price: NiuMa闹钟 at Free against HydroCalc Plus's $3.99. NiuMa闹钟 also leads on update cadence (every 5 days vs every 3 weeks). On ads, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
NiuMa闹钟 is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases and NiuMa闹钟 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
HydroCalc Plus ships an update every 3 weeks, NiuMa闹钟 every 5 days. The most recent releases landed on October 4, 2026 and October 9, 2026 respectively.
| Parameter | HydroCalc Plus | NiuMa闹钟 |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 34 MB | 15 MB |
| Age rating | 4+ | 17+ |
| Developer | Transparent Blue Water LLC | 志文 李 |
In-app purchases
HydroCalc Plus
- Pump Power Calculator$1.99
- System Curve Generator$1.99
- Pipe Database$1.99
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- Industrial Fluids Pack$2.99
NiuMa闹钟
- Pro会员$2.99









