Comparison

HydroCalc Plus vs HelloTimer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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)
Features
Read full description

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.

About

HelloTimer

This app helps you build focus and rhythm with versatile timer functions. It supports multiple timers, background running, and real-time progress display on your lock screen or in a floating window. Track your time investment with detailed statistics for improved productivity.

Highlights
  • Multiple countdown and count-up timers
  • Dynamic Island and Lock Screen integration
  • Floating window mode (Picture-in-Picture)
  • Background timer operation
  • Save and track timer sessions
  • Chart-based time statistics
Features
Read full description

TimerPlus is more than a timer — it helps you build rhythm, stay focused, and move through your tasks with clarity. Count up, count down, or run multiple timers at once for study, workouts, cooking, deep work, and daily routines. 【Focus on Your Task】 • Dynamic Island & Lock Screen — See your timer in real time without unlocking your phone • Floating Window Mode — Picture-in-Picture lets you keep timing while handling other tasks • Background Running — Switch apps freely; your timers won’t stop 【Record & Understand Your Time】 Both count-up and countdown sessions can be saved. With chart-based statistics, you can clearly see how much time you invest in each task—making time management more rewarding. 【A Pure, Minimal Experience】 A clean and restrained interface with no unnecessary steps or distractions. Thanks for downloading! (#^.^#)

Screenshots

HydroCalc Plus4 screens
HelloTimer4 screens

Verdict

The call

The clearest difference is price: HelloTimer at Free against HydroCalc Plus's $3.99. HelloTimer also leads on update cadence (daily vs every 3 weeks). HydroCalc Plus's advantage is device support (3 vs 1). On rating, review sentiment, ratings volume and ads 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

CostPrice · In-app purchases · Ads · Monetization

HelloTimer is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases and HelloTimer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for HydroCalc Plus against 5.0 for HelloTimer. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

HydroCalc Plus ships an update every 3 weeks, HelloTimer daily. The most recent releases landed on October 4, 2026 and October 3, 2026 respectively.

Scorecard4 real differences · 6 level
HydroCalc Plus versus HelloTimer: the parameters behind the verdict, then further details
ParameterHydroCalc PlusHelloTimer
Price$3.99Free — better
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings12 — better
Update frequencyEvery 3 weeksDaily — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better16.1
Further details — not scored
Size34 MB28 MB
Age rating4+4+
DeveloperTransparent Blue Water LLC海峰 陈

Customer experience

HydroCalc Plus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

HelloTimer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

HydroCalc Plus

One-time4
  • Pump Power Calculator$1.99
  • System Curve Generator$1.99
  • Pipe Database$1.99
Show 1 more
  • Industrial Fluids Pack$2.99
1 purchases

HelloTimer

One-time1
  • TimerPlus Lifetime Unlock$2.99

Questions

Is HydroCalc Plus free?
HydroCalc Plus costs $3.99, and also offers in-app purchases.
Is HelloTimer free?
HelloTimer is free to download, with in-app purchases available.
Which has better reviews, HydroCalc Plus or HelloTimer?
HydroCalc Plus and HelloTimer are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do HydroCalc Plus or HelloTimer have ads?
Neither HydroCalc Plus nor HelloTimer shows ads.
Which is updated more often, HydroCalc Plus or HelloTimer?
HydroCalc Plus ships an update every 3 weeks, and HelloTimer daily. Most recently, HydroCalc Plus was updated on October 4, 2026 and HelloTimer on October 3, 2026.

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