Comparison

Simple Pendulum Calculator vs UDU Beauty

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

Head to head
About

Simple Pendulum Calculator

This physics calculator quickly computes pendulum period, frequency, maximum height, energy, and speed. It supports various units, offers instant calculations with copyable results, and includes formulas for reference. Designed for privacy and efficiency, it works seamlessly on iOS devices.

Highlights
  • Instant pendulum calculations
  • Copyable results
  • Included formulas
  • Supports various units
  • High precision (16 decimal places)
  • Ad-free and private
Features
Read full description

The Simple Pendulum Calculator is a physics/math calculator designed to find the pendulum period, frequency, maximum height, energy of the system, or speed at the bottom quickly and easily. Features: - Instant calculation. - Results are copyable to other apps. - Formulas are included as reference. - Supports up to 16 decimal places. - Supports various units for each input. - Works seamlessly on both iPhone and iPad. - Lightweight, compact app optimized for everyday use. - Ad-free and built with privacy in mind. A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position. When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth. The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum and also to a slight degree on the amplitude, the width of the pendulum's swing. Simple Pendulum equation: T = 2π * √L/g Where: T : Period of the simple pendulum L : Length of the pendulum g : Acceleration due to gravity, the standard gravity of Earth is 9.80665m/s2 The velocity at the bottom of the swing is: v = √2g * L * (1-cos(a)) Where: v : The velocity at the bottom of the pendulum a : The angle from the vertical The Maximum height is: H = L - L * cos(a) The system energy is: E = m * v2 / 2 Where: E : System energy m : Mass of the object v : The velocity at the bottom of the pendulum Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.

About

UDU Beauty

This application connects to a Wi-Fi enabled cleansing instrument, displaying real-time interface effects. It supports capturing photos and videos of the usage for review.

Highlights
  • Wi-Fi wireless image transmission
  • Real-time interface effect display
  • Photo capture
  • Video recording
Features
Read full description

UDU is a cleansing instrument application, based on Wi-Fi wireless image transmission, real-time display of interface effects. Support photo, video, etc.

Screenshots

Simple Pendulum Calculator4 screens
UDU Beauty4 screens

Verdict

The call

The clearest difference is price: UDU Beauty at Free against Simple Pendulum Calculator's $2.99. UDU Beauty also leads on update cadence (every 5 weeks vs every 31 months) and ratings volume (59 vs 1). Simple Pendulum Calculator's advantage is rating (5.0 vs 1.8). 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

CostPrice · In-app purchases · Ads · Monetization

UDU Beauty is free to download; Simple Pendulum Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Simple Pendulum Calculator holds the better App Store score, 5.0 against 1.8. That said, the two scores are not equally well evidenced: UDU Beauty has 59 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Simple Pendulum Calculator ships an update every 31 months, UDU Beauty every 5 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 5 level
Simple Pendulum Calculator versus UDU Beauty: the parameters behind the verdict, then further details
ParameterSimple Pendulum CalculatorUDU Beauty
Price$2.99Free — better
Rating5.0 (1 ratings) — better1.8 (59 ratings)
Positive reviews—14.3% of reviews
Number of ratings159 — better
Update frequencyEvery 31 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS1313.0
Further details — not scored
Size1 MB30 MB
Age rating4+4+
DeveloperNitrioShenzhen Dianzhui Culture Technology Co., Ltd.

Customer experience

Simple Pendulum Calculator

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

UDU Beauty

All ratings42 ratings
Positive23.8%
Neutral4.8%
Negative71.4%
Written reviews42 reviews
Positive14.3%
Neutral0.0%
Negative85.7%

In-app purchases

None

Simple Pendulum Calculator

No in-app purchases

None

UDU Beauty

No in-app purchases

Questions

Is Simple Pendulum Calculator free?
Simple Pendulum Calculator costs $2.99, with no in-app purchases.
Is UDU Beauty free?
UDU Beauty is free to download, with no in-app purchases.
Which has better reviews, Simple Pendulum Calculator or UDU Beauty?
Simple Pendulum Calculator is rated higher. Simple Pendulum Calculator averages 5.0 out of 5 from 1 ratings, while UDU Beauty averages 1.8 from 59 ratings.
Do Simple Pendulum Calculator or UDU Beauty have ads?
Neither Simple Pendulum Calculator nor UDU Beauty shows ads.
Which is updated more often, Simple Pendulum Calculator or UDU Beauty?
Simple Pendulum Calculator ships an update every 31 months, and UDU Beauty every 5 weeks. Most recently, Simple Pendulum Calculator was updated on November 2, 2026 and UDU Beauty on November 3, 2026.

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