Comparison

Vibra Calc vs Mechanical Formula

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

Head to head
About

Vibra Calc

This app calculates vibration frequencies for various rotating machinery components and includes an interactive vibration severity test tool. It also offers a calculator for converting vibration units and a glossary of terms.

Highlights
  • Induction motor frequency calculation
  • Detailed gear frequencies
  • Rolling element bearing frequencies
  • Pump and fan vane pass frequencies
  • Journal bearing frequencies
  • Interactive vibration severity test
  • Vibration unit conversion
Features
Read full description

Vibra Calc calculates vibration frequencies of rotating machinery components given the specifications of each component. It includes induction motors, gears, rolling element bearings, pumps, fans & blowers, journal bearings, and belts & pulleys. Also, it provides an interactive vibration severity test tool based on the ISO 10816-3 standard. Furthermore, Vibra Calc has a calculator for vibration conversions from/to displacement, velocity, and acceleration with metric and imperial units. Features: - Induction Motor Frequency Calculator - Full detailed gears frequencies (main, harmonics, sidebands) up to 4X - Rolling element frequencies (BPFI, BPFO, BSF, FTF) given the bearing dimension or the bearing model number - Pump vane pass frequencies up to 4X - Fans blade pass frequencies up to 4X - Journal bearing frequencies corresponding to wear and oil whirl phenomena presented in a table and over an interactive chart - Belt frequencies up to 4X - Interactive Vibration Severity Test Tool based on ISO 10816-3 (INPUTS: vibration velocity in mm/s or inch/s, type of support, type of machine & OUTPUTS: Machine Operation Condition) - E-mail and Save the screen option for vibration severity tool - Vibration calculator to convert displacement/velocity/accelerations to each other (Metric & Imperial) - Vibration Glossary - Metric and Imperial units provided for all input dimensions DISCLAIMER: Vibra Calc is intended for educational purposes. Although the calculations by this app were made with great care, it may contain error or inaccuracies. Using the results of the calculations is the responsibility of the user.

About

Mechanical Formula

This app provides over 200 essential mechanical engineering formulas and calculations in a user-friendly tool. It's designed to simplify complex concepts and speed up problem-solving for students, professionals, and educators.

Highlights
  • 200+ mechanical engineering formulas
  • Instant calculations
  • Intuitive interface
  • Real-world application explanations
  • Exam preparation aid
  • Lifetime Premium option
Features
Read full description

The Mechanical Engineering Formula & Calculator app brings together 200+ essential mechanical engineering formulas and calculations in one powerful and easy-to-use tool. Designed specifically for mechanical students, professionals, and educators, this app simplifies complex concepts and makes problem-solving faster and more accurate. Developed by engineers for engineers, this app covers a wide range of mechanical engineering topics, helping users understand the principles behind each formula and how they are applied in real-world scenarios. Whether you are studying, revising, or working on-site, this app serves as your reliable engineering companion. With an intuitive interface, you can easily select any calculator, enter the required values, and get instant results with clear output. No complicated steps — just accurate calculations at your fingertips. Perfect for: - Mechanical engineering students - Practicing engineers - Technical instructors - Exam preparation & quick reference Boost your productivity and master mechanical calculations with confidence. In app purchase included : Lifetime Premium Privacy policy : https://chatlyst.in/privacy.html Terms and condition : https://chatlyst.in/tcondition.html

Screenshots

Vibra Calc4 screens
Mechanical Formula4 screens

Verdict

The call

The clearest difference is review sentiment: Vibra Calc at 50% against Mechanical Formula's 0%. Vibra Calc also leads on in-app purchases (none vs 1) and iOS requirement (8.0 vs 13.0). Mechanical Formula's advantage is rating (4.7 vs 4.0) and update cadence (every 4 months vs every 39 months). On price, ads and device support 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

Both are free to download. Mechanical Formula sells 1 one-off in-app purchase. Vibra Calc asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Mechanical Formula holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Mechanical Formula has 34 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 50% of Vibra Calc's written reviews are positive against 0% of Mechanical Formula's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Vibra Calc ships an update every 39 months, Mechanical Formula every 4 months. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard7 real differences · 3 level
Vibra Calc versus Mechanical Formula: the parameters behind the verdict, then further details
ParameterVibra CalcMechanical Formula
PriceFreeFree
Rating4.0 (2 ratings)4.7 (34 ratings) — better
Positive reviews50.0% of reviews — better0.0% of reviews
Number of ratings234 — better
Update frequencyEvery 39 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better13.0
Further details — not scored
Size22 MB42 MB
Age rating+44+
DeveloperMotionics LLCKantaben Gorasiya

Customer experience

Vibra Calc

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Mechanical Formula

All ratings34 ratings
Positive91.2%
Neutral2.9%
Negative5.9%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

Vibra Calc

No in-app purchases

1 purchases

Mechanical Formula

One-time1
  • Lifetime$9.99

Questions

Is Vibra Calc free?
Vibra Calc is free to download, with no in-app purchases.
Is Mechanical Formula free?
Mechanical Formula is free to download, with in-app purchases available.
Which has better reviews, Vibra Calc or Mechanical Formula?
Mechanical Formula is rated higher. Vibra Calc averages 4.0 out of 5 from 2 ratings, while Mechanical Formula averages 4.7 from 34 ratings.
Do Vibra Calc or Mechanical Formula have ads?
Neither Vibra Calc nor Mechanical Formula shows ads.
Which is updated more often, Vibra Calc or Mechanical Formula?
Vibra Calc ships an update every 39 months, and Mechanical Formula every 4 months. Most recently, Vibra Calc was updated on October 29, 2026 and Mechanical Formula on October 30, 2026.

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