Vibra Calc vs Electrical Engineering Pack
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
Electrical Engineering Pack
This app provides a comprehensive suite of electrical calculators and converters for engineers, electricians, and students. It features over 60 calculators for various electrical parameters and 16 converter categories with extensive unit support. Calculations update automatically as input values or units are changed.
- 60+ Electrical Calculators
- 16 Electrical Converter Categories
- Automatic Calculation Updates
- Resistor Color Code Calculator
- Upgraded Voltage Drop Calculator
- NEC/IEEE Standards Compliant
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A complete pack of 60 Electrical Calculators and 16 Electrical Converters — designed for electrical engineers, electricians, and students. Now includes a Resistor Color Code Calculator and an upgraded Voltage Drop Calculator compliant with NEC/IEEE standards. Electrical Calculator List (60) 1. Resistor Color Code Calculator (New) 2. Transformer Calculator (Step-Up and Step-Down Voltage & Current Calculations) 3. Voltage Calculator 4. Current Calculator 5. Resistance Calculator 6. Power Calculator 7. Voltage Drop Calculator (Updated for NEC/IEEE Standards) 8. kVA to Amps (Single Phase) 9. kVA to Amps (Three Phase) 10. Amps to kVA (Single Phase) 11. Amps to kVA (Three Phase) 12. Single Phase Power Calculator 13. Three Phase Power Calculator 14. Single Phase Current Calculator 15. Three Phase Current Calculator 16. DC Horsepower 17. Single Phase Horsepower 18. Three Phase Horsepower 19. DC Current (HP) Calculator 20. Single Phase Current (HP) Calculator 21. Three Phase Current (HP) Calculator 22. Efficiency (DC) Calculator 23. Efficiency (Single Phase) Calculator 24. Efficiency (Three Phase) Calculator 25. Power Factor (Single Phase) Calculator 26. Power Factor (Three Phase) Calculator 27. Luminous Intensity Calculator 28. Luminous Flux Calculator 29. Solid Angle Calculator 30. Energy Cost Calculator 31. Energy Stored (Resistance) Calculator 32. Energy Stored (Inductance) Calculator 33. Energy Stored (Capacitance) Calculator 34. Star to Delta Conversion 35. Delta to Star Conversion 36. Inductive Reactance Calculator 37. Capacitive Reactance Calculator 38. Resonant Frequency Calculator 39. Inductor Sizing Formula 40. Capacitor Sizing Formula 41. Resistance (Series) Calculator 42. Resistance (Parallel) Calculator 43. Inductance (Series) Calculator 44. Inductance (Parallel) Calculator 45. Capacitance (Series) Calculator 46. Capacitance (Parallel) Calculator 47. Unknown Resistance (Series) Calculator 48. Unknown Resistance (Parallel) Calculator 49. Unknown Capacitance (Series) Calculator 50. Unknown Capacitance (Parallel) Calculator 51. Neutral Current (3-Phase Unbalanced Loads) 52. Characteristic Impedance (Parallel) 53. Characteristic Impedance (Coaxial) Electrical Converter Overview The Electrical Converter translates between multiple electrical units and supports both SI and USCS systems. Includes 16 Categories, 173 Units, and over 2,100 conversions. Converter Categories (16): 1. Field Strength 2. Electric Potential 3. Resistance 4. Resistivity 5. Conductance 6. Conductivity 7. Capacitance 8. Inductance 9. Charge 10. Linear Charge Density 11. Surface Charge Density 12. Volume Charge Density 13. Current 14. Linear Current Density 15. Surface Current Density 16. Power Smart Calculation Behavior Calculations update automatically when users change: • Input values • Input units • Output units
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Verdict
The clearest difference is price: Vibra Calc at Free against Electrical Engineering Pack's $4.99. Vibra Calc also leads on iOS requirement (8.0 vs 17.6). Electrical Engineering Pack's advantage is rating (4.7 vs 4.0) and update cadence (every 4 months vs every 39 months). On ads, in-app purchases 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
Vibra Calc is free to download; Electrical Engineering Pack costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Electrical Engineering Pack holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Electrical Engineering Pack has 76 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of Vibra Calc's written reviews are positive against 75% of Electrical Engineering Pack's.
Vibra Calc ships an update every 39 months, Electrical Engineering Pack every 4 months. The most recent releases landed on September 22, 2026 and September 18, 2026 respectively.
| Parameter | Vibra Calc | Electrical Engineering Pack |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.0 (2 ratings) | 4.7 (76 ratings) — better |
| Positive reviews | 50.0% of reviews | 75.0% of reviews — better |
| Number of ratings | 2 | 76 — better |
| Update frequency | Every 39 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 22 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Motionics LLC | V PUGAZHENTHI |
Customer experience
Vibra Calc
Electrical Engineering Pack
In-app purchases
Vibra Calc
No in-app purchases
Electrical Engineering Pack
No in-app purchases
Questions
Is Vibra Calc free?
Is Electrical Engineering Pack free?
Which has better reviews, Vibra Calc or Electrical Engineering Pack?
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Which is updated more often, Vibra Calc or Electrical Engineering Pack?
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