Vibra Calc vs WS Drill Bits
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.
WS Drill Bits
This application serves machinists, designers, and manufacturing personnel with essential drill bit calculations. It features a comprehensive drill size chart with decimal equivalents, a calculator for optimal speeds and feeds across various materials, and a tool for determining drill point depth based on angle.
- Drill size and decimal equivalent chart
- Fast vertical scrolling with color-coded values
- Sliding scale for quick list navigation
- Speeds and feeds calculator for various materials
- Drill point depth calculator
- Supports metric and inch measurements
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Workshop (WS) Drill Bits Is a full functioning Drill Bit Calculator simply designed for the Machinists Workshop, Designer's and Manufacturing Personel. Contains the following three functions: 1) A vertical scrolling Drill Size and Decimal Equivalent Chart. *From 0.1mm(0.00394 Inch) to 101.6mm(4.0 Inches) *Offers Fast Vertical Scrolling *Inch Fractions are highlighted in Blue *Metric Numbers are highlighted in Red *Gage/Letter Numbers are also listed *Inch Fractions values are also listed. *A sliding scale allows you to jump to any point on the list fast.(Separately for both mm and inch values) 2) Twist Drill Speeds and Feeds *Calculates recommended Drill Speeds and Feed Rates for various materials: *Option to enter in either Metric or Inch size Drills -Aluminium -Brass -Bronze -Cast Iron -Hastelloy -Inconel -Magnesium -Monel -High Nickel Steel -Free Cutting Steel -Mild Steel -Steel -Tool Steel -Forgings -Alloys -Heat Treated Steels -Stainless Steels -Titanium -Wood and Plastics 3) Drill Point Depth Calculator *Calculates the Drill Point Depth for various Drill Point Angles (60',82',90',118',120',135') *Option to enter in either Metric or Inch size Drills.
Screenshots
Verdict
The clearest difference is rating: WS Drill Bits at 5.0 against Vibra Calc's 4.0. WS Drill Bits also leads on update cadence (every 16 months vs every 39 months). On price, ratings volume, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
WS Drill Bits holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.
Vibra Calc ships an update every 39 months, WS Drill Bits every 16 months. The most recent releases landed on September 22, 2026 and June 10, 2026 respectively.
| Parameter | Vibra Calc | WS Drill Bits |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (2 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 | 2 |
| Update frequency | Every 39 months | Every 16 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 9.0 |
| Further details — not scored | ||
| Size | 22 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Motionics LLC | Rein Rapp |
Customer experience
Vibra Calc
WS Drill Bits
In-app purchases
Vibra Calc
No in-app purchases
WS Drill Bits
No in-app purchases
Questions
Is Vibra Calc free?
Is WS Drill Bits free?
Which has better reviews, Vibra Calc or WS Drill Bits?
Do Vibra Calc or WS Drill Bits have ads?
Which is updated more often, Vibra Calc or WS Drill Bits?
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