WS Drill Bits vs Circle & Sphere
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Circle & Sphere
Instantly solve geometry problems for homework and exams. Calculate circle and sphere properties with step-by-step solutions. Access learning videos and manage your calculations.
- Circle calculations (radius, diameter, circumference, area)
- Sphere calculations (surface area, volume)
- Circular sector calculations
- Step-by-step solutions
- Learning videos
- Solution management
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Do your homework instantly. Prepare for exams without stress. Free, complete step-by-step solutions. Enter your values and calculate: - Circle: radius, diameter, circumference and area - Sphere: surface area and volume - Circular sector: arc length and central angle HOW IT WORKS Enter your values in the correct fields and get started. You receive the solution instantly and can share it with friends or classmates. YOUR PERSONAL DATA We don’t need it. Only anonymized data is collected, for example: - which features are used - how many solutions are generated This helps us improve. We cannot identify you. COSTS Everything is free to use. 24/7 access to your solutions. All solution steps always remain complete. If you need many solutions in a short time, various purchase options are available. EXTRAS - Overview of all measures - all length units - curated learning videos - feedback for incorrect inputs - manage your own solutions - app introduction CONTACT Questions and feedback via Discord or directly in the app review.
Screenshots
Verdict
The clearest difference is rating: WS Drill Bits at 5.0 against Circle & Sphere's 4.0. WS Drill Bits also leads on in-app purchases (none vs 8) and iOS requirement (9.0 vs 15.0). Circle & Sphere's advantage is update cadence (every 3 weeks vs every 16 months). On price, ratings volume, 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
Both are free to download. Circle & Sphere sells 8 one-off in-app purchases. WS Drill Bits asks for nothing beyond the download.
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 4 respectively.
WS Drill Bits ships an update every 16 months, Circle & Sphere every 3 weeks. The most recent releases landed on June 10, 2026 and September 19, 2026 respectively.
| Parameter | WS Drill Bits | Circle & Sphere |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.0 (4 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 16 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 57 MB | 180 MB |
| Age rating | 4+ | 4+ |
| Developer | Rein Rapp | Glindemann, Sennoun, Langer GbR |
Customer experience
WS Drill Bits
Circle & Sphere
In-app purchases
WS Drill Bits
No in-app purchases
Circle & Sphere
- +30 User Tokens$0.29
- +1 Convenience Token / 6h, max. +2$0.59
- +2 Convenience Tokens / 6h, max. +4$0.99
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- +150 User Tokens$0.99
- +300 User Tokens$1.49
- +4 Convenience Tokens / 6h, max. +8$1.59
- Remove Ads$2.99
- Lifetime Access$2.99
Questions
Is WS Drill Bits free?
Is Circle & Sphere free?
Which has better reviews, WS Drill Bits or Circle & Sphere?
Do WS Drill Bits or Circle & Sphere have ads?
Which is updated more often, WS Drill Bits or Circle & Sphere?
Other comparisons
