BIG KAISER vs The Formula Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BIG KAISER
Access essential cutting data for various applications with this tool. It provides precise information for numerous boring heads, aiding in practical applications and specific tests. Save and share your cutting data easily.
- Cutting data for boring heads
- Supports multiple languages
- Cutting data in mm and inch
- Infeed calculation with tolerances
- Save and send cutting data
- Connect with EWE tools
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The new cutting data app leads you simple and conveniently, to the cutting data you need for your application. The BIG KAISER Cutting Data’s are the result of practical experience and specific tests. For all standard applications, the new BIG KAISER app will provide you with the fitting cutting data. In total, the app contains 61 BIG KAISER boring heads, from the smallest diameter of 0.4 mm up to 620 mm. Features • App in English, German, Italian, French and Spanish available • Cutting Data for rough and fine boring tools in mm and inch • Saving and sending used cutting data • Infeed calculation of the tools with tolerances • Manuals in German, French and English • Connect App with the EWE tools
The Formula Calculator
This app serves as a comprehensive formula library and calculator, designed for tradespeople, engineers, and students. It offers over 200 formulas across various scientific disciplines, with automatic unit conversion and offline functionality.
- Extensive formula library (200+)
- Automatic unit conversion
- Offline functionality
- Searchable formulas and elements
- Light and dark mode
- Multi-language support
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Select a formula, enter the values – the app calculates the rest. Units convert automatically. Formula Calculator is a formula library and a calculator in one. Instead of looking things up in a handbook and then calculating separately, both happen in the same view. Built for the trades, master craftsman training, engineering and study. Over 200 formulas, including: Geometry and areas, volume, mechanics and strength of materials, heat, fluid mechanics and pumps, electrical engineering, acoustics, hydraulics, chemistry and physics. Use the formulas, instead of leaving everything to AI: Periodic table (use molar mass directly), density table, building materials, formula symbols as in a technical handbook, unit converter with SI prefixes. Charts such as LogPH and h-x. Search finds formulas, elements and groups – for example Ohm, area of a circle, alkali metals or the periodic table. • Fully offline • No account, no ads, no tracking • Light and dark mode • German and many other languages • Saves recent calculations Developed by a German master craftsman. Available languages: German, English, French, Spanish, Portuguese, Italian, Dutch, Polish, Czech, Slovak, Hungarian, Romanian, Croatian, Danish, Swedish, Norwegian, Finnish, Turkish, Russian, Ukrainian, Arabic, Hebrew, Hindi, Thai, Vietnamese, Indonesian, Chinese, Japanese, Korean Also on Apple Watch: a simplified version for quick lookup or calculations with units.
Screenshots
Verdict
The clearest difference is monetization model: BIG KAISER at free against The Formula Calculator's paid. BIG KAISER also leads on iOS requirement (12.0 vs 15.0). The Formula Calculator's advantage is update cadence (every 5 days vs every 2 months). On price, review sentiment, 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.
BIG KAISER ships an update every 2 months, The Formula Calculator every 5 days. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.
| Parameter | BIG KAISER | The Formula Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 82 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | BIG KAISER Praezisionswerkzeuge AG | Sidney Thom |
Customer experience
BIG KAISER
The Formula Calculator
In-app purchases
BIG KAISER
No in-app purchases
The Formula Calculator
No in-app purchases







