# Gesello – Metalwork Handbook — Fits, threads, CNC & more

> Technical calculations with sketches and formulas for metalworking and engineering trades. (iPhone/iPad app by Clemens Riemer.)

- Source: https://appshunter.io/ios/app/gesello-metalwork-handbook/id6819060779 (this page in markdown: same URL + `.md`)
- Developer: [Clemens Riemer](https://appshunter.io/developer/6819060781)
- Category: Reference, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 65 MB
- Languages: American English, Croatian, Czech, Danish, Dutch, French (France), German (Germany), Hungarian, Italian, Japanese and 8 more
- Released: 2026-10-10
- Data updated: 2026-10-26
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/gesello-metalwork-handbook/id6819060779/reviews.md

## What is Gesello?

The technical handbook that does the maths. Fit, thread, spindle speed or hardening temperature: enter a value – Gesello calculates your case with a sketch to scale and the calculation steps. Offline, no account, no ads. Metric, based on ISO.

WHY GESELLO?
• Calculated, not just looked up: ISO fits and threads come from formulas, not tables – for every nominal size and every pitch.
• Every result with sketch, formula and calculation steps – ideal for learning and for checking.
• Share with one tap: a clear text with a link that opens Gesello exactly where you were.
• Made for machinists, toolmakers, fitters, metalworkers, mechatronics technicians and all technical trades – in training, at technical college and in the workshop.

INCLUDED FOR FREE
• ISO tolerances and fits: limits of size, clearance, interference, transition fits, hole-basis and shaft-basis systems
• General tolerances for linear sizes, angles, radii and chamfers
• Geometrical tolerances with explanation and inspection guide
• Threads: coarse, fine, inch and special threads, tap drill, blind hole depth, thread turning with infeed per pass, thread milling
• Screws: tightening torque and preload by property class (8.8, 10.9, 12.9), engagement length, strap clamps
• Cutting data for drilling, reaming, turning, milling and grinding: spindle speed, feed, cutting speed, machining time, milling path, cutting force and power – with the speed steps of your own machine
• Surfaces: convert Rz to Ra, theoretical roughness for turning and milling
• Weight calculator for round, square, hexagon, tube, flat and sections – also straight from the stock designation
• Widths across flats, technical mathematics, triangles, unit conversion
• CNC (DIN/PAL): all G and M codes for turning and milling with sketches, face milling helper with a ready NC program
• Drawing symbols, workpiece edges and threads in technical drawings, with typical mistakes
• Standard parts: parallel keys, retaining rings and O-rings with groove dimensions
• Taper turning: compound slide angle, Morse and steep tapers, tailstock offset
• Practice: exercises with worked solutions, from the vernier caliper to fits

GESELLO PRO – BUY ONCE, NO SUBSCRIPTION
• Measuring & inspection: read calipers and micrometers, choose gauges, inspection plan, statistics, gauge block combinations
• Materials: decode steel names and material numbers, cast iron, aluminium, copper, plastics, properties
• Heat treatment: hardening temperature from the steel name, iron-carbon diagram, annealing, hardening, quenching and tempering, case hardening, nitriding, temper colours
• Convert hardness: HRC, HV, HB and tensile strength
• Grinding wheels: read the designation, maximum speed, check flanges, mount safely
• Control engineering: pneumatic and hydraulic symbols, directional valve builder, logic with truth table, displacement-step diagram, GRAFCET, electropneumatics, timers
• Hydraulics and pneumatics: piston force, air consumption, press, lines
• Production planning: process plans for turned parts, milled parts, hole patterns and assembly with cutting data and times, reorder steps by dragging, share as PDF; manufacturing cost per part and batch
• Indexable inserts: decode designations, recognise wear, troubleshooting for chatter or rough surfaces
• Bolt circles, hole rows and dividing head, counterbores and centre holes
• Bending: blank length, bend deduction, minimum bend radius, tubes, sections, rolling, flat patterns, shearing, press brake
• Tolerance stacks, welding, drives, coolant
• CNC cycles with input mask and a ready NC block
• Scientific calculator on every page, with real fractions

YOUR DATA STAYS WITH YOU
No account, no ads, no tracking. Gesello calculates directly on the device and works without internet – on the shop floor just as well as in the basement of the training centre.

Questions or ideas? Write to dev@gesello.app – Gesello is constantly being extended.

## Key features

- Calculated ISO fits and threads from formulas
- Results with sketches, formulas, and calculation steps
- Offline functionality
- Ad-free experience
- Share calculations with a link
- Includes CNC codes and drawing symbols

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Gesello Pro | $8.99 | one-time |


## Is Gesello safe?

Not enough ratings yet to assess Gesello.

## Is Gesello legit?

Gesello – Metalwork Handbook has limited verification signals. The AppsHunter Legitimacy Score for Gesello is 58 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/gesello-metalwork-handbook/id6819060779/reviews.md

### 5/5 — Mega App

*2026-10-18*

Sehr gute App. Es ist einfach zu nutzen und sieht nicht schlecht aus.

### 5/5 — Noten retter

*2026-10-18*

⭐⭐⭐⭐⭐

is echt gut die app. muss nich immer im buch alles suchen geht viel schneller und hilft in der schule

### 5/5 — Must-have für Werkstatt, Ausbildung & Prüfung!

*2026-10-15*

Endlich eine Werkstatt-App, die von Praktikern durchdacht wurde! Egal ob man schnell an der Maschine Schnittdaten, Gewinde und Passungen nachschlägt oder sich in der Ausbildung auf die Prüfung vorbereitet – Gesello liefert die exakten Werte ohne langes Suchen. 

Besonders stark: Statt bloßer Zahlen gibt es schrittweise Rechenwege, anschauliche Skizzen und super Übungsmodi, die das Verständnis echt erleichtern. Alles funktioniert blitzschnell, offline und ohne Werbung. Die integrierten Tools in der Pro-Version sind jeden Cent wert. Absolute Empfehlung für Azubis, Facharbeiter und Meister!

## Frequently asked questions about Gesello

### What is Gesello?

Gesello is a technical handbook app that performs complex calculations for various engineering and metalworking trades. It provides detailed results with sketches, formulas, and calculation steps, making it useful for learning and verification.

### Does Gesello work offline?

Yes, Gesello is designed to work offline, meaning you do not need an internet connection to access its features and perform calculations.

### What kind of calculations does Gesello offer?

Gesello offers a wide range of calculations including ISO fits and threads, general tolerances, geometrical tolerances, screw tightening torques, cutting data for various machining processes, weight calculations for different shapes, and CNC codes.

### Is Gesello free to use?

The core features of Gesello are available for free. There is a 'Gesello Pro' version available as a one-time purchase, offering additional features like measuring and inspection tools, material decoding, and control engineering modules.

### Does Gesello have ads?

No, Gesello is ad-free, providing an uninterrupted user experience for all its calculations and features.

### Can I share my calculations from Gesello?

Yes, you can share your calculations with a single tap. Gesello generates a clear text with a link that opens the exact calculation within the app for others.

### What devices is Gesello available on?

Gesello is available on iPhone, iPad, and iPod devices, running on iOS.

### How often is Gesello updated?

The latest version of Gesello is 1.0.6, which was last updated on October 17, 2026. Updates typically bring new features, bug fixes, and performance improvements.

## Version history (last 5 releases)

### 1.0.9 — 2026-10-25

New: exam trainer “Fit for the exam” with exam-style questions, worked solutions and standard-compliant sketches – question of the day, quick quiz per topic, flashcards and error reporting. Theory right in the module: threads, fits, cutting data, materials and hardness explain their values and have their own knowledge pages. New practice topics with exam tasks. Also: first and third angle projection, protection classes, rivet length.

### 1.0.8 — 2026-10-20

Gesello now also speaks Romanian, Swedish, Czech, Danish and Hungarian – 18 languages in total. Maths: in the circular arc sketch the labels no longer cover the arc or the angle. CNC basics as an interactive learning path: tappable sketches, exercises and quiz questions. Many modules redesigned for clarity: cleaner sketches, formulas with a legend, fold-out calculation steps.

### 1.0.7 — 2026-10-19

Pro: redeemed offer codes and earlier purchases are now reliably recognised, and “Restore purchases” checks directly with the App Store. The app also starts more reliably.

### 1.0.6 — 2026-10-17

The calculator now works like a modern school calculator: square root, power, n-th root and absolute value as boxes – your input stays inside until you leave with ▶. Brackets grow with fractions, exponents sit at the top of the bracket. Gesello now speaks 13 languages, newly French, Italian, Russian, Japanese, Chinese, Croatian and Dutch. Devices set to Bosnian, Serbian or Montenegrin show Gesello in Croatian. Set inserts and toolholders position by position on wheels, with an explanation for each position. CNC basics with new practice cards for turning and milling. New sketch of the infeed modes for thread turning. On PC and tablet, the bar with Home, Favourites, Settings and Calculator is now there too. Technical mathematics greatly extended: 44 new calculations from maths, physics and chemistry, e.g. strength, pressure and gases, energy, mixing cross and electroplating – with sketch and calculation steps. Every basic formula can now be rearranged for any quantity, step by step. Practice: calculation exercises laid out clearly as “Given” and “To find”, plus a magnifier for the caliper vernier.

### 1.0.2 — 2026-10-15

Neuerungen 1.0.2
es: „Gesello ahora habla español, portugués, polaco y turco. Selección de idioma con banderas en Ajustes.“
pt: „O Gesello agora fala português, espanhol, polonês e turco. Escolha do idioma com bandeiras nas Configurações.“
de: „Gesello gibt es jetzt auch auf Spanisch, Portugiesisch, Polnisch und Türkisch. Sprachwahl mit Flaggen in den Einstellungen.“
en: „Gesello now also speaks Spanish, Portuguese, Polish and Turkish. Language choice with flags in Settings.“

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-26.*