# Marolli Technical Dictionary vs Tolerance Helper

The clearest difference is price: Tolerance Helper at Free against Marolli Technical Dictionary's $22.99. Tolerance Helper also leads on update cadence (weekly vs every 10 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Tolerance Helper is free to download; Marolli Technical Dictionary costs $22.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Marolli Technical Dictionary ships an update every 10 months, Tolerance Helper weekly. The most recent releases landed on September 23, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Marolli Technical Dictionary | Tolerance Helper |
| --- | --- | --- |
| Price | $22.99 | **Free** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Weekly** |
| Monetization | — | Free |
| Size | 22 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Edigeo S.r.l.](https://appshunter.io/developer/437235489) | [Dmitriy Trofimov](https://appshunter.io/developer/1598378710) |

## What reviewers say

### Marolli Technical Dictionary

[App page](https://appshunter.io/ios/app/marolli-technical-dictionary/id897515462)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tolerance Helper

[App page](https://appshunter.io/ios/app/tolerance-helper/id6745212628)

This engineering reference tool simplifies calculating ISO standard tolerances for mechanical design and manufacturing. It provides instant calculations for hole and shaft dimensions, with support for multiple units and a user-friendly interface.

**Highlights:** ISO tolerance calculations for holes and shafts, Complete engineering tolerance reference table, Minimum, maximum, and average dimension calculations, Multi-unit support (mm, inches, micrometers), Powerful search and filtering of designations, User-friendly interface with color-coded indicators, Dark mode support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Marolli Technical Dictionary free?

Marolli Technical Dictionary costs $22.99, with no in-app purchases.

### Is Tolerance Helper free?

Tolerance Helper is free to download, with no in-app purchases.

### Do Marolli Technical Dictionary or Tolerance Helper have ads?

Neither Marolli Technical Dictionary nor Tolerance Helper shows ads.

### Which is updated more often, Marolli Technical Dictionary or Tolerance Helper?

Marolli Technical Dictionary ships an update every 10 months, and Tolerance Helper weekly. Most recently, Marolli Technical Dictionary was updated on September 23, 2026 and Tolerance Helper on October 12, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*