# Gauge vs TBM Boldface

The clearest difference is in-app purchases: TBM Boldface at none against Gauge's 1. TBM Boldface also leads on update cadence (every 5 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Gauge sells 1 one-off in-app purchase. TBM Boldface asks for nothing beyond the download.

Gauge ships an update every 2 weeks, TBM Boldface every 5 days. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Gauge | TBM Boldface |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tbm-boldface/id6804532133/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 9 MB | 4 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) | [MARK WALLACE WOLFGANG](https://appshunter.io/developer/1875078935) |

## What reviewers say

### Gauge

[App page](https://appshunter.io/ios/app/gauge-water-operator-prep/id6803531173)

Prepare for wastewater operator certification exams with a focus on the math section. This app offers free calculators for essential formulas and provides step-by-step solutions to common mistakes. Practice with timed exams that mirror the actual test format and weighting.

**Highlights:** Free operator math calculators, Step-by-step worked solutions, Timed practice exams, Formula selection drills, Offline functionality, Exam blueprint adherence

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Unlock | $14.99 | one-time |


### TBM Boldface

[App page](https://appshunter.io/ios/app/tbm-boldface/id6804532133)

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

**In-app purchases:** none


## Frequently asked questions

### Is Gauge free?

Gauge is free to download, with in-app purchases available.

### Is TBM Boldface free?

TBM Boldface is free to download, with no in-app purchases.

### Do Gauge or TBM Boldface have ads?

Neither Gauge nor TBM Boldface shows ads.

### Which is updated more often, Gauge or TBM Boldface?

Gauge ships an update every 2 weeks, and TBM Boldface every 5 days. Most recently, Gauge was updated on October 19, 2026 and TBM Boldface on October 24, 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.*