# Grammar Express vs Gauge

The clearest difference is update cadence: Gauge at every 8 days against Grammar Express's every 149 months. Grammar Express's advantage is iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Grammar Express sells 1 one-off in-app purchase and Gauge sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Grammar Express ships an update every 149 months, Gauge every 8 days. The most recent releases landed on October 11, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Grammar Express | Gauge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gauge-water-operator-prep/id6803531173/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 149 months | **Every 8 days** |
| Monetization | — | Free with in-app purchases |
| Size | 9 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Webrich Software Limited](https://appshunter.io/developer/290203591) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### Grammar Express

[App page](https://appshunter.io/ios/app/grammar-express-correct-usage/id498943652)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Question Bank | $0.99 | one-time |


### 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 |


## Frequently asked questions

### Is Grammar Express free?

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

### Is Gauge free?

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

### Do Grammar Express or Gauge have ads?

Neither Grammar Express nor Gauge shows ads.

### Which is updated more often, Grammar Express or Gauge?

Grammar Express ships an update every 149 months, and Gauge every 8 days. Most recently, Grammar Express was updated on October 11, 2026 and Gauge on October 13, 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.*