# Grammo vs NIHCertification

The clearest difference is ads: NIHCertification at none against Grammo's shown. NIHCertification also leads on iOS requirement (15.1 vs 18.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Grammo sells 3 in-app purchases, starting at $4.99 per 7 days and NIHCertification sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 20, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Grammo | NIHCertification |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (83 ratings)](https://appshunter.io/ios/app/grammo-learn-english-grammar/id1622192342/reviews)** | — |
| Number of ratings | **83** | — |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 76 MB | 75 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Konsonant Ensino Digital de Idiomas Ltda](https://appshunter.io/developer/546681988) | [NATIONAL INSTITUTE OF HEALTHCAREER CERTIFICATION LLC](https://appshunter.io/developer/1884704912) |

## What reviewers say

### Grammo

[App page](https://appshunter.io/ios/app/grammo-learn-english-grammar/id1622192342)

Master English grammar with clear lessons and thousands of practice exercises. Get personalized help from an AI teacher available 24/7. Suitable for all levels, from beginner to advanced.

**Highlights:** Clear grammar lessons, Thousands of practice exercises, AI personal grammar teacher, Covers all grammar topics, Suitable for all levels, User-friendly design

**Features:** Vision Pro support, SharePlay

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grammo Plus | $4.99 | per 7 days |
| Grammo Plus | $11.99 | per month |
| Grammo Plus | $59.99 | per year |


### NIHCertification

[App page](https://appshunter.io/ios/app/nihcertification/id6760490731)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PTCB Reinstate | $649.99 | one-time |


## Frequently asked questions

### Is Grammo free?

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

### Is NIHCertification free?

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

### Do Grammo or NIHCertification have ads?

Grammo shows ads; NIHCertification does not.

### Which is updated more often, Grammo or NIHCertification?

Grammo ships an update every 2 weeks, and NIHCertification every 2 weeks. Most recently, Grammo was updated on October 20, 2026 and NIHCertification on October 2, 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.*