# Comma vs Sentry

The clearest difference is ads: Sentry at none against Comma's shown. Sentry also leads on update cadence (fortnightly vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Comma sells 3 in-app purchases, starting at $4.99 per 7 days and Sentry sells 4 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Comma ships an update every 4 months, Sentry fortnightly. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Comma | Sentry |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Fortnightly** |
| Size | 61 MB | 16 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MATEUSZ JAROSŁAW WRZESZCZ](https://appshunter.io/developer/1857207465) | [MD. NASAR UDDIN REDOY](https://appshunter.io/developer/1653522796) |

## What reviewers say

### Comma

[App page](https://appshunter.io/ios/app/comma-grammar-check-corrector/id6743360918)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $4.99 | per 7 days |
| Monthly Subscription | $9.99 | per month |
| Annual Subscription | $29.99 | per year |


### Sentry

[App page](https://appshunter.io/ios/app/sentry-hidden-camera-scan/id6782903690)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sentry Pro (Weekly) | $9.99 | per 7 days |
| Sentry Pro (Yearly) | $59.99 | per year |
| Sentry Pro Lifetime | $99.99 | one-time |
| Sentry Pro Lifetime | $149.99 | one-time |


## Frequently asked questions

### Is Comma free?

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

### Is Sentry free?

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

### Do Comma or Sentry have ads?

Comma shows ads; Sentry does not.

### Which is updated more often, Comma or Sentry?

Comma ships an update every 4 months, and Sentry fortnightly. Most recently, Comma was updated on October 11, 2026 and Sentry on October 5, 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.*