# Hyponatremia Correction Rate vs Safe Vent

The clearest difference is in-app purchases: Hyponatremia Correction Rate at none against Safe Vent's 2. Hyponatremia Correction Rate also leads on update cadence (monthly vs every 3 months). Safe Vent's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Safe Vent sells 2 in-app purchases, starting at $2.99 per month. Hyponatremia Correction Rate asks for nothing beyond the download.

Hyponatremia Correction Rate ships an update monthly, Safe Vent every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Hyponatremia Correction Rate | Safe Vent |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 3 months |
| Size | 36 MB | 58 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Putu Angga Risky Raharja](https://appshunter.io/developer/1164107753) | [SYNAPS AI SAS](https://appshunter.io/developer/1710831235) |

## What reviewers say

### Hyponatremia Correction Rate

[App page](https://appshunter.io/ios/app/hyponatremia-correction-rate/id1576278518)

**Features:** macOS Compatibility

**In-app purchases:** none


### Safe Vent

[App page](https://appshunter.io/ios/app/safe-vent/id6468893543)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Safe Vent Full Access | $2.99 | per month |
| Safe Vent Full Access | $29.99 | per year |


## Frequently asked questions

### Is Hyponatremia Correction Rate free?

Hyponatremia Correction Rate is free to download, with no in-app purchases.

### Is Safe Vent free?

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

### Do Hyponatremia Correction Rate or Safe Vent have ads?

Hyponatremia Correction Rate shows ads; Safe Vent does not.

### Which is updated more often, Hyponatremia Correction Rate or Safe Vent?

Hyponatremia Correction Rate ships an update monthly, and Safe Vent every 3 months. Most recently, Hyponatremia Correction Rate was updated on November 3, 2026 and Safe Vent on November 3, 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.*