# ProofDrink vs Simby

The clearest difference is update cadence: ProofDrink at weekly against Simby's every 3 weeks. Simby's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ProofDrink sells 2 in-app purchases, starting at $4.99 per 7 days and Simby sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ProofDrink ships an update weekly, Simby every 3 weeks. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | ProofDrink | Simby |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 11 MB | 68 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Mohammed Alsaleh](https://appshunter.io/developer/1581466887) | [VESELA NIKOLAEVA MARINOVA](https://appshunter.io/developer/6786623623) |

## What reviewers say

### ProofDrink

[App page](https://appshunter.io/ios/app/proofdrink-water-reminder-log/id6753318474)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Lifetime | $29.99 | one-time |


### Simby

[App page](https://appshunter.io/ios/app/simby/id6786623621)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simby Premium Monthly | $4.99 | per month |
| Simby Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is ProofDrink free?

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

### Is Simby free?

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

### Do ProofDrink or Simby have ads?

Neither ProofDrink nor Simby shows ads.

### Which is updated more often, ProofDrink or Simby?

ProofDrink ships an update weekly, and Simby every 3 weeks. Most recently, ProofDrink was updated on November 8, 2026 and Simby on November 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.*