# HYDRA.IO vs Piko

HYDRA.IO and Piko are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. HYDRA.IO sells 1 in-app purchase, starting at $3.99 per month and Piko sells 8 in-app purchases, starting at $7.99 per year. Whichever you choose, the download price is not the number that matters.

HYDRA.IO ships an update fortnightly, Piko every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | HYDRA.IO | Piko |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Size | 25 MB | 24 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Clement Dupre](https://appshunter.io/developer/1887211457) | [Tap & Swipe](https://appshunter.io/developer/1799447979) |

## What reviewers say

### HYDRA.IO

[App page](https://appshunter.io/ios/app/hydraio/id6790794354)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HYDRA Pro | $3.99 | per month |


### Piko

[App page](https://appshunter.io/ios/app/piko-water-tracker/id6795915109)

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Piko Pro Yearly | $7.99 | per year |
| Piko Pro Yearly | $14.99 | per year |
| Piko Pro Yearly | $19.99 | per year |
| Piko Pro Yearly | $24.99 | per year |
| Piko Pro Lifetime | $6.99 | one-time |
| Piko Pro Lifetime | $14.99 | one-time |
| Piko Pro Lifetime | $19.99 | one-time |
| Piko Pro Lifetime | $34.99 | one-time |


## Frequently asked questions

### Is HYDRA.IO free?

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

### Is Piko free?

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

### Do HYDRA.IO or Piko have ads?

Neither HYDRA.IO nor Piko shows ads.

### Which is updated more often, HYDRA.IO or Piko?

HYDRA.IO ships an update fortnightly, and Piko every 2 weeks. Most recently, HYDRA.IO was updated on October 31, 2026 and Piko on October 31, 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.*