# Periodic Timer vs Hydra Flow Daily

The clearest difference is price: Periodic Timer at Free against Hydra Flow Daily's $1.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Periodic Timer is free to download; Hydra Flow Daily costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Periodic Timer | Hydra Flow Daily |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.1 (171 ratings)](https://appshunter.io/ios/app/periodic-timer-simple-repeat/id933241656/reviews)** | — |
| Number of ratings | **171** | — |
| Positive reviews | 52.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 26 MB | 3 MB |
| Requires iOS | **18.0** | 18.6 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Vladimir Kelin](https://appshunter.io/developer/933241655) | [Mohamed Shafi](https://appshunter.io/developer/1893969246) |

## What reviewers say

### Periodic Timer

[App page](https://appshunter.io/ios/app/periodic-timer-simple-repeat/id933241656)

This app provides a simple, repeating interval timer that can run in the background without distracting you. It offers customizable alerts, quick start options, and prevents your screen from locking while active. Ideal for various activities like fitness, cooking, and learning.

**Highlights:** Repeating interval timer, Background operation, Customizable alerts (vibration/sound), Prevent lockscreen, Shake to start, Multiple timer output modes

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and intuitive interface
- ⏱️ Effective repeating/interval timer functionality
- 🎯 Does exactly what it's designed to do
- 🔇 Vibration-only option available
- 📱 Works in background with screen off

**What reviewers complain about**

- 🔊 Sound/notification issues (unreliable or missing)
- 💰 Aggressive premium upselling in free version
- 🐛 Timer cancels when phone is shaken
- 🔋 Activates heart rate sensor, drains battery
- 📵 Doesn't work reliably with screen locked

**Reported bugs**

- Sound/notifications fail to trigger despite settings enabled
- Timer cancels when phone is shaken or moved
- Vibration doesn't work when screen is locked or off
- App crashes on launch (especially after updates)
- Watch app crashes or doesn't function

**Requested features**

- Adjustable sound volume and custom alert sounds
- Customizable vibration patterns
- Settings menu for user preferences
- Ability to add notes/labels to timers
- Seconds-only timer option


### Hydra Flow Daily

[App page](https://appshunter.io/ios/app/hydra-flow-daily/id6770568625)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Periodic Timer free?

Periodic Timer is free to download, with no in-app purchases.

### Is Hydra Flow Daily free?

Hydra Flow Daily costs $1.99, with no in-app purchases.

### Do Periodic Timer or Hydra Flow Daily have ads?

Neither Periodic Timer nor Hydra Flow Daily shows ads.

### Which is updated more often, Periodic Timer or Hydra Flow Daily?

Periodic Timer ships an update every 2 months, and Hydra Flow Daily every 2 months. Most recently, Periodic Timer was updated on November 11, 2026 and Hydra Flow Daily on November 10, 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.*