# TrailWatch Event vs Sipflow

The clearest difference is price: TrailWatch Event at Free against Sipflow's $0.99. TrailWatch Event also leads on iOS requirement (15.1 vs 18.6). Sipflow's advantage is update cadence (every 4 weeks vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

TrailWatch Event is free to download; Sipflow costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TrailWatch Event ships an update every 2 months, Sipflow every 4 weeks. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | TrailWatch Event | Sipflow |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Size | 54 MB | 86 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Parks and Trails Limited](https://appshunter.io/developer/1747467875) | [Proper Works Limited](https://appshunter.io/developer/1860244641) |

## What reviewers say

### TrailWatch Event

[App page](https://appshunter.io/ios/app/trailwatch-event/id6448609887)

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

**In-app purchases:** none


### Sipflow

[App page](https://appshunter.io/ios/app/sipflow-water-tracker/id6758904046)

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

**In-app purchases:** none


## Frequently asked questions

### Is TrailWatch Event free?

TrailWatch Event is free to download, with no in-app purchases.

### Is Sipflow free?

Sipflow costs $0.99, with no in-app purchases.

### Do TrailWatch Event or Sipflow have ads?

Neither TrailWatch Event nor Sipflow shows ads.

### Which is updated more often, TrailWatch Event or Sipflow?

TrailWatch Event ships an update every 2 months, and Sipflow every 4 weeks. Most recently, TrailWatch Event was updated on October 30, 2026 and Sipflow on October 25, 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.*