# Trinki vs Flow

The clearest difference is price: Trinki at Free against Flow's $3.99. Flow's advantage is in-app purchases (none vs 4) and iOS requirement (16.2 vs 18.5). On update cadence, ads and device support there is nothing between them.

Trinki is free to download; Flow costs $3.99 up front. Trinki sells 4 one-off in-app purchases. Flow asks for nothing beyond the download.

Trinki ships an update every 4 days, Flow every 5 days. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Trinki | Flow |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 days |
| Monetization | Free with in-app purchases | — |
| Size | 10 MB | 40 MB |
| Requires iOS | 18.5 | **16.2** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Noel Weinberg](https://appshunter.io/developer/1823665034) | [LOKRIS](https://appshunter.io/developer/1399579866) |

## What reviewers say

### Trinki

[App page](https://appshunter.io/ios/app/trinki-water-reminder-tracker/id6748217192)

This app calculates your personalized daily water intake goal based on scientific guidelines and adjusts it for weather conditions. It provides smart, adaptive reminders throughout the day and offers a map of public drinking fountains.

**Highlights:** Personalized hydration goals, Weather-aware goal adjustments, Smart and adaptive reminders, Fountain map for Germany, Progress tracking, Flexible glass sizes, Quiet hours

**Features:** Family Sharing, Apple Watch app

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Espresso | $1.99 | one-time |
| Cappuccino | $3.99 | one-time |
| Trinki Pro | $3.99 | one-time |
| Coffee & Cake | $5.99 | one-time |


### Flow

[App page](https://appshunter.io/ios/app/flow-hydration-tracker/id6758463516)

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

**In-app purchases:** none


## Frequently asked questions

### Is Trinki free?

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

### Is Flow free?

Flow costs $3.99, with no in-app purchases.

### Do Trinki or Flow have ads?

Neither Trinki nor Flow shows ads.

### Which is updated more often, Trinki or Flow?

Trinki ships an update every 4 days, and Flow every 5 days. Most recently, Trinki was updated on October 5, 2026 and Flow on October 1, 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.*