# TrainKeeper vs ZeroFlow

The clearest difference is update cadence: ZeroFlow at every 2 days against TrainKeeper's every 3 weeks. ZeroFlow also leads on iOS requirement (17.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. TrainKeeper sells 2 in-app purchases, starting at $1.99 per month and ZeroFlow sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

TrainKeeper ships an update every 3 weeks, ZeroFlow every 2 days. The most recent releases landed on October 3, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | TrainKeeper | ZeroFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Size | 60 MB | 10 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Clemens Oberschmied](https://appshunter.io/developer/1811168085) | [Dieter Lumb](https://appshunter.io/developer/1861541330) |

## What reviewers say

### TrainKeeper

[App page](https://appshunter.io/ios/app/trainkeeper/id6753151703)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TrainKeeper Plus - Monatlich | $1.99 | per month |
| TrainKeeper Plus - Jährlich | $12.99 | per year |


### ZeroFlow

[App page](https://appshunter.io/ios/app/zeroflow/id6758552664)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium-Abonnement, monatlich | $0.99 | per month |
| Zero_Flow_premium | $8.99 | per year |


## Frequently asked questions

### Is TrainKeeper free?

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

### Is ZeroFlow free?

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

### Do TrainKeeper or ZeroFlow have ads?

Neither TrainKeeper nor ZeroFlow shows ads.

### Which is updated more often, TrainKeeper or ZeroFlow?

TrainKeeper ships an update every 3 weeks, and ZeroFlow every 2 days. Most recently, TrainKeeper was updated on October 3, 2026 and ZeroFlow on October 12, 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.*