# NEXT DOOR TRAIN vs HL7 CRAYFISH

The clearest difference is iOS requirement: NEXT DOOR TRAIN at 15.0 against HL7 CRAYFISH's 17.2. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NEXT DOOR TRAIN ships an update every 4 months, HL7 CRAYFISH every 2 months. The most recent releases landed on October 5, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | NEXT DOOR TRAIN | HL7 CRAYFISH |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 180 MB | 4 MB |
| Requires iOS | **15.0** | 17.2 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [NEXT DOOR HV GmbH & Co. KG](https://appshunter.io/developer/6805401220) | [NOBORU HORIKOSHI](https://appshunter.io/developer/1797085962) |

## What reviewers say

### NEXT DOOR TRAIN

[App page](https://appshunter.io/ios/app/next-door-train/id6443778168)

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

**In-app purchases:** none


### HL7 CRAYFISH

[App page](https://appshunter.io/ios/app/hl7-crayfish/id6742149862)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NEXT DOOR TRAIN free?

NEXT DOOR TRAIN is free to download, with no in-app purchases.

### Is HL7 CRAYFISH free?

HL7 CRAYFISH is free to download, with no in-app purchases.

### Do NEXT DOOR TRAIN or HL7 CRAYFISH have ads?

Neither NEXT DOOR TRAIN nor HL7 CRAYFISH shows ads.

### Which is updated more often, NEXT DOOR TRAIN or HL7 CRAYFISH?

NEXT DOOR TRAIN ships an update every 4 months, and HL7 CRAYFISH every 2 months. Most recently, NEXT DOOR TRAIN was updated on October 5, 2026 and HL7 CRAYFISH 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.*