# Off the Rails® vs Night Zookeeper

The clearest difference is price: Night Zookeeper at Free against Off the Rails®'s $1.99. Night Zookeeper also leads on rating (4.6 vs 4.3) and ratings volume (592 vs 79). Off the Rails®'s advantage is in-app purchases (none vs 12) and iOS requirement (8.0 vs 15.0). On review sentiment, update cadence, ads and device support there is nothing between them.

Night Zookeeper is free to download; Off the Rails® costs $1.99 up front. Night Zookeeper sells 12 in-app purchases, starting at $14.99 per month. Off the Rails® asks for nothing beyond the download.

Night Zookeeper holds the better App Store score, 4.6 against 4.3. That said, the two scores are not equally well evidenced: Night Zookeeper has 592 ratings behind it against 79, so its average is the more settled of the two. Written reviews point the same way: 81% of Off the Rails®'s written reviews are positive against 83% of Night Zookeeper's.

Off the Rails® ships an update every 6 weeks, Night Zookeeper every 2 months. Both last shipped on October 20, 2026.

## The numbers

| Metric | Off the Rails® | Night Zookeeper |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.3 (79 ratings)](https://appshunter.io/ios/app/off-the-rails/id928000230/reviews) | **[4.6 (592 ratings)](https://appshunter.io/ios/app/night-zookeeper-fun-learning/id6504489937/reviews)** |
| Number of ratings | 79 | **592** |
| Positive reviews | 80.6% of reviews | **82.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Paid** | Subscription |
| Size | 121 MB | 378 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Freecloud Design, Inc.](https://appshunter.io/developer/324355664) | [Wonky Star](https://appshunter.io/developer/573502316) |

## What reviewers say

### Off the Rails®

[App page](https://appshunter.io/ios/app/off-the-rails/id928000230)

Design and build roller coasters in real-time by tilting your device. Create thrilling loops, corkscrews, and jumps while completing numerous objectives. Explore a learning section to understand the physics behind roller coaster design.

**Highlights:** Real-time roller coaster building, Tilt-based controls, 75+ game objectives, 14 vehicle options, Roller coaster physics learning section, Save and ride creations, 3D physics simulator

**Features:** macOS Compatibility

**In-app purchases:** none


### Night Zookeeper

[App page](https://appshunter.io/ios/app/night-zookeeper-fun-learning/id6504489937)

This app makes reading and writing fun for children aged 6-12. It offers mini-games, video lessons, and skill challenges covering a full English language arts curriculum. Children receive personalized feedback from tutors and earn rewards, while parents can track progress.

**Highlights:** Interactive mini-games, Video lessons, Skill challenges, Tutor feedback on writing, Parent progress tracking, Motivating rewards, Collaborative writing opportunities

**Features:** macOS Compatibility

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NZK 1 Month - 1 License | $14.99 | per month |
| 1 Month - 2 Licenses | $17.99 | per month |
| NZK 1 Month - 3 Licenses | $17.99 | per month |
| 1 Month - 4 Licenses | $21.99 | per month |
| 3 Months - 1 License | $36.99 | per 3 months |
| 3 Months - 2 Licenses | $49.99 | per 3 months |
| 3 Months - 3 Licenses | $49.99 | per 3 months |
| Yearly - 1 License | $118.99 | per year |
| Yearly - 2 Licenses | $154.99 | per year |
| Yearly - 3 Licenses | $154.99 | per year |
| Yearly - 4 Licenses | $189.99 | per year |
| Yearly - 5 Licenses | $239.99 | per year |

**What reviewers like**

- 👍 Fun and engaging
- 🚀 Helps improve writing skills
- 💡 Gamifies learning
- 👍 Motivates reluctant writers
- 👍 Constructive feedback from tutors

**What reviewers complain about**

- 🐛 Glitchy and laggy performance
- 🐛 Inconsistent difficulty levels
- 🔋 Drains device battery
- 🔒 Questionable subscription practices

**Reported bugs**

- Freezing and crashing issues
- Upside-down screen when creating new characters
- Audio not working consistently

**Requested features**

- Dark mode option
- Compatibility improvements for older devices
- More content for older age groups


## Frequently asked questions

### Is Off the Rails® free?

Off the Rails® costs $1.99, with no in-app purchases.

### Is Night Zookeeper free?

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

### Which has better reviews, Off the Rails® or Night Zookeeper?

Night Zookeeper is rated higher. Off the Rails® averages 4.3 out of 5 from 79 ratings, while Night Zookeeper averages 4.6 from 592 ratings.

### Do Off the Rails® or Night Zookeeper have ads?

Neither Off the Rails® nor Night Zookeeper shows ads.

### Which is updated more often, Off the Rails® or Night Zookeeper?

Off the Rails® ships an update every 6 weeks, and Night Zookeeper every 2 months. Most recently, Off the Rails® was updated on October 20, 2026 and Night Zookeeper on October 20, 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.*