# Who's in Space? vs NextUpReef

The clearest difference is review sentiment: Who's in Space? at 100% against NextUpReef's 50%. Who's in Space? also leads on rating (5.0 vs 3.7) and in-app purchases (none vs 2). NextUpReef's advantage is update cadence (every 4 days vs every 4 months) and ratings volume (3 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. NextUpReef sells 2 in-app purchases, starting at $4.99 per month. Who's in Space? asks for nothing beyond the download.

Who's in Space? holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 100% of Who's in Space?'s written reviews are positive against 50% of NextUpReef's.

Who's in Space? ships an update every 4 months, NextUpReef every 4 days. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Who's in Space? | NextUpReef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/whos-in-space/id916499517/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/nextupreef/id6760728959/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | **Free** | Freemium |
| Size | 0 MB | 59 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Cameron Bernhardt](https://appshunter.io/developer/916499516) | [Adam Winstead](https://appshunter.io/developer/1885950916) |

## What reviewers say

### Who's in Space?

[App page](https://appshunter.io/ios/app/whos-in-space/id916499517)

Discover the current number of astronauts in orbit and their locations. Tap on an astronaut's name to access more detailed information about their mission.

**Highlights:** Real-time astronaut count, Astronaut location tracking, Detailed astronaut information, Data from Open Notify Astros API, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### NextUpReef

[App page](https://appshunter.io/ios/app/nextupreef/id6760728959)

This app helps reef tank hobbyists manage their aquarium's health and equipment. It offers AI-powered analysis, parameter logging, smart outlet control, and community insights to optimize tank conditions and simplify maintenance.

**Highlights:** AI Reef Advisor for tank analysis, Parameter logging and trend charting, Smart outlet control for equipment, Neptune Apex integration, Tank setup and livestock tracking, Smart reminders for maintenance, Reef community insights

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NextUpReef Pro | $4.99 | per month |
| NextUpReef Pro | $39.99 | per year |


## Frequently asked questions

### Is Who's in Space? free?

Who's in Space? is free to download, with no in-app purchases.

### Is NextUpReef free?

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

### Which has better reviews, Who's in Space? or NextUpReef?

Who's in Space? is rated higher. Who's in Space? averages 5.0 out of 5 from 1 ratings, while NextUpReef averages 3.7 from 3 ratings.

### Do Who's in Space? or NextUpReef have ads?

Neither Who's in Space? nor NextUpReef shows ads.

### Which is updated more often, Who's in Space? or NextUpReef?

Who's in Space? ships an update every 4 months, and NextUpReef every 4 days. Most recently, Who's in Space? was updated on October 12, 2026 and NextUpReef on October 13, 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.*