# Celestia vs Never Forget 9

The clearest difference is in-app purchases: Never Forget 9 at none against Celestia's 4. Never Forget 9 also leads on rating (4.6 vs 4.4). Celestia's advantage is update cadence (fortnightly vs every 10 months). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Celestia sells 4 in-app purchases, starting at $0.99 per 7 days. Never Forget 9 asks for nothing beyond the download.

Never Forget 9 holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 338 and 287 respectively. Written reviews complicate that: 79% of Celestia's written reviews are positive against 74% of Never Forget 9's, so the app with the better star average is not the one people write more warmly about.

Celestia ships an update fortnightly, Never Forget 9 every 10 months. The most recent releases landed on October 27, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Celestia | Never Forget 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (338 ratings)](https://appshunter.io/ios/app/celestia-space-simulator/id1500434829/reviews) | **[4.6 (287 ratings)](https://appshunter.io/ios/app/never-forget-9-11/id1527769820/reviews)** |
| Number of ratings | **338** | 287 |
| Positive reviews | **78.9% of reviews** | 74.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 10 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 550 MB | 16 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [林峰 李](https://appshunter.io/developer/1186547508) | [DeerBrain LLC](https://appshunter.io/developer/1478334114) |

## What reviewers say

### Celestia

[App page](https://appshunter.io/ios/app/celestia-space-simulator/id1500434829)

Explore the universe in real-time 3D. Visit planets, moons, star clusters, and galaxies, viewing them from any point in space and time. Customize your experience with expandable content and detailed simulations.

**Highlights:** Real-time 3D space visualization, Explore planets, moons, stars, galaxies, Accurate solar system object positions, Interactive planetarium mode, Expandable content with add-ons, Customizable celestial databases

**Features:** Game Controller support, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Celestia PLUS (Weekly) | $0.99 | per 7 days |
| Celestia PLUS (Monthly) | $1.99 | per month |
| Celestia PLUS (Yearly) | $19.99 | per year |
| Celestia PLUS (Lifetime) | $79.99 | one-time |

**What reviewers like**

- ⭐ Realistic space simulation
- 🌌 Ability to explore galaxies and star systems
- 🔍 Detailed planet and moon textures
- 📷 Great for taking screenshots
- 🤖 Reminds users of Space Engine

**What reviewers complain about**

- 🐛 Occasional crashes and glitches
- 🌌 Limited exploration beyond Milky Way and Andromeda
- 🌍 Flat terrain on planets
- 🔍 Lack of detail on some celestial objects
- 🔒 Paywall for some features

**Reported bugs**

- Milky Way and other galaxy textures not loading properly
- Crashes when using certain add-ons
- Issues with planet and moon orbits not being accurate

**Requested features**

- Add more exoplanets and distant star systems
- Implement terrain generation for planets
- Expand to include more galaxies and the overall universe structure
- Add support for black holes, pulsars, and other exotic objects
- Improve controls and camera movement


### Never Forget 9

[App page](https://appshunter.io/ios/app/never-forget-9-11/id1527769820)

This app helps you remember the events of September 11, 2001. It provides facts about the day and sends push notifications to mark the exact times of key historical moments.

**Highlights:** Remember 9/11 events, Learn facts about the day, Receive timed push notifications, Mark key event times

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

**In-app purchases:** none

**What reviewers like**

- 👍 Great reminder app
- 👍 Helps remember 9/11
- 👍 Honors lost lives
- 👍 Shows what happened
- 👍 Awesome app

**What reviewers complain about**

- 🐛 Time is an hour behind
- 🐛 Wrong date displayed
- 🐛 Alarms don't go off
- 🐛 No notifications received
- 🐛 No alert sounds

**Reported bugs**

- Time is one hour behind
- Wrong date displayed
- Alarms only go off on September 11
- No alarms went off
- App didn't work

**Requested features**

- Add video of attacks
- Fix time zone issue
- Add Siren Head next to South Tower


## Frequently asked questions

### Is Celestia free?

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

### Is Never Forget 9 free?

Never Forget 9 is free to download, with no in-app purchases.

### Which has better reviews, Celestia or Never Forget 9?

Never Forget 9 is rated higher. Celestia averages 4.4 out of 5 from 338 ratings, while Never Forget 9 averages 4.6 from 287 ratings.

### Do Celestia or Never Forget 9 have ads?

Neither Celestia nor Never Forget 9 shows ads.

### Which is updated more often, Celestia or Never Forget 9?

Celestia ships an update fortnightly, and Never Forget 9 every 10 months. Most recently, Celestia was updated on October 27, 2026 and Never Forget 9 on October 22, 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.*