# Alien Motion Detector vs Not From Earth

The clearest difference is rating: Not From Earth at 5.0 against Alien Motion Detector's 3.9. Alien Motion Detector's advantage is monetization model (free vs paid) and update cadence (every 6 weeks vs every 6 months). On price, ads, in-app purchases and device support there is nothing between them.

Alien Motion Detector costs $1.99 and Not From Earth $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Not From Earth holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Alien Motion Detector has 31 ratings behind it against 2, so its average is the more settled of the two.

Alien Motion Detector ships an update every 6 weeks, Not From Earth every 6 months. The most recent releases landed on October 26, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Alien Motion Detector | Not From Earth |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | [3.9 (31 ratings)](https://appshunter.io/ios/app/alien-motion-detector/id578146041/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/not-from-earth/id1358026687/reviews)** |
| Number of ratings | **31** | 2 |
| Positive reviews | 66.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 6 months |
| Monetization | **Free** | Paid |
| Size | 30 MB | 502 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Joey To](https://appshunter.io/developer/578146044) | [XMLAuthor Inc](https://appshunter.io/developer/640473425) |

## What reviewers say

### Alien Motion Detector

[App page](https://appshunter.io/ios/app/alien-motion-detector/id578146041)

This app is for entertainment purposes only, simulating alien detection. Users can place and interact with virtual aliens on their screen, watching them move and react. It utilizes device gyroscopes for an interactive experience.

**Highlights:** Simulated alien motion detection, Place and draw virtual aliens, Aliens swarm to your location, Adjust alien behavior (count, speed, lifetime), Gyroscope-controlled interaction

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

**In-app purchases:** none

**What reviewers like**

- 🎵 Authentic sounds
- 🤩 Fan favorite
- 💯 Faithful representation
- 🎮 Fun for role-playing
- 💡 Good idea, well-executed

**What reviewers complain about**

- 💸 Overpriced for features
- 🐌 Slow ping/tracking
- 🚫 No sound reported
- 📱 Not working on newer iPhones
- 👎 Basic functionality

**Reported bugs**

- No audio/sound
- Won't add to watch screen
- Placing aliens on screen not working
- Can't add beeping sound
- Doesn't work on iPhone XS Max

**Requested features**

- Auto-generated movement setting
- Add Bluetooth detection for friends
- Integrate with location services
- Record feature
- Higher pitch sound as aliens get closer


### Not From Earth

[App page](https://appshunter.io/ios/app/not-from-earth/id1358026687)

Transform photos of people into aliens with a variety of effects and backgrounds. Share your alien discoveries with friends and family, complete with a certificate of discovery. Enjoy free updates and no advertisements.

**Highlights:** Alien photo transformation, Hundreds of free effects, Backgrounds included, Shareable discovery certificates, Free lifetime updates, No ads or addons

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Alien Motion Detector free?

Alien Motion Detector costs $1.99, with no in-app purchases.

### Is Not From Earth free?

Not From Earth costs $1.99, with no in-app purchases.

### Which has better reviews, Alien Motion Detector or Not From Earth?

Not From Earth is rated higher. Alien Motion Detector averages 3.9 out of 5 from 31 ratings, while Not From Earth averages 5.0 from 2 ratings.

### Do Alien Motion Detector or Not From Earth have ads?

Neither Alien Motion Detector nor Not From Earth shows ads.

### Which is updated more often, Alien Motion Detector or Not From Earth?

Alien Motion Detector ships an update every 6 weeks, and Not From Earth every 6 months. Most recently, Alien Motion Detector was updated on October 26, 2026 and Not From Earth on October 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*