# Asteroid Close Approach vs CloudLabs Acetylene Synthesis

The clearest difference is price: CloudLabs Acetylene Synthesis at Free against Asteroid Close Approach's $1.99. CloudLabs Acetylene Synthesis also leads on iOS requirement (9.0 vs 14.0). Asteroid Close Approach's advantage is update cadence (every 4 weeks vs every 28 months). On ads, in-app purchases and device support there is nothing between them.

CloudLabs Acetylene Synthesis is free to download; Asteroid Close Approach costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Asteroid Close Approach ships an update every 4 weeks, CloudLabs Acetylene Synthesis every 28 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Asteroid Close Approach | CloudLabs Acetylene Synthesis |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 28 months |
| Monetization | Paid | — |
| Size | 34 MB | 85 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arpacore B.V.](https://appshunter.io/developer/1441928570) | [Jiovany Orozco](https://appshunter.io/developer/1114670847) |

## What reviewers say

### Asteroid Close Approach

[App page](https://appshunter.io/ios/app/asteroid-close-approach/id1562569488)

Get real-time updates on near-Earth asteroid close approaches, including dates, distances, and impact energies. Access NASA's Sentry database for collision predictions and use a built-in calculator to estimate asteroid mass and energy.

**Highlights:** Real-time asteroid data on Apple Watch, Comprehensive approach details, Access to NASA's Sentry database, Asteroid mass and energy calculator, Collision monitoring for the next century

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


### CloudLabs Acetylene Synthesis

[App page](https://appshunter.io/ios/app/cloudlabs-acetylene-synthesis/id1596481280)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Asteroid Close Approach free?

Asteroid Close Approach costs $1.99, with no in-app purchases.

### Is CloudLabs Acetylene Synthesis free?

CloudLabs Acetylene Synthesis is free to download, with no in-app purchases.

### Do Asteroid Close Approach or CloudLabs Acetylene Synthesis have ads?

Neither Asteroid Close Approach nor CloudLabs Acetylene Synthesis shows ads.

### Which is updated more often, Asteroid Close Approach or CloudLabs Acetylene Synthesis?

Asteroid Close Approach ships an update every 4 weeks, and CloudLabs Acetylene Synthesis every 28 months. Most recently, Asteroid Close Approach was updated on October 27, 2026 and CloudLabs Acetylene Synthesis on October 27, 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.*