# Gravity 6D vs DEC Opcodes

The clearest difference is price: DEC Opcodes at Free against Gravity 6D's $1.99. DEC Opcodes also leads on update cadence (every 8 days vs every 16 months) and ratings volume (3 vs 1). Gravity 6D's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 18.0). On rating, ads and device support there is nothing between them.

DEC Opcodes is free to download; Gravity 6D costs $1.99 up front. DEC Opcodes sells 1 one-off in-app purchase. Gravity 6D asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Gravity 6D against 5.0 for DEC Opcodes. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Gravity 6D ships an update every 16 months, DEC Opcodes every 8 days. The most recent releases landed on September 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Gravity 6D | DEC Opcodes |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/gravity-6d/id1620686014/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/dec-opcodes/id6760246055/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 8 days** |
| Monetization | Paid | **Free** |
| Size | 49 MB | 42 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Creetah Ltd.](https://appshunter.io/developer/1091214069) | [John Kennedy](https://appshunter.io/developer/284943103) |

## What reviewers say

### Gravity 6D

[App page](https://appshunter.io/ios/app/gravity-6d/id1620686014)

Explore advanced physics with this application that allows for the simulation of up to six-dimensional gravity. Customize simulation parameters, adjust speed and visuals, and save your creations for later review.

**Highlights:** 6D mass particle simulations, Customizable simulation setup, Adjustable simulation speed, Visual preference settings, Save simulations

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

**In-app purchases:** none


### DEC Opcodes

[App page](https://appshunter.io/ios/app/dec-opcodes/id6760246055)

Explore the instruction sets of legendary DEC computers like the PDP and VAX. This app provides detailed information on each instruction, historical context, and interactive lessons. Discover the machines that shaped modern computing.

**Highlights:** Instruction set reference, Historical context and photos, System specifications, Interactive assembly lessons, Search and filtering, Customizable themes, Simple assembler

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Me a Coffee | $0.99 | one-time |


## Frequently asked questions

### Is Gravity 6D free?

Gravity 6D costs $1.99, with no in-app purchases.

### Is DEC Opcodes free?

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

### Which has better reviews, Gravity 6D or DEC Opcodes?

Gravity 6D and DEC Opcodes are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Gravity 6D or DEC Opcodes have ads?

Neither Gravity 6D nor DEC Opcodes shows ads.

### Which is updated more often, Gravity 6D or DEC Opcodes?

Gravity 6D ships an update every 16 months, and DEC Opcodes every 8 days. Most recently, Gravity 6D was updated on September 26, 2026 and DEC Opcodes on October 7, 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.*