# Idle Energy Empire vs Gravity

The clearest difference is ads: Gravity at none against Idle Energy Empire's shown. Idle Energy Empire's advantage is iOS requirement (13.0 vs 15.1). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Idle Energy Empire sells 10 one-off in-app purchases and Gravity sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Idle Energy Empire ships an update every 3 days, Gravity daily. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Idle Energy Empire | Gravity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (144 ratings)](https://appshunter.io/ios/app/idle-energy-empire/id6737407950/reviews)** | — |
| Number of ratings | **144** | — |
| Positive reviews | 40.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 273 MB | 66 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [SOZAP](https://appshunter.io/developer/952456051) | [IVF Parentium](https://appshunter.io/developer/6786201592) |

## What reviewers say

### Idle Energy Empire

[App page](https://appshunter.io/ios/app/idle-energy-empire/id6737407950)

Build and manage an energy empire in a post-apocalyptic wasteland. Harvest resources, produce batteries, upgrade machines, and defend your factory from zombie hordes. Expand your operations and connect the grid to survive and thrive.

**Highlights:** Resource management, Machine upgrades, Battery production, Electric train logistics, Grid connection gameplay, Zombie defense, Factory expansion

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Pack | $0.99 | one-time |
| Few gems | $1.99 | one-time |
| Gem Pack Offer | $1.99 | one-time |
| Starter Pack | $2.99 | one-time |
| Factory 2 Offer | $4.99 | one-time |
| Gems pack 2 | $4.99 | one-time |
| Starter Pack | $4.99 | one-time |
| Factory 3 Offer | $6.99 | one-time |
| Gem pack 3 | $9.99 | one-time |
| Gem pack 5 | $19.99 | one-time |

**What reviewers like**

- 👍 No ads
- 🚀 Smooth gameplay
- 💡 Promotes awareness about clean energy
- 👍 Relaxing yet challenging
- 💡 Competitive edge with energy trading

**What reviewers complain about**

- 🐛 Button to progress not working
- 🐛 Glitchy opening animation
- 🐛 Tasks not visible on small screens
- 🔋 Frequent ads interrupting flow

**Reported bugs**

- Button to upgrade factory not working
- Stuck at loading screen
- Unable to progress past first factory

**Requested features**

- Add more factories (4, 5, 6)
- Paid version to remove ads
- Ability to scroll or resize tasks


### Gravity

[App page](https://appshunter.io/ios/app/gravity-lander/id6789910779)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 4 Cores + 300 Credits | $0.99 | one-time |
| 9 Cores + 800 Credits | $4.99 | one-time |
| 16 Cores + 1,400 Credits | $9.99 | one-time |


## Frequently asked questions

### Is Idle Energy Empire free?

Idle Energy Empire is free to download, with in-app purchases available.

### Is Gravity free?

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

### Do Idle Energy Empire or Gravity have ads?

Idle Energy Empire shows ads; Gravity does not.

### Which is updated more often, Idle Energy Empire or Gravity?

Idle Energy Empire ships an update every 3 days, and Gravity daily. Most recently, Idle Energy Empire was updated on November 4, 2026 and Gravity on November 5, 2026.

---

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