# Spark vs Upload Simulator 2

The clearest difference is price: Spark at Free against Upload Simulator 2's $3.99. Spark also leads on rating (4.8 vs 4.4) and review sentiment (94% vs 80%). Upload Simulator 2's advantage is update cadence (every 2 days vs every 3 weeks). On ads, in-app purchases and device support there is nothing between them.

Spark is free to download; Upload Simulator 2 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Spark holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Spark has 233 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 94% of Spark's written reviews are positive against 80% of Upload Simulator 2's.

Spark ships an update every 3 weeks, Upload Simulator 2 every 2 days. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Spark | Upload Simulator 2 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.8 (233 ratings)](https://appshunter.io/ios/app/spark-idle-evolution/id1437753286/reviews)** | [4.4 (18 ratings)](https://appshunter.io/ios/app/upload-simulator-2/id6474804328/reviews) |
| Number of ratings | **233** | 18 |
| Positive reviews | **94.3% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 75 MB | 125 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Deuski Games Limited Liability Company](https://appshunter.io/developer/1437753284) | [EnigmaDev Studios](https://appshunter.io/developer/1722551461) |

## What reviewers say

### Spark

[App page](https://appshunter.io/ios/app/spark-idle-evolution/id1437753286)

Guide the evolution of the cosmos as an ethereal Spark of Life. Assimilate raw materials and influence cosmic development through incremental gameplay. Unlock resources, progress through story elements, and utilize a prestige mechanic for faster advancement.

**Highlights:** Multiple unlockable and upgradeable resources, Story elements that unfold with progress, Prestige mechanic for accelerated progression, Altar of Knowledge for powerful upgrades, Intuitive UI with organic learning, Optional ads for in-game bonuses

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Addictive gameplay
- 👍 Enjoyable idle game
- 👍 Good pacing
- 👍 Interesting story
- 👍 Relaxing experience

**What reviewers complain about**

- 🐢 Slow progression at times
- 🤔 UI could use work
- 🤷 No visuals change
- ⏳ May take forever to progress

**Reported bugs**

- Ad not loading
- Game broke (production NaN, destruction bonus INF)

**Requested features**

- More updates
- Continue the story
- Add more evolution upgrades
- Add something at the end (e.g., restart with multiplier)
- Pay to have 2X multiplier forever


### Upload Simulator 2

[App page](https://appshunter.io/ios/app/upload-simulator-2/id6474804328)

Simulate the process of uploading data to earn credits, upgrade your hardware, and research new technologies. Discover unique artifacts, craft modules, and customize your operating system with themes and wallpapers.

**Highlights:** GPU mining for credits, Upgrade hardware setup, Research new technologies, Craft modules, Customize OS with themes, Discover unique artifacts

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Spark free?

Spark is free to download, with no in-app purchases.

### Is Upload Simulator 2 free?

Upload Simulator 2 costs $3.99, with no in-app purchases.

### Which has better reviews, Spark or Upload Simulator 2?

Spark is rated higher. Spark averages 4.8 out of 5 from 233 ratings, while Upload Simulator 2 averages 4.4 from 18 ratings.

### Do Spark or Upload Simulator 2 have ads?

Neither Spark nor Upload Simulator 2 shows ads.

### Which is updated more often, Spark or Upload Simulator 2?

Spark ships an update every 3 weeks, and Upload Simulator 2 every 2 days. Most recently, Spark was updated on October 5, 2026 and Upload Simulator 2 on October 1, 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.*