# Sphere TD vs Idle Polygon

The clearest difference is review sentiment: Sphere TD at 100% against Idle Polygon's 50%. Sphere TD also leads on rating (4.6 vs 3.0) and update cadence (every 2 days vs every 4 days). Idle Polygon's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Sphere TD sells 10 one-off in-app purchases and Idle Polygon sells 7 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Sphere TD holds the better App Store score, 4.6 against 3.0. Both are backed by a comparable volume of ratings — 9 and 4 respectively. Written reviews point the same way: 100% of Sphere TD's written reviews are positive against 50% of Idle Polygon's.

Sphere TD ships an update every 2 days, Idle Polygon every 4 days. Both last shipped on October 5, 2026.

## The numbers

| Metric | Sphere TD | Idle Polygon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/sphere-td/id6753674090/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/idle-polygon/id6758945143/reviews) |
| Number of ratings | **9** | 4 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 4 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 332 MB | 200 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [StandardIssueGames](https://appshunter.io/developer/1844319777) | [KOKI MORITA](https://appshunter.io/developer/1875902049) |

## What reviewers say

### Sphere TD

[App page](https://appshunter.io/ios/app/sphere-td/id6753674090)

A complex tower defense game where you build and upgrade towers to defend against waves of spheres. Strategize with deep customization, resource management, and research to overcome challenges. Offers extensive replayability with numerous levels and modes.

**Highlights:** Tower and projectile customization, 30 base towers with 28+ stats, 33 mods with millions of combinations, Research and crafting system, Tower inventory and energy management, 50 hand-crafted levels and endless mode, Offline and online play with cloud sync

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Au Field Ration | $4.99 | one-time |
| Defender Starter Pack | $7.99 | one-time |
| Au Supply Cache | $9.99 | one-time |
| Galatium Express Token | $9.99 | one-time |
| Galatium Academy Pack | $14.99 | one-time |
| Shadow Broker Vantage | $19.99 | one-time |
| Au Enterprise Fund | $24.99 | one-time |
| Flux Enrichment Grant | $24.99 | one-time |
| Au Strategic Stockpile | $49.99 | one-time |
| Au Global Reserve | $99.99 | one-time |


### Idle Polygon

[App page](https://appshunter.io/ios/app/idle-polygon/id6758945143)

Engage in a visually stunning incremental game with RPG battle elements. Upgrade your geometries and income to astronomical levels, and master prestige cycles for endless replayability.

**Highlights:** Mesmerizing geometric visuals, Incremental upgrades and income, RPG battles with strategic gameplay, Endless replayability with prestige cycles, Hypnotic art style

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diamond S | $0.99 | one-time |
| Diamond M | $2.99 | one-time |
| Offline Boost | $3.99 | one-time |
| Remove Ads | $4.99 | one-time |
| Diamond L | $5.99 | one-time |
| Diamond XL | $29.99 | one-time |
| Diamond MAX | $59.99 | one-time |


## Frequently asked questions

### Is Sphere TD free?

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

### Is Idle Polygon free?

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

### Which has better reviews, Sphere TD or Idle Polygon?

Sphere TD is rated higher. Sphere TD averages 4.6 out of 5 from 9 ratings, while Idle Polygon averages 3.0 from 4 ratings.

### Do Sphere TD or Idle Polygon have ads?

Both Sphere TD and Idle Polygon show ads.

### Which is updated more often, Sphere TD or Idle Polygon?

Sphere TD ships an update every 2 days, and Idle Polygon every 4 days. Most recently, Sphere TD was updated on October 5, 2026 and Idle Polygon on October 5, 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.*