# Sphere TD vs Echo Planet

The clearest difference is rating: Echo Planet at 4.9 against Sphere TD's 4.6. On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Sphere TD sells 10 one-off in-app purchases and Echo Planet sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Echo Planet holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 10 and 23 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Sphere TD ships an update every 2 days, Echo Planet every 3 days. The most recent releases landed on November 9, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Sphere TD | Echo Planet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (10 ratings)](https://appshunter.io/ios/app/sphere-td/id6753674090/reviews) | **[4.9 (23 ratings)](https://appshunter.io/ios/app/echo-planet-incremental-game/id6756530491/reviews)** |
| Number of ratings | 10 | **23** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 317 MB | 96 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [StandardIssueGames](https://appshunter.io/developer/1844319777) | [Mustafa Mohammed](https://appshunter.io/developer/967586964) |

## What reviewers say

### Sphere TD

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

A unique tower defense game where you craft every tower by combining mods to create custom projectile-spamming defenses. Explore maps, research new abilities, and defend your flying base against various enemy types. Enjoy offline play and cross-platform compatibility.

**Highlights:** Build and mod every tower, Combine mods for millions of tower builds, Defend maps with up to 5 maxed towers, Research and craft mods, Flying base exploration and ore mining, Offline play with cloud sync, Cross-platform mobile and desktop support

**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 |


### Echo Planet

[App page](https://appshunter.io/ios/app/echo-planet-incremental-game/id6756530491)

Transform a planet into a star by forging moons that channel power to its core. Upgrade your celestial bodies, stack multipliers, and witness your energy output grow exponentially, even when you're not actively playing. This idle game offers a satisfying progression from small sparks to galaxy-scale power.

**Highlights:** Forge moons to power a planetary core, Upgrade moons and stack multipliers, Idle progression, play offline, Watch signal surge from sparks to galaxy-scale, Transform planet into a star

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gold Supporter Pack | $2.99 | one-time |
| Diamond Supporter Pack | $5.99 | one-time |


## Frequently asked questions

### Is Sphere TD free?

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

### Is Echo Planet free?

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

### Which has better reviews, Sphere TD or Echo Planet?

Echo Planet is rated higher. Sphere TD averages 4.6 out of 5 from 10 ratings, while Echo Planet averages 4.9 from 23 ratings.

### Do Sphere TD or Echo Planet have ads?

Both Sphere TD and Echo Planet show ads.

### Which is updated more often, Sphere TD or Echo Planet?

Sphere TD ships an update every 2 days, and Echo Planet every 3 days. Most recently, Sphere TD was updated on November 9, 2026 and Echo Planet on November 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.*