# Bubbles TD vs Spire Bastion

The clearest difference is update cadence: Spire Bastion at fortnightly against Bubbles TD's every 17 months. Bubbles TD's advantage is iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Bubbles TD ships an update every 17 months, Spire Bastion fortnightly. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Bubbles TD | Spire Bastion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/spire-bastion/id6751479227/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 17 months | **Fortnightly** |
| Monetization | — | Ad-supported |
| Size | 14 MB | 359 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [GASP Mobile Games Inc](https://appshunter.io/developer/502025155) | [FutureBright Technology Company Limited](https://appshunter.io/developer/715337595) |

## What reviewers say

### Bubbles TD

[App page](https://appshunter.io/ios/app/bubbles-td/id1207021295)

**Features:** macOS Compatibility

**In-app purchases:** none


### Spire Bastion

[App page](https://appshunter.io/ios/app/spire-bastion/id6751479227)

Defend your Crystal Core from climbing enemies in this simple yet strategic tower defense game. Place heroes to auto-fight and utilize 3D terrain to your advantage. Enjoy a relaxing experience with light strategy and satisfying results.

**Highlights:** 3D terrain impacts gameplay, Light strategy with skill combos, Floor-by-floor progression, Hero placement and auto-fighting, Focus on calm decisions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Bubbles TD free?

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

### Is Spire Bastion free?

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

### Do Bubbles TD or Spire Bastion have ads?

Both Bubbles TD and Spire Bastion show ads.

### Which is updated more often, Bubbles TD or Spire Bastion?

Bubbles TD ships an update every 17 months, and Spire Bastion fortnightly. Most recently, Bubbles TD was updated on October 26, 2026 and Spire Bastion on October 22, 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.*