# Bubbles TD vs Collect Letters!

The clearest difference is in-app purchases: Bubbles TD at none against Collect Letters!'s 10. Bubbles TD also leads on iOS requirement (9.0 vs 12.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Collect Letters! sells 10 one-off in-app purchases. Bubbles TD asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 17 months. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Bubbles TD | Collect Letters! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 17 months | Every 17 months |
| Size | 14 MB | 157 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GASP Mobile Games Inc](https://appshunter.io/developer/502025155) | [Rootcraft](https://appshunter.io/developer/1370994577) |

## What reviewers say

### Bubbles TD

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Collect Letters!

[App page](https://appshunter.io/ios/app/collect-letters/id6462407299)

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3,000 Gems | $1.99 | one-time |
| 1,500 Cards | $1.99 | one-time |
| 1,000,000 Coins | $1.99 | one-time |
| 5,000 Gems | $2.99 | one-time |
| 8,000 Cards | $3.99 | one-time |
| 8,000 Gems | $3.99 | one-time |
| 16,000 Gems | $4.99 | one-time |
| 60,000 Cards | $5.99 | one-time |
| 50,000 Gems | $5.99 | one-time |
| 120,000 Gems | $6.99 | one-time |


## Frequently asked questions

### Is Bubbles TD free?

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

### Is Collect Letters! free?

Collect Letters! is free to download, with in-app purchases available.

### Do Bubbles TD or Collect Letters! have ads?

Both Bubbles TD and Collect Letters! show ads.

### Which is updated more often, Bubbles TD or Collect Letters!?

Bubbles TD ships an update every 17 months, and Collect Letters! every 17 months. Most recently, Bubbles TD was updated on October 26, 2026 and Collect Letters! on October 7, 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.*