# CATS Input Method Pro vs Burrow Tunnel

The clearest difference is in-app purchases: CATS Input Method Pro at none against Burrow Tunnel's 1. Burrow Tunnel's advantage is update cadence (every 2 weeks vs every 24 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Burrow Tunnel sells 1 one-off in-app purchase. CATS Input Method Pro asks for nothing beyond the download.

CATS Input Method Pro ships an update every 24 months, Burrow Tunnel every 2 weeks. The most recent releases landed on September 28, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | CATS Input Method Pro | Burrow Tunnel |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 2 weeks** |
| Size | 7 MB | 45 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [YIU LEUNG RANDY CHAN](https://appshunter.io/developer/1474191447) | [鑫 姜](https://appshunter.io/developer/1893112777) |

## What reviewers say

### CATS Input Method Pro

[App page](https://appshunter.io/ios/app/cats-input-method-pro/id1523143711)

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

**In-app purchases:** none


### Burrow Tunnel

[App page](https://appshunter.io/ios/app/burrow-tunnel/id6764009166)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Burrow Pro | $14.99 | one-time |


## Frequently asked questions

### Is CATS Input Method Pro free?

CATS Input Method Pro is free to download, with no in-app purchases.

### Is Burrow Tunnel free?

Burrow Tunnel is free to download, with in-app purchases available.

### Do CATS Input Method Pro or Burrow Tunnel have ads?

Neither CATS Input Method Pro nor Burrow Tunnel shows ads.

### Which is updated more often, CATS Input Method Pro or Burrow Tunnel?

CATS Input Method Pro ships an update every 24 months, and Burrow Tunnel every 2 weeks. Most recently, CATS Input Method Pro was updated on September 28, 2026 and Burrow Tunnel on October 3, 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.*