# UDCast vs Special KB

The clearest difference is in-app purchases: UDCast at none against Special KB's 1. UDCast also leads on iOS requirement (15.6 vs 17.0). Special KB's advantage is update cadence (every 8 days vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Special KB sells 1 in-app purchase, starting at $1.99 per month. UDCast asks for nothing beyond the download.

UDCast ships an update every 2 months, Special KB every 8 days. The most recent releases landed on September 29, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | UDCast | Special KB |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 40.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 13 MB | 25 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Palabra Inc.](https://appshunter.io/developer/942962606) | [Enfour, Inc.](https://appshunter.io/developer/284965604) |

## What reviewers say

### UDCast

[App page](https://appshunter.io/ios/app/udcast/id899342269)

This application converts spoken words into on-screen captions and sign language interpretation. It also offers voice guidance through earphones, enhancing accessibility for users.

**Highlights:** Vocal recognition, On-screen captions, Sign language interpretation, Voice guidance output, Internet-based data download, Device testing function

**Features:** Vision Pro support

**In-app purchases:** none


### Special KB

[App page](https://appshunter.io/ios/app/special-kb/id6795414648)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Special KB subscription | $1.99 | per month |


## Frequently asked questions

### Is UDCast free?

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

### Is Special KB free?

Special KB is free to download, with in-app purchases available.

### Do UDCast or Special KB have ads?

Neither UDCast nor Special KB shows ads.

### Which is updated more often, UDCast or Special KB?

UDCast ships an update every 2 months, and Special KB every 8 days. Most recently, UDCast was updated on September 29, 2026 and Special KB on October 11, 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.*