# ECHO LED vs Image to PDF

The clearest difference is in-app purchases: ECHO LED at none against Image to PDF's 2. ECHO LED also leads on update cadence (every 5 weeks vs every 7 months) and iOS requirement (8.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Image to PDF sells 2 in-app purchases, starting at $1.99 per 7 days. ECHO LED asks for nothing beyond the download.

ECHO LED ships an update every 5 weeks, Image to PDF every 7 months. The most recent releases landed on September 21, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ECHO LED | Image to PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (2 ratings)](https://appshunter.io/ios/app/echo-led/id1029736620/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | Free | — |
| Size | 11 MB | 11 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [勇强 夏](https://appshunter.io/developer/1043457850) | [Huseyin Bagana](https://appshunter.io/developer/1537624907) |

## What reviewers say

### ECHO LED

[App page](https://appshunter.io/ios/app/echo-led/id1029736620)

Control LED lights using Bluetooth. Features include color selection from photos, music synchronization, microphone interaction, and customizable lighting modes. Set timers for automated lighting.

**Highlights:** Bluetooth 4.0 connectivity, Color selection via camera or photo album, Music synchronized lighting, Microphone acoustic interaction, Timer settings, Static and dynamic mode settings

**Features:** macOS Compatibility

**In-app purchases:** none


### Image to PDF

[App page](https://appshunter.io/ios/app/image-to-pdf-convert-pdf/id6760184856)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Yearly - Best Value | $9.99 | per year |


## Frequently asked questions

### Is ECHO LED free?

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

### Is Image to PDF free?

Image to PDF is free to download, with in-app purchases available.

### Do ECHO LED or Image to PDF have ads?

Neither ECHO LED nor Image to PDF shows ads.

### Which is updated more often, ECHO LED or Image to PDF?

ECHO LED ships an update every 5 weeks, and Image to PDF every 7 months. Most recently, ECHO LED was updated on September 21, 2026 and Image to PDF on October 14, 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.*