# My Device ID by AppsFlyer vs Preserve by MultiSync

The clearest difference is rating: Preserve by MultiSync at 5.0 against My Device ID by AppsFlyer's 3.8. My Device ID by AppsFlyer's advantage is update cadence (every 8 days vs every 6 weeks) and ratings volume (41 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Preserve by MultiSync holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: My Device ID by AppsFlyer has 41 ratings behind it against 1, so its average is the more settled of the two.

My Device ID by AppsFlyer ships an update every 8 days, Preserve by MultiSync every 6 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | My Device ID by AppsFlyer | Preserve by MultiSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (41 ratings)](https://appshunter.io/ios/app/my-device-id-by-appsflyer/id1192323960/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/preserve-by-multisync/id6760274059/reviews)** |
| Number of ratings | **41** | 1 |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 11 MB | 1 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [AppsFlyer](https://appshunter.io/developer/1192323959) | [MultiSync Inc.](https://appshunter.io/developer/1435027043) |

## What reviewers say

### My Device ID by AppsFlyer

[App page](https://appshunter.io/ios/app/my-device-id-by-appsflyer/id1192323960)

Easily view and share your device identifiers, including IDFA and IDFV. This tool allows you to quickly whitelist your device as a test device within your AppsFlyer account, crucial for SDK integration testing.

**Highlights:** View Device ID (IDFA, IDFV), Share Device ID, Whitelist test device for AppsFlyer, Directly add device to AppsFlyer account, Facilitates SDK integration testing

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

**In-app purchases:** none


### Preserve by MultiSync

[App page](https://appshunter.io/ios/app/preserve-by-multisync/id6760274059)

This tool assists transplant clinicians and specialists in selecting the optimal organ preservation method and device. It provides evidence-based recommendations, calculates donor risk scores, and offers outcome predictions, all while ensuring data privacy and offline functionality.

**Highlights:** Organ preservation method recommendations, Preservation device suggestions, Donor risk score calculation, Outcome predictions, Offline functionality, Pseudonymous assessment saving

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

**In-app purchases:** none


## Frequently asked questions

### Is My Device ID by AppsFlyer free?

My Device ID by AppsFlyer is free to download, with no in-app purchases.

### Is Preserve by MultiSync free?

Preserve by MultiSync is free to download, with no in-app purchases.

### Which has better reviews, My Device ID by AppsFlyer or Preserve by MultiSync?

Preserve by MultiSync is rated higher. My Device ID by AppsFlyer averages 3.8 out of 5 from 41 ratings, while Preserve by MultiSync averages 5.0 from 1 ratings.

### Do My Device ID by AppsFlyer or Preserve by MultiSync have ads?

Neither My Device ID by AppsFlyer nor Preserve by MultiSync shows ads.

### Which is updated more often, My Device ID by AppsFlyer or Preserve by MultiSync?

My Device ID by AppsFlyer ships an update every 8 days, and Preserve by MultiSync every 6 weeks. Most recently, My Device ID by AppsFlyer was updated on November 2, 2026 and Preserve by MultiSync on October 31, 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.*