# LEO UCR vs HIV Antibody Database

The clearest difference is update cadence: LEO UCR at every 6 months against HIV Antibody Database's every 33 months. HIV Antibody Database's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

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

LEO UCR ships an update every 6 months, HIV Antibody Database every 33 months. The most recent releases landed on October 26, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | LEO UCR | HIV Antibody Database |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hiv-antibody-database/id1232472905/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 33 months |
| Monetization | — | Free |
| Size | 5 MB | 10 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Calvin You](https://appshunter.io/developer/595458601) | [Zentropy Software](https://appshunter.io/developer/289446244) |

## What reviewers say

### LEO UCR

[App page](https://appshunter.io/ios/app/leo-ucr/id1229509846)

**Features:** macOS Compatibility

**In-app purchases:** none


### HIV Antibody Database

[App page](https://appshunter.io/ios/app/hiv-antibody-database/id1232472905)

This reference tool provides scientists with quick access to sequence, structure, and neutralization data for anti-HIV antibodies and the HIV-1 strains they target. It aids HIV vaccine research by offering insights into antibody development and recognition.

**Highlights:** Antibody sequence data, Antibody structure data, Neutralization data, HIV-1 strain recognition, Reference for vaccine research

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

**In-app purchases:** none


## Frequently asked questions

### Is LEO UCR free?

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

### Is HIV Antibody Database free?

HIV Antibody Database is free to download, with no in-app purchases.

### Do LEO UCR or HIV Antibody Database have ads?

Neither LEO UCR nor HIV Antibody Database shows ads.

### Which is updated more often, LEO UCR or HIV Antibody Database?

LEO UCR ships an update every 6 months, and HIV Antibody Database every 33 months. Most recently, LEO UCR was updated on October 26, 2026 and HIV Antibody Database on November 2, 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.*