# San Mateo County Libraries vs EYEnstein

The clearest difference is update cadence: EYEnstein at monthly against San Mateo County Libraries's every 2 months. 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.

San Mateo County Libraries ships an update every 2 months, EYEnstein monthly. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | San Mateo County Libraries | EYEnstein |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (8 ratings)](https://appshunter.io/ios/app/san-mateo-county-libraries/id1371647186/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 47.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free | — |
| Size | 50 MB | 38 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Peninsula Library System](https://appshunter.io/developer/692170824) | [Plunjr](https://appshunter.io/developer/1463049661) |

## What reviewers say

### San Mateo County Libraries

[App page](https://appshunter.io/ios/app/san-mateo-county-libraries/id1371647186)

Access library services from your mobile device. Manage your account, search the catalog, place holds, and use your digital library card. Discover events and access a wide range of digital resources like eBooks and eAudiobooks.

**Highlights:** Account management, Catalog search, Place holds, Digital library card, Event discovery, Digital collection access

**Features:** Vision Pro support

**In-app purchases:** none


### EYEnstein

[App page](https://appshunter.io/ios/app/eyenstein/id6443454220)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is San Mateo County Libraries free?

San Mateo County Libraries is free to download, with no in-app purchases.

### Is EYEnstein free?

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

### Do San Mateo County Libraries or EYEnstein have ads?

Neither San Mateo County Libraries nor EYEnstein shows ads.

### Which is updated more often, San Mateo County Libraries or EYEnstein?

San Mateo County Libraries ships an update every 2 months, and EYEnstein monthly. Most recently, San Mateo County Libraries was updated on October 24, 2026 and EYEnstein 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.*