# DAIG Bookshelf vs World Postal Zip Codes ePost

The clearest difference is review sentiment: World Postal Zip Codes ePost at 100% against DAIG Bookshelf's 25%. World Postal Zip Codes ePost also leads on rating (4.4 vs 3.3). DAIG Bookshelf's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. World Postal Zip Codes ePost sells 1 one-off in-app purchase. DAIG Bookshelf asks for nothing beyond the download.

World Postal Zip Codes ePost holds the better App Store score, 4.4 against 3.3. Both are backed by a comparable volume of ratings — 7 and 10 respectively. Written reviews point the same way: 25% of DAIG Bookshelf's written reviews are positive against 100% of World Postal Zip Codes ePost's.

DAIG Bookshelf ships an update every 5 weeks, World Postal Zip Codes ePost every 3 months. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | DAIG Bookshelf | World Postal Zip Codes ePost |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (7 ratings)](https://appshunter.io/ios/app/daig-bookshelf/id1147298600/reviews) | **[4.4 (10 ratings)](https://appshunter.io/ios/app/world-postal-zip-codes-epost/id1174159518/reviews)** |
| Number of ratings | 7 | **10** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 402 MB | 221 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TRADOC Mobile](https://appshunter.io/developer/960437358) | [Eyermin Colon Sanchez](https://appshunter.io/developer/1123699337) |

## What reviewers say

### DAIG Bookshelf

[App page](https://appshunter.io/ios/app/daig-bookshelf/id1147298600)

Access a local library of commonly used, publicly available Army Inspector General publications. This app is designed for offline use, saving you time and providing essential documents when disconnected.

**Highlights:** Local copy of publications, Publicly available IG documents, Time-saving access, Disconnected use, Reference material

**Features:** macOS Compatibility

**In-app purchases:** none


### World Postal Zip Codes ePost

[App page](https://appshunter.io/ios/app/world-postal-zip-codes-epost/id1174159518)

Access a comprehensive global database of postal codes with quick search and interactive map features. Ideal for travelers, logistics professionals, and developers needing accurate address information for over 190 countries. Supports offline viewing and advanced filtering.

**Highlights:** Global postal code database, Quick search by city, address, or coordinates, Interactive map view, Offline access to saved codes, Advanced filtering options, Detailed country and region data

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version postal codes | $3.99 | one-time |


## Frequently asked questions

### Is DAIG Bookshelf free?

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

### Is World Postal Zip Codes ePost free?

World Postal Zip Codes ePost is free to download, with in-app purchases available.

### Which has better reviews, DAIG Bookshelf or World Postal Zip Codes ePost?

World Postal Zip Codes ePost is rated higher. DAIG Bookshelf averages 3.3 out of 5 from 7 ratings, while World Postal Zip Codes ePost averages 4.4 from 10 ratings.

### Do DAIG Bookshelf or World Postal Zip Codes ePost have ads?

World Postal Zip Codes ePost shows ads; DAIG Bookshelf does not.

### Which is updated more often, DAIG Bookshelf or World Postal Zip Codes ePost?

DAIG Bookshelf ships an update every 5 weeks, and World Postal Zip Codes ePost every 3 months. Most recently, DAIG Bookshelf was updated on October 24, 2026 and World Postal Zip Codes ePost on October 29, 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.*