# A.I.M. vs GSA Per Diem

The clearest difference is rating: GSA Per Diem at 5.0 against A.I.M.'s 3.7. A.I.M.'s advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume, 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.

GSA Per Diem holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

A.I.M. ships an update fortnightly, GSA Per Diem monthly. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | A.I.M. | GSA Per Diem |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (3 ratings)](https://appshunter.io/ios/app/aim/id1608340879/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/gsa-per-diem/id6779188397/reviews)** |
| Number of ratings | **3** | 2 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Monthly |
| Monetization | **Free** | Ad-supported |
| Size | 34 MB | 48 MB |
| Requires iOS | **12.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Audubon Engineering Operations, LLC](https://appshunter.io/developer/1604627479) | [Kiarash Torkian](https://appshunter.io/developer/6771679909) |

## What reviewers say

### A.I.M.

[App page](https://appshunter.io/ios/app/aim/id1608340879)

This application is designed for engineers and authorized personnel within Audubon. It provides access to specific tools and information relevant to their professional roles.

**Highlights:** Engineering tools, Authorized user access, Professional role information, Audubon specific features

**Features:** macOS Compatibility

**In-app purchases:** none


### GSA Per Diem

[App page](https://appshunter.io/ios/app/gsa-per-diem/id6779188397)

This app helps federal travelers plan trips and calculate per diem expenses. It provides up-to-date lodging and meal rates for various US destinations and allows for the generation of detailed trip expense reports. Export your findings as PDFs or CSV files for easy sharing and record-keeping.

**Highlights:** Per diem rate lookup by location and fiscal year, Calculate lodging, meals, and incidental expenses, Generate trip expense reports, Export reports to PDF and CSV, Handles cross-fiscal year travel, Excludes lodging on final travel day

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

**In-app purchases:** none


## Frequently asked questions

### Is A.I.M. free?

A.I.M. is free to download, with no in-app purchases.

### Is GSA Per Diem free?

GSA Per Diem is free to download, with no in-app purchases.

### Which has better reviews, A.I.M. or GSA Per Diem?

GSA Per Diem is rated higher. A.I.M. averages 3.7 out of 5 from 3 ratings, while GSA Per Diem averages 5.0 from 2 ratings.

### Do A.I.M. or GSA Per Diem have ads?

GSA Per Diem shows ads; A.I.M. does not.

### Which is updated more often, A.I.M. or GSA Per Diem?

A.I.M. ships an update fortnightly, and GSA Per Diem monthly. Most recently, A.I.M. was updated on October 12, 2026 and GSA Per Diem on October 25, 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.*