# NDTA Events vs Prooffd

The clearest difference is in-app purchases: NDTA Events at none against Prooffd's 2. NDTA Events also leads on iOS requirement (13.0 vs 18.0). Prooffd's advantage is update cadence (every 5 days vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Prooffd sells 2 in-app purchases, starting at $14.99 per month. NDTA Events asks for nothing beyond the download.

NDTA Events ships an update monthly, Prooffd every 5 days. The most recent releases landed on November 3, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | NDTA Events | Prooffd |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (321 ratings)](https://appshunter.io/ios/app/ndta-events/id6459050916/reviews)** | — |
| Number of ratings | **321** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Free | — |
| Size | 125 MB | 11 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [National Defense Transportation Association](https://appshunter.io/developer/1701600920) | [Joseph McGee](https://appshunter.io/developer/1869401513) |

## What reviewers say

### NDTA Events

[App page](https://appshunter.io/ios/app/ndta-events/id6459050916)

This app provides registered attendees with essential information and interactive features for National Defense Transportation Association (NDTA) co-sponsored events. It facilitates learning about the event, engaging with sessions and other attendees, and networking with professionals.

**Highlights:** Event information access, Personalized agenda builder, Live Q&A and polls, Event wall for photo sharing, Attendee QR code scanning, Direct messaging with attendees

**Features:** macOS Compatibility

**In-app purchases:** none


### Prooffd

[App page](https://appshunter.io/ios/app/prooffd/id6761090533)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Membership | $14.99 | per month |
| Prooffd Pro | $79.99 | per year |


## Frequently asked questions

### Is NDTA Events free?

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

### Is Prooffd free?

Prooffd is free to download, with in-app purchases available.

### Do NDTA Events or Prooffd have ads?

Neither NDTA Events nor Prooffd shows ads.

### Which is updated more often, NDTA Events or Prooffd?

NDTA Events ships an update monthly, and Prooffd every 5 days. Most recently, NDTA Events was updated on November 3, 2026 and Prooffd on November 9, 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.*