# Door Data Systems vs Asprey Surveys

Door Data Systems and Asprey Surveys are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Door Data Systems ships an update every 2 months, Asprey Surveys monthly. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Door Data Systems | Asprey Surveys |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 40 MB | 39 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Door Data Systems](https://appshunter.io/developer/1530827741) | [Asprey Management Solutions Limited](https://appshunter.io/developer/1640082853) |

## What reviewers say

### Door Data Systems

[App page](https://appshunter.io/ios/app/door-data-systems/id1538987604)

**Features:** Vision Pro support

**In-app purchases:** none


### Asprey Surveys

[App page](https://appshunter.io/ios/app/asprey-surveys/id6770544908)

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

**In-app purchases:** none


## Frequently asked questions

### Is Door Data Systems free?

Door Data Systems is free to download, with no in-app purchases.

### Is Asprey Surveys free?

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

### Do Door Data Systems or Asprey Surveys have ads?

Neither Door Data Systems nor Asprey Surveys shows ads.

### Which is updated more often, Door Data Systems or Asprey Surveys?

Door Data Systems ships an update every 2 months, and Asprey Surveys monthly. Most recently, Door Data Systems was updated on October 27, 2026 and Asprey Surveys on October 28, 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.*