# OPW Inspection Request vs DropTubeBuilder

The clearest difference is in-app purchases: OPW Inspection Request at none against DropTubeBuilder's 2. DropTubeBuilder's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. DropTubeBuilder sells 2 in-app purchases, starting at $4.99 per month. OPW Inspection Request asks for nothing beyond the download.

OPW Inspection Request ships an update every 2 months, DropTubeBuilder every 3 weeks. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | OPW Inspection Request | DropTubeBuilder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/droptubebuilder-fuel-tanks/id6740597739/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 53 MB | 2 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [City of Oakland](https://appshunter.io/developer/1316091488) | [Chris Thrasher](https://appshunter.io/developer/1790762521) |

## What reviewers say

### OPW Inspection Request

[App page](https://appshunter.io/ios/app/opw-inspection-request/id1533058043)

**Features:** Vision Pro support

**In-app purchases:** none


### DropTubeBuilder

[App page](https://appshunter.io/ios/app/droptubebuilder-fuel-tanks/id6740597739)

This tool simplifies fuel system measurements for technicians. It offers accurate drop tube calculations, supports precise fill levels, and provides a reference for dispenser error codes. Streamline your work and ensure regulatory compliance in the field.

**Highlights:** Accurate drop tube length calculations, 95% fill level support, Tank volume chart builder, Dispenser error code reference, User-friendly field interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DropTubeBuilder Pro monthly | $4.99 | per month |
| DropTube Pro Annual | $24.99 | per year |


## Frequently asked questions

### Is OPW Inspection Request free?

OPW Inspection Request is free to download, with no in-app purchases.

### Is DropTubeBuilder free?

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

### Do OPW Inspection Request or DropTubeBuilder have ads?

Neither OPW Inspection Request nor DropTubeBuilder shows ads.

### Which is updated more often, OPW Inspection Request or DropTubeBuilder?

OPW Inspection Request ships an update every 2 months, and DropTubeBuilder every 3 weeks. Most recently, OPW Inspection Request was updated on November 11, 2026 and DropTubeBuilder on November 4, 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.*