# Piping Engineer's Toolbox vs OBDThink

The clearest difference is price: OBDThink at Free against Piping Engineer's Toolbox's $4.99. OBDThink also leads on update cadence (every 3 weeks vs every 21 months). Piping Engineer's Toolbox's advantage is in-app purchases (none vs 4) and iOS requirement (15.6 vs 17.6). On ads and device support there is nothing between them.

OBDThink is free to download; Piping Engineer's Toolbox costs $4.99 up front. OBDThink sells 4 in-app purchases, starting at $6.99 per 7 days. Piping Engineer's Toolbox asks for nothing beyond the download.

Piping Engineer's Toolbox ships an update every 21 months, OBDThink every 3 weeks. The most recent releases landed on September 19, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Piping Engineer's Toolbox | OBDThink |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 weeks** |
| Size | 57 MB | 43 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) | [TOPRAK TEKIN](https://appshunter.io/developer/1849139351) |

## What reviewers say

### Piping Engineer's Toolbox

[App page](https://appshunter.io/ios/app/piping-engineers-toolbox/id6738736451)

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

**In-app purchases:** none


### OBDThink

[App page](https://appshunter.io/ios/app/obdthink/id6754601889)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OBDThink Tam Sürüm Haftalık paket | $6.99 | per 7 days |
| OBDThink Tam Sürüm Aylık paket | $12.99 | per month |
| OBDThink Tam Sürüm Yıllık paket | $44.99 | per year |
| OBDThink Tam Sürüm | $79.99 | one-time |


## Frequently asked questions

### Is Piping Engineer's Toolbox free?

Piping Engineer's Toolbox costs $4.99, with no in-app purchases.

### Is OBDThink free?

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

### Do Piping Engineer's Toolbox or OBDThink have ads?

Neither Piping Engineer's Toolbox nor OBDThink shows ads.

### Which is updated more often, Piping Engineer's Toolbox or OBDThink?

Piping Engineer's Toolbox ships an update every 21 months, and OBDThink every 3 weeks. Most recently, Piping Engineer's Toolbox was updated on September 19, 2026 and OBDThink on September 8, 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.*