# Technical Pocket Guide (STT) vs OBD2 Codes | Repair Guide

The clearest difference is in-app purchases: Technical Pocket Guide (STT) at none against OBD2 Codes | Repair Guide's 1. Technical Pocket Guide (STT) also leads on ads (none vs shown). OBD2 Codes | Repair Guide's advantage is update cadence (fortnightly vs every 9 months) and iOS requirement (15.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. OBD2 Codes | Repair Guide sells 1 one-off in-app purchase. Technical Pocket Guide (STT) asks for nothing beyond the download.

Technical Pocket Guide (STT) ships an update every 9 months, OBD2 Codes | Repair Guide fortnightly. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Technical Pocket Guide (STT) | OBD2 Codes | Repair Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/technical-pocket-guide-stt/id426818450/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 55 MB | 65 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Schaeffler](https://appshunter.io/developer/426470435) | [sultan hamdi](https://appshunter.io/developer/6799153451) |

## What reviewers say

### Technical Pocket Guide (STT)

[App page](https://appshunter.io/ios/app/technical-pocket-guide-stt/id426818450)

This mobile reference guide offers essential technical knowledge for students, engineers, and technicians. It features a comprehensive search function, customizable bookmarks, and offline access, making it a convenient tool for daily work.

**Highlights:** Mobile technical reference, Full-text search, Table of contents with links, Customizable bookmarks and notes, Email content sharing, Offline functionality

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

**In-app purchases:** none


### OBD2 Codes | Repair Guide

[App page](https://appshunter.io/ios/app/obd2-codes-repair-guide/id6804091355)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $6.99 | one-time |


## Frequently asked questions

### Is Technical Pocket Guide (STT) free?

Technical Pocket Guide (STT) is free to download, with no in-app purchases.

### Is OBD2 Codes | Repair Guide free?

OBD2 Codes | Repair Guide is free to download, with in-app purchases available.

### Do Technical Pocket Guide (STT) or OBD2 Codes | Repair Guide have ads?

OBD2 Codes | Repair Guide shows ads; Technical Pocket Guide (STT) does not.

### Which is updated more often, Technical Pocket Guide (STT) or OBD2 Codes | Repair Guide?

Technical Pocket Guide (STT) ships an update every 9 months, and OBD2 Codes | Repair Guide fortnightly. Most recently, Technical Pocket Guide (STT) was updated on October 7, 2026 and OBD2 Codes | Repair Guide on October 11, 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.*