# Carista OBD2 vs GEM

The clearest difference is in-app purchases: GEM at none against Carista OBD2's 14. GEM also leads on ads (none vs shown) and iOS requirement (11.0 vs 16.4). Carista OBD2's advantage is chart position (#185 vs unranked). On price, update cadence and device support there is nothing between them.

Both are free to download. Carista OBD2 sells 6 in-app purchases, starting at $19.99 per month. GEM asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 1, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Carista OBD2 | GEM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (4.1K ratings)](https://appshunter.io/ios/app/carista-obd2/id954363569/reviews)** | — |
| Number of ratings | **4.1K** | — |
| Positive reviews | 34.2% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#185** | — |
| Size | 132 MB | 72 MB |
| Requires iOS | 16.4 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Prizmos](https://appshunter.io/developer/954363568) | [VASSAR LABS INC](https://appshunter.io/developer/1495797102) |

## What reviewers say

### Carista OBD2

[App page](https://appshunter.io/ios/app/carista-obd2/id954363569)

**Currently charting:** #185 Top Grossing · Utilities (US App Store)

This app acts as a DIY car mechanic, allowing you to customize features, diagnose warning lights, monitor live data, and perform maintenance. Save time and money by handling common car tasks yourself.

**Highlights:** Customize car behavior and unlock hidden features, Diagnose and reset dashboard warning lights, Monitor real-time vehicle parameters, Perform simple DIY car maintenance procedures, Access advanced electronic diagnostics

**Features:** Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic | $19.99 | per month |
| Pro | $19.99 | per month |
| 1 month Pro | $19.99 | per month |
| 3 month Pro | $29.99 | per 3 months |
| Pro | $59.99 | per year |
| One-Time Diagnostic & Reset | $9.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Customization options
- 🚀 Efficient diagnostics
- 💡 Helpful for maintenance
- 👍 Great customer support

**What reviewers complain about**

- 💰 Expensive subscription
- 🔒 Requires account login
- 🐛 Connectivity issues
- 🔒 Locked features behind paywall
- 🐛 Unreliable functionality

**Reported bugs**

- App crashes and freezes
- Subscription issues and billing problems
- Incompatibility with certain OBD2 adapters
- Customization features not working as expected
- Inaccurate fault code detection

**Requested features**

- Support for more vehicle makes and models
- Offline diagnostics and customization
- Ability to save customization settings
- More detailed error code information
- Improved user interface and navigation


### GEM

[App page](https://appshunter.io/ios/app/gem-pradan/id1617547310)

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

**In-app purchases:** none


## Frequently asked questions

### Is Carista OBD2 free?

Carista OBD2 is free to download, with in-app purchases available.

### Is GEM free?

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

### Do Carista OBD2 or GEM have ads?

Carista OBD2 shows ads; GEM does not.

### Which is updated more often, Carista OBD2 or GEM?

Carista OBD2 ships an update every 3 weeks, and GEM every 3 weeks. Most recently, Carista OBD2 was updated on October 1, 2026 and GEM on September 13, 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.*