# SDPROG vs ChkOBD OBD2 Analyzer

The clearest difference is rating: SDPROG at 5.0 against ChkOBD OBD2 Analyzer's 3.0. SDPROG also leads on in-app purchases (none vs 4) and update cadence (every 9 days vs every 3 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. ChkOBD OBD2 Analyzer sells 4 in-app purchases, starting at $4.99 per month. SDPROG asks for nothing beyond the download.

SDPROG holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 4 respectively.

SDPROG ships an update every 9 days, ChkOBD OBD2 Analyzer every 3 months. The most recent releases landed on October 2, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SDPROG | ChkOBD OBD2 Analyzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sdprog/id1020589879/reviews)** | [3.0 (4 ratings)](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011/reviews) |
| Number of ratings | 2 | **4** |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 85 MB | 63 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NexDiag Sp z o. o.](https://appshunter.io/developer/1316943345) | [Check On-Board Diagnostics LLC](https://appshunter.io/developer/1511585010) |

## What reviewers say

### SDPROG

[App page](https://appshunter.io/ios/app/sdprog/id1020589879)

This advanced diagnostic tool allows for comprehensive vehicle system analysis, including emission filters and real-time parameter monitoring. It supports cars, motorcycles, ATVs, hybrids, and electric vehicles, offering detailed insights into engine and onboard modules.

**Highlights:** Comprehensive OBD2 and service diagnostics, Advanced emission filter analysis (DPF, FAP, GPF, PEF), Real-time vehicle parameter monitoring, DTC reading and clearing, Support for cars, motorcycles, ATVs, hybrids, and EVs

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

**In-app purchases:** none


### ChkOBD OBD2 Analyzer

[App page](https://appshunter.io/ios/app/chkobd-obd2-analyzer/id1511585011)

Connect your iPhone or iPad to your car's engine to view vital data. Access basic engine values for free, with in-app purchases for advanced diagnostics, smog check readiness, VIN analysis, and error decoding.

**Highlights:** View engine values, In-app purchase for advanced data, Smog Check Assistant, VIN Analyzer, Error Decoder and Reset, Bluetooth adapter compatibility check

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Smog Check Assistant | $4.99 | per month |
| VIN Analyzer | $1.99 | one-time |
| Error Analyzer | $2.99 | one-time |
| Advance Engine Values | $4.99 | one-time |


## Frequently asked questions

### Is SDPROG free?

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

### Is ChkOBD OBD2 Analyzer free?

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

### Which has better reviews, SDPROG or ChkOBD OBD2 Analyzer?

SDPROG is rated higher. SDPROG averages 5.0 out of 5 from 2 ratings, while ChkOBD OBD2 Analyzer averages 3.0 from 4 ratings.

### Do SDPROG or ChkOBD OBD2 Analyzer have ads?

Neither SDPROG nor ChkOBD OBD2 Analyzer shows ads.

### Which is updated more often, SDPROG or ChkOBD OBD2 Analyzer?

SDPROG ships an update every 9 days, and ChkOBD OBD2 Analyzer every 3 months. Most recently, SDPROG was updated on October 2, 2026 and ChkOBD OBD2 Analyzer on October 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.*