Diesel Decoder vs NAPA Filters
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Diesel Decoder
This tool connects via Bluetooth to heavy commercial vehicles to read and clear diagnostic trouble codes. It displays live data, allows bi-directional commands, and generates shareable reports through a cloud platform. Requires dedicated hardware for operation.
- Read/clear Diagnostic Trouble Codes (DTCs)
- View live data parameters
- Run bi-directional commands
- Generate local and cloud reports
- Share reports via Diesel Health Platform
- Requires Diesel Decoder hardware
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Diesel Decoder is a Bluetooth diagnostics tool for all Heavy Commercial Vehicles, it can be used for reading/clearing Diagnostic Trouble Codes (DTCs), parameters, live data, and running bi-directional commands using the Diesel Decoder hardware (required). Diesel Decoder also allows the user to generate local and cloud based reports that may be viewed, printed, or shared with others via the Diesel Laptops Diesel Health Platform.
NAPA Filters
Easily find the right filters for your vehicle using a "Search By Vehicle" tool or a dynamic search option. You can also look up NAPA part numbers or interchange OE and competitor part numbers.
- Search by vehicle year, make, model, and engine
- Dynamic search by typing vehicle description
- Search by NAPA part number
- Interchange OE or competitor part numbers
- View product information
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Choose the classic “Search By Vehicle” lookup to search by your vehicle’s year, make, model, and engine or switch to the updated “Dynamic Search”. With the dynamic search box, you can search for your vehicle by typing part or all your vehicle’s description and selecting from the suggestion list. You can also use the dynamic search box to enter a NAPA part number to get to the product information page or enter an OE or competitor part number to interchange it to a NAPA part.
Screenshots
Verdict
The clearest difference is rating: NAPA Filters at 5.0 against Diesel Decoder's 3.3. NAPA Filters also leads on in-app purchases (none vs 1) and update cadence (monthly vs every 3 months). Diesel Decoder's advantage is ratings volume (30 vs 2) and chart position (#165 vs unranked). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Diesel Decoder sells 1 in-app purchase, starting at $29.99 per month. NAPA Filters asks for nothing beyond the download.
NAPA Filters holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Diesel Decoder has 30 ratings behind it against 2, so its average is the more settled of the two.
Diesel Decoder ships an update every 3 months, NAPA Filters monthly. The most recent releases landed on September 22, 2026 and September 10, 2026 respectively.
| Parameter | Diesel Decoder | NAPA Filters |
|---|---|---|
| Price | Free | Free |
| Rating | 3.3 (30 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 27.3% of reviews | — |
| Number of ratings | 30 — better | 2 |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #165 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 43 MB | 67 MB |
| Age rating | 4+ | 17+ |
| Developer | Diesel Laptops LLC | Premium Guard Inc. |
Customer experience
Diesel Decoder
NAPA Filters
In-app purchases
Diesel Decoder
- Decoder Professional Monthly2 Months trial$29.991 Month
NAPA Filters
No in-app purchases
Questions
Is Diesel Decoder free?
Is NAPA Filters free?
Which has better reviews, Diesel Decoder or NAPA Filters?
Do Diesel Decoder or NAPA Filters have ads?
Which is updated more often, Diesel Decoder or NAPA Filters?
Other comparisons
