Blue Def Decoder

Name: Blue Def Decoder
Price: 2.99 USD
Rating: 2.6 (5 reviews)
Author: Mako Technology Labs

Check DEF freshness instantly

Only for iPhone

$2.99 · Designed for iPhone. Not verified for macOS.

5 Ratings
Age Rating

4+
Years
Category

Utilities
Developer

Mako Technology Labs
Language

EN
English
Size

20.4
MB

iPhone

Decode DEF codes in seconds Easily check the freshness of your Diesel Exhaust Fluid (DEF) with Blue Def Decoder. Enter the 5–11 character code printed on your DEF container — whether it’s the short date section or the full code — and instantly see the manufacturing date and freshness status. Use Blue Def Decoder to: Confirm your DEF hasn’t expired Track shelf life for storage Verify compliance for your vehicle Blue Def Decoder saves you time and removes the guesswork from DEF code verification. Perfect for Sprinter van owners, diesel truck drivers, and anyone who needs quick, accurate results.

Ratings & Reviews

2.6

out of 5

5 Ratings

Does not work. Scam
Feb 21

Spjlj1
Needs to be updated

Developer Response
Hi! It was not intended to be a scam. What doesn’t work about it? We are working to implement the new code structure. We will hopefully have a new release within a week.UPDATE. The app now is capable of all variations of the codes.
Does not work. Scam
Feb 21

Spjlj1

Needs to be updated
Developer Response Mar 29
Hi! It was not intended to be a scam. What doesn’t work about it? We are working to implement the new code structure. We will hopefully have a new release within a week.UPDATE. The app now is capable of all variations of the codes.
Save the day
Feb 26

Rover7777
I went into one of the big box retailers to buy some DEF and used the app to find out everything was from 2019. The typical shelf life is two years and I am so glad I did not buy this and put it in my Mercedes and any potential problems that would’ve occurred.
Save the day
Feb 26

Rover7777

I went into one of the big box retailers to buy some DEF and used the app to find out everything was from 2019. The typical shelf life is two years and I am so glad I did not buy this and put it in my Mercedes and any potential problems that would’ve occurred.
NEEDS TO BE UPDATED NOW! PLEASE!!!
Feb 10

wetdawg
i just downloaded this app and it DOES NOT REFLECT NEW BOX CODING blue def has switched to. the new codes no longer include letters for the plant that manufactures the batch. this app immediately rejects what is entered when the code is all numbers. Please update this app so it reflects the new code naming convention… feels like i got ripped off… unable to email developer… seems like a great opportunity for someone to make a relevant app that is sorely needed. PLEASE UPDATE!

Developer Response
My apologies we didn’t see this message. We will work to get a new release out as soon as we can with the new codes.UPDATE. The new version should take all codes into consideration.
NEEDS TO BE UPDATED NOW! PLEASE!!!
Feb 10

wetdawg

i just downloaded this app and it DOES NOT REFLECT NEW BOX CODING blue def has switched to. the new codes no longer include letters for the plant that manufactures the batch. this app immediately rejects what is entered when the code is all numbers. Please update this app so it reflects the new code naming convention… feels like i got ripped off… unable to email developer… seems like a great opportunity for someone to make a relevant app that is sorely needed. PLEASE UPDATE!
Developer Response Mar 29
My apologies we didn’t see this message. We will work to get a new release out as soon as we can with the new codes.UPDATE. The new version should take all codes into consideration.
Helpful App
09/06/2025

Woodley van life.
This app is simple for anyone wanting to easily determine the age of Blue DEF fluid before purchasing. All you need to do is enter a portion of the code on the box and the app tells you the manufacture date and age of the fluid. The app is very helpful as I would always forget how to read the code. Being able to adjust the age dates is a plus as well.
Helpful App
09/06/2025

Woodley van life.

This app is simple for anyone wanting to easily determine the age of Blue DEF fluid before purchasing. All you need to do is enter a portion of the code on the box and the app tells you the manufacture date and age of the fluid. The app is very helpful as I would always forget how to read the code. Being able to adjust the age dates is a plus as well.

Version 1.1 BlueDEF recently changed their batch code format to an all-numeric system (e.g. 2033/26/016/7816). This update adds full support for the new codes while keeping backward compatibility with the old format.

Version 1.1 Mar 29

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

Information

Seller: Mako Technology Labs LLC
Size: 20.4 MB
Category: Utilities
Compatibility: Requires iOS 15.1 or later.

iPhone
Requires iOS 15.1 or later.

iPod touch
Requires iOS 15.1 or later.

Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 1.0 or later.
Languages: English
Age Rating: 4+

4+

Learn More