Comparison

AX vs Author BT Update

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

AX

Enhance your car's audio system with this digital signal processor. It offers an all-in-one solution for various audio setups, allowing for improved sound quality and subwoofer integration while preserving factory features. Control settings easily via a smartphone app.

Highlights
  • Digital Signal Processor
  • Subwoofer integration
  • Preserves OE features
  • Bluetooth smartphone control
  • Vehicle-specific T-Harnesses (sold separately)
  • All-in-one solution
Features
Read full description

Axxess, a leader in vehicle interfacing, has once again set the industry standard by developing a cost effective option for customers desiring to improve vehicle sound quality with a Digital Signal Processor. The AX-DSP-XL presents an all-in-one solution for a variety of car audio system setups, from fixed level output (digital) to analog OE systems, and even adding a subwoofer to an OE system. Our before the amp solution is designed to allow the installers the option to remove the factory amplifier or to add a subwoofer all while maintaining the OE features and controls of the radio. Whether you have a Digital or Analog factory amplifier system, the AX-DSP-XL has you covered. Unlike other digital signal processors on the market, the AX-DSP-XL includes a built-in Axxess Interface. More reasons installers will love the new Axxess DSP is for its quick and simple installation behind the factory radio, due to its small footprint. Features and settings are easily controlled via Bluetooth from our free Smartphone application. To further cut down on install time, Axxess has engineered vehicle specific T-Harnesses (sold separately), that make installation even faster and easier, with no need to cut any wires. The Axxess Digital Signal Processor provides a smart and cost efficient way to provide improved sound quality that customers want when upgrading their vehicle sound systems.

About

Author BT Update

Features
Read full description

The Author-Alarm Firmware Update Utility is a powerful tool designed to facilitate the seamless updating of firmware for Author-Alarm devices. Secure Firmware Downloads: Firmware updates are sourced securely from Author-Alarm servers, guaranteeing the authenticity and integrity of the files. This safeguards against potential security threats and ensures a reliable update process. User-Friendly Interface: The utility boasts an intuitive and user-friendly interface, making it accessible to both novice and experienced users. Clear navigation and instructions guide users through the firmware update process. Device Compatibility: The utility is engineered to support a variety of Author-Alarm devices, including but not limited to alarm systems, immobilizers, and tracking units.

Screenshots

AX3 screens
Author BT Update3 screens

Verdict

The call

The clearest difference is update cadence: Author BT Update at monthly against AX's every 2 months. AX's advantage is device support (3 vs 1) and iOS requirement (12.1 vs 16.0). On price, ads and in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

AX ships an update every 2 months, Author BT Update monthly. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

Scorecard3 real differences · 7 level
AX versus Author BT Update: the parameters behind the verdict, then further details
ParameterAXAuthor BT Update
PriceFreeFree
Rating2.2 (5 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings5 — better—
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.1 — better16.0
Further details — not scored
Size10 MB4 MB
Age rating4+4+
DeveloperMetra Electronics Corp.AUTHOR-ALARM

In-app purchases

None

AX

No in-app purchases

None

Author BT Update

No in-app purchases

Questions

Is AX free?
AX is free to download, with no in-app purchases.
Is Author BT Update free?
Author BT Update is free to download, with no in-app purchases.
Do AX or Author BT Update have ads?
Neither AX nor Author BT Update shows ads.
Which is updated more often, AX or Author BT Update?
AX ships an update every 2 months, and Author BT Update monthly. Most recently, AX was updated on October 3, 2026 and Author BT Update on October 10, 2026.

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