Various

Classic-Bluetooth ELM327 adapters

The cheapest OBD-II adapters. Android can use them; iPhone can’t.

Many low-cost adapters use Classic Bluetooth serial rather than Bluetooth LE. iOS doesn’t allow apps to use that, but Android does, so these adapters are planned for the TRACK Android app.

01What it adds to TRACK

What it adds to TRACK

  • 01

    Use the adapter you already have

    If you own a basic Bluetooth OBD-II adapter, the Android app is planned to support it.

  • 02

    Same engine data

    RPM, temperatures, voltage and more where your car reports them, through TRACK’s tested OBD engine.

02Getting it

How it connects

  1. 1Not available yet. Planned for the TRACK Android app.

03Specs that matter to TRACK

Connection
Bluetooth Classic (serial)
What TRACK reads
RPM, speed, coolant and intake temperature, throttle plate, battery voltage, and fuel level or oil temperature where your car reports them
Writes to the car
Never

04iPhone & Android

iPhone and Android

iPhone appNot compatible

Not possible: iOS doesn’t let apps use Bluetooth serial.

Android appCompatible

Android app planned. Android apps can use Bluetooth serial, so these adapters can work there.

The TRACK iPhone app is in beta. The Android app is planned.

05Where it stands

Tested, pending, and good to know.

Verified so far
  • TRACK’s OBD engine is tested against an adapter emulator.
Still to do
  • The Android app isn’t built yet.
Good to know
  • OBD-II reports engine data slowly, roughly 3–6 readings per second per channel over Bluetooth LE. Great for temperatures and RPM trends, not for millisecond analysis.
  • The OBD “throttle position” is the ECU’s throttle-plate reading, not your pedal. TRACK labels it that way.
  • TRACK only reads data. It never writes to your ECU and never suggests tuning.
All devices

Prices are typical US retail, checked October 2026, and change often. TRACK doesn’t sell hardware. Product names describe compatibility only; no partnership or endorsement is implied.