Five Bluetooth OBD2 adapters, one vehicle, one app build, same conditions — and the numbers we got.
Every buying guide tells you to "get a good adapter." Almost none of them publish what they measured. This is what we measured, how we measured it, and where the results are too close to call. No verdicts — the numbers are the point.
We don't sell adapters and we don't earn a commission on any of these. If that ever changes, it will say so on this page, in this spot.
All five on a 2015 F-150, engine idling, parked, one adapter in the port at a time, same phone in the same position, the same app build reading the same seven sensors. Our software is identical across every run, so the differences below are the hardware.
| Adapter | Android readings/sec | Time per pass | Dropped reads | iPhone |
|---|---|---|---|---|
| Veepeak | 0.75 | 1,329 ms | 0 of 120 | confirmed |
| FlyRoadUp | 0.71 | 1,412 ms | 0 of 60 | confirmed |
| Feronix | 0.54 | 1,845 ms | 5 of 60 | not retested |
| Torque Pro | 0.44 | 2,279 ms | 0 of 60 | not retested |
| Ebog | 0.41 | 2,460 ms | 0 of 60 | not retested |
The top two are within six percent of each other, measured on a single run each, and repeat captures of the same adapter have varied by more than that. On this evidence they are level.
The spread from top to bottom is about 1.8×, which is larger than the run-to-run variation and so is a real difference: a full pass takes roughly 1.35 seconds at the top of the table and 2.46 at the bottom. Whether that matters depends on what you are doing — for a steady reading it does not, for chasing something intermittent it might.
The "dropped reads" column counts sensors the vehicle supports that came back empty during the capture. Four of the five returned everything asked of them.
An adapter is either Bluetooth Classic or Bluetooth Low Energy (BLE). iOS will not talk to a Classic adapter without Apple-licensed hardware, so BLE is the thing to look for on the box — it is what makes an adapter usable with an iPhone at all.
We have confirmed two of these five on an iPhone: the Veepeak and the FlyRoadUp. The other three we have not retested since a recent fix to our own Bluetooth handling, so we are not reporting an iPhone result for them yet — an earlier attempt predates that fix and we would rather say nothing than say something we would have to take back.
iPhone speed numbers are not published yet either. Our earlier iOS measurements used a method that is not comparable to the table above, so we are re-running them properly rather than restate figures that would mislead.
"Full readings per second" is how often the app completes a whole pass of the sensors it watches — measured as the time between successive reads of the same sensor.
That distinction matters, and it caught us out. Our first version of this number divided by how many sensors happened to appear in a short window, which overstated every result and hid the effect of the occasional very slow reply. Two adapters looked identical under it and are 23 percent apart in reality. The numbers above use the corrected method.
Single runs on one vehicle. That is a sample, not a benchmark, and it's why the top two are presented as a tie. As we collect repeat runs and a second vehicle, this page changes.
Look for BLE. Past that, every adapter we measured completed the job, the whole field sits inside a 1.8× spread, and the quickest-responding one was not the most expensive. If you already own a working BLE adapter, our numbers give you no reason to replace it.
We publish what we measured, on the vehicle and build stated. We have not tested every adapter on the market, and an adapter missing from this page is one we have not tried — nothing more than that.