Reviewed: Gyraline G1 - 1-Year Later

In 2024, we stumbled upon a social media ad for an intriguing new device - The Gyraline DIY (now called the Gyraline G1), a combination of a 3D printed jig and mobile app that promised to turn your iPhone or Android phone into a precision device for DIY alignments. It came in several price tiers, the most affordable of which was a $40 US starter option, which paid for one 3D printed Gyraline frame and a pay-per-use subscription for the app so you could quickly check your toe, camber, and caster at home for just $1 per hour of use.

Being a setup-focused racer with a background in software and mobile app development, yours truly found the concept fascinating. While the low cost of entry and the pay-as-you-go price was a big part of the appeal, we wanted to do a thorough test. So, we opted for the top-shelf option available at the time - the Gyraline frame with a lifetime license for all functions of the app, all for the tantalizingly off-kilter charm price of $139.98 US.

Initial tests with our iPhone 13 showed promise. The UI was a little raw, and the device was sensitive to bumping and jostling, but - generally speaking - it worked. We tested it on three cars, compared the results to our tried-and-tested B-G Racing string alignment rack and found that you could get 4-wheel toe measurements that were within 0.2 degrees if you took a few measurements and averaged them out.

We ran a number of tests on a few more cars and sent a long list of feedback and suggestions to Gyraline's support email and continued to try the Gyraline on various cars, both in the shop and at the track. The plan at the time was to continue testing the device and write a long-term review in which we tested the devices in real-world situations at various racetracks during the 2025 season.

Fast forward 14 months to today, and our Gyraline G1 is sitting on a shelf, collecting dust. We never got as far as the article, as we had stopped using it entirely by the 5-month mark.

So... what happened?

At the time, we were banking on the accuracy and user-friendliness of the app changing for the better as time went on. And while the app did change, it didn't change in the ways that we had hoped or expected.

The first thing that changed was the pricing.

Within weeks of us receiving our Gyraline device, the entry level "pay-as-you-go" option disappeared, leaving the lifetime license (which had increased to $159.98) as only option. This immediately posed a problem for the value of the tool. The Gyraline DIY was a great deal for the average car enthusiast at its launch price of $39.98 + $1 per hour of use. But at almost $160 US, you could easily buy a set of toe plates from a tried and trusted manufacturer along with a digital camber gauge that would be both faster and easier to use than the one in the Gyraline app.

Then, came a series of app-breaking software updates.

A few months later, the user interface changed into something that was clunkier and harder to use, with certain options (like measuring front toe angles in the more accurate Body Align mode) no longer working the way that they had before.

At one point, we tried to do a quick check on a car that had been recently aligned, and the Gyraline G1 displayed readings that were wildly different from what we had expected from the previous spec sheet. A bit of research revealed that the app had auto-updated to a version with a known bug that affected the accuracy of measurements, and updating to the next version would correct the issue. Fortunately, we were at the shop where we had a strong internet connection and were able to update the app there and then.

Shortly after, the company abandoned development of the Android app, citing inconsistencies in the onboard IMUs (a combination of the accelerometer, gyroscope, and magnetometer) that come with some Android devices. This decision was understandable, as the sensors on different Android devices do come one of from several different vendors, and some Android phones lack a hardware sensor hub (the microprocessor array that ties the key sensors together) entirely. So the fact that they got rid of this option was not a big surprise.

What was a surprise was that we found that the app had issues with certain models of iPhone. Our iPhone 15 Pro gave us erratic measurements in Thrust Align mode and couldn't even produce a Surface Profile that was consistent enough to use Body Align mode.

We soon realized that we couldn't, in good conscience, recommend an alignment device that would produce inconsistent results for an average car enthusiast.

By the time our 2025 race season was underway, our Gyraline G1 and our iPhone 13 had found a permanent home on the bookshelf in our office.

The Re-Test - 1 Year Later

Despite this, social media ads wouldn't let us forget about our unused Gyraline G1. Yours truly started to see an average of two Gyraline ads per day on Facebook, just from catching up with posts and responding to messages from friends and fans. Most of them were for the new Gyraline G2 model, which now had a sturdier case and an external sensor pack that promised higher consistency and compatibility with Android devices.

Then, out of the blue, an innocent-looking post popped up on the Professional Awesome Racing Technical Group asking if anyone had any firsthand experience with the Gyraline.

That got us wondering - Had the Gyraline G1 improved at all in the past year?

We had to put it to the test.

Fortunately for us, the ProjectCRX Honda CRX Si happened to be in our shop, having just been corner weighted and aligned in preparation for a dyno tuning session. All we had to do was air up all four tyres to 30 psi, ensure that the wheel was straight ahead, and roll it onto the measurement pads that we have pre-marked for alignments and corner weighting.

Based on our electronic records, we knew that ProjectCRX had the following alignment, as measured on our B-G string rack and verified with our Longacre Quickset arms:

Front Total Toe: 0.15 deg in

Rear Total Toe: 0.15 deg in

Thrust Angle: +0.1 deg (rear wheels pointed to the driver's right)

The question was: How close could our Gyraline G1, using the latest version of the app, get to these figures?

In preparation, the author re-watched the latest instructional videos and re-read the manual (which still as of time of testing had a last update date of March 2025) to make sure that we were following the instructions to the T.

We then measured the toe on all four wheels, using the new Thrust Angle measurement mode (which replaced the old Body Align mode) to record the rear toe and thrust angle, then switching to the Align Toe mode to get toe measurements on all four wheels.

The Results

The results speak for themselves. And unfortunately, they are not good.

The Thrust angle measurements came within 0.05 degrees of the reference measurements two out of three times. On one of the attempts, the Gyraline reported completely inaccurate measurements for both rear total toe and thrust angle:

The first of three rear thrust angle measurements

The second attempt at measuring thrust angle, with strangely inaccurate results

The third attempt at Thrust Angle, which agreed with the first

The results of the Surface Profile measurement, critical for an accurate Thrust Angle reading

The 6-Point Toe measurement was even more inconsistent. Not only did it give us wildly different figures every single time, not a single one result agreed with the total rear toe measurement that the Gyraline had given us in Thrust Angle mode:

The first attempt at measuring total toe, with wildly inaccurate results

The second attempt at measuring 4 wheel toe, which incorrectly indicated front toe-out

The third attempt at measuring toe, which was the worst so far

This was admittedly a shock. When we had tested the Gyraline G1 on the very same car in the same shop space in early 2025, we noted that it would be off by a few tenths of a degree, with an occasional outlier. It did not have the wild inconsistencies that we saw during this re-test.

We re-checked the toe on the car using our Longacre Quickset toe arms and our digital measuring tapes just in case the alignment had shifted somehow while it was in storage. As expected, the toe arms agreed with the measurements we had taken two months earlier.

A bit of searching online revealed that there was a bug in one of the recent versions of the Gyraline app that was throwing off measurements. While the version we were using was not the version reportedly affected by this bug, we force-updated the app to the latest version and tried again.

The following screenshots show the better of the two measurements that we got using the latest version of the Gyraline app:

Thrust angle measurement indicating incorrect total toe and thrust angle

The total toe figures incorrectly indicated toe-out on both axles

The Surface Profile measurement still read 100% on both sides

As you can see, updating the app made no difference to the accuracy of the measurements.

Our iPhone 13 was purchased as a test device for mobile app testing, had never been used outside of the office and the shop space, nor has it ever been dropped or jarred. But we tested all of the onboard sensors using the Sensor Kinetics iOS app to make sure that it had not suffered some sort of fluke sensor malfunction. As expected, all of the onboard sensors were healthy and working as expected.

As one final test, we took our iPhone 15 Pro, removed it from its case, loaded it onto the Gyraline, and tested it with the older but proven version 2.22.7 of the Gyraline app. As we had seen in our initial set of tests, our iPhone 15 Pro could not produce a Surface Profile scan that was accurate enough to use the Body Align mode, and as a result, the 4-wheel toe measurements came back looking dramatically skewed:

The fact that the front and rear total toe angles shown in Body Align mode came back within 0.05 degrees of the reference measurement might look promising, but when you compare them to the results of Thrust Align mode, you can see that this is the result of coincidence rather than precision.

Conclusion & Recommendations

Here's the reality: Alignment tools need to be consistent first, then accurate.

If you are aligning a street car or a weekend warrior track car, it does not matter that your homemade string alignment setup and bubble level camber gauge might be consistently 0.2 degrees off compared to the measurements from a Hunter Hawkeye Elite alignment rack. What does matter is that you can pull your alignment kit off the shelf at any time and that you can produce the same consistent results, each and every time that you use it.

At the time of writing, the Gyraline G1 fails this basic requirement.

Combine that with the fact that the Gyraline G1 is now $189.98 along with a recent change to a finicky login-based authentication system (from the reliable QR code activation system that it used to have), and it makes the Gyraline G1 impossible to recommend, even for experimentation purposes.

Instead, we recommend a set of toe plates with thrust angle measurement features (such as this Autosolo 3-in-1 toe plate set) and combine that with an affordable camber gauge or a digital angle like this one from Klein Tools. You will be able to get 4-wheel toe and camber measurements in the same amount of the time that it will take to check and re-check your measurements using a Gyraline G1. And you can trust that the results will be both consistent and repeatable.

With the money you'll save by going with the toe plates, you can even upgrade the measuring tapes for the Autosolo toe plates to a set with better ergonomics and a stronger retractor mechanism (as the tapes included with the Autosolo kit do feel a bit cheap compared to say, a pair of Tajima G-Series measuring tapes).

Now - What about the Gyraline G2?

If you take one look at Gyraline's current marketing campaign as well as the posts from the company on the Gyraline User Facebook Group, it is very clear that the founders are betting the future of the product line on the G2. The G2 is a new unit with a sturdier Delrin (or Aluminum) case and an external sensor unit. It claims to be compatible with both Android and iOS phones and claims up to 0.01 degrees of precision for the 3-sensor Elite model.

Those of us with experience with professional alignment tools and/or have worked with mobile IMU arrays will be immediately skeptical of that claim of 0.01 degrees of precision in this application. Rightfully so. The most accurate stationary laser alignment racks promise precision in the range of ±0.02 degrees, and IMU arrays built with commercially available parts can only reach that level of precision in theory. Even the Setup Wizzard, widely considered to be the gold standard for aligning GT and Prototype Cars, only promises a precision of ±0.5 mm (approximately ±0.06 degrees) for toe and ±0.1 degrees for camber. Gyraline's precision claims are both suspicious and unnecessary.

Moreover, at the new price of $499 US for the most affordable Delrin-frame 2-axis model and $739 US for the Aluminim-frame 3-Axis model, the Gyraline G2 is well in the price range of tried-and-tested portable alignment tools from the likes of Longacre, SPC, Smartstrings, and B-G Racing. Those prices are even encroaching into the territory of weld-it-yourself hub stand kits which are basically foolproof to use, even for novice mechanics and setup engineers.

Given this (and the fact that the G2 is currently listed as Out of Stock as of early February 2026), we strongly recommend that you consider proven alternatives. If you do decide to purchase a Gyraline G2, we recommend that you proceed with caution and periodically verify your measurements using other alignment tools.

In the meantime, see you at the track.

~R

Disclosure Section:

StudioVRM and Roger Maeda are not affiliated with Gyraline, B-G Racing, Longacre, SPC, Klein Tools, Tajima, Setup Wizzard, Smartstrings or any of the other vendors mentioned here. Any of the parts purchased and reviewed for this article have been purchased at full price from our team's car development budget and Roger's own pocket.

StudioVRM is an Amazon Associate, which means that we get a small amount of referral income if you buy a product using any Amazon links in the article. We would be very appreciative if you did just that. These reviews and tests are fairly expensive to conduct, and the affiliate income barely covers the cost of the coffee that the author is drinking as he writes this sentence.