Mount guidecomma 4 · 3X · 3

The best mounts for your comma.

Our favorite is the JanQuick Cross Glide Mag Mount. Below it, every mount worth buying, with real photos, prices, and what fits.

See our pick Which one for my device?
comma four sitting on the JanQuick Cross Glide Mag Mount
comma four on the JanQuick Cross Glide Mag Mount. Photo: JanQuick

Seven mounts, in order

Every mount worth buying

  1. The magnetic windshield base with four magnets and a small board connector

    Our pick · JanQuick

    JanQuick Cross Glide Mag Mount

    Snap the device on and pull it off one-handed. Power runs through the mount, so the cable stays on the glass.

    $99.99comma four kit · $89.99 comma 3 and 3X kit

    • comma 4
    • comma 3X
    • comma 3
    Buy at JanQuick
    Good to know
    • Magnetic hold you can tune by removing one or two magnets.
    • CNC-machined PEI and nylon body, 22 to 23 mm thick.
    • Kit: mount, short device cable, 1.6 ft USB-C cable, six 3M VHB pads, tools.
    • Ships from China with free shipping on orders over $30.
    • The comma 3 and 3X kit was sold out when we checked.
    comma 3X on the Cross Glide Mag Mount with the red tape pad visible
    The comma four device-side half of the Mag Mount with its short cable
  2. comma four on the aluminum JanQuick Cross Glide Mount Pro

    No. 2 · JanQuick

    JanQuick Cross Glide Mount Pro

    The same quick release without magnets: a thin aluminum slide with a safety latch, half the height of the Mag Mount.

    $79.99comma four kit · $69.99 comma 3 and 3X kit

    • comma 4
    • comma 3X
    • comma 3
    Buy at JanQuick
    Good to know
    • CNC aluminum, bead-blasted and hard-anodized black, 11 mm thick.
    • Power and data pass through the mount, like the Mag Mount.
    • A $6.99 adapter fits it onto comma's factory mount, so nothing is peeled off.
    • An extra windshield base for a second car costs $39.99.
  3. The two halves of the BearTech Side Slidemount for comma four

    No. 3 · BearTech Workshop

    BearTech Side Slidemount for comma four

    A magnet-free side slide with a CNC aluminum bracket, shaped so the comma four's cooling fan stays clear.

    CA$69complete set, Canadian dollars

    • comma 4
    • comma 3X
    • comma 3
    Buy at BearTech
    Good to know
    • Press to unlock, and it slides on from the left or the right.
    • No angle wedge needed, even on steep windshields, says BearTech.
    • Power passes through the mount with the two included cables.
    • Assembled in Vancouver. A CA$48 DIY kit lets you print the housing yourself.
  4. The windshield half of the BearTech Slidemount with its red tape pad

    No. 4 · BearTech Workshop

    BearTech Slidemount for comma 3 and 3X

    A short vertical slide with magnets that guide the device into place, printed in heat-resistant ASA-CF.

    CA$52complete set, Canadian dollars

    • comma 4
    • comma 3X
    • comma 3
    Buy at BearTech
    Good to know
    • Needs about 3.5 cm of space to one side to slide off.
    • Add the 8 degree wedge on Highlander, Pilot, F-150, Maverick, and Rivian windshields.
    • Power passes through a blade connector between the halves.
    • Includes a cover for the windshield half so the contacts stay clean.
  5. Two official comma four mounts with their tape backing

    No. 5 · comma

    comma's own mount

    The bracket in the box: light, low, and free. Every removal means unplugging the cable, though.

    Includedtwo ship with comma four · replacements $20 for two

    • comma 4
    • comma 3X
    • comma 3
    Replacement mounts at comma
    Good to know
    • comma 3X replacement mount $15, or $15 for the 8 degree version for steep windshields.
    • Sticks with 3M tape. Press the center first, then the edges.
    • comma four mounts do not fit a comma 3X or comma three.
    • The mount files are open source on GitHub if you want to print one.
  6. The device half of the BearTech Magmount V2 with its steel plate

    No. 6 · BearTech Workshop

    BearTech Magmount V2

    The magnetic favorite for comma 3 and 3X, with 24 gold pins carrying power. Complete sets are sold out right now.

    CA$140complete set when in stock · parts only today

    • comma 4
    • comma 3X
    • comma 3
    See it at BearTech
    Good to know
    • 17 mm thick. A steel shield cuts the magnetic field near the 3X fan.
    • Tested for a week at 85 °C and through 10,000 attach cycles, says BearTech.
    • No comma four version yet. BearTech says a new design waits on the device.
  7. comma four on a printed quick disconnect mount held up outdoors

    No. 7 · Community files

    Print your own

    Free files for a comma four quick disconnect with USB-C, and docks for the 3X, if you have a printer.

    Free filesplus a right-angle USB-C connector and tape

    • comma 4
    • comma 3X
    • comma 3
    Get the files
    Good to know
    • comma four quick disconnect by James Mikesell on MakerWorld, CC BY-NC-SA.
    • comma 3X Quick Dock by Scpowered on MakerWorld, for standard and 8 degree mounts.
    • Print in ASA or nylon. PLA melts in a parked car.
    • comma's own mount files are on GitHub too.
Four more options
  • BluePilot sliding dockOrder form comma four only now, $64 or $108 with the Lightning coupler. Experimental; read the disclaimer first.
  • BearTech Suction RackBearTech CA$60. Suction cups instead of tape, with a bubble level. Needs a Slidemount or Magmount on top.
  • JanQuick Rivian kitJanQuick $99.99 to $149.99. The Mount Pro with an 8 degree adapter and a cable hub for Rivian trucks.
  • Custom comma 3 and 3X mountPrintables Free, public domain. A reworked copy of comma's mount that slides in more easily.

Which one?

Pick by device

  • comma 4

    JanQuick Cross Glide Mag MountOr the BearTech Side Slidemount for less, or comma's mount if you rarely take it down.

    See it

  • comma 3X

    JanQuick Cross Glide Mount ProThe Mag Mount kit for the 3X was sold out when we checked. BearTech Slidemount is the value pick.

    See it

  • comma 3

    Same mounts as the 3XThe comma 3 and 3X share every mount on this page. Check the fit chips.

    See it

Before you stick it on

Mount it well

  • High, centered, below the trimCenter it on the glass with room to remove the trim and see the screen.
  • Clean the glass firstUse the alcohol wipe and let it dry. Then press the center, then the edges.
  • Steep windshield? Add 8 degreesIf the glass tilts the device over 5 degrees, use an 8 degree mount or wedge.
  • Printing one? Skip PLAUse ASA, nylon, or PETG. PLA softens in a hot parked car.
comma 3X on its mount high on the windshield, seen from the driver's seat
comma 3X on the official mount. Photo: comma.ai

Next steps

Install the device, compare the hardware, or start from the beginner guide.

Install your deviceAll accessoriesCompare devices

Photos: JanQuick, BearTech Workshop, comma.ai, and James Mikesell. Prices seen September 10, 2026: JanQuick in US dollars, BearTech in Canadian dollars. Product names belong to their makers. CommaGuide is an independent guide.

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