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Crowd Supply
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SlimeVR
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Bio Sensing


SLIMEVR FULL-BODY TRACKER


AN AFFORDABLE, COMFORTABLE, WIRELESS, 360° SOLUTION FOR FULL-BODY TRACKING IN
VIRTUAL REALITY

$4,185,175 raised

of $180,000 goal

2,325% Funded! Order Below
27
updates
Oct 12 2021
funded on
15,739
backers

Available for pre-order.

$195 - $560

View Purchasing Options

RECENT UPDATES

 * Oct 15, 2024 The Biggest Shipment of Slimes Is on the Way!
 * Sep 20, 2024 Third Anniversary, and Even More Slimes Shipped!
 * Jun 07, 2024 A Big Shipment of Slimes Is On The Way!
 * Mar 25, 2024 More Slimes and The Future of VR

View all project updates
Subscribe
You'll be notified about news and stock updates for this project.

SlimeVR is a set of open hardware sensors and open source software that
facilitates full-body tracking (FBT) in virtual reality. With no base station
required, SlimeVR makes wireless VR FBT affordable and comfortable.


HOW DOES IT WORK?

SlimeVR FBT provides simple, effective tracking of your body and limbs in VR
games and other applications. it makes full-body tracking comfortable and
affordable by leveraging high-quality inertial measurement unit (IMU) sensors
and a Wi-Fi connection to your PC rather than wires, cameras, or base stations.
Taking the Lower-body set as an example, five trackers—one on each thigh,
another on each ankle, and a fifth at the chest—are enough to get the job done.
Each tracker monitors its own rotation in space, and SlimeVR software uses your
proportions and headset location to calculate joint angles and estimate limb
positions. In more technical terms, SlimeVR relies on absolute-orientation
sensors, a configurable skeleton model, and forward kinematics. The result is
like having virtual Vive trackers at key locations on your body.



The base set of five trackers is sufficient to cover lower-body movement (legs
and waist) and is widely supported by VR games and applications. VRChat, NeosVR
and LIV can use additional SlimeVR trackers to monitor the position and rotation
of your feet, knees, elbows, chest, and more!


OPTIMIZED FOR ACCESSIBILITY & COMFORT

Your comfort is our primary goal. SlimeVR trackers are lightweight, easy to
wear, and entirely self-contained. Because they do not depend on cameras or base
stations, they are able to track a wide range of motion without ever being
occluded, or blocked from view, in a way that would cause external sensors to
lose track of them.




COMPATIBLE WITH MANY DIFFERENT PLATFORMS

SlimeVR is broadly supported by popular VR software, including:

 * PC games and other applications, including VRChat, NeosVR, and Blade &
   Sorcery, to name just a few
 * VRChat on Quest 2 standalone with or without PC
 * Streaming VR applications with an avatar
 * VTubing direactly via OSC or Tracking World
 * SteamVR games
 * SteamVR games played using the Shadow platform

And much more as we grow!


WHAT ABOUT THE OCULUS (META) QUEST?

Support for Full-Body Tracking depends on the game and its developers.
Currently, only VRChat and VRWorkout support Full-Body Tracking with SlimeVR on
Oculus Quest without the need to run the game on a PC.

Full support of this is still in development, but thanks to the recent updates
from VRChat, where they introduced OSCTrackers, it’s now possible to use SlimeVR
fully standalone with VRChat! Here’s a guide from TheMysticle that shows the set
up process. Important note: We are still working on Android and Quest app for
SlimeVR, so for now it requires using a terminal emulator to run, but we plan to
solve it soon!




FEATURES & SPECIFICATIONS

 * Native SteamVR support
 * 100 Hz refresh rate
 * Completely wireless via 2.4 Ghz Wi-Fi
 * Over 15 hours of playtime with a built-in 1200 mAh battery
 * USB Type-C charging and hacking
 * Over-the-air (OTA) firmware updates
 * Works with all SteamVR-compatible headsets & Meta Quest 2
 * Does not require a PC with Wi-Fi support
 * Can connect to a Wi-Fi router on the same local network as your
   Ethernet-connected PC or directly to your PC if it does have Wi-Fi support
   (via the motherboard, a Wi-Fi card, or an external Wi-Fi dongle)




INTERFERENCE & DRIFT

SlimeVR is not affected by magnetic interference or positional drift, despite
its reliance on IMU sensors for tracking. Each tracker only monitors its own
rotation, which is enough for our software to estimate your pose. That means
your virtual legs will never do that thing where they suddenly fly away. (So
embarrassing…) SlimeVR is also unaffected by magnets or metal, as it does not
rely on a magnetometer. Over time, there is some horizontal-rotation (yaw)
drift, so body parts can end up facing the wrong direction after a while. We’ve
done a lot of work to compensate for this, however, and it typically takes
between 20 minutes and two hours, depending on your activity, for any drift to
become apparent. And if it does become apparent, don’t worry. Sensor
recalibration is incredibly user friendly. In order to fix any drift issues that
might arise, all you have to do is hold a straight pose while pressing a single
button.


COMPARISONS

SlimeVRViveTundraAprilTagAmethystHaritoraXmocopi Developer SlimeVR HTC Tundra
Ju1ce, DIY K2VR Team Shiftall Sony Form factor 5x 50 g trackers 3x 75 g trackers
3x 50 g trackers QR codes & central camera Central camera 5 trackers connected
by wires 6x 8g trackers Battery Life15 h 7.5 h 7 h ∞ ∞ 10 h 10 h Base stationNo
(Wi-Fi) SteamVR Lighthouse SteamVR Lighthouse Any camera Kinect No (Bluetooth)
No (Bluetooth) Prone to occlusionNo Yes Yes Yes Yes No No Coverage360° 360° 360°
360° ² 360° 360° 360° Precision1-10 cm ¹ < 1 mm < 1 mm < 1 cm 1-10 cm 1-10 cm ¹
1-20 cm Latency~15 ms ~15 ms ~15 ms 30+ ms ~20 ms >15 ms 50+ ms Update rate100
Hz 90-144 Hz 90-144 Hz Camera framerate 30 Hz 50-100 Hz 50 Hz RangeWi-Fi
coverage 10 m 10 m 2-3 m 2-4 m Bluetooth coverage Bluetooth coverage Can track
any objectNo Yes Yes Yes No No No Open SourceSW + HW No No SW + HW SW No No
Price$195 $390 + ~$400 Lighthouse $360 + ~$400 Lighthouse Printer & camera ~$30
(used Kinect) $299 $450

¹ The precision of SlimeVR and HaritoraX tracking technology depends on your
setup, on the plane used for measurement, and on how your back bends.
² AprilTag requires additional waist tracker with a phone or other tracking
technology (has reliable 180° coverage without).


AVAILABLE TRACKER SETS

The base set of five trackers is sufficient to cover lower-body movement (legs
and waist) and is widely supported by VR games and applications. However, with
SlimeVR you can customise your experience in VRChat, NeosVR and LIV to track
specific movements, allowing you to finely track the bones you want with
additional trackers allowing you to track feet, knees, elbows, chest and more!

Tracker Extensions are smaller, auxiliary trackers without batteries or Wi-Fi
capability. They connect to a primary tracker by means of a wire and provide a
simple, comfortable way to add additional tracking points.



The table below illustrates how different sets of SlimeVR trackers can be used
in games and software games and software that support 11-point tracking (like
VRChat, NeosVR or LIV) or six-point tracking (Blade and Sorcery and some other
games). It’s possible to change the layout and focus on what you’d need more,
for example, attaching trackers to elbows instead of feet. SlimeVR can also
partially mix and match with other tracking systems, like tracking lower body
with Vive trackers and elbows with SlimeVR.

SetPrimary trackersExtensionsFor 11-point tracking (VRChat, NeosVR, LIV)For
six-point tracking (B&S and others)Price Lower-Body Set50Waist position &
rotation, foot position, knee position & rotationWaist position & rotation, foot
position$195 Core Set51Waist position & rotation with increased precision¹, foot
position, knee position & rotation, chest position & rotationWaist position &
rotation with increased precision¹, foot position$225 Enhanced Core Set53Waist
position & rotation with increased precision¹, foot position & rotation, knee
position & rotation, chest position & rotationWaist position & rotation with
increased precision¹, foot position & rotation$275 Full-Body Set73Waist position
& rotation with increased precision¹, foot position & rotation, knee position &
rotation, chest position & rotation, elbow position & rotationWaist position &
rotation with increased precision¹, foot position & rotation$350 Deluxe Tracker
Set106A future-proof tracker set for the VR obsessed – with capabilities at
least equivalent to the set above, plus a little something extra for motion
capture, experimentation, and imagination.Waist position & rotation with
increased precision¹, foot position & rotation$560

¹ Hip tracker extension improves spine tracking, which greatly increases
precision while sitting or bending, especially in extreme poses.

Below is a video by ZRock35 that showcases tracking with different SlimeVR sets.
It’s also a good demo of how much better the tracking has become since the
campaign started!




COMMITTED TO OPEN SOURCE & DIY ELECTRONICS

SlimeVR is open hardware driven by open source software and is released under
permissive MIT & Apache 2.0 licenses. This open design empowers the VR community
to expand on the SlimeVR ecosystem, create new devices, add compatibility with
new software, and improve upon all aspects of the project. For our part, we are
focused on helping that community expand SlimeVR infrastructure by adding
support for various devices, protocols, and features. We are part of an active
DIY community, members of which build their own SlimeVR trackers, help others
get into DIY electronics, contribute to our documentation, and develop hardware
with different features and at different price points. All of our hardware is
hacker friendly, and we encourage you to use it in new ways and adapt it to your
needs! You can find documentation about our DIY kits on our website!




SUPPORT & DOCUMENTATION

Our open source software and firmware is in our GitHub repository. We have
guides and schematics for easy DIY and are working with the community to make
them better, more accessible, and compatible with a wide range of hardware and
tools.

More specifically, our documentation is here, and our GitHub repository
contains:

 * The tracker firmware
 * The server software
 * The SteamVR driver

The official hardware design is hosted on OSHWLab:

 * The Tracker Main Board
 * The IMU Module
 * The Tracker Extension Board

Join our community on Discord to meet other VR hackers or to chat about SlimeVR.
You can also find us on YouTube. And, if you have a question for our team, you
can reach out using the Ask a technical question link below.


WARRANTY

SlimeVR includes 2-year manufacturer’s warranty. The warranty starts on the day
when you receive your products. For any warranty-related questions and claims,
visit our Contact Page or use the Ask a technical question link below.


MANUFACTURING PLAN

Production SlimeVR PCBs are fabricated and assembled by LZJ PCB, a contract
manufacturer with whom we have been working for multiple years. IMU modules are
produced by AssemTec Europe. Each board is tested at their factory and by us
after the final assembly. ICOMold is handling injection molding for the tracker
cases, and the final assembly is done by our team and an assembly company in the
Netherlands.


FULFILLMENT & LOGISTICS

After the SlimeVR hardware is manufactured, it is sent to Crowd Supply’s
fulfillment partner, Mouser Electronics, who distributes it to backers
worldwide. You can learn more about Crowd Supply’s fulfillment service under
Ordering, Paying, and Shipping in their guide.


RISKS & CHALLENGES

SlimeVR has faced many challenges during the manufacturing and fulfillment, and
some of them are still ongoing. But thousands of our backers already received
their sets and happily use them, as well as dozens of YouTube reviewers, and
thousands of members of our DIY community. It’s always possible that new
challenges will emerge, but our team is determined and experienced to solve
them.


IN THE PRESS

Geeky Gadgets

"Virtual reality developers, gamers and enthusiasts may be interested in a new
full body tracker gearing up to launch via Crowd Supply. The SlimeVR Full Body
Tracker consists of a set of sensors and software for Full Body Tracking..."

The Virtual Reality Show

"This is the CHEAPEST full body tracking I’ve covered on my channel yet! Slime
VR is a complete game changer considering you DON’T need base stations. "

Hackster News

"Low-cost body tracking pucks require no cameras or base stations, and the
software and firmware are both permissively licensed."

The Mysticle

"This is Full Body Tracking for virtual reality that is for everyone. "

--------------------------------------------------------------------------------





ASK A QUESTION


Ask Crowd Supply about an order
Ask SlimeVR a technical question
Submit a field report about how you used this project

Produced by SlimeVR in Rotterdam, the Netherlands.

Sold and shipped by Crowd Supply.


LOWER-BODY SET

Five SlimeVR trackers, enough to track the position and rotation of your waist
and your knees, as well as the position of your feet. Includes five straps and
one USB Type-C cable.

$195 $8 US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


CORE SET (5+1)

Five SlimeVR Trackers and one Tracker Extension, enough to track the position
and rotation of your waist (with improved precision), your knees, and your
chest, as well as the position of your feet. Includes six straps and one USB
Type-C cable.

$225 $8 US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


ENHANCED CORE SET (5+3)

Five SlimeVR Trackers and three Tracker Extensions, enough to track the position
and rotation of your waist (with improved precision), your knees, your chest,
and your feet. Includes eight straps and one USB Type-C cable.

$275 $8 US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


FULL-BODY SET (7+3)

Seven SlimeVR Trackers and three Tracker Extensions, enough to track the
position and rotation of your waist (with improved precision), your knees, your
feet, your chest, and your elbows. Includes 10 straps and one USB Type-C cable.

$350 $8 US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


DELUXE TRACKER SET (10+6)

10 SlimeVR Trackers and six Tracker Extensions, enough to track the position and
rotation of your waist (with improved precision), your knees, your chest, your
feet, and your elbows – with enough left over to experiment with motion capture
and other innovations. Includes 16 straps and one USB Type-C cable.

$560 Free US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


DIY KIT - FULL-BODY SET (7+3)

Seven DIY SlimeVR Tracker boards and three Tracker Extension boards, enough to
track the position and rotation of your waist (with improved precision), your
knees, your chest, your feet, and your elbows. This DIY kit includes only the
boards and connecting wires for the Tracker Extensions. It does not come with
enclosures, straps, batteries, or other accessories.

$275 $8 US Shipping / $18 Worldwide

Orders placed now ship Dec 13, 2024.

Pre-order


ABOUT THE TEAM

SLIMEVR

Rotterdam, the Netherlands  ·   slimevr.dev

A small company enthusiastically pursuing the goal of bringing accessible VR to
a wide audience.

EIREN RAIN

 eirenliel
 eirenliel

EVA LERAINE

 EvaSachkova


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