SlimeVR Butterfly Trackers
Open-source inertial full-body VR tracking
- Battery / power
- 90 mAh ↗
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At a glance
The differences that matter
HTC VIVE Ultimate Tracker
Camera-based body movement capture in virtual reality
Keep in mind Manufacturer advises against very low light and direct sunlight.
Published specifications and documented constraints. See the full comparison below for prices and sources.
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| Haptics & body trackingAdd a model |  |  |
|---|---|---|
| Prices · all markets | $279 USD≈ €249 EURECB 2026-10-13Global · Announced price · Preorder 1 offer records & sources$279 USD≈ €249 EURECB 2026-10-13 Global · Announced price PreorderCrowd Supply (official SlimeVR campaign) Core Set Bundle: six trackers, straps and dongle Official live campaign ordering section estimates Jan 31, 2027 dispatch. This is an estimate, not completed delivery. Shipping listed separately. Original source market label: International.Check merchant offer ↗Price source ↗ Checked 2026-10-12 | Price not verified 0 offer records & sourcesNo verified price in this audit. |
| Designed for | Open-source inertial full-body VR tracking ↗ | Camera-based body movement capture in virtual reality ↗ |
| Form factor | Body-worn Butterfly tracker set ↗ | Body-mounted six-degree-of-freedom tracker ↗ |
| Tracking | Inertial full-body tracking ↗ | Two wide-field cameras for inside-out tracking ↗ |
| Battery / power | 90 mAh ↗ | Not verified |
| Charging | USB-C or optional charging dock ↗ | USB-C; stated 2.2 hours Quick Charge3.0 or 3.2 hours at5 V/1 A ↗ |
| Weight | Less than 10 g per tracker ↗ | 94 g ↗ |
| Software | Open-source SlimeVR ecosystem ↗ | Not verified |
| Sales | Official shop preorder ↗ | Not applicable to this category |
| Dimensions | 56 × 35 × 7 mm ↗ | 77 x 58.6 x 27.3 mm ↗ |
| Runtime | Up to 48 hours ↗ | Up to 7 hours ↗ |
| Connectivity | Custom 2.4 GHz ESB radio with dedicated dongle; no Wi-Fi required ↗ | 2.4 GHz proprietary link and 5 GHz Wi-Fi ↗ |
| Refresh rate | 100-200 Hz target; not finalized ↗ | Not applicable to this category |
| Firmware | Wireless OTA updates ↗ | Not applicable to this category |
| Receiver | Not applicable to this category | VIVE Wireless Dongle required; up to five trackers per dongle ↗ |
| Compatibility | Not applicable to this category | Supported VIVE headsets or third-party SteamVR headsets through VIVE Hub ↗ |
| Availability | Preorder; campaign shows manufacturer prototype photos. Production enclosure and colour may change. | Tracker hardware is commercially documented; exact single-device retail price not verified. Dongle, straps and compatible headset are separate requirements. |
| Important context |
| |
| Editorial pick & release | No editorial ranking recorded | #4 · Our Top 10 Haptics & body trackingRelease date not verifiedFirst retail release |
| Evidence | Manufacturer source Checked 2026-10-12 | Manufacturer source Checked 2026-10-13 |
Battery claims use different conditions and are not a controlled benchmark. “Not verified” is an evidence gap, not a missing feature. Prices are dated regional snapshots. Deposits, bundles and historical launch prices are labelled. Brightness measurement methods and battery workloads vary by manufacturer.