External Memory For Your Brain

Where can I learn more about Index 01?

Read our announcement blog post and watch the video.

How does it work?

People usually wear it on the index finger. Inside the ring is a button, a microphone, a Bluetooth chip, memory, and a battery that lasts for years. Click the button with your thumb, talk into the mic, and it records to internal memory. When your phone is in range, the recording is streamed to the Pebble app. It's converted to text on-device, then processed by an on-device large language model (LLM) which selects an action to take (create note, add to reminders, etc).

When do I pick my size?

You'll be able to pick your ring size and color after placing a pre-order. If you have a 3D printer, you can print our CAD designs to try on. We're also planning a sizing kit. You can view the measurements of the inner diameter of each ring size. Index 01 is available in US ring sizes 7 to 13 in all three finishes (polished gold, matte black and polished silver). Size 6 is available in polished gold only. Do you want a size 14/15 ring? Sign up here for updates.

How long does the battery last?

Roughly 12 to 15 hours of recording. On average, I use it 10-20 times per day to record 3-6 second thoughts. That's up to 2 years of usage.

Is it secure and private?

Yes, extremely. The connection between ring and phone is encrypted. Recordings are processed locally on your phone in the open-source Pebble app. The app works offline (no internet connection) and does not require a cloud service. An optional cloud storage system for backing up recordings is available. Our plan is for this to be optionally encrypted, but we haven't built it yet.

Is a paid subscription required?

No.

What kind of battery is inside?

Index 01 uses silver-oxide batteries.

Why can't it be recharged?

We considered this but decided not to for several reasons:

1. You'd probably lose the charger before the battery runs out!
2. Adding charge circuitry and including a charger would make the product larger and more expensive.
3. You send it back to us to recycle.

Wait, it's single use?

Yes. We know this sounds a bit odd, but in this particular circumstance we believe it's the best solution to the given set of constraints. Other smart rings like Oura cost $250+ and need to be charged every few days. We didn't want to build a device like that. Before the battery runs out, the Pebble app notifies and asks if you'd like to order another ring.

Is it always listening?

No. It only records while the button is pressed. It's not designed to record your whole life, or meetings.

Does it do health tracking like Oura?

Nope

How durable and water-resistant is it?

It's primarily made from stainless steel 316, with a liquid silicone rubber (LSR) button. It's water-resistant to 1 meter. You can wash your hands, do dishes, and shower with it on, but we don't recommend swimming with it.

Does it work with iPhone and Android?

Yes

I love customizing and hacking on my devices. What could I do with Index 01?

Lots of stuff! Control things with the buttons. Route raw audio or transcribed text directly to your own app via webhook. Use MCPs (also run locally on-device! No cloud server required) to add more actions.

Is this an AI friend thingy or always-recording device?

No.

Is there a warranty?

Yes, we warrant against manufacturing defects for 30 days after you receive your order. See our full warranty.

How does shipping work?

All prices are in USD.

All shipments are sent from our warehouse in Asia via courier with tracking. Be prepared - your country may have taxes, tariffs, customs or duties fees. Shipments are sent 'DDP' which means that all taxes, tariffs and duties are prepaid. We'll contact you when your ring is ready to confirm your address and request any necessary payments.