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# I Measured 28 Smart Rings by Hand: The Smart Ring Database Is Live
- URL: https://www.lordofthesmartrings.com/smart-ring-database-28-rings-measured/
- Published: 2026-11-10T20:03:46.000Z
- Updated: 2026-11-10T20:03:46.000Z
- Description: I put all 28 of my smart rings on one bench and measured them with the same caliper and scale: weight, band width, wall, thickest point, inner and outer diameter. Every number has a photo. Size 9 is not one size, and the free database lets you compare rings at real size.
- Author: LORD of the SMART RINGS
- Tags: 💍 Smart Rings, 🔬 Accuracy Tests

Smart rings are so small that every millimetre counts, down to tenths and hundredths. I already struggle to picture the difference between a 47 mm and a 52 mm watch face, let alone the differences between tiny smart rings.

Spec sheets and marketing materials can be misleading, so a transparent comparison helps. The numbers get trickier because of the wide range of ring sizes. Most of my smart rings fit my index and middle fingers and are sizes 9 to 10 (every smart ring maker sizes a little differently).

In short, I took all 28 smart rings I have, put them on one bench and measured them myself.

[**Open the Smart Ring Database →**](https://www.lordofthesmartrings.com/smart-ring-database/)

## What's in the database

- Weight, band width, wall thickness, thickest point, and inner and outer diameter for every ring, measured with the same caliper and the same scale.
- A photo of the display behind every single reading. If a number looks odd, you can check it yourself.
- Compare up to four rings at true scale, or see them at real size on your screen using a bank card.
- Filters for health, payment and voice rings and for ring size, plus a fit estimate against the ring you already wear.
- Photos and short videos of every ring: from above, from the side, in the palm, on a finger and on the charger.

![](https://storage.ghost.io/c/01/ca/01ca9f1d-13b0-43d5-a8fe-dac2f7d3dc2f/content/images/2026/11/CleanShot-2026-11-09-at-10.10.38@2x.png)

![](https://storage.ghost.io/c/01/ca/01ca9f1d-13b0-43d5-a8fe-dac2f7d3dc2f/content/images/2026/11/CleanShot-2026-11-09-at-10.11.17@2x.png)

## I vibecoded my own measuring tool

I didn't want to type 170 numbers into a spreadsheet and hope I got them all right. So I vibecoded my own photo and measurement lab in Lovable: [LOTSR Measurement Studio](https://lotsr-measurement-studio.lovable.app/?ref=lordofthesmartrings.com). A camera above the bench photographs every reading, the tool reads the caliper and scale displays automatically, and I check each value against the photo.

![LOTSR Measurement Studio weighing the Pebble Index 01: a camera above the bench films the scale with the ring, and the app reads 4.95 g](https://storage.ghost.io/c/01/ca/01ca9f1d-13b0-43d5-a8fe-dac2f7d3dc2f/content/images/2026/11/measurement-studio-scale-en.jpg)

My vibecoded Measurement Studio: a camera above the bench photographs every reading, and the tool reads the scale display.

Every ring went through the same routine: weight, wall, thickest point, width, inner and outer diameter. Then a set of photos and videos on the same background. It's a careful bench test, not a lab report, so treat differences of a few hundredths of a millimetre as a tie.

## Three interesting finds

- **Size 9 is not one size.** The inner diameter of the size 9 rings I measured ranges from 18.69 to 20.31 mm. That's a 1.62 mm spread, roughly two whole sizes.
- **The lightest ring** is the Oura Ring 5 at 2.34 g, just 0.01 g ahead of the Omni Ring.
- **The slimmest builds:** the Niceboy One has the narrowest band at 4.99 mm (note: it is a payment-only ring), and the RingConn Gen 2 has the thinnest wall at 2.07 mm.

## Watch all 28 rings

In the video, I show every ring one by one, with all its photos and clips, so you can see how each one looks in real life.

🔥

****Black Friday 2026 is live:** Ultrahuman Ring PRO 22% off ($373.62, until November 30), Oura Ring 4 at $249 on Amazon and Circular Ring 2 $100 off. RingConn’s main sale starts November 19 (status on November 7, 2026). All deals, checked against my night heart rate test: [****Black Friday 2026 Smart Ring Deals →**](https://www.lordofthesmartrings.com/black-friday-2026-smart-ring-deals/)

## Missing a ring?

The database will keep growing. If your ring isn't in it yet, [suggest it](https://www.lordofthesmartrings.com/contact/), and I'll try to get it on the bench.