IdeaWell

Project ideas from Hacker News discussions.

Giving up on smart rings

Original Article

Hacker News Discussion

📝 Discussion Summary (Click to expand)

Prevalent themes in the Hacker News discussion about smart rings

  1. Battery life and durability concerns
    Users frequently note that tiny batteries degrade quickly, limiting the usable lifespan of rings.

    “My experience with devices with very small batteries is that they lose capacity (below 80%) quickly after a couple of years of daily use.” – nexus6
    “I’ve had a RingConn ring since December 2024… the battery that originally lasted 2 weeks lasts only about 2 days.” – iamworknow

  2. Subscription and cost frustrations
    Many commenters criticize mandatory subscriptions or high prices, preferring devices without recurring fees.

    “Whoop wanted $350 for a subscription fee which I just found really ridiculous.” – kj4211cash
    “Smart rings aren’t meant to last more than a couple years… you’re more likely going to be paying for a smart ring subscription than a physical object.” – peab

  3. Sizing, adjustability, and safety issues
    The inability to resize rings (especially metal/tungsten bands) creates problems when finger size changes or during activities like weightlifting, raising safety concerns.

    “Adulting: buying rings that are the right size. eg My tungsten wedding ring cannot be resized either.” – Supermancho
    “A health and fitness tracker that cannot be worn during a common health and fitness activity seems highly problematic as a form factor.” – catigula

  4. Questions about data accuracy and usefulness
    Participants debate whether the metrics (especially sleep tracking) are accurate enough to be actionable, often comparing rings to watches or questioning the need for constant monitoring.

    “I wear an Oura Ring for the complete suite of telemetry… The workout tracking is kinda the least interesting aspect for me. It’s more about the long term trends of activity, sleep, heart rate, stress, etc.” – louthy
    “I like my oura ring but I find its terrible for fitness tracking. It takes nowhere near enough readings to actually get an idea of what zones my heart rate is in.” – freejazz

🚀 Project Ideas

RingSync: Local Health Data Bridge for Smart Rings

Summary

  • Provides a privacy‑first, open‑source middleware that syncs smart ring sensor data (heart rate, sleep, SpO₂) directly to Apple Health or Google Fit without relying on the vendor’s cloud app.
  • Core value: Eliminates the dreaded Google/Fitbit app experience, gives users Apple Health support today, and keeps data on the user’s device.

Details

Key Value
Target Audience Owners of Fitbit Air, Oura, RingConn, or other Bluetooth smart rings who dislike mandatory apps and want Apple/Google health integration.
Core Feature Bluetooth LE listener that parses ring notifications, converts to standard HealthKit/Google Fit schemas, and writes locally; optional background sync.
Tech Stack Swift (iOS) / Kotlin (Android) + Bluetooth LE library, HealthKit/Google Fit SDKs, optional Electron desktop companion.
Difficulty Medium
Monetization Revenue‑ready: “Freemium – free sync, $4.99/yr for premium features (auto‑export, custom tags).”

Notes

  • HN users complained about the Google Health app’s 1‑2★ ratings and longed for Apple Health support (spike021, almyk). RingSync gives them that today without waiting for vendor updates.
  • Enables local‑first workflows praised by commenters using Gadgetbridge and open_oura, increasing trust and discussion around data ownership.

SizeFlex: Adjustable Sizing Kit for Smart Rings

Summary

  • A set of interchangeable, medical‑grade silicone liners and a micro‑adjustable inner band that lets users tighten or loosen a smart ring in 0.5 mm increments without buying a new ring.
  • Core value: Solves the finger‑size‑change problem (weight loss/gain, swelling during workouts) and makes tungsten or other non‑resizable rings wearable long‑term.

Details

Key Value
Target Audience Smart ring wearers who experience finger size fluctuations (weight change, athletes, pregnancy) and those hesitant to buy non‑resizable tungsten rings.
Core Feature Stackable silicone shims + a worm‑drive micro‑adjustment ring that fits inside the existing smart ring housing.
Tech Stack Medical silicone molding, stainless‑steel micro‑adjustment mechanism, 3D‑printed fitting jig for sizing guide.
Difficulty Low
Monetization Revenue‑ready: “$19.99 kit (3 sizes + tool).”

Notes

  • Users lamented being unable to resize tungsten rings (spike021, canucker2016, dreamcompiler) and wanting to wear rings while lifting (world2vec, louthy). SizeFlex lets them keep the ring on through workouts and weight changes.
  • Low technical risk; can be sold via existing jewelry or fitness accessory channels, sparking discussion about hybrid jewelry‑tech products.

RingVault: On‑Device Data Logger & Export Tool

Summary

  • Replaces the vendor’s cloud‑dependent app with an open‑source firmware/UI that stores all sensor samples locally on the ring’s flash (or paired phone) and offers encrypted export via Bluetooth, USB, or QR code.
  • Core value: Eliminates subscription fees, mitigates privacy concerns, and ensures data longevity even if the vendor shuts down servers.

Details

Key Value
Target Audience Privacy‑conscious smart ring owners (Oura, RingConn, Whoop refugees) who dislike monthly fees and cloud lock‑in.
Core Feature Local circular buffer (e.g., 30 days) + companion app to view trends, export CSV/JSON, and trigger automated backups to personal cloud (Nextcloud, Syncthing).
Tech Stack C/C++ firmware for Nordic nRF52, Kotlin/Swift companion app, SQLite for local storage, optional WebAssembly dashboard.
Difficulty High
Monetization Hobby (open source) – optional donations or $0.99 “supporter” app unlock for cloud sync plugins.

Notes

  • Commenters praised Gadgetbridge and open_oura for local data (post‑it, _ks3e) and decried subscription fatigue (kj4211cash, iamworknow). RingVault gives a complete, self‑hosted alternative.
  • Enables future discussion around data ownership, GDPR‑style exports, and community‑built watchfaces/analytics.

GestureRing: Programmable HID‑Emulator Smart Ring

Summary

  • A Bluetooth LE ring that doubles as a configurable macro controller: users map gestures (tap, double‑tap, spin, flick) to keyboard shortcuts, mouse actions, or custom BLE HID profiles for controlling presentations, IDEs, or smart home scenes.
  • Core value: Turns a smart ring into a productivity/input device, addressing the desire for gesture‑based control expressed by bryanrasmussen and villgax, while retaining health tracking as a secondary feature.

Details

Key Value
Target Audience Developers, power users, and presentation enthusiasts who want a discreet, always‑on input device without wearing a separate wrist macro pad.
Core Feature IMU + touch sensor firmware that recognizes ≥5 gestures, stores profiles in flash, and emits standard HID keyboard/mouse or custom BLE commands via companion app.
Tech Stack Nordic nRF53 SoC, Zephyr RTOS, Bluetooth HID host, Swift/Kotlin config app, optional Web UI for gesture mapping.
Difficulty Medium
Monetization Revenue‑ready: “$79 ring (hardware) + free app; premium gesture packs $4.99 each.”

Notes

  • bryanrasmussen imagined a ring for “gestural navigation” and villgax asked for an HID emulator to send keyboard/mouse events. GestureRing makes that real.
  • Sparks discussion about alternative input modalities, accessibility, and the convergence of wearables and productivity tools.

Read Later