Circular Ring 2 Release Notes (Aug 2026): The Biggest Update Ever, 100% Bluetooth Stability, and a New Foundation for Blood Pressure and Glucose Estimate

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The problem smart ring users actually report

Smart rings are small and worn 24/7, and because of that, many issues can occur in different ways. We've been collecting all the users' reviews, every support ticket, and every forum thread and complaints. We rebuilt the layer underneath all of it and resolved all of them.

100% Bluetooth stability, zero dropouts

Bluetooth dropout was the most reported issue. It could be during a firmware update, a sync or a live sport session, for example. The old behavior was a reconnection loop: the ring would lose its link mid-workout or overnight, and the only fix was to open the app, forget the device, and re-pair it manually. In the meantime, data windows were lost.

The new update replaces the entire connection protocol. The ring now holds a rock-solid link to your phone, and if a connection is ever interrupted, it reconnects automatically and instantly, with no manual step. We call it 100% stability because that is what our internal testing across hundreds of devices shows: zero dropouts, zero reconnection loops, zero missed data windows. Your ring stays connected, and your data keeps flowing without you thinking about it.

Every app issue, fixed

This is not a list of patch notes. It is a list of the problems you told us about, with what we did about each one.

• Bluetooth: fixed. The connection no longer drops, and reconnection is now automatic and instant, not a manual re-pair.
• Sport sessions: fixed. Workouts now record from start to finish with no gaps, no lost sessions, and no stuck reports. The data is complete, and it syncs the moment you finish. If ever there is an issue you can still go to the next step and data will populate automatically afterward.
• Sync: fixed. There will be no sync stuck because of the ring-app process. Data collected overnight or during a workout will reach your app, always.
• Sleep detection: fixed. The ring now detects when you fall asleep and when you wake up with far more precision, across a wider range of users.

If you experienced any of these, update the app. They are gone.

A completely redesigned sport experience

Sport Session V2 is the biggest rework of our fitness tracking to date. Two things matter in a workout: how hard you are pushing and how fast you are moving. The new session view gives you both.

• Heart rate zones now place every beat into one of five zones, from warm-up through aerobic to peak. Instead of a raw number, you see exactly when you were in the fat-burning zone and when you hit your maximum.

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• Pace metrics track your speed per kilometer or per mile, so runners and cyclists can see splits without a separate device.
• Refreshed reports and maps rebuild the post-workout screen with your route, your zone distribution, and your pace, all in one clean view.

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And because the sync and stuck-report issues are fixed, the session you finish is the session you see, every time.

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Improved ECG and Heart Rhythm

Circular Ring 2 is the only smart ring with ECG, powered by a classification algorithm that is FDA-cleared. This update makes that feature faster and more reliable with 100% classification result.

• The reading now relies far less on your internet connection, so an ECG completes reliably even in low-signal areas.
• The report is richer, with more advanced metrics than before.
• The waveform renders more clearly, so you can actually read the signal.
• The classification is faster and more reliable across repeated readings.

In short, the on-demand ECG measurement is now a first-class and mature feature rather than a novelty.

A more thoughtful app, screen by screen

This release also redesigns the parts of the app you use every day.

• Wake Up is redesigned so the morning alarm and your sleep insights live together in one clear view. The smart alarm is performed from the smartphone, not the ring, which has no vibration motor.
• Medication Reminders are redesigned to be simpler to set and harder to miss.
• Coherence is redesigned with a cleaner read of your balance across body and mind.
• Advanced Analytics is redesigned, with labels, units, goals, spacing, and tooltips all corrected and made consistent across every chart.
• Ring Setup is streamlined, so getting started during registration takes fewer taps and no guesswork.
• Support is easier to reach, with an updated link right in the app and an improved Kira support 24/7 assistance.

Full changelog

App version 29.23.3, released August 26, 2026:

https://www.circular.xyz/release-notes

The foundation for what comes next

This backend is not just a fix; it is a foundation. Blood pressure, glucose monitoring, and longevity insights all require a backend that can handle new type of data, with new architecture and high-frequency biosignal data with medical-grade reliability.

That is exactly what we have built. Blood pressure logic is already connected and tested with the app, with design adaptation remaining, and glucose tracking is now under active development on the same foundation.

For the community, we are also building gamification on top of it: Coins you earn for hitting your health goals, Leaderboards to compete with friends, and Groups where you can train, sleep, and recover together. This update makes all of it possible.

How to update

Open the Circular app on your phone. The update appears automatically. Update the app first, then update your ring firmware from the ring settings screen. The whole process takes less than 3 minutes. Your data is safe, your settings are safe, and nothing is lost.

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Haz el test: descubre cuál es tu nivel

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Preguntas frecuentes

Q: Will I lose my data when I update?

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A: No. All your historical data is preserved. The update only improves how new data is collected and synced.

Q: Is the Bluetooth fix really 100%?

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A: Our internal testing across hundreds of devices shows zero dropouts after the update. If you still experience a connection issue, contact support and we will resolve it.

Q: What are heart rate zones, and why do they matter?

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A: Heart rate zones split your effort into five bands, from warm-up through aerobic to peak. Knowing which zone you are in tells you whether a session was a recovery run, a fat-burning session, or a max-effort interval, without guessing from a raw number.

Q: What is new in App Version 29.23.3?

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A: Sport Session V2, improved ECG and Heart Rhythm, redesigned Wake Up, Medication Reminders, Coherence, and Advanced Analytics, a new Ring Setup Flow, Android 16 support, and bug fixes across the board, all built on the new backend.

Q: What is new in Ring Firmware 1.6.9?

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A: Sharper ECG readings, more accurate sleep staging, enhanced sleep detection across a wider range of users, a more reliable Bluetooth connection, and smarter wearer detection. It also lays groundwork for upcoming blood pressure and glucose tracking.

Q: When are blood pressure and glucose coming?

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A: Blood pressure is in the final integration and tested. Glucose estimate is in active development. This backend update was a required prerequisite, and blood pressure logic is already connected and tested with the app. We will announce availability when ready.

Q: Does this update cost anything?

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A: No. It is free, like every Circular update. No subscription, ever.

References

• Circular Release Notes Archive, https://www.circular.xyz/learn
• Circular Ring 2 Release Note Page, https://www.circular.xyz/release-notes