Comparison

Mettagroup vs Rhythm LightScore

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Mettagroup

Features
Read full description

Secure attachment. Collaborative relationships. An AI chat and practice system for attachment repair. The Mettagroup mobile app is built around an AI chat for studying attachment theory: what secure and insecure attachment is, how collaborative, secure-functioning relationships work, and how to practice them. The chat is grounded in the teachings of meditation teacher George Haas, and it sits alongside a library of guided meditations and the calendar of the community he founded. George has taught meditation for more than 20 years and was authorized to teach by Shinzen Young in 2002. His work brings together classical mindfulness practice and attachment theory, drawing on his collaborations with the late attachment researchers Mary Main and Dr. Daniel P. Brown. The chat draws on his framework and voice to help you think through your own questions about practice, relationships, and the inner life from the point of view of attachment theory. It is an AI assistant, not George himself, and its answers can be incomplete or mistaken — treat them as a starting point for your own reflection. THE APPROACH George's teaching follows the three-pillar model of attachment repair described by the late Dr. Daniel P. Brown, and two of those pillars shape the app: - Guided meditations support the second pillar: developing mentalizing and emotional-regulation skills through practice. - The AI chat supports the third pillar: learning about collaborative, secure-functioning relationships. The calendar helps you find Mettagroup courses and workshops that continue this learning. The first pillar — remapping early relational patterns through Ideal Parent Figure work — is the deeper one-to-one work at the center of Mettagroup's live programs. WHAT'S INSIDE - AI study chat: ask about attachment theory, secure-functioning relationships, and your own practice, and pick up earlier conversations where you left off. - Guided audio meditations: a library organized into series such as Always Cool and Always Kind. Save recordings for offline listening and return to the ones that meet you where you are. - Progress tracking: keep your completed meditations and practice in view as you go. - Community calendar: browse upcoming sits, talks, workshops, and courses from the Mettagroup community, and sign up for the ones that call to you. WHO IT'S FOR Mettagroup is made for adults (18+) who want to understand what secure attachment is and how to earn it if they weren't raised with it — what attachment researchers call earned security. That takes study and steady practice over time, and the app is built to support both. It is offered as an educational and personal-development resource — not a substitute for professional care or for the relationships in your life. This app is for educational and personal-development purposes only. It is not a medical device and does not diagnose, treat, cure, or prevent any medical or mental-health condition. A place to study, to sit, and to keep going. Terms of Use: https://app.mettagroup.org/legal/terms Privacy Policy: https://app.mettagroup.org/legal/privacy

About

Rhythm LightScore

This app provides a daily "LightScore" based on your exposure to daylight, its consistency, and your pre-bedtime phone use. It offers insights into your light habits and suggests improvements for better well-being.

Highlights
  • Daily LightScore out of 100
  • Measures Light Time, Consistency, and Dark Time
  • Integrates with Apple Watch Health data
  • Uses phone camera as a light meter
  • Visualizes daily progress with Sol character
  • Sunset photo capture and sharing
Features
Read full description

Your LightScore is one number for the light you actually got today: how much daylight, how early it reached you, and how steady your days are. Rhythm measures it for you, scores the day against the sun rather than the clock, and names the one thing worth doing about it. YOUR LIGHTSCORE Each day gets a LightScore out of 100, built from three parts. Light Time is how much daylight you get, and when. Consistency is how steady your daylight is day to day. Dark Time, if you connect Screen Time, is based on phone use in the hour before bed. Tap any part of the ring to see its history by week, month, six months or year. MEASURED, NOT LOGGED If you wear an Apple Watch, Rhythm reads its Time in Daylight from the Health app. Nothing to remember, nothing to tap. If you don't, your phone's front camera becomes a light meter: hold it facing you, and the minutes you measure count toward your LightScore. MEET SOL Sol, a hand-drawn sunflower, lives in your daylight ring and keeps pace with your day: stretching at sunrise, standing tall when you reach your goal, asking for light when you fall behind. Tap Sol and see what happens. THE LIGHT METER A live lux readout that tells you what a room is actually worth. An overcast window is a hundred times brighter than a well-lit office, and it takes a meter to believe it. The app itself is painted by the light you're in, so the screen changes as you walk to the window. SUNSET LOG Catch the sunset and keep the sky. Rhythm suggests the photos you took around sunset, and turns your week of skies into one image to share. PHONE USE BEFORE BED Connect Screen Time to see your phone use in the hour before bed, and how it shapes your Dark Time. The report stays on your phone. FOR THE RHYTHM LIGHT Rhythm makes a 100,000-lux sunlight generator for indoor days. With one at home, the app turns it on and off, sets its brightness, runs routines that follow sunrise and sunset on the days you choose, and can ring a wake alarm after your light comes on. Everything else works without it. ON APPLE WATCH Today's daylight and Sol on your wrist, read straight from Health. HONEST ABOUT WHAT IT KNOWS Coverage sits next to every finding ("15m in the light today, measured across 3 check-ins"), so a sampled day never passes as a watched one. The camera reading is an estimate, good to a band rather than to the lux, and the app says so plainly. PRIVACY As a light meter, the camera reads exposure settings, not pixels: no photo or video is captured, and it runs only while the app is open. Sunset photos stay on your phone unless you share them. Rhythm never writes to Health; it reads Time in Daylight and your sleep schedule, nothing else. Your readings are stored with your account so your history survives a new phone, and Delete Account removes all of it, from inside the app. Rhythm is a wellness app. It does not diagnose, treat, cure or prevent any condition, and it is not a substitute for medical advice.

Screenshots

Mettagroup4 screens
Rhythm LightScore4 screens

Verdict

The call

The clearest difference is in-app purchases: Rhythm LightScore at none against Mettagroup's 5. Rhythm LightScore also leads on update cadence (every 4 days vs every 2 months). Mettagroup's advantage is iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Mettagroup sells 5 in-app purchases, starting at $20.00 per month. Rhythm LightScore asks for nothing beyond the download.

UpkeepUpdate frequency

Mettagroup ships an update every 2 months, Rhythm LightScore every 4 days. The most recent releases landed on October 28, 2026 and November 6, 2026 respectively.

Scorecard3 real differences · 7 level
Mettagroup versus Rhythm LightScore: the parameters behind the verdict, then further details
ParameterMettagroupRhythm LightScore
PriceFreeFree
Rating—5.0 (5 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 2 monthsEvery 4 days — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPodiPhone, Apple Watch
Requires iOS15.1 — better18.0
Further details — not scored
Size41 MB26 MB
Age rating17+4+
DeveloperMettagroupRhythm Innovations, Inc.

In-app purchases

5 purchases

Mettagroup

Subscriptions5
  • Kaleidoscope (discounted)$20.001 Month
  • Standard monthly$30.001 Month
  • Facilitator monthly$50.001 Month
Show 2 more
  • Standard annual$300.001 Year
  • Facilitator annual$500.001 Year
None

Rhythm LightScore

No in-app purchases

Questions

Is Mettagroup free?
Mettagroup is free to download, with in-app purchases available.
Is Rhythm LightScore free?
Rhythm LightScore is free to download, with no in-app purchases.
Do Mettagroup or Rhythm LightScore have ads?
Neither Mettagroup nor Rhythm LightScore shows ads.
Which is updated more often, Mettagroup or Rhythm LightScore?
Mettagroup ships an update every 2 months, and Rhythm LightScore every 4 days. Most recently, Mettagroup was updated on October 28, 2026 and Rhythm LightScore on November 6, 2026.

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