Comparison

Sonar vs Arc Timeline 4

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

Head to head
About

Sonar

Unify data from all your wearables and lifestyle trackers to gain personalized health insights. Understand your sleep, recovery, stress, and activity with AI-powered analysis and daily guidance to optimize your well-being.

Highlights
  • Syncs with multiple wearables and apps
  • AI-powered personalized health insights
  • Daily scores for recovery, sleep, and stress
  • Detailed training analytics
  • 24/7 vitals monitoring
  • Tailored health recommendations
Features
Read full description

Your body is talking. Are you listening? Sonar unifies all of your wearables, lifestyle, and biomarker data to unlock personalized insights and detection once reserved for elite athletes and biohackers. Trusted by 250,000+ users across 170+ countries, Sonar helps you cut through the noise across sleep, recovery, stress, activity, and nutrition - so you can focus on what actually matters. Sonar isn't just another health tracker. It merges the latest medical, sports and data science with AI engines that continuously surface subtle shifts and patterns across millions of data points, helping you know when to push, when to pause, and where to focus next. FEATURES: Personalized intelligence Sonar AI is a personal health agent grounded in the data across your wearables, health apps, and connected devices. Ask questions, understand changes in your scores, and get answers that reflect your actual data - not generic advice. Sonar AI also remembers personal context you give it like training goals, travel, or new routines, and factors it into how it interprets your data over time. Sync everything Fragmented data means missed signals. Connect Apple Watch, Garmin, Oura, Fitbit, Strava, Withings, MyFitnessPal, Peloton and many more. Daily scores and guidance Recovery, Strain, Sleep, Stress, Energy, and Nutrition scores help you understand your day at a glance, with practical guidance to improve. Correlations & comparisons See how any two metrics relate over time. Plot exercise against sleep, alcohol against HRV, or stress against recovery to surface the patterns driving how you feel each day. Compare up to six metrics at once, or focus the view on a single category like activity, sleep, or recovery. 24/7 vitals monitoring Track trends in HRV, resting heart rate, respiratory rate, blood oxygen, body temperature, and more, and get notified when values move outside your typical range. Training analytics All workouts in one place, with detailed summaries, heart rate zones, and training load and balance to help you build fitness without burnout. Widgets, Apple Watch & desktop app Keep Sonar close with beautiful widgets and an Apple Watch app, and explore your data on the big screen at www.sonarhealth.co Peer benchmarks See how you compare to people like you (and the broader community) across key metrics. Make it yours Choose the sections, metrics, wallpapers, and views that matter most to you, including a Favorites view for the health data you care about most. Tailored recommendations Add your medications, family history, and conditions to receive personalized checkup, vaccine, and screening recommendations based on age, sex, history, and the latest medical guidance. PUTTING PRIVACY FIRST Your health data is yours - we do not sell personal data. Our goal is to build an experience our users love, and all product and architecture decisions are built around maximizing user privacy. SUBSCRIPTION AND TERMS Sonar offers a meaningful free experience, empowering you to start transforming your health today with no strings attached. Current-day Recovery, Sleep, Strain, and Nutrition scores are free for all users. It's all part of our mission to accelerate longer, healthier, and happier lives globally. If you're looking to take your health journey to the next level, you can upgrade to Sonar Pro at any time for access to a suite of powerful features we think you'll love. Always consult with your doctor prior to making any medical decisions. Privacy Policy: https://www.sonarhealth.co/legal/privacy-policy/ Terms of Service: https://www.sonarhealth.co/legal/terms-of-service/

About

Arc Timeline 4

This app automatically tracks your location history, including how you travel and how long you stay at places. It learns your habits to provide a detailed, searchable timeline of your daily life, offering insights into your activity and health metrics.

Highlights
  • Automatic background location recording
  • Smart learning engine for place recognition
  • Detects over 20 activity types
  • Searchable trip and place history
  • Health and activity insights (heart rate, calories)
  • Data stored on device with optional iCloud backup
Features
Read full description

Arc Timeline automatically records where you go, how you get there, and how long you stay - all in the background, with no buttons to press. A smart learning engine gets more accurate the more you use it, building a detailed, searchable timeline of your daily life. Your trips, your places, your history - recorded effortlessly. WHAT ARC TIMELINE DOES ▸ Automatically detects and records your visits and trips ▸ Learns your places and recognises them by name ▸ Detects walking, running, cycling, driving, train, bus, airplane, and 20+ more activity types ▸ A learning engine that improves over time, personalised to you ▸ Search your entire history - find any place, any trip, any day BUILT FOR QUALITY ▸ High quality GPS data with advanced Kalman filtering ▸ Reliable background recording with intelligent sleep mode ▸ Built for iOS 26 with Liquid Glass design ▸ Full dark mode support YOUR DATA, YOUR DEVICE ▸ All data stored on your device ▸ Optional iCloud backup to your private iCloud account ▸ No accounts, no sign-ups, no data shared with third parties ▸ Export your data anytime in standard JSON format HEALTH & ACTIVITY INSIGHTS ▸ Heart rate, calories burned, steps, and altitude for every trip and visit ▸ Import workouts from Apple Health ▸ Sync visits to your calendar ▸ Places tab with visit history, occupancy charts, and geographic reports A free trial is included. An active subscription or lifetime purchase is required after the trial period. Terms of Use (EULA): https://www.bigpaua.com/arcapp/terms

Screenshots

Sonar4 screens
Arc Timeline 44 screens

Verdict

The call

The clearest difference is rating: Sonar at 4.6 against Arc Timeline 4's 3.9. Sonar also leads on ratings volume (335 vs 23) and review sentiment (69% vs 61%). On price, update cadence, ads and in-app purchases 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. Sonar sells 7 in-app purchases, starting at $5.99 per month and Arc Timeline 4 sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Sonar holds the better App Store score, 4.6 against 3.9. That said, the two scores are not equally well evidenced: Sonar has 335 ratings behind it against 23, so its average is the more settled of the two. Written reviews point the same way: 69% of Sonar's written reviews are positive against 61% of Arc Timeline 4's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on September 26, 2026 and September 27, 2026 respectively.

Scorecard4 real differences · 6 level
Sonar versus Arc Timeline 4: the parameters behind the verdict, then further details
ParameterSonarArc Timeline 4
PriceFreeFree
Rating4.6 (335 ratings) — better3.9 (23 ratings)
Positive reviews68.7% of reviews — better60.5% of reviews
Number of ratings335 — better23
Update frequencyWeeklyWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS16.6 — better26.0
Further details — not scored
Size117 MB64 MB
Age rating4+4+
DeveloperSonar Health, Inc.Matthew Bruce Greenfield

Customer experience

Sonar

All ratings335 ratings
Positive90.1%
Neutral3.0%
Negative6.9%
Written reviews150 reviews
Positive68.7%
Neutral8.0%
Negative23.3%

Arc Timeline 4

All ratings23 ratings
Positive69.6%
Neutral0.0%
Negative30.4%
Written reviews38 reviews
Positive60.5%
Neutral5.3%
Negative34.2%

Bugs and requests

Sonar

Reported bugs

3 issues
  • Inconsistent data syncing
  • Crashes and freezes
  • Unreliable notifications

Requested features

4 requests
  • Customizable widgets
  • Deeper data analysis and insights
  • Improved historical data tracking
  • Integration with more wearable devices

Arc Timeline 4

Not enough reviews yet to summarise bugs or requests.

In-app purchases

7 purchases

Sonar

Subscriptions4
  • Sonar Pro - Monthly (Legacy)7 Days trial$5.991 Month
  • Sonar Pro - Monthly7 Days trial$5.991 Month
  • Sonar Pro - Annual (Legacy)7 Days trial$49.991 Year
Show 1 more
  • Sonar Pro - Annual7 Days trial$49.991 Year
One-time3
  • Sonar Pro - Lifetime$199.99
  • Sonar Pro - Lifetime$249.99
  • Sonar Pro - Lifetime$299.99
3 purchases

Arc Timeline 4

Subscriptions2
  • Monthly Subscription7 Days trial$4.991 Month
  • Yearly Subscription7 Days trial$44.991 Year
One-time1
  • Lifetime Purchase$179.99

Questions

Is Sonar free?
Sonar is free to download, with in-app purchases available.
Is Arc Timeline 4 free?
Arc Timeline 4 is free to download, with in-app purchases available.
Which has better reviews, Sonar or Arc Timeline 4?
Sonar is rated higher. Sonar averages 4.6 out of 5 from 335 ratings, while Arc Timeline 4 averages 3.9 from 23 ratings.
Do Sonar or Arc Timeline 4 have ads?
Neither Sonar nor Arc Timeline 4 shows ads.
Which is updated more often, Sonar or Arc Timeline 4?
Sonar ships an update weekly, and Arc Timeline 4 weekly. Most recently, Sonar was updated on September 26, 2026 and Arc Timeline 4 on September 27, 2026.

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