Comparison

Selfloops Spark vs Circular45

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

Head to head
About

Selfloops Spark

This app helps athletes and fitness enthusiasts track, analyze, and optimize their workouts. It offers personalized training plans, goal setting, and performance insights. Connect with coaches and other users for motivation and feedback.

Highlights
  • Workout tracking and analysis
  • Fitness challenges and goal setting
  • Personalized training plans
  • Heart rate monitoring
  • RPE logging
  • Data syncing with Apple Health
  • Advanced performance analytics
Features
Read full description

Take Your Sports Performance to the Next Level with SELFLOOPS SELFLOOPS is an advanced fitness and sports performance tracking app for Apple Watch and iPhone, designed for athletes, coaches, and fitness enthusiasts who want deeper insights into their training. Track, Analyze, and Optimize Your Workouts The iPhone app allows you to: - View and analyze your workouts from SELFLOOPS.COM - Join fitness challenges to stay motivated - Set and track weekly fitness goals - Sign up for group fitness classes - Follow personalized training plans created by your coach - Add workout notes and see feedback from your coach - Log your Rate of Perceived Exertion (RPE) to better understand your effort levels The Apple Watch app enables you to: - Use your Apple Watch as a heart rate monitor for SELFLOOPS Group Fitness classes - Track cardio workouts with real-time heart rate data - Monitor workouts on Concept2 rowers, BikeErgs, and SkiErgs - Connect to indoor rowers, treadmills, bikes, and trainers supporting Bluetooth FTMS, Cycling Power, and Speed & Cadence standards Seamless Data Syncing All your workouts automatically sync with Apple Health, Apple Activity, and the SELFLOOPS website, ensuring your training data is always up to date. Unlock Advanced Performance Insights with Athlete Premium Upgrade to Athlete Premium to access powerful sports performance analytics and connect to top third-party platforms, including Garmin, Wahoo Fitness, Polar, Withings, and Concept2. With Athlete Premium, you can also: - Export Apple Health data like sleep, steps, resting heart rate, HRV, and more to SELFLOOPS for deeper analysis - Get access to exclusive tools for elite-level performance tracking Ready to Elevate Your Training? Download SELFLOOPS today and start training smarter! Terms of Service: https://www.selfloops.com/tos.html

About

Circular45

Features
Read full description

Somos un estudio de entrenamiento funcional dedicado a impulsarte hacia tus metas de fitness con programas diseñados para desafiar, motivar y transformar.

Screenshots

Selfloops Spark4 screens
Circular454 screens

Verdict

The call

The clearest difference is in-app purchases: Circular45 at none against Selfloops Spark's 1. Circular45 also leads on iOS requirement (15.0 vs 18.0). Selfloops Spark's advantage is update cadence (every 2 weeks vs every 8 months). 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. Selfloops Spark sells 1 in-app purchase, starting at $69.99 per year. Circular45 asks for nothing beyond the download.

UpkeepUpdate frequency

Selfloops Spark ships an update every 2 weeks, Circular45 every 8 months. The most recent releases landed on October 8, 2026 and October 4, 2026 respectively.

Scorecard3 real differences · 7 level
Selfloops Spark versus Circular45: the parameters behind the verdict, then further details
ParameterSelfloops SparkCircular45
PriceFreeFree
Rating2.7 (13 ratings) — better—
Positive reviews25.9% of reviews—
Number of ratings13 — better—
Update frequencyEvery 2 weeks — betterEvery 8 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, Apple WatchiPhone, iPod
Requires iOS18.015.0 — better
Further details — not scored
Size44 MB26 MB
Age rating17+4+
DeveloperSelfLoopsFernando Quintana

In-app purchases

1 purchases

Selfloops Spark

Subscriptions1
  • Athlete Premium$69.991 Year
None

Circular45

No in-app purchases

Questions

Is Selfloops Spark free?
Selfloops Spark is free to download, with in-app purchases available.
Is Circular45 free?
Circular45 is free to download, with no in-app purchases.
Do Selfloops Spark or Circular45 have ads?
Neither Selfloops Spark nor Circular45 shows ads.
Which is updated more often, Selfloops Spark or Circular45?
Selfloops Spark ships an update every 2 weeks, and Circular45 every 8 months. Most recently, Selfloops Spark was updated on October 8, 2026 and Circular45 on October 4, 2026.

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