Comparison

ROTOR Power vs Aster

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

Head to head
About

ROTOR Power

This app helps cyclists optimize their performance by updating power meter firmware, checking device battery, and analyzing pedaling biomechanics. It provides real-time training data, workout history, and syncs with popular third-party fitness platforms.

Highlights
  • Firmware updates
  • Device battery check
  • Pedaling biomechanics analysis (TORQUE 360, OCA, OCP)
  • Real-time power and cadence metrics
  • Workout history and .fit export
  • Bluetooth connectivity
  • Third-party app syncing (Strava, Training Peaks)
Features
Read full description

ROTOR Power is the ideal tool to keep your power meter updated and to improve your pedaling biomechanics thanks to TORQUE 360, OCA, OCP and many more. What do we offer you? - Update the firmware when a new version is available. - Check your device battery and calibrate your ROTOR device easily step by step. - Check your OCA (Optimum Chainring Angle) and your OCP (Optimum Chainring Position) for Q Rings on your iOS devices thanks to TORQUE 360. Download the data of TORQUE 360 graph as CSV file to analyze your results. - Metrics like power or cadence could be used when you ride to improve your training sessions. - Real-time data on your sessions as every GPS device. - A history of all your workouts. Download the summaries of these workouts in .fit format and check the data with your favorite training program. - Improved connectivity via Bluetooth which means a faster pairing of your sensors and the app. - Sync your activities with third-party applications such as Strava or Training Peaks.

About

Aster

Features
Read full description

Any ride or run, live on the map Aster makes every ride, run and event watchable live from the phone in your pocket, so the people who care follow you the whole way to the finish. Enter an event and the whole field goes live. Build the club ride in minutes and one link gets everyone in, the whole group live on one map. Mark a spot that means something to your club, the town sign, the climb, the café, and afterwards the recap shows who got there first and by how much. EVERYONE LIVE Enter an event and the whole field goes live. Everyone in it, and you know exactly where you stand, from the phone in your pocket, no tracker to carry, nothing to hire. • The whole field on one map: positions, gaps, the chase • Know exactly where you stand as it changes • Anyone watches on one link. No app, no sign-up • Your phone lasts the whole way. No hardware to hire CLUBS MADE EASY Build the ride in minutes and one link gets the whole club in. The group rides live on one map, and the recap afterwards gives everyone their moment and a reason to line up for the next one. • Build a ride in minutes: drop in a route and share it • Know who's coming, and who's already rolling • The whole group, live on one map • Mark a Milestone on the route, and afterwards the recap shows who reached it first, and by how much SHARE IT ALL You're never out there on your own. Send one link, and the people who matter are with you through the long hours and there when you finish. • They know where to be: roadside to cheer, or watching for the finish • They see you cross the line, live, at the side of the course or watching your broadcast on their phone • You get the story to send on: after the finish, the day becomes a share card of the route, the numbers and the moments, ready for the group chat and the feed Aster - Go. Live. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://astertrack.app/privacy

Screenshots

ROTOR Power4 screens
Aster4 screens

Verdict

The call

The clearest difference is in-app purchases: ROTOR Power at none against Aster's 5. ROTOR Power also leads on iOS requirement (13.0 vs 15.0). Aster's advantage is update cadence (every 3 weeks vs every 5 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. Aster sells 5 in-app purchases, starting at $2.99 per month. ROTOR Power asks for nothing beyond the download.

UpkeepUpdate frequency

ROTOR Power ships an update every 5 months, Aster every 3 weeks. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

Scorecard3 real differences · 5 level
ROTOR Power versus Aster: the parameters behind the verdict, then further details
ParameterROTOR PowerAster
PriceFreeFree
Positive reviews9.1% of reviews—
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size31 MB17 MB
Age rating4+12+
DeveloperROTOR Bike ComponentsJames Vickers

In-app purchases

None

ROTOR Power

No in-app purchases

5 purchases

Aster

Subscriptions5
  • Aster Plus - Monthly$2.991 Month
  • Aster Plus - Annual$24.991 Year
  • Aster Organiser 100 - Monthly$79.991 Month
Show 2 more
  • Aster Organiser 500 - Monthly$149.991 Month
  • Aster Organiser 1000 - Monthly$199.991 Month

Questions

Is ROTOR Power free?
ROTOR Power is free to download, with no in-app purchases.
Is Aster free?
Aster is free to download, with in-app purchases available.
Do ROTOR Power or Aster have ads?
Neither ROTOR Power nor Aster shows ads.
Which is updated more often, ROTOR Power or Aster?
ROTOR Power ships an update every 5 months, and Aster every 3 weeks. Most recently, ROTOR Power was updated on November 2, 2026 and Aster on November 5, 2026.

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