Comparison

Subintervals vs Musette Fuel

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

Head to head
About

Subintervals

Visualize your training data with detailed displays and interactive graphs. Customize your analysis and sync seamlessly with intervals.icu for up-to-the-minute insights into activities, events, and performance metrics.

Highlights
  • Detailed activity and event visualization
  • Interactive performance graphs
  • Seamless intervals.icu sync
  • Customizable data analysis
  • Actionable training insights
Features
Read full description

Elevate Your Training with Subintervals Subintervals transforms your intervals.icu data into actionable insights. This app brings your training activities, events, and performance metrics to life through detailed displays and interactive graphs. Customise and control your data for a tailored analysis, and seamlessly sync with intervals.icu for up-to-the-minute information. Key Features: - Detailed visualisation of activities and events. - Dynamic, interactive graphs for performance tracking. - Effortless sync with intervals.icu. Please note that it is an independent application developed by an enthusiast keen on providing a complementary tool to the official platform.

About

Musette Fuel

Features
Read full description

Musette Fuel turns "eat something on the bike" into a number you can act on. Tell it the session you are doing and it gives you carbs per hour, fluid and sodium — scaled to your body mass, the temperature, and the gut tolerance you have actually trained. No guesswork, no generic 60 g/hr for everybody. FIVE SESSION TIERS Recovery, intensity, endurance, long ride and race day each get their own fuelling target. An easy spin is not a four-hour road race, and the plan says so. RACE-DAY BUILDER The flagship. Enter your race duration, expected temperature, how many bottles you carry and what is in them, and Musette Fuel solves the whole day: • Exact grams of drink mix per bottle, with a warning if the mix gets too concentrated to empty from your stomach • How many gels or chews you need, and whether they fit in your pockets • An hour-by-hour ledger so nothing is back-loaded into the final hour • A countdown timeline from breakfast to the finish, including caffeine timing • A shopping list with spares • A printable top-tube card you can share straight to the iOS share sheet, save to Files, or print and tape to your bike GUT TRAINING THAT PROGRESSES Carb intake is limited by absorption, not by your power or your size. Log what you took and how your stomach felt, and the app tracks your trained ceiling over time — then plans from that real number rather than an ambitious one. PRODUCT LIBRARY 40+ gels, drink mixes, chews, bars, electrolyte tabs and real-food options with carbs, sodium and caffeine per serving. Add your own products too. MUSETTE CONNECTED — OPTIONAL SUBSCRIPTION Everything above is free. Musette Connected adds the features that rely on live services: • Route forecast: import a GPX, TCX or FIT route and the forecast along it sets your temperature • intervals.icu sync: planned workouts arrive pre-tiered, with carbs per hour written back to your calendar • Ride log: check in after each ride and watch 28-day trends build up • Cloud sync across your devices £1.99 a month or £14.99 a year, with a 14-day free trial for new subscribers. Prices may vary by country. Payment is charged to your Apple Account when you confirm the purchase (or when the free trial ends). The subscription renews automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel any time in your Apple Account settings. Bought Musette Fuel before it went free? Every Musette Connected feature is included for you, for life. BUILT FOR HOW YOU ACTUALLY RIDE • Works fully offline — the maths runs on your device • No account required. Use it as a guest, or add one (sync across devices is part of Musette Connected) • No ads, no third-party trackers, no data selling • iPhone and iPad • Dark and light themes Musette Fuel gives general sports-nutrition guidance, not medical advice. Consult a qualified professional for any medical condition, including diabetes, pregnancy, or a history of disordered eating. It is a planning tool — you are responsible for how you fuel and hydrate on the bike. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://musettefuel.com/#/privacy

Screenshots

Subintervals4 screens
Musette Fuel4 screens

Verdict

The call

The clearest difference is update cadence: Subintervals at weekly against Musette Fuel's fortnightly. On price, ads, in-app purchases 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. Subintervals sells 4 one-off in-app purchases and Musette Fuel sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Subintervals ships an update weekly, Musette Fuel fortnightly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

Scorecard1 real difference · 9 level
Subintervals versus Musette Fuel: the parameters behind the verdict, then further details
ParameterSubintervalsMusette Fuel
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyWeekly — betterFortnightly
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.415.0 — better
Further details — not scored
Size109 MB11 MB
Age rating4+4+
DeveloperInaki Arroyo NebredaCeri Pritchard

In-app purchases

4 purchases

Subintervals

One-time4
  • Coffee$3.99
  • Lunch$11.99
  • Big Thanks$17.99
Show 1 more
  • Sponsor$44.99
2 purchases

Musette Fuel

Subscriptions2
  • Musette Connected Monthly14 Days trial$1.991 Month
  • Musette Connected Annual14 Days trial$14.991 Year

Questions

Is Subintervals free?
Subintervals is free to download, with in-app purchases available.
Is Musette Fuel free?
Musette Fuel is free to download, with in-app purchases available.
Do Subintervals or Musette Fuel have ads?
Neither Subintervals nor Musette Fuel shows ads.
Which is updated more often, Subintervals or Musette Fuel?
Subintervals ships an update weekly, and Musette Fuel fortnightly. Most recently, Subintervals was updated on November 4, 2026 and Musette Fuel on October 31, 2026.

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