Comparison

Saturday vs Subintervals

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

Head to head
About

Saturday

This app provides personalized fueling and hydration plans for endurance athletes. It uses science-based recommendations tailored to your training and environment, eliminating guesswork and expensive coaching. Achieve your best performance with confidence.

Highlights
  • Personalized fuel and hydration plans
  • Science-based recommendations
  • Tailored to training and environment
  • Eliminates guesswork
  • Reduces reliance on coaching
Features
Read full description

Saturday is personal fueling for runners, cyclists and triathletes, built by a board-certified sports dietitian and a PhD sport scientist, both former Team USA athletes. Tell it about your training session or race, and it plans what to drink and eat each hour from how much you sweat and the weather, then turns that plan into drinks you mix yourself or the gels and drink mixes you use. "Saturday has been incredible both with taking the guess work out of fueling and improving my workouts... definitely recommend!" - Dan Laurich, Triathlete "My half marathon was AMAZING! 7-minute PR! The fuel was great. Everything just clicked. Big confidence boost. I feel ready to get back to my training tomorrow. I’m happy!" - Kasie P., Runner "If you want to get out of the black box of mid ride/race nutrition needs, Saturday is the app for you!" - Skip Kastroll - XC & Enduro MTB racer "I’ve trusted Saturday for everything. From hot laps with the guys to ultra endurance gravel races." - Tarah Romano, Cyclist "I hate training without it." - Michelle Howe, professional triathlete Saturday makes elite endurance nutrition accessible and easy so you can be confident and relaxed in training and on race day. Saturday is designed to deliver the best training session of your life. Gone are the days of shelling out hundreds on hydration products that are just wild guesses or some corporate-influenced industry "standard." You deserve better. Better science. Better individualization. Optimized fuel & hydration tailored to you, your training, and your environment, Saturday will revolutionize your endurance experience. No more paying premium prices for private nutrition coaching, just to have confidence in your fuel & hydration plan. We should all be able to fuel the sports we love. Our science. Your joy. Taking you farther. End User License Agreement (EULA): https://saturday.fit/app-terms Privacy policy: https://saturday.fit/app-privacy

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.

Screenshots

Saturday4 screens
Subintervals4 screens

Verdict

The call

The clearest difference is ratings volume: Saturday at 155 against Subintervals's 2. On price, rating, review sentiment and update cadence 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. Saturday sells 2 in-app purchases, starting at $5.99 per month and Subintervals sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Saturday against 5.0 for Subintervals. That said, the two scores are not equally well evidenced: Saturday has 155 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 97% of Saturday's written reviews are positive against 100% of Subintervals's.

UpkeepUpdate frequency

Saturday ships an update every 11 days, Subintervals weekly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

Scorecard1 real difference · 9 level
Saturday versus Subintervals: the parameters behind the verdict, then further details
ParameterSaturdaySubintervals
PriceFreeFree
Rating5.0 (155 ratings)5.0 (2 ratings) — better
Positive reviews97.3% of reviews100.0% of reviews — better
Number of ratings155 — better2
Update frequencyEvery 11 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS17.016.4 — better
Further details — not scored
Size152 MB109 MB
Age rating+124+
DeveloperSaturday Morning LLCInaki Arroyo Nebreda

Customer experience

Saturday

All ratings155 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews75 reviews
Positive97.3%
Neutral1.3%
Negative1.3%

Subintervals

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Saturday

Reported bugs

2 issues
  • Login experience issues
  • Swim hydration recommendations causing excessive bathroom breaks for some users

Requested features

5 requests
  • Per-bottle recipe breakdown instead of bulk mixing calculations
  • Recovery advice and prescriptions
  • Native mobile application instead of web app
  • More granular ingredient customization options
  • Improved swim-specific hydration recommendations

Subintervals

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Saturday

Subscriptions2
  • 1-month subscription$5.991 Month
  • 1-year subscription1 Month trial$49.991 Year
4 purchases

Subintervals

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

Questions

Is Saturday free?
Saturday is free to download, with in-app purchases available.
Is Subintervals free?
Subintervals is free to download, with in-app purchases available.
Which has better reviews, Saturday or Subintervals?
Subintervals is rated higher. Saturday averages 5.0 out of 5 from 155 ratings, while Subintervals averages 5.0 from 2 ratings.
Do Saturday or Subintervals have ads?
Neither Saturday nor Subintervals shows ads.
Which is updated more often, Saturday or Subintervals?
Saturday ships an update every 11 days, and Subintervals weekly. Most recently, Saturday was updated on October 27, 2026 and Subintervals on October 24, 2026.

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