Comparison

KY vs S55

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

Head to head
About

KY

Access live and on-demand guided workouts, personalized training, and nutrition plans. Learn proper technique with video demonstrations and enjoy extra classes for flexibility and mobility, all designed to fit your fitness goals and schedule.

Highlights
  • Live guided workouts
  • Personalized training plans
  • Nutrition plans
  • Technique video tutorials
  • On-demand extra classes
  • Mobility and stretching sessions
Features
Read full description

A professional team of coaches and nutrition experts working together to create structured training and nutrition plans tailored to your goals, fitness level, and needs. Whatever your objective, we have a plan for you. Access a complete training platform with Strength, HIIT, Endurance, Pilates, Strength for Runners, Mobility, 30-Minute Full Body, and Extra Strength sessions, all designed to help you train consistently and make progress. Improve your technique with our exercise and movement videos, created to help you learn, practice, and master each movement. Adapt every exercise to your fitness level and train with confidence, control, and precision. We take care of the planning. You focus on showing up, training consistently, and progressing. Our goal is to create the best training plan for you. To access all features and content you can subscribe to KY-FIT.LIVE on a monthly or yearly basis with an auto-renewing subscription right inside the app.* Pricing can vary by region and will be confirmed before purchase in the app. In app subscriptions will automatically renew at the end of their cycle. * All payments will be paid through your iTunes Account and may be managed under Account Settings after the initial payment. Subscription payments will automatically renew unless deactivated at least 24-hours before the end of the current cycle. Your account will be charged for renewal at least 24-hours prior to the end of the current cycle. Any unused portion of your free trial will be forfeited upon payment. Cancellations are incurred by disabling auto-renewal. Terms of Service: https://www.ky-fit.live/tos Privacy Policy: https://www.ky-fit.live/privacy

About

S55

Features
Read full description

Descarga la app S55 para reservar clases fácilmente y gestionar tu perfil. Reserva tu plaza o añádete a la lista de espera. Mantente al tanto de las últimas novedades y recibe notificaciones push con mensajes importantes.

Screenshots

KY4 screens
S554 screens

Verdict

The call

The clearest difference is in-app purchases: S55 at none against KY's 2. On price, update cadence, 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. KY sells 2 in-app purchases, starting at $18.99 per month. S55 asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 3, 2026 and October 14, 2026 respectively.

Scorecard1 real difference · 9 level
KY versus S55: the parameters behind the verdict, then further details
ParameterKYS55
PriceFreeFree
Rating5.0 (8 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings8 — better—
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple TV — betteriPhone, iPod
Requires iOS16.615.0 — better
Further details — not scored
Size101 MB16 MB
Age rating4+4+
DeveloperKY-FIT SPORT AND FITNESS S.L.Trainin B.V.

In-app purchases

2 purchases

KY

Subscriptions2
  • KY-FIT.LIVE Monthly$18.991 Month
  • KY-FIT.LIVE Yearly$185.991 Year
None

S55

No in-app purchases

Questions

Is KY free?
KY is free to download, with in-app purchases available.
Is S55 free?
S55 is free to download, with no in-app purchases.
Do KY or S55 have ads?
Neither KY nor S55 shows ads.
Which is updated more often, KY or S55?
KY ships an update every 3 months, and S55 every 3 months. Most recently, KY was updated on November 3, 2026 and S55 on October 14, 2026.

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