Comparison

Retro Flex vs ONYX Coaching

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

Head to head

About

Retro Flex

Features

Read full description

Welcome to the official app for retro flex gym, where you can sign into club, access workouts & much more!

About

ONYX Coaching

Features

Read full description

Onyx Coaching is a health & fitness based business which provides nutrition, workout & 1-1 coaching programs to help clients achieve their personal goals. This is the number 1 transformation platform for self improvement! There is no need for confusion when it comes to accomplishing your goals. Join the team and become the best version of yourself, through the power of our health & fitness strategies! * App access requires paid coaching plan Terms of use: https://kahunas.io/terms-conditions Privacy policy: https://kahunas.io/privacy

Screenshots

Retro Flex4 screens

ONYX Coaching3 screens

Verdict

The call

The clearest difference is in-app purchases: Retro Flex at none against ONYX Coaching's 1. 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. ONYX Coaching sells 1 in-app purchase, starting at $100.00 per month. Retro Flex asks for nothing beyond the download.

UpkeepUpdate frequency

Retro Flex ships an update every 6 weeks, ONYX Coaching every 2 months. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

Scorecard1 real difference · 5 level

Retro Flex versus ONYX Coaching: the parameters behind the verdict, then further details
Parameter	Retro Flex	ONYX Coaching
Price	Free	Free
Update frequency	Every 6 weeks — better	Every 2 months
Ads	No	No
In-app purchases	No — better	Yes
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	15.1	15.0 — better
Further details — not scored
Size	40 MB	46 MB
Age rating	17+	17+
Developer	Fit Cloud Technology Limited	DANIEL JOHN MALPASS

In-app purchases

None

Retro Flex

No in-app purchases

1 purchases

ONYX Coaching

Subscriptions1

Monthly Coaching$100.001 Month

Questions

Is Retro Flex free?

Retro Flex is free to download, with no in-app purchases.

Is ONYX Coaching free?

ONYX Coaching is free to download, with in-app purchases available.

Do Retro Flex or ONYX Coaching have ads?

Neither Retro Flex nor ONYX Coaching shows ads.

Which is updated more often, Retro Flex or ONYX Coaching?

Retro Flex ships an update every 6 weeks, and ONYX Coaching every 2 months. Most recently, Retro Flex was updated on October 13, 2026 and ONYX Coaching on October 2, 2026.