Comparison

OnAux vs Flex

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

Head to head
About

OnAux

This app acts as an AI DJ for your events, curating music based on your chosen vibes. It seamlessly blends tracks, plays only the best parts of songs, and ensures a continuous flow for your party.

Highlights
  • AI-powered music curation
  • DJ-style transitions
  • Plays best song segments
  • Vibe selection
  • Seamless party flow
Features
Read full description

OnAux DJs your party or event. Just select your vibes and OnAux handles the rest, curating the perfect set of tracks, creating DJ-style transitions, and playing only the best parts of each song to keep your party flowing seamlessly.

About

Flex

This app allows you to manage and play your personal music library hosted on a Plex Media Server. Enjoy offline playback, customize your queue, and personalize your listening experience with various themes and visualizers.

Highlights
  • Plex Media Server integration
  • Offline music downloads
  • Customizable playback queue
  • Theming and visualizers
  • Smart playlist management
  • Lyrics and artwork display
  • CarPlay and Siri integration
Features
Read full description

Your music library should feel like yours. Flex Music is an independent music player and playlist manager for personal Plex Media Server libraries. Sign in with Plex, choose your server and enjoy your music at home, remotely or offline. BROWSE AND PLAY Explore artists, albums, tracks, playlists, genres and moods. Search inside large playlists, rate tracks back to Plex, and keep browsing while the mini-player plays. Expand Now Playing for artwork, synced lyrics when available, visualizers and the waveform progress bar. YOUR QUEUE, YOUR WAY Use Play Next to put a track first, or Play After Next to add it after your manually queued tracks. Assign these actions to your playlist swipes. Manage Up Next and Previously Played, reorder playlists, add whole albums and clone playlists. OFFLINE AND DATA SAVER Download your music with no paid track limit. Choose storage limits and keep favourites offline. Data saver asks your Plex server to convert audio to your chosen bitrate, with separate Wi-Fi and cellular preferences and measured transferred-data totals. Conversion depends on your server; data saved is compared with the original media size. MADE FOR YOUR SCREEN Choose themes, artwork effects and visualizers. Larger displays have room for the player and queue side by side. iPhone Duo adapts from a compact cover-screen player to a stacked portrait layout and a side-by-side player and queue when opened in landscape. Controls stay clear of the system strip, and your player and queue are retained as the layout changes. Music casting is free on supported receivers. Lyric casting brings available lyrics to Google Cast displays with Flex Music Pro. FLEX MUSIC PRO Free: browsing, playback, Smart Search, ratings, on-device lyrics, music casting, themes and visualizers, offline downloads, the Pinned Playlist widget, and editing playlists up to 100 tracks. Pro unlocks editing larger playlists, saving smart playlists and listening sessions, premium home-screen widgets, alternate app icons, navigation icon themes and styles, and lyric casting. The Apple Watch companion is also included with Pro. CarPlay and Siri playlist playback are free. Monthly, yearly and lifetime plans unlock the same Pro features. Purchases are processed by the App Store and can be restored from Settings. Lifetime is a one-time purchase; subscriptions renew until cancelled in your store account settings. REQUIREMENTS A Plex account and access to a Plex Media Server containing a music library. Network access to that server is required for streaming and library management. Flex Music is independently developed by Elixir Consultancy Services Ltd and is not affiliated with or endorsed by Plex, Inc. Plex is a trademark of Plex, Inc. Google Cast is a trademark of Google LLC. Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

OnAux3 screens
Flex4 screens

Verdict

The call

The clearest difference is in-app purchases: OnAux at none against Flex's 3. OnAux also leads on update cadence (every 3 days vs every 2 months) and ratings volume (8 vs 1). On price, rating, 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. Flex sells 3 in-app purchases, starting at $0.99 per month. OnAux asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for OnAux against 5.0 for Flex. That said, the two scores are not equally well evidenced: OnAux has 8 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

OnAux ships an update every 3 days, Flex every 2 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
OnAux versus Flex: the parameters behind the verdict, then further details
ParameterOnAuxFlex
PriceFreeFree
Rating5.0 (8 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings8 — better1
Update frequencyEvery 3 days — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS16.4 — better18.0
Further details — not scored
Size28 MB132 MB
Age rating17+4+
DeveloperSachin KatyalElixir CS

Customer experience

OnAux

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Flex

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

OnAux

No in-app purchases

3 purchases

Flex

Subscriptions2
  • Flex Music Pro Monthly$0.991 Month
  • Flex Music Pro Yearly$9.991 Year
One-time1
  • Flex Music Pro Lifetime$19.99

Questions

Is OnAux free?
OnAux is free to download, with no in-app purchases.
Is Flex free?
Flex is free to download, with in-app purchases available.
Which has better reviews, OnAux or Flex?
OnAux and Flex are both rated 5.0 out of 5 on the App Store, from 8 and 1 ratings respectively.
Do OnAux or Flex have ads?
Neither OnAux nor Flex shows ads.
Which is updated more often, OnAux or Flex?
OnAux ships an update every 3 days, and Flex every 2 months. Most recently, OnAux was updated on November 5, 2026 and Flex on October 31, 2026.

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