OnAux vs Flex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- AI-powered music curation
- DJ-style transitions
- Plays best song segments
- Vibe selection
- Seamless party flow
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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.
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.
- Plex Media Server integration
- Offline music downloads
- Customizable playback queue
- Theming and visualizers
- Smart playlist management
- Lyrics and artwork display
- CarPlay and Siri integration
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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
Verdict
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
Both are free to download. Flex sells 3 in-app purchases, starting at $0.99 per month. OnAux asks for nothing beyond the download.
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.
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.
| Parameter | OnAux | Flex |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | 1 |
| Update frequency | Every 3 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 16.4 — better | 18.0 |
| Further details — not scored | ||
| Size | 28 MB | 132 MB |
| Age rating | 17+ | 4+ |
| Developer | Sachin Katyal | Elixir CS |
Customer experience
OnAux
Flex
In-app purchases
OnAux
No in-app purchases
Flex
- Flex Music Pro Monthly$0.991 Month
- Flex Music Pro Yearly$9.991 Year
- Flex Music Pro Lifetime$19.99









