System Designer vs MP3 a OGG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
System Designer
Design complex systems using a low-code platform that leverages UML standards. Generate code skeletons and manage components graphically. Run and test your system with dynamic type checking.
- UML-based system modeling
- Code skeleton generation
- Graphical component creation
- MSON format for model definition
- Dynamic type checking
- Cross-device synchronization via GitHub
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System Designer is a low-code development platform for creating systems. No matter the frameworks you use and the code you write, the most important is the model that you define to create your system. System Designer helps you to design this model and to generate the classes and components to build your system. DESIGN YOUR SYSTEM WITH EASE If you look at the different JavaScript frameworks on the market, you will notice that they all have their own way to define a model, generally only with code. System Designer uses UML, a standard, to define your model. So you probably already know how to design in System Designer even if you have never run it. The definition of the model is stored on a JSON format called MSON. With MSON you can define types, classes, one to one / one to many relationships and multi inheritance between classes. CODE THE BEHAVIOR OF YOUR SYSTEM Once you have created your model, System Designer generates the skeletons of all your methods. You only have then to add your code to implement them. System Designer provides you helpers to manage your components. You can easily navigate threw your components to create your application. CREATE COMPONENTS GRAPHICALLY There is no need to code to instantiate a component. Create a component in System Designer is like creating a document in a NoSQL Database. In fact, System Designer acts as an ODM (Object-Document Mapper) to manage your components as NoSQL Documents. RUN YOUR SYSTEM You can run your system directly from System Designer. Because you have defined a model for your application, a Dynamic Type Check is done on every action of your system. All warnings are send and shown in System Designer. DESIGN ON THE GO System Designer can be used on macOS, iPad or any browsers. System Designer has a Github module to synchronize your work between all these apps. You can begin your design on your Mac and then continue it on your iPad.
MP3 a OGG
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Convert MP3 files to Ogg Vorbis directly on your iPhone or iPad. Audio is processed on your device: nothing is uploaded to a server, and no account or internet connection is required. MP3 to OGG combines a focused converter with editing and encoding controls, so you can prepare each file before saving it. OGG CONVERSION UNDER CONTROL • Choose VBR from q−1 to q10, or ABR/CBR from 32 to 320 kbps. • Preserve the original sample rate or select a value from 8 to 48 kHz. • Keep the source channels or convert to mono or stereo. • Use Compact, Balanced, High and Very High presets, or save custom presets. • Check an estimated output size before you begin. EDIT BEFORE YOU CONVERT • Trim audio with a waveform and start/end handles. • Apply fade-in and fade-out. • Adjust gain and normalize the peak to −1 dBFS. • Get a warning when your settings may cause clipping. METADATA YOUR WAY Preserve or edit title, artist, album, genre, track number, date and comment. You can also add, replace or remove cover artwork. OUTPUTS READY TO USE The app validates each generated Ogg file before publishing it. You can then listen to it, save it to Files, share it, open it or rename it without overwriting another file. History groups conversions by date and lets you search by name, play outputs, repeat a conversion with the same settings, or remove records and files. Naming templates using {name}, {index}, {date} and {quality} help keep outputs consistent. Built for podcasts, game development and audio workflows that use Ogg Vorbis. Straightforward privacy: no accounts, no uploads and no tracking. The interface is available in English and Spanish, with light, dark and system themes. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.freeprivacypolicy.com/live/6709a492-0082-4d37-b246-397c3cdc06a5
Screenshots
Verdict
The clearest difference is iOS requirement: System Designer at 15.6 against MP3 a OGG's 17.0. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | System Designer | MP3 a OGG |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (17 ratings) — better | — |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 17 — better | — |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Erwan Carriou | Antonio Gonzalez de la aleja german |
In-app purchases
System Designer
No in-app purchases
MP3 a OGG
No in-app purchases









