The Oppo R1x comes with a proprietary web browser, which has an address bar on top and a navigation bar on the bottom always visible when you scroll. There's a fullscreen mode, though, which hides both and replaces them with a single menu button that makes them reappear when desired.
Another handy feature is Night mode, which re-renders web pages so that black-on-white texts are displayed as light gray-on-darker gray to make it easier on the eyes in darker environments.
Google Chrome is also on board with all the familiar features, we've come to like and take for granted like seamless integration with its desktop counterpart, data saver, extensive settings and overall uncluttered interface.
Perhaps the highlight of Oppo's homebrewed apps is the Security Center app. It lets you control all sorts of features from call/message privacy and Quiet Time settings, to phone optimization and app permissions, app encryption, to network and battery usage. The phone's Guest Mode is also activated from within this app.
The Oppo R1x comes with Kingsoft Office preinstalled. It's a pretty powerful office editor that can handle Word docs, PDFs, Spreadsheets and Presentations. It can link to cloud storage, email files, and create a shared view with other users and more. There's editing enabled, too, so you can get some work done on the go, though it's not the most productive experience on this diagonal.
The calendar app has three views that you can swipe between. First is the Year view, which aggregates all 12 months with all of their days, a month view, which has little red dots for events and the agenda view, which is a vertically scrollable grid of events.
The clock app supports multiple alarms, each with its own repeat time, ring tone, volume, snooze interval and note. The app also offers a world clock, a stop watch and a timer.
The Tools folder is preloaded with a few apps that you usually get from the market. There's a Flashlight app, a sound recorder and a 3D compass. A calculator app is also on board.
The phone comes with a capable file manager out of the box. Its interface is laid out over two tabs, the first one organizes files by category, while the second is a traditional folder browser.
Files and folders can be copied, moved, deleted, renamed and compressed to ZIP (and ZIP files can be extracted). Batch operations are supported. The folder browser has list and grid views and you can change the sorting method. The system can be encrypted and password protected too.
The file browser also has built in DLNA and FTP server support, which makes it easy to access multimedia and general files on another device.