CSIX Series is a collection of ReaperThemes with a consistent appearance and a range of features, intended to improve both user experience and workflows.

CSIX supports multi-monitor awareness and is suitable for Retina, 4K as well as 1920/1080p displays using the themes at 100% or 200%

CSIX is a further development based on the dynamic/responsive default 6 theme included with REAPER 7.

CSIX is divided into four different theme series, with variants in each of the series having a common basic structure or a similar look and feel.

Read more about the CSIX Series below, or jump to the download section at the bottom of the page.


BC Series          MC Series

DM Series         AE Series (new)

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BC Series (Basic Color)

Themes in the BC Series is able to display a basic colored background for all non-selected tracks, and with clear highlighting of custom colors when tracks are selected. The concept was originally created to offer themes that have an overall calm and subdued appearance, which can be preferable if you spend a lot of time with REAPER.

Furthermore, from the Theme Adjuster in version 3, there’s now a cool option for adding custom color overlay to the panels, or to mix the appearance of predefined basic colors with custom colors. Due to the flexibility of using custom overlays in REAPER 7, this feature actually makes the BC themes more of a hybrid kind, check it out!

There are three themes in the BC Series: BC Extended, BC Narrow Extended and BC PimpedUp! In addition to the full featured BC Themes, there are two BASIC Editions. These are lighter versions that take up less space, load a little faster and don’t necessarily require as much screen width. In the BASIC Editions, some features and layouts are omitted, but basically they work in the same way.

All theme variants are continuously updated to ensure they work best possible with the latest features in REAPER. There’s also a customized CSIX Theme Adjuster that pairs exclusively with the CSIX Series. It can be used to control and recall specific settings for each theme variant and has a number of useful functions, including an extended color section with distinctive palettes and associated actions.

The theme-check function in REAPER makes it possible to use CSIX as a highly dynamic interface. With the Theme Adjuster you can set rules for A-, B- and C-formatted layouts, and automatically preserve layouts when switching between the theme variants. Keep in mind, settings will always load per theme, and if you have chosen to show specific UI elements in one theme, the same elements could be hidden when switching to another.

CSIX was originally developed for high resolution displays. Many elements are designed with delicate details in mind, and fully justified when displayed in high density. In addition, all variants now include resources for standard resolution, to be used also with smaller or even mixed screen sizes.

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MC Series (Multi Color)

MC Series has a more pronounced, perhaps traditional way of showing track colors, and some elements have a stronger presence to ensure visual balance. Preferences can also be set so that REAPER draws contoured ‘peak edges’ on the displayed waveforms.

All elements in the MC series are completely color streamlined, including the heavily modified V5 channel strips, and a full set of color-matching Toolbar Icons (500+), that will automatically change and correspond to the active theme variant. Furthermore, the MC Series include alternate colors for volume controls, even for the master mixer.

It is important to note that the MC series is specifically designed to use with the Color Control feature in REAPER. By having theme variants in both bright and dark tone, it is possible to fit CSIX into different lighting environments, still preserving a natural appearance.

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DM Series (Dark Mode)

CSIX DM Series is especially suited for dark inverted system appearances, however the included themes works fine also for normal mode. The background of the arrangement is toned down, allowing media items and automation to stand out bright and clear. All themes in the DM Series include additional variants displaying bright inverted colors on media items.

For a full ‘dark mode’ experience, showing all control buttons and lists on dark window backgrounds, it is mandatory to run an operating system with a complete dark interface. Depending on the type of system, some OS customization may be required to achieve such UI. Here’s an example of a dark style for Windows 10. With macOS10.14 or later, there’s a native Dark Mode available.

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New in CSIX:

AE Series (Advanced Editions)

The AE Series includes four theme variants: A ‘dark mode’ theme, a bright theme and two semi-dark compositions named “Slate” and “Loom”. All themes in the series use the narrow layout type, which provides a good overview of projects with many tracks, as well as allowing more space when working on a smaller laptop.

The themes take full advantage of the latest theming possibilities in REAPER 7, and include more than 70 action buttons, which can be set to where and how they appear. The predetermined action buttons mainly use native scripts, available with the installation of REAPER (and SWS), however, all buttons can relatively easily be changed to run custom actions or scripts from installed third-party extensions. Here’s a video with an example of how to edit the buttons.

The AE Series includes alternate layouts such as ‘BIG METER’, which is suitable for working with multi-channels, as well as a flexible ‘TITLE-TRACK’ layout meant for inserting separators or folders with large titles.

For the mixer there are three standard layout formats: A and B with the optional setting ‘Narrow Form’ also having a vertical slider for volume adjustment, and Layout C which shows the very slim channel strip.

Custom color coverage on control panels can be set as desired, and by having the different theme variants, it provides ample opportunity to change the entire look. Every detail has really been taken care of in these themes!

Learn more about latest features and options in the AE Series: What’s New in CSIX

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A lot of time has gone into developing the theme variants and the customized theme Adjuster. All CSIX themes are constantly evolving and are continuously improved based on important user feedback and new ideas that arise. At the same time, the ambition is to maintain the CSIX look and feel with new features and tools that are introduced in REAPER.

To get an idea of how CSIX behave, you can start by trying out the Basic Editions, and then move on to other variants. For questions and inquiries, please use the contact form below, or get in touch via the social forums.

If you would like to follow the social blog and read news about the development, you can head over to the related thread on REAPER Forum

For installation, please refer to the CSIX GUIDE with instructions on how to set up the theme, it’s only a few easy steps to follow. From there on, any update and even new theme variants use the same basic installation, same fonts, icons etc.

Finally, when you get familiar with the layouts and options, you’ll most likely experience a highly creative flow when working with CSIX for REAPER!

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