Dark-Mode Reports in Power BI: Cool or Confusing?

Lately, there’s been a lot of hype around dark-mode reports—especially now that dark mode is officially a thing in Power BI. It’s sleek, it's trendy, and, let’s be honest, it looks pretty cool.

But before we all jump on the dark-mode train, let’s pause for a second. Because, like most things in design, IT DEPENDS.

Dark mode isn’t a one-size-fits-all solution. Whether it’s a good fit depends on your audience, their environment, and accessibility needs.

💡 Quick Accessibility Refresher

Accessibility (or a11y) in data visualization means designing reports that everyone can use—regardless of ability. This includes users with:

• Visual impairments (e.g. color blindness, low vision, or contrast sensitivity).

• Motor impairments (e.g. difficulty using a mouse or keyboard due to conditions like Parkinson’s, cerebral palsy, or arthritis)

• Cognitive challenges (e.g. dyslexia, ADHD, or reading difficulties).

• Situational limitations (e.g. bright daylight glare or viewing on small screens).

  
  

When we design with accessibility in mind, we create reports that aren’t just usable—they’re intuitive, inclusive, and truly functional.

So, before you dim the lights on your reports, let’s break it down.

Accessibility Challenges of Dark-Mode Reports

Dark mode may look stunning at first, but it often sacrifices function for flair. Here’s why:

• Readability

  • For users with visual impairments, dark backgrounds can make text harder to read unless contrast is just right.

  • Users with dyslexia may experience increased visual distortion, like halos or blurring around text. (Spoiler alert: That’s not fun.)

    
    

• Color Contrast

  • Accessibility guidelines (shoutout to the WCAG!) recommend a contrast ratio of at least 4.5:1 for text-to-background color contrast ratio for small text (smaller than 17pt). Getting this right with dark mode can be tricky—especially when mixing in brand colors or complex visualizations.

  • What about charts and graphs? Poorly chosen colors can make them unreadable, particularly for colorblind users.

    
    

• Eye Fatigue Over Time

  • Sure, dark mode reduces glare in low-light environments, but for normal lighting? It can actually increase eye strain, especially if you're staring at your report for a prolonged period of time. Reading light text on a dark background isn’t exactly what our eyes were made for.

    
    

• Printing Nightmares

  • Yes, some people still own printers and print reports (bless them). And dark mode? Let’s just say it doesn’t translate well—hello, wasted ink and hard-to-read printouts.

When Does Dark Mode Make Sense?

Before we throw dark mode into the bin, let’s give it some credit. It does have its moments to shine (pun very much intended):

• Low-Light Environments: If your audience is using reports in dim settings, dark mode can be a lifesaver—reducing glare and making things easier on the eyes.

  

• User Preferences: Some users just LOVE dark mode for its aesthetic or reduced harshness. And let’s face it: it’s become a tech-culture favorite (Looking at you, developers.)

  
  

• Highlighting Key Data: Bright colors like greens, yellows, and reds pop beautifully against a dark background—just as long as contrast is on point.

Designing for Accessibility: My Recommendations

If you want to balance the cool factor of dark mode with the inclusivity of accessibility, here’s how you can make it work:

• Start with Light Mode

  • Light backgrounds with dark text are universally easier to read and interpret.

  • Stick to WCAG contrast guidelines to keep things accessible for users with low vision or color-blindness.

    
    

• Offer a Theme Toggle

  • Give your users options! Design an accessible version of both light and dark modes. (And stay tuned for a future blog post on how to do this.)

  • If you go dark, test it like your design life depends on it. Contrast, readability, charts—EVERYTHING!

    
    

• Test, Test, Test

  • Accessibility isn’t a one-size-fits-all solution. Gather feedback from users with diverse needs.

  • Accessibility checkers and screen readers are your friends—use them to catch issues early.

Why Accessibility Always Wins

At the end of the day, design is about people—not just aesthetics. Dark mode can be beautiful, but if it’s not accessible, it’s not doing its job.

By starting with light mode and providing accessible alternatives, we create reports that work for everyone. That’s inclusive design in action: building data stories that inspire, inform, and connect without leaving anyone out.

At MoonStory, we believe that great design isn’t just about looking good—it’s about designing with purpose and creating something that truly matters. So, whether you’re team light mode, dark mode, or toggle-all-the-way, let’s keep accessibility at the heart of our work!

What are your thoughts on dark mode in data design? Have you tried incorporating it into your reports? Share your experiences in the comments—I’d love to hear what has worked (and what hasn’t).

Happy Designing!

P.S. If you want to read more about designing for inclusivity, check out my other posts on Whitespace and Accessibility features in Power BI.

P.P.S. As always, don't forget to subscribe to MoonStory 🌙