Welcome to the Onyx Data August 2025 Challenge!

About ZoomCharts Mini Challenge

🏆 Main Prize: $300 Amazon Gift Card

ZoomCharts Mini Challenge is part of the global DataDNA – Dataset Challenge by Onyx Data, which unites 25K+ data enthusiasts worldwide, ranging from beginners to seasoned professionals, including Microsoft MVPs. Read more about the DataDNA challenge on the Onyx Data DataDNA website. Join the community on LinkedIn.

Why join ZoomCharts Mini Challenge?

1. Workshops & 1:1 Mentoring: Learn directly from experienced Power BI professionals through live workshops on report-building best practices, 1:1 mentoring sessions to review your report and get tailored advice.
2. Get Personal Feedback: Every participant receives detailed, personalized feedback on their report - a great opportunity to improve based on real input from seasoned analysts.
3. Free ZoomCharts PRO License: All participants get a ZoomCharts Developer License (worth hundreds of dollars) that gives full access to the Drill Down PRO visuals library.

🏆 Prize: 

The creator of the best report submitted to the Mini Challenge will receive a $300 Amazon gift card. The ZoomCharts winner will be announced in a special live webinar session on August 28, where we will review the Top 5 entries from the challenge.

Webinars

Learn more about ZoomCharts visuals & gain a knowledge advantage in the contest by joining the upcoming webinars! You'll also get the chance to your ask questions and get expert answers in the Q&A section.

Upcoming webinars

Top Power BI Membership Dashboards: What makes them unique?

28th August, 2025

08:00 AM - EDT

Discover the top Power BI dashboards from the fitness membership analysis challenge with Onyx Data & ZoomCharts, explore key insights, and see what made the winning reports stand out.

Learn more

Past Webinar recordings

Build a Membership Analysis Power BI Dashboard that Drives Action

Build a Power BI dashboard for fitness membership analytics step-by-step and learn how to submit your report to the DataDNA challenge.

Watch the recording

How to participate in Onyx Data DataDNA & ZoomCharts Mini Challenge? 

1. Register for the challenge: 

• Register for DataDNA ZoomCharts Mini Challenge using the form above ⬆️
  
• Activate your free Drill Down Visuals Developer License for Power BI. Read license setup instructions.
• Download Challenge dataset from Onyx Data DataDNA Main Challenge website.

2. Build your report in Power BI: 

• Set up an account in Power BI using the assigned license details (if you have participated in ZoomCharts Challenges in the past, you can use the same account you set up before).
• Use the account to access the full library of custom ZoomCharts Drill Down visuals. 
• Use the dataset to build a Power BI report including at least 2 ZoomCharts Drill Down Visuals in one report page. 

3. Improve your report and learn new skills: 

• To learn more about applying ZoomCharts visuals in your reports, participate in the challenge workshop. 
• If you have any questions or need advice, you can book a free individual consultation here.
• Check out the submissions from past challenges for inspiration. 

4. Submit your challenge entry: 

• Submit your report in .pbix format for validation using the form on this page.

If your submission doesn’t match the challenge criteria, you will be notified by email indicating the reason. Don't worry if this happens! You can fix the issue and resubmit your report. 

• Your report will be reviewed within 1–2 business days. Once it’s validated, you’ll receive a Publish to Web link via email. You can use this link to add the report to your portfolio or share it publicly online.
• All validated entries will also receive personalized feedback from the evaluation team via email within 1-2 business days. Use this feedback to revise your report and resubmit it before the deadline.

Note: Feel free to resubmit your entry as many times as necessary before the deadline.

5. Finalize your participation to compete for the prize

• Share a LinkedIn post on your profile with your Power BI project image, including the tags @ZoomCharts and @OnyxData, as well as the hashtags #dataDNA and #builtwithzoomcharts.
• After posting the report on LinkedIn, please submit it to the Onyx Data DataDNA Main Challenge for a chance to compete for all prizes.
• Follow ZoomCharts on LinkedIn
• Follow Onyx Data on LinkedIn

6. Attend challenge closing webinar to hear the results: 

• The submissions are evaluated by ZoomCharts team (see "Judging criteria" for more info). The submissions of Top 5 ZoomCharts Mini Challenge finalists are analyzed live during the challenge closing webinar to share the best practices and learning opportunities with the community.
• The author of the best report is rewarded with a $300 Amazon gift card from ZoomCharts.

Fitness Membership Analytics Challenge

Optimize Retention, Revenue, and Engagement

In this challenge, you’ll take on the role of a data analyst at MyGym, a fast-growing fitness center chain with multiple locations across California. MyGym offers a wide range of membership tiers, subscription models, and amenities, including group classes, personal training, and multi-location access.

Gaining insights into how members engage with these services is crucial for optimizing operations and designing targeted, effective membership offers.

Use this dataset to develop an analytical report or dashboard that helps MyGym:

• Understand which member segments bring the most value
• Identify areas for pricing, subscription, or service optimization
• Improve customer experience through data-driven insights
• Optimize staffing and facility allocation across locations
• Explore trends in retention, usage, and upgrade behavior

Questions to Explore:

• Which membership types are linked to the highest retention or revenue?
• Do pricing models (e.g., monthly vs. early bird annual) affect churn or satisfaction?
• Are some locations performing better than others in terms of engagement or profitability?
• How does personal training usage or group class participation influence value?
• What effect do discount types (promo, student, loyalty) have on final revenue?
• Is there a relationship between tenure and service usage or upgrade behavior?
• Do certain access types (off-peak, all hours, priority) impact visit frequency?
• What geographic patterns emerge from multi-location access behavior?
• How do different customer segments use the gym throughout the week?
• Can you identify clusters of high-value members or potential churn risks?

P.S. These are exploration prompts, not a checklist. Feel free to go beyond them and uncover unexpected patterns.

Technical requirements

• Build your report using only Power BI
• The number of pages in the report is not limited
• At least one report page has to contain a minimum of 2 ZoomCharts Drill Down Visuals. See a practical guide on Drill Down Visuals here

Judging criteria

Each report is evaluated based on three main criteria: intuitiveness, insightfulness, and interactivity. These factors ensure that the reports are not only accurate and functional, but also meet the target audience's needs and are ready to be presented to the end-users. 

1. Intuitive: How clear and easy it is to understand the report at a glance? (max 15 points)
   • Is the report visually appealing?
   • Choice of charts and visual elements
   • Does the report tell a story?
   • Is it not overwhelming to the user?
   • Choice of tooltips, titles, and legends
     
     
2. Interactive: How engaging and seamless is the report exploration and interaction with data? (max 15 points)
   • Clear navigation that allows user to explore the report
   • Use of slicers and other interactive elements
   • Smooth cross-chart integration
   • Is report optimized for touch devices?
   • Are tutorials and guiding elements helpful to the user?
     
     
3. Insightful: How accurate, complete, and meaningful is the data in driving decisions? (max 15 points)
   • Depth of analysis
   • Data cleaning and preparation
   • Does data show up accurately in the report?
   • Is report optimized for quicker loading time?
   • Does the report provide deeper exploration of data (drill-down)?

Dataset

My license

1:1 mentoring sessions

You can book a personal session with Senior Product Expert at ZoomCharts, Aivis Pavlovs, to gain practical knowledge about Drill Down Visuals and how they can be used to enhance data storytelling in a report.