The Vanity Metrics Trap
Every executive building a side project will be tempted by vanity metrics—the numbers that look impressive in a dashboard but tell you nothing about the health of your business. Page views, registered users, social media followers, and app downloads all share the same fatal flaw: they measure attention, not value. A product with 10,000 registered users and zero revenue is not a business—it is a hobby with a large email list.
The vanity metrics trap is especially dangerous for executives because you are accustomed to managing by numbers. When your side project dashboard shows growing user counts and increasing page views, your executive instincts say "this is working." But without connecting those numbers to revenue, retention, and engagement, you are flying blind—and potentially investing more time and money into a product that has no path to profitability.
The antidote is disciplined metric selection. Choose five metrics—no more—that directly measure whether your product delivers enough value that customers will pay for it and keep paying for it. Track these five metrics weekly, ignore everything else, and make every product decision based on what these numbers tell you.
The Five Metrics That Predict Side Project Success
Metric one: activation rate. What percentage of registered users complete the core value action within their first session? The core value action is the moment your product delivers on its promise—running their first report, completing their first workflow, generating their first output. If users sign up but never reach this moment, your onboarding is broken. Target: 40-60% activation within the first session.
Metric two: weekly retention rate. Of the users who activated last week, how many returned this week? Retention is the single most important predictor of long-term business viability. A product with 50% weekly retention will compound into a growing user base. A product with 20% weekly retention will never grow, no matter how many new users you acquire. Target: 40%+ weekly retention after week four.
Metric three: revenue per user (RPU). How much revenue does each active user generate per month? This metric tells you whether your pricing is right and whether your product delivers enough value to justify the price. For B2B side projects, RPU should cover your per-user costs (hosting, support, third-party services) by at least 5x. If RPU is below this threshold, you have a pricing problem or a value delivery problem. Metric four: customer acquisition cost (CAC). How much does it cost to acquire a paying customer? In the early stages, CAC is often zero because your network provides your first customers. As you grow beyond your network, CAC will rise. The critical relationship is CAC to lifetime value—your LTV should be at least 3x your CAC for a sustainable business. Metric five: Net Promoter Score (NPS). Would your users recommend your product to a colleague? NPS measures satisfaction and predicts organic growth. A score above 40 indicates strong product-market fit. Below 20, you have fundamental product issues to address.
Setting Up Analytics Without Over-Engineering
You do not need a data engineering team to track five metrics. For most executive side projects, a simple analytics setup takes less than a day and costs under $100 per month. Start with two tools: a product analytics platform (Mixpanel, Amplitude, or PostHog) for behavioral metrics, and a simple spreadsheet for financial metrics.
In your product analytics tool, define five events that correspond to your five metrics. User registration (for calculating activation rate), core value action completed (for activation rate), weekly login (for retention), payment processed (for RPU and revenue), and NPS survey response. Configure a weekly dashboard that shows these five numbers and their week-over-week trends.
For financial metrics, maintain a simple spreadsheet updated weekly. Track total revenue, number of paying customers, customer acquisition spend, and calculate RPU and CAC. This spreadsheet takes five minutes to update each week and provides the financial clarity you need to make investment decisions. Tools like FileJoy can help you organize and manage these reports as your analytics needs grow.
Using Metrics to Make Executive Decisions
Metrics are only valuable if they drive decisions. Establish decision thresholds before you launch, so you are not rationalizing weak numbers after the fact. For example: if activation rate is below 30% after four weeks, invest in onboarding redesign before any new feature development. If weekly retention is below 25% after six weeks, conduct user interviews to identify the retention barrier before spending another dollar on marketing.
Review your five metrics every Monday morning. This weekly cadence matches the executive decision-making rhythm you are accustomed to—a brief review that identifies whether the business is on track and flags any areas that need attention. If all five metrics are trending in the right direction, stay the course. If one or more are declining, investigate immediately.
The ultimate metric decision is the continuation decision. After 90 days of tracking, your metrics should tell a clear story: is this side project on a path to becoming a sustainable business? Strong metrics across the board warrant additional investment—more features, more marketing, perhaps a dedicated team. Weak metrics despite iteration and effort warrant an honest conversation about whether to pivot or wind down. Working with an experienced partner like Sizzle can help you interpret these metrics in context, benchmark against comparable products, and make the most informed decision about your side project's future. Schedule a strategy session to review your metrics and plan your next move.
Ready to Build Your Side Project?
Executives across every industry are turning side project ideas into real products—without pulling a single engineer off their core team. The key is working with a partner who understands both the technical execution and the strategic context of building alongside a day job.
Sizzle Ventures helps executives go from idea to launched product in as little as 90 days. Our MVP Sprint is built specifically for leaders who need speed without sacrificing quality—and without touching their internal dev team.
Ready to explore what's possible? Start a conversation with Sizzle about bringing your side project to life.