Best energy tracker for bootstrapped startups

The productivity and wellness tracking space has exploded—there are roughly 200+ energy, focus, and mood tracking apps on the market today, ranging from Toggl and RescueTime to wellness platforms like Eight Sleep and Oura. The dominant failure pattern is that existing tools either over-engineer (requiring daily journaling, heart rate data, sleep integration) or under-deliver (they're generic habit trackers with no startup-specific context like shipping velocity, sprint cycles, or founder-specific stressors). The actual gap sits at the intersection of simplicity and founder-specificity: a tool that lets bootstrapped teams log energy states in 5 seconds, correlate that data to shipping output and revenue metrics, and surface patterns without adding friction. Most competitors target either B2B enterprises (expensive, complex) or individual wellness (not team-aware). A new entrant should focus on: (1) one-click logging (voice, emoji, or single-tap), (2) integration with tools already in the startup workflow (GitHub, Stripe, Linear, Slack), and (3) shipping a dashboard that shows energy-to-output correlation—not just trends, but actionable signals like "your team's energy drops 40% after all-nighters, but ships 3x faster.”