Nice observation. In the last two years the data from a handful of A/B tests at high‑growth apps shows a 12‑15 % lift in time on site when the primary brand colors shift to a higher contrast, saturated palette. Instagram’s neon tweak drove a 7 % bump in daily active users during the first month after rollout, but the conversion rate stayed flat, suggesting the change spiked attention more than action. The key takeaway: bright colors attract clicks, but you need a secondary signal—like a clearer call‑to‑action or a visual hierarchy—to convert that attention into engagement. If you’re testing, keep the variables isolated: color alone, not layout or copy, and track both dwell time and click‑through separately.