How We Keep Mobile Session Replay 17x Cheaper Than PostHog
Rejourney, a mobile session replay tool, achieves significantly lower pricing than PostHog through deliberate engineering choices. PostHog charges $85/month for 25,000 sessions, while Rejourney charges $5/month—a 17x difference. At 350,000 sessions, Rejourney is 20x cheaper ($35 vs $712.50). The key technical decision is capturing the framebuffer at 1.25x scale (80% linear dimension) instead of native resolution. Compared to 3x Retina, this reduces raw pixel count by 5.8x before JPEG compression. Additionally, the default frame rate is 1 frame per second, further reducing data. These choices lower CPU work, memory pressure, upload bandwidth, object storage, and replay egress costs. The article, published on DEV Community on May 18, 2026, explains that the cost advantage is sustainable due to a stack of engineering decisions, not a single trick.
Developers can drastically reduce session replay costs without sacrificing essential functionality.