Tutorials, vendor comparisons, and the RF math behind predictive WiFi planning. Written for home-lab operators and small-office network engineers — no marketing fluff.
24 September 2026
A browser cannot read WiFi signal strength, so it cannot run a survey. A predictive heatmap never needs to — it is computed from the floor plan, the walls and the datasheet. The line between the two, the maths, and what prediction costs.
23 September 2026
The AP count by floor area AND interior wall material, the per-band attenuation figures it is derived from, and the link budget worked out in full — so you can check the answer instead of trusting it.
15 July 2026
The four reasons Zigbee sensors go offline — router starvation, walls, WiFi channel overlap, USB3 noise — and how to plan the dead spots out on a floorplan.
3 June 2026
An honest comparison of the genuinely-free WiFi planners — WiFi Heatmap, UniFi Design Center, Hamina free, NetSpot, and the paid engineer-grade tools — plus the practical free workflow for a home or homelab.
19 May 2026
Yes, a free Ekahau alternative with no download and no account exists. Every free option in 2026 — what each needs before you can start, what it plans, and where it falls short.
19 May 2026
A walkthrough of planning coverage for a 100 m² brick-walled apartment: measuring, deciding on AP count, calibrating, drawing walls, placing APs, validating.
19 May 2026
The free-space path-loss formula, the per-material attenuation table (after ITU-R P.2040 and P.1238), and the additive multi-wall approximation — with a worked 5 GHz example.
The editor runs in your browser, free and with no signup. Place as many access points as you like; exports include five.