Predictive design
Draw walls with real materials — drywall, concrete, glass, doors — and watch the coverage update instantly as you move access points.
Free & open source · Windows
WiFi heat maps,
designed and measured.
Plan WiFi networks on your floor plans: predict coverage, place the right access points, survey on site and deliver professional reports — all in one fast desktop app.
98%
coverage meets requirements
Updates in under 100 ms
105
AP models in the catalog
14
vendors
3
bands: 2.4, 5 and 6 GHz
6
types of heat map
Features
Everything you need to design great WiFi
From the first floor plan to the final report, without switching tools.
AP catalog
105 models from 14 vendors with radio values taken from official datasheets. Or enter your own access point data by hand.
Ceiling or wall mounting
Ceiling APs radiate all around; wall APs use a directional pattern you can aim right on the plan.
Automatic wall detection BETA
Import a plan and get walls proposed from the PDF's vector lines or from the image. Review, pick materials, done.
On-site survey
Walk the site and record real WiFi scans with your laptop. See the measured heat map, interpolated with IDW or kriging.
Predicted vs. measured
A difference map and statistics show where reality beats or misses the prediction, so you can calibrate the model.
Six heat maps
Signal strength, SNR, SINR, number of APs heard, channel overlap and requirements met — for every band.
Professional reports
A modern PDF with the AP placement, every heat map, coverage gaps and recommendations. Plus PNG and CSV exports.
Portable and private
One file, no installer, no account. It works offline and your floor plans never leave your computer.
How it works
From floor plan to report in six steps
A guided workflow that keeps the next step in sight.
-
1
Import the floor plan
PNG, JPG or PDF. Vector PDFs exported from CAD give the best results.
-
2
Calibrate the scale
Click two points of a known distance — a door, a dimension line — and type it.
-
3
Draw or detect walls
Pick a material for each wall, or let the beta wall detection propose them for you.
-
4
Place access points
Choose a model from the catalog, set channels and power, and check coverage live.
-
5
Survey on site
Optional: record real scans and compare them with the prediction.
-
6
Export the report
A PDF in English or Spanish, ready to send to your client.
Screenshots
A clean, modern interface
Reports
Reports your clients will understand
One click turns your design into a polished PDF.
- Cover with the access point placement
- Every heat map for each band, each one explained
- Coverage gaps numbered on the map and listed
- Rule-based recommendations: channels, power, widths
- In English or Spanish
Download Ondalux Heatmap
Free and open source. A single portable file: download it and run it — no installer, no account.
Download for Windows (64-bit)Verify the download
SHA-256 checksum of the file:
3d659421d1ddf8b268de881059b26530a8226eab942fa45af528ba6b7cb74626
The app is not code-signed yet, so Windows SmartScreen may show a warning the first time. Click “More info” and then “Run anyway”.
macOS and Linux versions are in development.
FAQ
Frequently asked questions
Is it really free?
Yes. Ondalux Heatmap is open source under the MIT or Apache-2.0 license, with no subscriptions, accounts or limits.
Do I need to install anything?
No. It is a single portable .exe: download it, double-click it and start working. You can run it from a USB drive.
Which floor plans can I import?
PNG, JPG and PDF (first page). Vector PDFs exported from CAD work best, especially for automatic wall detection.
How accurate is the prediction?
It uses a path loss model plus the loss of every wall crossed (2D, one floor), without reflections. It is a design estimate: survey the site to confirm and calibrate it.
Can I survey on site?
Yes, on Windows with the computer's built-in WiFi adapter. Scanning on macOS and Linux is still in development.
Are my floor plans uploaded anywhere?
No. Everything stays on your computer: there is no account, no cloud and no telemetry.
Which languages are supported?
The app and the reports are available in English and Spanish.
Where can I get help?
Write to support@ondaluxheatmap.com with your question; attaching the .lux project or the floor plan helps a lot.