Zigbee vs Wi-Fi channel planner
Zigbee and 2.4 GHz Wi-Fi share the same band. Enter the nearby Wi-Fi channels and get the Zigbee channel with the clearest space.
Which Zigbee channel should I use?
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Smart home tools that answer one question properly.
Every tool exists because the useful answer was buried in a forum thread, a PDF, or a manufacturer page. Each one works in your browser, shows its calculation, and stays focused on the job.
100% FreeAlways will be
Instant ResultsNo waiting
Private & SafeNothing stored
Works OfflineAfter loaded
Focused calculators and checkers
Tools that do one job well
No bloated dashboards. Pick the question you need answered and get a practical result.
Thermostat C-wire checker
Select the terminals behind your old thermostat. Find out whether you have a common wire, what HVAC system you likely have, and your options.
Do I have a C-wire?
Video doorbell power checker
Most video doorbell reboot problems are voltage problems. Check transformer capacity, voltage drop and the wire run before buying parts.
Is my transformer enough?
Smoke & CO alarm planner
Describe your floors, bedrooms and appliances. Get a room-by-room placement list and a count that explains the reasoning.
How many do I need, and where?
Atmos passthrough checker
Trace the signal path from source to screen. See which audio format survives each connection and what change removes the bottleneck.
Am I really getting Atmos?How the tools work
Why these are free, and what that means
There's no account, no email capture and no affiliate link in any of them. They run entirely in your browser — nothing you type is sent anywhere, because there's no server to send it to. You can use them offline once the page has loaded.
Each one shows its working. Where a result comes from a formula, the formula is on the page. Where it comes from a published standard, the standard is named. If you disagree with an answer you can check it yourself, which is the point — a tool you can't verify isn't much better than a guess.
What they cannot do
These are planning aids, not inspections. They model the specific thing they describe and nothing else. The Zigbee planner doesn't know about your walls; the doorbell checker doesn't know your transformer is thirty years old and underperforming its label; the alarm planner doesn't know your local fire code. Where a result matters for safety or for something expensive, treat it as the starting point for a conversation with someone who can see the actual installation.
Something wrong, or something missing?
If a tool gives you an answer you think is incorrect, that's worth knowing about — the calculations are documented specifically so errors can be found. Tools get added when a question turns out to be common and the existing answers are poor.