Low voltage · Free

The free CRM for low-voltage, security and access-control contractors

Your clients, your bids and your payments in one app. Your client signs the bid on their phone and pays into your own Stripe. Plus 3 new houses in your county, at the prewire, after framing.

$0. No card. No time limit. It is not a trial.

How to use Build Radar for free - 3 minutes.

One free app

Run your low voltage business from your phone

What's free

Everything you need to run the job

  1. 13 new houses in your county.Picked for low-voltage, security and access-control contractors: at the prewire, after framing. The address and any phone numbers on file.
  2. 2A CRM: all your clients in one place.Each client shows where its job stands: sentsigneddepositstarteddonepaid
  3. 3Bids your client signs on their phone.You send each bid by email.
  4. 4Online payments into your own Stripe account.Build Radar takes no fee.
  5. 5To-do list, calendar, photos, notes and inventory.One account for up to 3 people (you and two more). English or Spanish.
$0. No card. No time limit.

It is not a trial. The free tools don't stop after some days.

Stripe charges its own fee. By bank (ACH): 0.8%, never more than $5 a payment.
How to use it

How to run Build Radar for free, in 7 steps

  1. Step 1 of 7

    Sign up

    • Tap Sign up free on this page. Your trade, Low voltage, is already picked.
    • Pick your county.
    • The app picks 3 houses at the right stage for your trade. Don't like one? Tap Swap, before you sign up.
    • Type your email. No card.
    • Your 3 houses show as gold pins on the map. Tap one for the address, the build stage and any phone numbers on file.
  2. Step 2 of 7

    Turn on online payments (once)

    More › Money › Get paid online › Connect Stripe

    The money goes into your own Stripe account. Build Radar takes no fee.

  3. Step 3 of 7

    Add a client

    Clients › + Add client

    Type their name, phone, email and address. Each client gets a card that walks the job: site visit, bid, deposit, scheduled, done and paid.

  4. Step 4 of 7

    Make a bid

    On the client's card: Bid

    Pick One price for the whole job or Line by line. Use your own prices and terms.

  5. Step 5 of 7

    Email it

    Send

    Your client gets one email with a link. To send it another way, tap Copy the link instead.

  6. Step 6 of 7

    They sign and pay

    • Your client opens the link on their phone, reads your bid and signs it right there. The app tells you.
    • If your bid asks for a deposit, they can pay it right after they sign.
    • Set your deposit in More › Business setup › Deposit.

    With no Stripe account connected, the client sees "Pay by check" only.

  7. Step 7 of 7

    Run the job

    • When it's done, send the final invoice from the client's Money tab.
    • Keep your to-do list, calendar, photos, notes and inventory in one place.
    • Add your team: up to 3 people on one account. Switch to Spanish any time.

Start free today

Your trade is already picked. Pick your county, see your 3 houses, type your email.

Sign up free - Low voltage

No card. No time limit.

Screens are from a test account with made-up clients. Names, addresses and phone numbers are blurred. The 3 houses come from the counties Build Radar covers. Not every house has a phone number on file. Stripe's fees are Stripe's, as of October 2026.
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