KLM Labs

Small iPhone apps that each do one job

For people who run their own work, and a few for everyone.

Our apps

  • App Store screenshot: 5' 7-3/8" plus 2' 9-11/16" equals 8' 5-1/16", with fraction keys. App Store screenshot: the Roof pitch tool, a 3 ft rise over a 4 ft run giving a 9 in 12 pitch at 36.9 degrees.

    Construction Calculatorby KLM Labs

    Adds feet, inches and fractions exactly, with tools for stairs, roofs, rafters and concrete.

    • iPhone and iPad
    • 11 tools
    • No ads

    Free to download, with in-app purchases. Every feature, the calculator included, needs the free trial or a purchase: Yearly US$9.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$19.99 paid once (US prices).

    Features and pricesDownload Construction Calculator on the App Store
  • App Store screenshot: a flip clock reading 9:41 AM in large digits, with the date and the next alarm under it. App Store screenshot: choosing the flip, digital or retro LED face and its digit color.

    Flip Clockby KLM Labs

    Turns your iPhone or iPad into a big bedside or desk clock, with alarms that ring even on Silent.

    • iPhone and iPad
    • 3 clock faces
    • No ads

    Free to download, with in-app purchases. Past the welcome page, everything (the clock, alarms and widgets) needs the free trial or a purchase: Yearly US$29.99 a year with a 7-day free trial for eligible new subscribers, or Lifetime US$39.99 paid once (US prices).

    Features and pricesDownload Flip Clock on the App Store
  • App Store screenshot: an invoice being filled in on site, with line items and a running total. App Store screenshot: the finished invoice as a PDF, ready to send.

    Invoice Makerby KLM Labs

    Make an invoice or estimate on the job, even with no signal, and send it as a PDF.

    • iPhone and iPad
    • Works offline
    • No account needed

    Free to download, with in-app purchases. Entering your business details and first client is free; making invoices and estimates needs Invoice Maker Pro: Yearly US$39.99 a year with a 7-day free trial for eligible new subscribers, or Monthly US$6.99 a month (US prices).

    Features and pricesDownload Invoice Maker on the App Store

Coming soon

Seven more apps: two in Apple's review, five in design.

  • Signer

    In Apple's review

    Sign and fill in a PDF, then share it. No account needed.

  • PDF Scanner

    In Apple's review

    Scan paper to PDF and search the words in every scan. No ads.

  • Saldo

    In design

    Log a purchase in seconds and see what's left until payday.

  • Mimic Game

    In design

    A party game for one phone: copy a sound, get a score, pass the phone.

  • Who Am I?

    In early design

    Phone on your forehead: friends give clues, you tilt to guess or pass.

  • Chat Story Maker

    In design

    Write a chat story with characters you invent, then turn it into a video.

  • Ambiance

    In design

    Party games on one phone, written in French first. The page is in French.

Every app on the way

Free templates and charts

Print them or copy them. No sign-up.

Charts and guides

See all 7 charts and guides

Invoice templates

See all 7 invoice templates

Questions?

Email support@klmlabs.app. Every app works on iPhone and iPad, with no ads.

Last updated .