Kordal Labs

Six products we build and run. Use one, and judge the work.

Kordal Labs is where we publish small tools of our own. The five tools work in your browser with no account to create: the file tools never upload your file, and the calculators work the figures out on your own device. Rateslip, our product in early access, takes a sign-in, because it keeps your documents.

Rateslip’s home page: the headline “The rate went up. The freight came down. Nothing actually changed.” beside a synthetic purchase order with Version B selected, its rate and transport figures highlighted, and under it the landed cost per square metre read from both versions, ₹1,297.25 each, with the verdict “Comparable · landed cost identical”

Rateslip (opens in a new tab)

Live

Reads supplier quotations, purchase orders and invoices from the printed page, not from text hidden inside the file. Wall panels and boards go on one landed cost per unit; any other line is shown with the reason it has none. The model reads; the sums are done in code. It takes a sign-in, because it keeps your documents.

Reads the printed page, not the file’s hidden text · a missing cost stays unpriced

rateslip.in

Zero-Trust PDF Studio

LiveRedact a PDF in your browser. The file never leaves your device.
Zero-Trust PDF Studio with a synthetic invoice open in its workspace: black bars over the lines under Bill to, the account number and the total due, the export button reading Export (3 marks), and the Find and redact panel listing its number detectors with one account-number match already marked

A capture of Zero-Trust PDF Studio at work. The tool itself opens on its own site.

Zero-Trust PDF Studio (opens in a new tab)
  1. WageCalcs: the time-and-a-half calculator filled in with $30 an hour, 40 regular hours and 8 overtime hours, beside a pay stub that works it out line by line, regular pay $1,200.00, overtime at 1.5× $360.00, gross pay $1,560.00, under the line “Federal and state rules, checked September 25, 2026”

    WageCalcs (opens in a new tab)

    Live

    Overtime, time and a half, double time and paid time off, worked out line by line like a pay stub. Each calculator applies the federal rule and your state’s, and links the rule to its source.

    Every rule cited to its source · rules checked 25 Sep 2026

    wagecalcs.com
  2. Print Labels From Excel with a pasted list of three invented rows, Sample Customer One, Two and Three, shown as a table, the label layout beneath it, and beside them a preview of an Avery 5163 sheet with the three address labels and the first label enlarged

    Print Labels From Excel (opens in a new tab)

    Live

    Turn a spreadsheet into a print-ready Avery sheet. No Word, no mail merge, no account. Add your list, check the label layout, choose your sheet, download the PDF.

    Runs in your browser · nothing uploaded

    printlabelsfromexcel.com
  3. Capital Gains Tax Calculator with a synthetic scenario filled in: stocks held more than a year, $50,000 proceeds, $30,000 cost basis, single filer, $80,000 other income, no state tax; beside the form the estimate reads federal tax on this sale $3,000, 15% of a $20,000 taxable gain, above a bar showing where the income sits against the rate thresholds

    Capital Gains Tax Calculator (opens in a new tab)

    Live

    Short and long-term US capital gains at current brackets, with every step of the calculation shown rather than just the total.

    Show your work: every step cited · nothing leaves your browser

    capitalgainstaxcalc.com
  4. My SE Tax Calc on a synthetic scenario: $60,000 of 1099 gross revenue and $5,000 of business expenses for a single filer, and under it a total federal tax of $10,884, split into self-employment tax and federal income tax, with four quarterly payments of $2,721 and the note that the estimate excludes credits and state tax

    My SE Tax Calc (opens in a new tab)

    Live

    Self-employment tax, quarterly estimates, 1099 against W-2, and mileage deduction. Four calculators that follow Schedule SE and the 2026 rate tables line by line.

    Every constant cited to its source · verified 12 Sep 2026

    mysetaxcalc.com
Why

Why Labs exists

Anyone can describe how they build. We would rather show it. Each of these is a product we designed, built and operate, and you can open it and judge it yourself: how it reads, how it handles a mistake, what it does with your data.

Labs is also where we work things out. A calculator that cites the rule behind every step, a redaction that rebuilds the page instead of covering it, a build that has to run entirely on the device: each was worked through here first, and what holds up goes into client work.

Need something like this for your business?

Start a project

Kolkata, India · We reply within one business day.