The work, working.

Four tool sites we built ourselves, three live and one launching soon, and two demo tools built for typical agency clients. Each has a real screenshot and a miniature you can use here.

DuesLedger

A UAE end-of-service gratuity calculator, built from the text of the law.

Launching soon

The problem

Most gratuity calculators give a number and nothing else. A worker cannot check it, and a writer cannot cite it, because nobody says which rule produced it.

What we built

A calculator that follows Federal Decree-Law No. 33 of 2021 step by step and shows every line of the sum. It marks which points are confirmed by the text and which are our reading. Around it: six guides, a methodology and sources page, and a way to report a mistake.

Status: Built and verified. Launching soon.
Lighthouse, mobile: 100 in all four categories on all 13 public pages, measured on the production build on 12 November 2026
Tests: 61 automated tests, including six worked examples calculated by hand
Page weight: The calculator page sends 95 KB
Sources: Three official legal texts, each quoted and dated

68,991.78UAE dirhams (AED) of gratuity

How the gratuity is worked out
Service	2,646 days
Daily wage, basic ÷ 30	400.00
First 5 years, 21 days a year	42,000.00
After 5 years, 30 days a year	26,991.78
Limit of two years’ basic wage: not reached	68,991.78

Worked examples

Employment details First day of work Last day of work Monthly basic wageAED Unpaid leavedays

For foreign, full-time, monthly-paid workers in the UAE private sector, under Federal Decree-Law No. 33 of 2021, Article 51. This miniature leaves out the caveats the full calculator states. It is information, not legal advice.

Pool Calculus

Pool and hot tub calculators that show the working.

Visit poolcalculus.com

The problem

Pool owners need volumes, chemical doses and running costs. Most calculators return a number with no formula and no source, so nobody can tell a good one from a wrong one.

What we built

22 calculators in four groups: pool size and water, water chemistry, equipment and energy, and hot tubs. Each works in US or metric units and shows the formula under the answer. The site names its sources, among them the CDC Model Aquatic Health Code, the U.S. Department of Energy, ENERGY STAR and EPA WaterSense.

Status: Live
Calculators: 22, counted on the live site on 12 November 2026
Units: US and metric, switchable on every page
Also on the site: A pool chemistry chart and a “How we calculate” page

Pet Calculus

Pet maths for dog and cat owners, with veterinary sources.

Visit petcalculus.com

The problem

Owners ask how much to feed, how old a pet is in human years, whether a food is dangerous. The answers online are often a guess with no source behind it.

What we built

17 free calculators: ten for dogs, six for cats and one for fish tanks. Every tool shows its working and links to the published guidance it uses, from sources such as the Merck Veterinary Manual, AAHA and the Pet Nutrition Alliance. The numbers a visitor types stay in their browser, and there is nothing to sign up for.

Status: Live
Calculators: 17, as stated on the site
Privacy: Calculations run in the visitor’s browser. No sign-up.
Sources: Linked at the bottom of every calculator

2 ¾cups of food a day

1,050kcal from food a day

How the portion is worked out
Resting energy, 70 × kg^0.75	725 kcal
Neutered adult, × 1.6	1,165 kcal
Less 10% kept for treats	1,050 kcal

Your dog and its food

Pounds Kilograms

Weightlb Calories in the foodkcal/cup Leave 10% for treats

For a spayed or neutered adult dog. The formula is from the Merck Veterinary Manual. An estimate, not a replacement for a vet who has examined your dog.

FixPlainly

Plain-English fixes for washers and dishwashers.

Visit fixplainly.com

The problem

An error code appears on a washer. Search results copy each other, and few say where the meaning came from or whether the fix is safe to try.

What we built

An error-code lookup with 193 code meanings, each checked against the manufacturer’s own documentation, plus 16 step-by-step problem guides in which every step carries a safety rating. A repair-or-replace calculator shows both of its tests and their sources.

Status: Live
Error codes: 193 meanings covering 449 display variations, as stated on the site
Guides: 16 problem guides: 8 for washers, 8 for dishwashers
Sources: Each page links to its sources and shows the date they were last checked

Repair itBoth tests pass.

The two tests
Repair share, quote ÷ new price	31%
Test 1: 50% or less	Pass
Repair cost per year left	$63
New cost per year of life	$80
Test 2: repair per year is no higher	Pass

The appliance Appliance Ageyears Typical lifespanyears Repair quote$ Price of a new one$

Test 1 is the Consumer Reports 50 percent rule. Test 2 is FixPlainly’s own method. Typical lifespans are from the NAHB “Study of Life Expectancy of Home Components”. Energy and water savings from a newer model are left out.

Two demos for agency clients

These are not client work. We built them to show what a Starter tool and a Standard asset look like for a typical B2B client, and how one restyles to a brand.

SaaS pricing calculator

Seats, plan and billing period in. The price out, with the saving for paying yearly. The plans are samples you can edit.

Sample output

$417

a month for 25 seats on the sample Business plan, billed yearly

Open the pricing calculator

ROI calculator

Time saved, hourly cost and the price of the product in. First-year return and payback time out, with every assumption visible.

Sample output

586%

first-year return on the sample inputs

Open the ROI calculator

Want one like these?

Send us one client site. We reply with three tool ideas and the reason each could earn links.

Book a free 20-minute brief