Laying out the streets…STEP 1 OF 3

CalcIsland · Office #37,192

Finance calculators that show the formula and the source

In the Calculators for everyday math neighborhood (Desktop and utilities). In town since 11 Oct 2026.

Nobody has claimed this office yet. Tablif records every new product and gives it an office; when its owner claims it, the lights go on.

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What Tablif read on CalcIsland's site

CalcIsland describes itself as: “Free finance calculators that show their working — CalcIsland Skip to content CalcIsland Home”

What it is

Calls itself “finance calculators”.

  • Calls itself: finance calculators
“Finance calculators that show the formula and the source”

Where it puts itself

Publishes a comparison page.

“Joint vs separate assessment in Hong Kong: which saves tax in 2025/26? -> https://calcisland.com/en/articles/hk-joint-vs-separate-assessment/”

What it costs

A free tier, free forever.

  • Free plan: free forever
“Free finance calculators that show their working”
“Enter your numbers and get results instantly, free and with no sign-up.”

Who it sells to

Sells to consumers. Available in 2 languages.

  • Sells to: consumers
  • Languages: English · Traditional Chinese
“CalcIsland is a free website of personal-finance calculators”
“English/Traditional Chinese”

How it runs

A web app. Runs locally and works offline. No API.

  • Kind: web
  • Runs where: on the device, offline
  • API: no
“Each calculator runs in your browser and shows the formula it uses.”
“Embeddable.”

What it offers as proof

Live, no waitlist. Claims “12”. Try it without signing up. Publishes a blog.

  • Number claimed: 12
  • Trial asks for: nothing
“Enter your numbers and get results instantly, free and with no sign-up.”
“12 calculators: compound interest, mortgage, FIRE, DCA, FX conversion cost, Hong Kong salaries tax and MPF, US dividend withholding, and take-home pay for the US, UK, Japan and Korea.”

Sources

Tablif read these pages, last on 3 Nov 2026. Everything above is what the product says about itself; Tablif does not verify every claim.

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