#002ToolsPillarLive
Free, instant, privacy-first calculators — Schengen, FIRE and TDEE.
“We believe a calculator should answer and vanish. Numbers are personal — the math should happen on your device, not on someone's server.”
Why we built it
The problem
The calculations people actually live by — how many Schengen days are left, how close FIRE is, how many calories a body burns — live in cluttered sites full of ads and sign-up walls. The answer is buried under the noise.
The idea
CalcAtlas
The creation
We built CalcAtlas as a small atlas of calculators — Schengen 90/180 tracking, FIRE planning and TDEE — all running locally in the browser, with instant results and zero uploads. Each one is one screen, one answer, done.
This creation began as #002 in our idea archive.
Observation
Answers hidden behind sign-up walls.
Idea
Instant, local, no accounts.
Creation
Schengen, FIRE, TDEE — one screen each.
Release
Live at calc.100ideas.net.
Know exactly how many visa days are left — no spreadsheets.
See how close you are to financial independence, instantly.
All math runs in your browser — nothing is uploaded.
Yes — every calculator is free and runs entirely in your browser.
Travellers tracking Schengen days, FIRE-curious savers, and anyone who wants a TDEE number without the ads.
Most calculator sites are cluttered with ads and accounts. CalcAtlas is instant, private and done in one screen.
Started as #002 — CalcAtlas
Free, instant, privacy-first calculators — Schengen, FIRE and TDEE.
A simple way to work with documents.
“We kept asking: what if the PDF tool disappeared into the background, leaving only the document and the one action you wanted? Why did we make this — because a document task should take seconds, not a tutorial.”
Compress JPG and PNG images online — processed locally.
“We asked: why should compressing an image require uploading it anywhere? The browser can do this locally — so why not build a compressor that never sees the network at all? That is why we made this.”
Explore AI models through a simple interface.
“We asked: why should comparing AI models require code? We wanted a place where a creator could put the same question to several models and feel the difference in their answers. That is why we made this.”
More from the archive — all creations
CalcAtlas is a Tools creation from 100ideas. Small idea, useful creation.
Also from us: all creations