# NIBB

> A gym for your mind. Ten minutes a day, one topic for the whole planet.

NIBB (nibb.ink) is a daily thinking-and-writing practice. Every day the entire
world gets the same single question. You write for ten minutes. The app does not
correct your writing — it shows you how clear your sentences are, and nothing else.

## What it is

- **Ten minutes a day.** One question. One piece of writing. That is the whole product.
- **One topic for the planet.** The topic changes at 00:00 UTC and is the same in every country.
- **It does not fix your sentences.** No rewriting, no grading, no "better version."
- **Clarity score (0–100), computed in your browser.** No server, no model. It works in airplane mode.

## What it does not have

No likes. No stars. No rankings. No view counts. No comments. No streak-shaming.
There is exactly one reaction in NIBB: **◆**.

## ◆

When you read someone else's writing, you may tap **one sentence** that stayed with you.
That sentence is saved into your own drawer. The writer sees how many people chose
each sentence; readers never see the counts. One sentence per piece, one tap per person.

## The clarity score

A number from 0 to 100 — higher means lighter. It is computed from five things:
average sentence length, share of long words, connective endings per sentence,
filler words, and passive or translationese patterns.

The app says one of four things and nothing else:

- 80+ — 간결하고 읽기 편해요 (clear and easy to read)
- 60–79 — 보통이에요 (about average)
- 40–59 — 문장이 조금 무거워요 (a little heavy)
- under 40 — 문장이 무거워요 (heavy)

The app never uses the words "readability", "grade level", or "easy to understand."

## Where AI is used

In exactly two places, and nowhere else:

1. **수정해볼래요 (Revise)** — after you finish writing, you may send one chosen
   sentence for questions about it. Three times a day. Adults and teens only.
2. **World tab translation** — writing from other countries is translated so you
   can read it. The original is always kept and shown underneath.

Everything else — the clarity score, the 30 prompts in 도와줘요 (Help) — runs on
fixed rules inside your browser. Zero network requests.

## Tuesdays and Fridays — 해부 (Dissection)

Twice a week there is a second, different exercise: one advertisement is taken
apart in four boxes — what is the claim, is there evidence, **what was left out**,
who benefits. Only the third answer goes to the plaza, because it is the only one
where people give genuinely different answers. It takes about five minutes and is
not timed.

## Children

Children's accounts (8–13) exist only under a family plan. There is no AI in a
child's account — the button is not hidden, it is not in the page at all. A child's
writing goes only to a plaza the guardian has opened. No personal data is collected.

## Pricing

- **Three days free.** 작심삼일 — the Korean phrase for a resolution that lasts three days.
  No card is asked for during the three days.
- **Individual** — $14.89/month, $148.89/year
- **Family** — $39.89/month, $398.89/year, up to 4 members including children
- **Always free, even after the trial ends:** the sentences you collected with ◆.

## Languages

Korean and English now. Other languages open as enough writers wait for them.
Everyone writes in their own language on the same daily topic.

## Links

- Site: https://nibb.ink
- Korean version of this file: https://nibb.ink/llms-ko.txt