---
title: Check Sign Letter Height Against Viewing Distance — Free
description: A sign that reads at the counter can vanish at the door. Apply your chosen height-per-distance factor to each viewing distance and see the shortfall in millimetres before the sign is made.
category: accessibility
last_verified: 2026-09-28
freshness: green
published: 2026-09-28
canonical_url: https://gratis-ai.pages.dev/articles/sign-letter-height-viewing-check.html
companion_app_url: https://gratis-ai.pages.dev/apps/sign-letter-height-viewing-check.html
reading_time_minutes: 4
tags: accessibility, signheight, local-first, planning, no-account
---

# Check Sign Letter Height Against Viewing Distance — Free

A sign that reads at the counter can vanish at the door. Apply your chosen height-per-distance factor to each viewing distance and see the shortfall in millimetres before the sign is made.

**Free and complete.** This guide is a standalone free tool — no account, no card, anywhere. The only paid option is one optional extra outcome: $4 one-time. Nothing in the free tier is gated.

## Who it's for

Anyone seeking practical 100% free AI workflows — no paid API keys, credit cards, or subscriptions

## What's free

- one complete height sighting rule run in the app
- three samples plus unlimited article-demo runs
- unwatermarked result text and an explicit, user-triggered state link

## Optional paid add-on

**$4 one-time.**

- print the height sighting rule with its row workings
- CSV of mm short and row explanations
- last five readings saved in this browser profile

## Sources & verification

- Tool: GratisAI local-first instrument (no key, no account)
- Primary source: the free tool itself (local-first, no external dependency)
- Last verification: 2026-09-28 (green)

## Use it

- Interactive guide: https://gratis-ai.pages.dev/articles/sign-letter-height-viewing-check.html
- Companion app: https://gratis-ai.pages.dev/apps/sign-letter-height-viewing-check.html
- This machine-readable mirror: /mirrors/sign-letter-height-viewing-check.md

*Generated free at https://gratis-ai.pages.dev/articles/sign-letter-height-viewing-check.html — every guide on GratisAI is a complete, working tool. $0, no account, no card, anywhere.*