DO101 Readability Checker

Spec sheet

What it does

DO101 Readability Checker evaluates English text with six established readability formulas and sentence-rhythm analysis.Read 15 Oct 2026 · do101.online

Purpose

The checker measures text readability with six published formulas and sentence rhythm analysis.Read 8 Oct 2026 · do101.online

Audience

The page describes the tool as useful for pitching an essay at the right level or getting web copy under a target grade.Read 8 Oct 2026 · do101.online

Privacy

The tool runs entirely in the browser, and text is processed on the user’s device rather than uploaded by DO101.Read 8 Oct 2026 · do101.online

Support

Support is handled through a Gmail address with best-effort replies from a small project rather than a staffed help desk.Read 15 Oct 2026 · do101.online

Maker

The maker identifies the product collection as DO101, but the pages opened do not state its headquarters or founding year.Read 8 Oct 2026 · do101.online

Advertising privacy

The privacy policy states Google AdSense advertising may use third-party cookies while tool files and text remain on-device.Read 15 Oct 2026 · do101.online

AI data exception

Only the optional AI router sends user-entered messages to a DO101 endpoint, and configured model providers may receive those messages.Read 15 Oct 2026 · do101.online

API and SDK availability

The reviewed official pages do not publish a public Readability Checker API, SDK or developer integration.Read 15 Oct 2026 · do101.online

Business model

DO101 says current tools are permanently free and hosting is intended to be funded by clearly labelled advertising.Read 15 Oct 2026 · do101.online

Company identity

The product pages identify the maker simply as DO101 and do not provide a legal company name, headquarters or founding year.Read 15 Oct 2026 · do101.online

Company scale

The contact page characterizes DO101 as a small project rather than an organization with a rotating support desk.Read 15 Oct 2026 · do101.online

Data-loss limitation

DO101 warns that it cannot recover work after a tab is closed because browser tools do not retain copies.Read 15 Oct 2026 · do101.online

Flesch score

The tool reports Flesch Reading Ease and explains the likely audience level in plain language.Read 15 Oct 2026 · do101.online

Formula guidance

The page says the formulas need about 100 words to settle.Read 8 Oct 2026 · do101.online

Grade formulas

It calculates Flesch–Kincaid, Gunning Fog, SMOG, Coleman–Liau and Automated Readability Index grades.Read 15 Oct 2026 · do101.online

Independent feature coverage

TechYorker marks readability formulas, sentence analysis and English support as documented, while clarity recommendations and browser-extension support are unknown.Read 15 Oct 2026 · techyorker.com

Independent platform listing

TechYorker lists the product as web-only, with a free plan and no published free-trial status.Read 15 Oct 2026 · techyorker.com

Independent review availability

TechYorker states that it had no user reviews for DO101 Readability Checker at the time checked.Read 15 Oct 2026 · techyorker.com

Interpretation limit

The formulas use word and sentence length as difficulty proxies and cannot determine clarity, factual accuracy or argument quality.Read 15 Oct 2026 · do101.online

Limit: sparse commercial information

MobilesTalk reports that no paid plans or prices are published and trial details are not stated.Read 15 Oct 2026 · mobilestalk.net

Limit: sparse feature documentation

MobilesTalk’s review says its directory entry did not document the checker’s functions for buyers.Read 15 Oct 2026 · mobilestalk.net

Longest sentences

The interface extracts the longest sentences so users can target them for rewriting.Read 15 Oct 2026 · do101.online

Median grade

A median grade is provided as a combined summary across the grade-level formulas.Read 15 Oct 2026 · do101.online

Minimum input

Scores require at least ten words and one complete sentence.Read 15 Oct 2026 · do101.online

News/date

The privacy policy was last updated 7 September 2026.Read 15 Oct 2026 · do101.online

No account

The service operates without user accounts or sign-up.Read 15 Oct 2026 · do101.online

No installation

DO101 describes its collection as requiring no software installation.Read 15 Oct 2026 · do101.online

No plagiarism database

The writing section explicitly says it does not provide a web-scale plagiarism checker and instead compares documents supplied by the user.Read 15 Oct 2026 · do101.online

Offline use

After the writing page loads, its cached JavaScript can continue working without an internet connection.Read 15 Oct 2026 · do101.online

Praise: free web access

MobilesTalk highlights the free plan and browser availability as the product’s main positives.Read 15 Oct 2026 · mobilestalk.net

Price and trial

DO101 describes its current tools as free to use and says there is no free trial that expires.Read 8 Oct 2026 · do101.online

Privacy processing

Readability analysis runs in the browser and the entered text is not uploaded to DO101.Read 15 Oct 2026 · do101.online

Rating on MobilesTalk

43 out of 100 from 0 reviews (directory index; the page says readers had not yet submitted reviews).Read 15 Oct 2026 · mobilestalk.net

Readability scores

It provides Flesch Reading Ease and five grade-level formulas: Flesch–Kincaid, Gunning Fog, SMOG, Coleman–Liau and ARI.Read 8 Oct 2026 · do101.online

Recommended text length

DO101 says its formulas become more settled with roughly 100 words of input.Read 15 Oct 2026 · do101.online

Rule-based limitation

DO101 explains that browser rule engines catch recognizable patterns but miss context-dependent errors and can flag correct text.Read 15 Oct 2026 · do101.online

Security statement

The privacy policy says local tools have no upload endpoint, so files and text processed there cannot reach DO101 servers.Read 15 Oct 2026 · do101.online

Self-hosting and licence

The reviewed official pages do not state an open-source licence or provide self-hosting instructions.Read 15 Oct 2026 · do101.online

Sentence analysis

It shows sentence-length variance, a colour-coded bar for each sentence and a list of the longest sentences.Read 8 Oct 2026 · do101.online

Sentence chart

Each sentence is displayed as a colour-coded bar whose length reflects sentence size.Read 15 Oct 2026 · do101.online

Sentence variance

The checker measures variation in sentence length, which the named formulas do not report.Read 15 Oct 2026 · do101.online

Storage model

DO101 says writing-tool analysis happens locally and has no upload endpoint; saved citation data stays in browser storage.Read 15 Oct 2026 · do101.online

Support scope

The contact page accepts bug reports, incorrect results, missing-tool requests, privacy questions and accessibility issues.Read 15 Oct 2026 · do101.online

Syllable counting

The checker uses a lookup table for common irregular words and vowel-group rules with silent-E and suffix corrections.Read 8 Oct 2026 · do101.online

Syllable handling

Syllable estimation combines an irregular-word lookup with vowel-group rules and silent-E and suffix adjustments.Read 15 Oct 2026 · do101.online

Writing suite

The checker is one of six free writing tools offered without accounts, uploads or expiring trials.Read 15 Oct 2026 · do101.online

Plans and prices

Every DO101 Readability Checker plan and price →

Where Specifiction places it

• Readability Checkers#6 of 258.4