Your text, measured as you type.
A sample council report is loaded. Replace it with your own text, or open a .txt or .md file. Nothing leaves this page.
Summary top sentences, in order
Keywords tap to find in the text
Key phrases by weight
Readability —
*Flesch reading ease and US grade level, estimated from a syllable count.
Tone through the text —
Names and places mentions
Which terms travel together
Two texts, side by side
Paste a second text and see both sets of readings in one table. Compare is part of Pro and Team.
| Reading | This document | Second text |
|---|
Reopen past readings
Six readings from one pass over your text.
Summary
Finds the sentences that best represent the whole text by comparing every sentence with every other one, then keeps them in their original order.
Keywords and phrases
Scores words by how often they appear here and how unevenly they are spread, and joins neighbouring words into phrases.
Readability
Estimates the Flesch reading ease and grade level from sentence length and syllables per word.
Tone timeline
Checks each sentence against a list of positive and negative words, noticing simple negations like “not good”.
Names and places
Collects capitalised names that appear mid-sentence, such as people, streets and organisations, and counts them.
Idea map
Draws the top terms as a network, linked when they share a sentence, so you can see which themes are tied together.
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- The full lab: summary, keywords, readability, tone, names and idea map
- Texts up to 3,000 words
- Save up to 3 reports
- Copy any report
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- Everything in Free
- Texts up to 50,000 words
- Compare two documents side by side
- Save up to 50 reports
Team
- Everything in Pro
- Unlimited saved reports
- Shared reports for up to 10 seats
- Priority support
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Founded by Jennifer.
Jennifer
FounderBuilds Prism to make long documents quicker to read and easier to check.
Language engineer
Open role · remoteImprove how Prism splits sentences and scores words in more languages.
Product designer
Open role · remoteShape how readings are shown, from the lab to shared reports.
Private by design. Nothing is uploaded.
Every reading is calculated by this page, on your device. Close the tab and the text is gone.
- SplitThe text is broken into sentences and words, with common abbreviations kept intact.
- WeighCommon words like “the” are set aside, and the rest are scored by frequency and spread.
- RankSentences are compared by shared words and ranked by how central they are to the text.
- DrawResults update a moment after you stop typing, and the map settles itself into place.