Automation rules
“duplicative or substantially similar”
No duplicate or near duplicate posts on one account or across accounts you operate. Accounts with different purposes are fine.
Read the policy : Automation rulesDuplicate post checker
Paste two X posts to see how similar they are. Shared phrases light up, a gauge scores the overlap out of 100, and tips show how to make each post stand on its own.
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Duplicate post checker
Phrase length
A28 words
B28 words
Highlighted words appear in the other draft too.
Too close
Large parts are the same. Rewrite before posting both.
15 shared of 37 distinct 3 word phrases
Shared phrases
- Cold starts are 60% faster and you don't have to change
- Relay 2.0 is live
- at relay.dev/2 #devtools
How to diverge
- Both drafts open with the same words. Give each its own first line, since that is what people see first.
- Both end the same way. Vary the closing line or the question you ask.
- Rewrite "Cold starts are 60% faster and you don't have to change" in one of the drafts.
- Both use #devtools. Identical hashtags and mentions across accounts make coordinated posts easy to spot; keep them only where each account would naturally use them.
- Change the angle, not just the words. One draft could lead with the result, another with the problem, a third with a customer or a number.
What X's rules say about duplicate content and multiple accounts
Three published policies cover this. In plain words, as of September 2026:
Copypasta and duplicate content policy
“copypasta”
X limits the visibility of identical or near identical posts. Reposts, and quotes with your own commentary, are not limited.
Read the policy : Copypasta and duplicate content policyAuthenticity
Running several accounts that post the same content, or inflating how prominent a post looks, counts as manipulation.
Read the policy : AuthenticityIn practice: several accounts can cover the same launch, but each needs its own words and its own reason to exist. This checker cannot predict what X will do; it shows where your drafts overlap.
How the similarity score is computed
- 1
Split into words
Lower case, punctuation dropped.
- 2
Make shingles
Every run of three words is one phrase.
- 3
Find shared phrases
Phrases that appear in both drafts.
- 4
Divide
Shared ÷ all distinct phrases × 100.
Draft A
“Our new pricing page is live today”
- our new pricing (shared)
- new pricing page (shared)
- pricing page is
- page is live
- is live today
Draft B
“Our new pricing page went live this morning”
- our new pricing (shared)
- new pricing page (shared)
- pricing page went
- page went live
- went live this
- live this morning
2shared9distinct
× 100 =22Only "our new pricing page" is shared, so the drafts land in the related band: the same news in their own words.
Distinct 0 to 19
These read as different posts.
Related 20 to 39
Same topic, own wording. Usually fine.
Too close 40 to 59
Large parts are the same. Rewrite before posting both.
Near duplicate 60+
Essentially the same post. Do not post both.
How to use the duplicate post checker
- 1
Paste the first draft
Replace draft A with your first post, and rename its label if you like.
- 2
Paste the second draft
Replace draft B with the post for another account or a later date.
- 3
Read the verdict
Check the score out of 100, its band and the shared phrases.
- 4
Rewrite and check again
Rewrite the shared phrases until the score reaches Distinct or Related.
Planning a campaign across several accounts? Add a third draft and the checker scores every pair.
Give each account its own angle
Rewording is the weakest fix. Start from one brief with the facts, then give each account a reason to speak. The words come out different on their own.
Shared brief, identical everywhere
Relay 2.0 · live today · cold starts 60% faster · relay.dev/2
Main brandThe announcement
“Relay 2.0 is live.”
Developer accountHow it works
“Under the hood, 2.0 swaps cold boots for snapshots.”
FounderWhy we built it
“We spent a year on one number: start time.”
SupportWhat to do next
“Upgrading takes one command. Here it is.”
CommunityA question
“What will you build now that cold starts are gone?”
Regional accountThe local detail
“2.0 now runs in our Frankfurt region too.”
No angle of its own? Let that account repost or quote the main post with a comment instead of writing a near copy.
Duplicate content examples, scored
Each pair scored by the checker with three word phrases. Shared words are marked.
41
Too close
Copied with light edits
@northwind
Relay 2.0 is live. Cold starts are 60% faster and you don't have to change a line of code. Upgrade notes are at relay.dev/2 #devtools
@northwind_dev
Relay 2.0 is live today. Cold starts are 60% faster and you don't have to change any code. Read the upgrade notes at relay.dev/2 #devtools
Adding "today" and swapping a few words leaves most phrases intact.
2
Distinct
Same facts, own angle
@northwind
Relay 2.0 is live. Cold starts are 60% faster and you don't have to change a line of code. Upgrade notes: relay.dev/2
@northwind_dev
For the engineers: 2.0 swaps cold boots for runtime snapshots. Our p95 start time fell by 60% in testing. Nothing to migrate. Details at relay.dev/2
The developer account speaks to engineers. Facts, number and link stay the same.
19
Distinct
Same template, different event
@citybikes_london
Docks on the South Bank are closed this weekend for resurfacing. Use the stations on Waterloo Road instead. Back on Monday.
@citybikes_leeds
Docks at the station are closed this weekend for repairs. Use the stations on Boar Lane instead. Back on Tuesday.
Related, not duplicate. A whole feed of these would still read as a template.
Kairo Post runs this check in campaigns: each account drafts its own angle from one brief, and drafts that come out too close are held for a rewrite. More checks live on the tools page.
Duplicate content questions
Does X allow posting the same content on multiple accounts?
No. X's automation rules forbid duplicative or substantially similar content across accounts you operate, and its copypasta policy limits the visibility of near identical posts. Accounts with related but different purposes are allowed if each posts its own content.
What similarity score is safe?
X publishes no number, so no score is officially safe. Our bands are a rule of thumb: under 20 reads as a different post, 20 to 39 is related, 40 or more means large parts are the same.
Can I post the same thing again later on the same account?
X's rules also cover repetitive posting on one account. To bring an older post back, use Repost or quote it with new commentary, which X's copypasta policy names as acceptable.
How is the similarity score calculated?
Each draft is split into overlapping three word phrases, called shingles. The score is the phrases both drafts share, divided by all distinct phrases across both, times 100. This is the Jaccard index.
Why does changing one word lower the score so much?
Each word belongs to up to three phrases, so replacing one word breaks up to three shared phrases at once. Edits in the middle of a sentence move the score most.
Does the checker catch paraphrases?
Only partly. It compares words, not meaning, so two drafts saying the same thing in different words score low. Read your drafts side by side too.
Is my text sent anywhere?
No. The comparison runs in your browser with no sign up and no cost. Nothing you paste is uploaded or stored.
Written by Jonas Ben, founder of Kairo Post. Updated .
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