Browser extension for X · Chrome and Edge
Fact-check any post on X.
Postsight adds a violet AI badge to every post. Click it to verify, research, summarize, translate or explain the post with your own Claude, OpenAI or DeepSeek key, and see what each answer cost. Hover a wallet address in a post to see who is behind it.
- v1.1.0
- MIT license
- No account
- No tracking
- 12 languages
01 — On every post
What the AI badge does
Click the badge on any post and pick what you need. Each action sees the whole post: the thread, the quoted post, polls, community notes and images.
AIOn every post, next to Grok and the more menu
- 01Verify
- A verdict (accurate, misleading, false, opinion and more), a confidence score, claim-by-claim notes and the sources behind them, using live web search.
- 02Research
- Background, key dated facts, who is involved and where people disagree.
- 03Summarize
- A one-line TL;DR and the substance, including threads, quoted posts, X Articles and linked news pages.
- 04Translate
- Into your language, with links and mentions kept intact.
- 05Explain
- Jargon, references, memes and irony made clear.
- 06Reply ideas
- Three drafts in different tones to copy. Postsight never posts for you.
- 07Ask
- Any question about the post.
- 08Copy
- The text, the link, or a ready-made quote.
02 — Auto routing and cost
A model sized to the job, and the bill in view
In Auto mode, light jobs go to a cheap, fast model and fact-checks to a stronger one with web search. The score comes from the action and the post: its length, thread, images, quoted posts and articles. Or pick a model per post.
Default model per tier
| Tier | Claude | OpenAI | DeepSeek |
|---|---|---|---|
| Light | Claude Haiku 5.5 | GPT-6 Luna | DeepSeek Flash |
| Detailed | Claude Sonnet 5.5 | GPT-6.1 Sol | DeepSeek V4 Pro |
| Hardest | Claude Opus 5.5 | GPT-6 Astra | DeepSeek V4 Pro |
Every tier, the provider order and the prices can be changed in settings.
Know what you spend
- Tokens, web searches, cost and time on every result. Token counts come from the provider's response.
- Monthly budgets per provider, with what is left and roughly how many tokens that buys.
- DeepSeek's live account balance. Anthropic and OpenAI have no balance endpoint for normal keys, so your budget counts down there.
- Saved results are reused, so the same request is not paid for twice.
Built-in prices checked 2026-10-16, in USD per 1M tokens.
03 — Context and languages
Reads what the post points to
A link-only post is not judged by its headline. Postsight reads X Articles from X's public post page and, with your permission, the news and blog pages a post links to. Pages are fetched without your cookies.
12 languages
For the interface and the answers. Translate goes into your language, or into your second language when the post is already in yours.
- enEnglish
- trTürkçe
- deDeutsch
- esEspañol
- frFrançais
- ptPortuguês
- itItaliano
- ruРусский
- ja日本語
- ko한국어
- zh简体中文
- idBahasa Indonesia
04 — Wallet cards
Who is behind an address in a post
Turn on wallet cards and every 0x address and .eth name in a post gets a dashed underline. Hover one for its names, profiles, reputation and security flags; for a token, its market, a test trade and who created it. Public sources only, no key needed, and nothing is sent until you hover.
Checked against the post's author
The card says when the wallet's names, the token's listed X account or the creator wallet's name point to the post's author, and when they point to someone else. An address whose letter case breaks its checksum gets a warning before anything else.
Names, profile links and a token's listed accounts are what their owners published: a match is a hint, not proof.
| What the card shows | Source |
|---|---|
| Every address | |
| Names, checked in both directions, and their records | ENS on Ethereum, Basenames on Base |
| Balance and transactions | Public Ethereum and Base nodes |
| Linked profiles | Name records, web3.bio |
| Reviews and verification | Ethos, Coinbase verification on Base |
| Security flags | GoPlus |
| Tokens | |
| Price, liquidity, market cap, volume, paid listings | DexScreener |
| Score, top holders, the team's links | GeckoTerminal |
| A test buy and sell with the real fees | Honeypot.is |
| Contract checks | GoPlus |
| Who created it | Clanker, Blockscout, GoPlus, GeckoTerminal |
| With your own explorer key (optional) | |
| Creator on any chain, verified contract name | Etherscan or Blockscout PRO |
| When a wallet first transacted | Etherscan |
05 — Privacy
Your keys stay in your browser
There is no Postsight server, no account, no analytics and no advertising. A post leaves your browser only when you run an action on it, and only to the provider you chose.
- Keys
- Kept in the extension's local storage on this device and never synced. The script on x.com cannot read them.
- Requests
- Sent straight to api.anthropic.com, api.openai.com or api.deepseek.com with your own key.
- Pages and wallets
- X Articles, short links and linked pages are fetched without your cookies. Wallet cards send only the address you hover.
- Actions
- Postsight never posts, likes, replies or follows. Reply ideas are drafts you copy.
06 — Install
Install from GitHub
Postsight is free and open source under the MIT license. Install the packaged release, or build it yourself.
From the latest release
- Download
postsight-1.1.0.zipfrom the latest release. - Unzip it.
- Open
chrome://extensionsoredge://extensionsand turn on Developer mode. - Choose Load unpacked and pick the unzipped folder.
- The settings page opens. Paste a Claude, OpenAI or DeepSeek key and press Save key; Postsight tests it and loads the model list.
- On x.com, every post now has a violet AI badge with the Postsight lens, next to Grok and the more menu.
From source
Needs Node 22 or later and pnpm.
git clone https://github.com/yusufky63/postsight.git
cd postsight
pnpm install
pnpm buildThen load the dist folder with Load unpacked. The README has the details.