TOOLS
Twitter and X tools
This tools page gives you a set of small single-purpose utilities for working with X data: resolving handles to permanent numeric user IDs, checking follow relationships between two accounts, counting a post the way X weights characters, and working out engagement rate from raw counts. Each one does a job you would otherwise write a script for, and each page prints the exact API request behind it so you can lift the call straight into your own code.
Twitter ID Finder
live dataTurn a handle or profile URL into the permanent numeric user ID, and turn an ID back into the current handle.
One read call per lookup
Twitter Follow Checker
live dataRead the follow relationship between two accounts in both directions, plus block, mute and DM state where it is visible.
Three read calls per check
Tweet Character Counter
offlineCount a post the way X counts it, with links fixed at 23 and emoji and CJK weighted at 2 against the 280 limit.
Free, runs in your browser
Engagement Rate Calculator
offlineEngagement rate by impressions and by followers, plus amplification and conversation rate, with the formula shown.
Free, runs in your browser
API Cost Calculator
offlineEstimate a monthly bill from your call volume and compare it against the official X API pay-per-use rates.
Free, runs in your browser
What live data means on this page
A tool marked live data reads from X at the moment you press the button, through the same endpoints our API serves to customers. That has a cost, so those tools run on an API key: yours if you paste one, and the answer comes back in the same second. A tool marked offline does arithmetic in your browser and never contacts a server at all, which is why those are free and why nothing you type into them leaves the tab.
If you would rather skip the browser entirely, the quickstart gets you to a first response in about a minute, and the language clients page carries a working client for Python, Node, Go, PHP and Ruby. For agent workflows the MCP server exposes the same endpoints as tools an assistant can call directly.
Frequently Asked Questions
The counting and calculator tools are entirely free and run in your browser, with nothing sent to a server. The two lookup tools call the live API, so each run is a read call billed at $0.0008 on your own key. A new account starts with $0.50 of credit and no card required, which is 625 lookups before anything is charged.
No. The calculators never send anything anywhere, so what you type stays in the tab. The lookup tools send the handle or ID you entered to our own origin, which forwards it once to the API and returns the answer. An API key you paste is used for that single request and is not written to storage, not put in the URL, and not logged.
No. None of these tools ask you to connect an X account, authorise an app, or go through the X developer console. The lookup tools read public profile and relationship data through our API, and the calculators do arithmetic in your browser. If you already hold X developer credentials they are not used here and are not needed.
The tools themselves are pages on this site, but everything they do is one or two documented API calls, and each tool page prints the exact request it makes. Copy the request, add your key, and you have the same capability in your own code with no package to install.