Free tools
The toolbox, no sign-up
Everything here works without an account. Nothing you enter is stored, and there is no signup wall. They are the checks we run ourselves when a crawl starts behaving oddly.
Proxy tools
Sizing and setup for the pools on this site.
Network tools
What your connection looks like from the outside.
Web tools
Inspect a site the way a crawler sees it.
How to use them
When a crawl that worked stops working
Five questions, in this order. Each one rules out a layer, so by the end you know whether the problem is your client, the proxy or the target.
- 01
Is the traffic leaving where you think?
Load this through the proxy. If the address, country or network is not what you configured, the request never reached the pool and nothing further down matters.
What is my IP - 02
Is something being added in transit?
A proxy that injects or rewrites headers gets a session flagged on the first request. Compare what your client sends against what actually arrives.
Request header viewer - 03
Does the string you are sending say what you think?
A user-agent that claims a browser it cannot back up is the most common self-inflicted block. Decode it and check it is consistent.
User-agent parser - 04
What is the target actually returning?
A 200 with a block page is not success. Check the status, the redirect chain and whether you are being bounced somewhere before the content.
HTTP header checker - 05
Were you asked not to fetch it?
Worth knowing before volume goes up, and worth knowing when a target starts responding differently to one path than another.
Robots.txt tester
Why they are free
No account, no catch
These exist because the same questions come up again and again. Putting them on a page is quicker than answering them one at a time.
No sign-up, no key
Nothing on this page is gated behind an account or a trial. If a tool is useful it is useful before you are a customer.
Your input stays yours
Half of these never send anything to us. The rest keep the result only long enough to render it, and none of it is stored against you.
The same checks we run
This is the sequence our support engineers work through when a crawl that used to run stops running. Nothing here is a lead magnet.
Questions
About the tools
Anything else, ask on Discord or open a ticket.
No. There is no sign-up, no key and no trial. Every tool on this page works the moment you load it, whether or not you buy anything from us.
Only a light one. The three tools that fetch something server-side allow a handful of checks per minute from each address, and every fetch has a short timeout and a size cap, so they are not a load generator. Normal use never gets near it.
The URLs and user-agents you type are not stored. The user-agent parser, the robots matcher and the bandwidth calculator run entirely in your browser, so that input never reaches us at all. The three tools that fetch something server-side hold the result only long enough to render it.
No, and this is deliberate. Any URL that resolves to a private address is refused, as is anything on a non-standard port. Without that, a public tool on our server becomes a port scanner pointed at whatever network it sits in.
Because an open one is an open port scanner. A checker has to connect to whatever host and port it is handed, and unauthenticated that gets used to probe networks rather than to test proxies. The check belongs behind a login, against proxies on your own account.
It is the one our edge sees, which is the same address a target would see on that route. Load it through the proxy you plan to use and it tells you what the exit looks like from outside.
Usually not. Reverse DNS is optional and plenty of residential and mobile ranges have none. A missing ASN means the public lookup did not answer, not that the address is unusual.
Yes. They are free to use for any lawful purpose, on your own sites or on targets you are permitted to test. Nothing here authorises you to access a system you do not have permission to.
Something missing from the toolbox?
Tell us what you keep opening a second tab for and we will build it.
Accounts are for adults 18 and over. Buying means agreeing to the Terms and Acceptable Use Policy.