CallHook
trace · inspect · understand
A Windows tracing tool that records a process's calls and their arguments - so you can understand exactly how an application behaves and executes.
Free 7-day trial · Windows 10 / 11 · 64-bit · CLI included: CallHookCli.exe
See it in action
One call, fully traced
CallHook shows each API call a process makes as it happens - the function, the module it came from, every argument decoded, and the value it returned.
Command line
CallHookCli.exe ships with every install
The installer drops CallHookCli.exe right next to the GUI in the installation folder. Same tracing engine, same coverage, no window.
Script & automate
Pipe output into other tools, chain it in a shell pipeline, or drive it from a CI job. No GUI means no user session required.
Headless & remote
Run it over SSH, RDP, or on a server with no desktop. Traces and captures work exactly as they do in the GUI.
Same license
The CLI uses the same license key as the GUI. No separate purchase, no extra activation.
Why CallHook
Everything you need to understand a process's execution
From full call tracing with decoded arguments to auto-attach, filtering and capture-to-disk - built to make an application's behaviour readable.
Full call tracing
Record every call a process makes as it runs and resolve each one by symbol, turning raw
addresses into readable names like CreateFile, RegOpenKey, and
socket and process calls - in the order they happen.
Decoded arguments & returns
Every argument is resolved to a readable value - handles, flags, strings and buffers - alongside the value each call returns, so you see what happened, not just that it did.
Watch & auto-attach on launch
Match processes by name and CallHook attaches the instant one starts - rules persist across runs, so a target is traced before it makes its first call.
Filter & search calls
Narrow the stream to a module, a function or an argument value, and search across the whole trace - so the call you care about is never buried in noise.
Capture to disk
Record full traces to clean, parseable logs - so a run can be replayed, diffed or shared long after the process has exited.
Catches late & dynamic loads
A LoadLibrary re-scan traces modules loaded after attach, and a
GetProcAddress redirect catches APIs resolved dynamically - so nothing slips through
by loading or resolving late.
32- & 64-bit, any target
Attach to either architecture from one UI - a 64-bit GUI drives 32-bit targets and vice-versa - and elevate to SYSTEM for privileged processes.
Many processes, in parallel
Trace multiple processes at once - each gets its own live session, tab and control pipe. A licensed install runs unlimited targets; the trial does one at a time.
Hardened for hostile targets
Every PE header and import table is bounds-checked against the module's SizeOfImage
before it's touched, so tracing malformed or hostile memory never destabilises the host process.
Designed to be functional
Built-in shortcuts and a readable, focused UI to facilitate usability and efficient work.
CLI included
CallHookCli.exe ships in the installation folder alongside the GUI. Same engine, no window - pipe it into scripts, chain it in a shell, or run it headless on a remote box.