libformatstr.py vs Pwntools: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
libformatstr.py is a free penetration testing tool. Pwntools is a free penetration testing tool. Compare features, ratings, integrations, and community reviews side by side to find the best penetration testing fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
Penetration testers who regularly target legacy C applications will move faster with libformatstr.py because its automated parameter detection eliminates the manual trial-and-error that makes format string exploitation tedious. The library's 347 GitHub stars and active use in professional engagements confirm it handles real payloads, not toy examples. Skip this if your work centers on modern memory-safe languages or you need something with a GUI; libformatstr.py is Python-first and assumes comfort reading code.
Penetration testers and red teamers who need to write exploits fast will get the most from Pwntools; its Python library handles the tedious low-level socket work, ROP gadget chaining, and shellcode generation so you spend time on vulnerability logic instead of boilerplate. The 13k GitHub stars reflect real adoption in both professional engagements and CTF competitions, where iteration speed matters. Skip this if your team codes exploits in C or expects a GUI; Pwntools is pure command-line and Python, with a learning curve if you're not comfortable scripting.
