o365-attack-toolkit vs s3reverse: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros and cons, compared head to head.
o365-attack-toolkit is a free penetration testing tool. s3reverse 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. Independent and vendor-neutral: we never sell rankings.
CST VerdictBased on our analysis of available product data, here is our conclusion:
Penetration testers running Office365 red teams need o365-attack-toolkit because it automates the attack chains most frequently missed in manual testing: password spraying against MFA-less accounts, token theft via API manipulation, and lateral movement through shared mailbox permissions. The 1,116 GitHub stars and active maintenance reflect real adoption by practitioners who've replaced custom scripts with this toolkit. Skip it if your scope is shallow phishing simulations or if your client's O365 tenant has conditional access properly configured; the toolkit assumes weak or absent policy controls that limit its value in mature environments.
Bug bounty hunters and security testers doing S3 reconnaissance will find s3reverse valuable for one reason: it cuts the friction out of converting and normalizing bucket data formats during the discovery phase, letting you spend time on actual findings instead of data wrangling. Free pricing and 86 GitHub stars signal it's battle-tested by practitioners in the field. Skip this if you need an automated bucket enumeration tool; s3reverse assumes you've already identified buckets and just need format conversion for downstream analysis.
