The original authors left. Documentation doesn't exist. And production depends on code nobody understands. diffray changes that.
Every team with legacy code knows these nightmares
"This function has been here since 2015. Nobody knows what it does. Don't touch it."
"The contractor who wrote this left 3 years ago. He was the only one who understood it."
"Last time someone modified this file, production was down for 6 hours."
"Why did changing this CSS file break the payment flow?!"
diffray's specialized agents analyze your legacy code like expert archaeologists — uncovering hidden dependencies, implicit contracts, and safe paths forward
Identifies implicit contracts, hidden dependencies, and architectural patterns — even in undocumented code
"This function is called by 47 other files. Changes here will affect payment processing, user auth, and the admin dashboard."
Finds security patterns from a different era — SQL concatenation, MD5 hashes, hardcoded credentials
"This auth check was written before JWT existed. Consider modernizing to prevent session fixation attacks."
Learns the unwritten rules of your codebase and flags when changes violate them
"This module expects dates in MM/DD/YYYY format, but your change uses ISO-8601. 12 downstream consumers will break."
Suggests incremental improvements that won't break existing functionality
"This class can be safely split into 3 smaller modules. Here's a migration path that keeps existing APIs working."
Documents what the code actually does, not what someone hoped it would do years ago
"Based on usage patterns, this function handles timezone conversion for Eastern US users, despite the name 'formatDate'."
AI explains what legacy code does without reading thousands of lines. Get answers about behavior, dependencies, and side effects.
Every PR is analyzed for hidden impacts. Know what will break before you deploy, not after.
Get a roadmap for incremental improvements. Modernize without big-bang rewrites that never ship.
Start understanding it. diffray gives you the confidence to maintain and modernize code that's been untouchable for years.