Compare approaches
Five ways to modernize, compared honestly.
PYD ENTERPRISES extracts specifications. It does not transpile, rehost or write your new system, and several of these approaches pair well with it. Each comparison ends with the cases where the alternative is the better call.
- 01PYD ENTERPRISES vs. manual code auditUse people for judgment and tools for enumeration.
- 02PYD ENTERPRISES vs. generic llm migrationUse language models to describe rules, not to find them.
- 03PYD ENTERPRISES vs. automated transpilersTranspilation moves the code; specification extraction moves the knowledge.
- 04PYD ENTERPRISES vs. rewrite from scratchRewrite the system, not the knowledge.
- 05PYD ENTERPRISES vs. lift-and-shift rehostingRehosting changes where the code runs; it does not change what you know about it.
At a glance
What each approach gives you.
Read across a row to see where each approach is strong. PYD ENTERPRISES' own column is deliberately absent: the detail pages put it side by side with each one.
| Manual code audit | Generic LLM migration | Automated transpilers | Rewrite from scratch | Lift-and-shift rehosting | |
|---|---|---|---|---|---|
| Produces a reviewed specification | Yes, by hand | Unverified prose | No | From interviews | No |
| Covers every executable path | Sampled | Context window | Converted, not explained | No | Unchanged |
| Changes the code | No | Often | Yes, mechanically | Replaces it | Minimally |
| Typical first result | Months | Minutes | Weeks | Months | Months |
| Best at | Business context | Explaining one program | Fast platform exit | Clean design | Platform cost |
Where PYD ENTERPRISES sits
Before the decision, not instead of it.
Every approach on this page has to answer the same question at some point: what does the current system actually do? Manual audits answer it slowly and partially. Language models answer it fluently and without proof. Transpilers and rehosting postpone it. Rewrites answer it late, in testing or in production.
PYD ENTERPRISES answers it first, with deterministic parsing and source-linked rules, so the choice between rewrite, transpile, rehost or buy is made with the rule inventory on the table. Many customers combine approaches: they rehost for cost, then extract specifications to re-architect the parts of the estate that change most.
Stop spending six months reading legacy code by hand.
Run PYD ENTERPRISES on 100,000 lines of COBOL or Java in your private VPC and review OpenAPI specs and DMN tables tomorrow.