Modernize the system everyone is afraid to touch.
The old app still runs the business — and nobody can safely change it anymore. Describe what it does, or connect what remains of its code and data, and Evonx rebuilds it as a modern application you can see running in days, not quarters.
Modernization capabilities
Everything between the old system and the new one
Modernization fails when it is treated as one giant migration. Evonx breaks it into verifiable steps — each one visible as a running application, not a chapter in a specification.
Rebuild from behavior, not just code
Describe what the system does — or connect its code and data — and agents reconstruct the workflows, screens, and rules as a modern web application.
Data migration with verification
Customers, transactions, and history move through mapped imports with reconciliation reports, so nothing silently disappears in the cutover.
Parallel running before cutover
Old and new run side by side while real users compare results. You switch when the numbers match, not when a deadline says so.
The integrations the old system never had
Modern APIs, webhooks, and connections to the tools around the system — the export-import ritual ends with the legacy app.
Security and access done properly
Role-based permissions, audit logs, and a supported stack that receives patches — instead of an OS that reached end of life years ago.
Evolution after cutover
The rebuilt system is not frozen at launch. Describe the next change in chat, review the preview, ship it — so it never becomes legacy again.
Agency rewrite, off-the-shelf, or Evonx
Three ways to escape a legacy system
Agency rewrites are priced in senior-engineer years. Off-the-shelf tools cover the generic 80% and abandon the workflows that made your system worth keeping. Evonx rebuilds your rules, at platform economics.
Systems we see modernized
The software that quietly runs the business
Most legacy systems are not mainframes. They are the desktop app from 2009, the agency-built portal whose agency is gone, the Access database with two decades of history. They all share one trait: the business depends on them, and nobody dares change them.
Modernize your application- Desktop applications (VB, Delphi, WinForms) moved to the web
- Aging PHP or classic ASP portals rebuilt on a modern stack
- Access and FoxPro databases turned into real applications
- Vendor-abandoned custom software brought back under control
- Spreadsheet-driven operations consolidated into one system
Related solutions
Rebuild the system, then keep it moving
Modernization is the start. The same platform maintains your website and builds the business software around the core system.
Website maintenance services
Describe the change in chat, review a live preview, ship it — no retainer hours, no ticket queue.
ExploreAccounting software builder
Build a full accounting product—ledgers, workflows, permissions—from a prompt.
ExploreInventory management software builder
Multi-warehouse stock, barcodes, batches, counts, and costing next to your invoices.
ExploreFrequently asked questions
Modernizing legacy applications with Evonx
The original developers are gone and there is no documentation. Can it still be modernized?+
Yes — that is the most common case, not the exception. The old system's observed behavior and its data are the real specification. Evonx rebuilds from what the system does and what it stores, and flags ambiguous rules for your team to confirm instead of guessing.
How long does a modernization take?+
You see a running preview of the first workflows within days. A typical mid-sized business application reaches parallel running within weeks, with cutover timed by when your numbers reconcile — not by a contract date. Large systems are modernized slice by slice, each slice usable as it lands.
What happens to our historical data?+
It moves with you. Data is migrated through mapped imports with reconciliation reports so you can verify counts and balances match before anyone switches. History, audit trails, and archived records are part of the migration, not an afterthought.
Do we have to switch all at once?+
No — you should not. Old and new run in parallel while real users work in both and compare results. Teams typically move one workflow or one department at a time, and the old system is retired only when nothing depends on it.
How does this compare to hiring a modernization agency?+
Agencies price rebuilds in senior-engineer hours, which is why quotes start at six figures. Evonx has AI agents produce the application mass — screens, workflows, validations, reports — while human attention goes to rules, data, and correctness. The result is platform-subscription economics and a first preview measured in days.
Will the new system become legacy again in five years?+
That is exactly what the model prevents. After cutover, every change is a conversation: describe it, review the running preview, approve it. A system that changes easily never accumulates the fear that made the old one legacy.
Stop maintaining the past
Turn the system everyone fears into one you can change.
Describe the legacy application. Evonx rebuilds it — and keeps it evolving.
Start modernizing free