Legacy application modernization typically drags on for 18 months while burning budgets and risking catastrophic regressions. Manual reverse-engineering alone consumes 12 to 18 months before developers write a single line of new code. Seventy percent of rewrite projects fail or exceed their budgets. Replay attacks this problem by converting screen recordings of existing applications into working React code and complete documentation, shrinking the extraction phase from months to days.
This system accepts video recordings of legacy software in action. Users capture their old applications running through typical workflows, then upload the footage. Replay's analysis engine watches how the interface behaves across time, tracking state changes as users click buttons, fill forms, and move between screens. This temporal analysis reconstructs not just static layouts but dynamic behavior patterns. The Flow Map feature diagrams multi-page movement paths and detects when application state shifts, creating a visual blueprint of how the legacy system actually functions rather than how outdated documentation claims it works.
The conversion process outputs pixel-perfect React components styled with Tailwind CSS. A 19-step Reimagine pipeline takes the reconstructed UI further by applying modern design patterns while preserving functional logic. The system automatically generates a Design System by extracting reusable components from the legacy interface, cataloging buttons, forms, modals, and movement elements into a shared library. Teams get modular components they can remix rather than monolithic code blocks.
The Agentic Editor provides a search and replace workflow for refining generated components. Developers describe desired changes in natural language and the AI applies them across selected components. Each AI edit consumes roughly 10 credits while a full generation uses approximately 150 credits. Real-time multiplayer collaboration lets team members work simultaneously with live cursors and comment threads visible to everyone. This system also generates API contracts based on observed data flows and creates end-to-end tests covering the workflows captured in recordings.
The free plan provides 300 credits, enough for two generations. It includes preview access and the Flow Map but caps videos at 30 seconds and blocks code export, the editor, and library features. Users stay locked to a single project. The Pro plan costs 19 dollars monthly and supplies 1,500 credits, unlimited projects, full React and Tailwind export, Flow Map access, Design System generation, and AI visual editing. One team member works under this tier. The Agency plan runs 99 dollars monthly with 15,000 credits, seats for five team members, a shared Design System, and priority GPU processing. Enterprise pricing adapts to custom requirements and adds on-premise or private cloud deployment, SSO and SAML integration, security audits with SLA guarantees, and dedicated support channels.
Credit limits constrain how much teams can process. Free users burn through their allocation after two generations. Pro subscribers get ten generations monthly assuming standard credit consumption. Agency teams handle a hundred generations with their 15,000 credit pool. The 30-second video restriction on free accounts prevents meaningful workflow capture since most application tasks span longer sequences.
Development teams modernizing financial services platforms, healthcare record systems, telecom provisioning applications, logistics management software, government technology stacks, insurance claims processors, banking interfaces, manufacturing control panels, retail point-of-sale systems, and energy grid management applications represent the primary user base. These organizations face mission-critical systems built decades ago that can't go offline for extended rewrites but desperately need modern interfaces and maintainable code.