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Swimm

Legacy modernisation as a service: static analysis first, then AI and senior engineers.

4.1 Coding
4.1 Very good 4.1
Static analysis gives checkable ground truth before the model acts No amounts published for any of the four stages
Reviewed by Challenging Voice Editorial · Updated Aug 2026 How we rate
PricingContact for Pricing
Free planNo
CompanySwimm
PlatformsWeb
CategoryCoding
Last reviewedAug 2026
Ask AI about Swimm ChatGPT Claude Perplexity

Overview

Swimm modernises legacy systems, mainframe, .NET, Java and monoliths, by first building a structured, traceable understanding of the code through deterministic static analysis, then applying AI transformation and senior engineers on top of that map. Dead-code analysis, architecture mapping and an MCP-queryable knowledge base come with it.

Putting deterministic analysis before the AI is the important ordering. A model asked to migrate code it has only read will confidently produce something plausible, and in a mainframe migration plausible is catastrophic. A static map is checkable ground truth, and it is what makes the audit readiness these customers need possible at all.

Engagements run in four fixed-price stages, Assessment, Specification, Modernization and Enablement, with a live customer workspace and on-premises or air-gapped deployment. No amounts are published for any stage. This is a services engagement rather than software you adopt, modernisation projects fail on organisational reasons more often than technical ones, and a fixed price per stage still means committing stage by stage.

Key features

  • Deterministic static analysis before any AI transformation
  • System understanding and architecture mapping
  • Dead-code analysis
  • MCP-queryable knowledge base
  • On-premises and air-gapped deployment

Screenshots & demo

Swimm screenshot 1

Pricing

Swimm uses custom pricing. Contact their team for a quote based on your needs.

  • Pricing modelContact for Pricing
  • Starting priceCustom
  • Free planNo
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Pricing is provided as a guide. Check the official site for the latest plans.

Pros & cons

Pros

  • Static analysis gives checkable ground truth before the model acts
  • Audit readiness built into the approach
  • Air-gapped deployment for regulated estates

Cons

  • No amounts published for any of the four stages
  • A services engagement rather than software you adopt
  • Modernisation fails organisationally more often than technically

How it compares

ToolRatingFreeFromBest known for
Swimm (this tool)4.1No—Deterministic static analysis before any AI transformation
IBM watsonx Code Assistant4.1Yes$2/moAutomated modernization recommendations for legacy Java and mainframe COBOL
UFT One3.7No—AI object detection and mockup identification
Code Metal4.0No—Formal verification proving functional equivalence, not just plausible output

Alternatives to Swimm

3 tools matched to Swimm on what they do, their category and their price.

UFT One

3.7

AI object detection and self-healing tests cut maintenance across desktop, web, mobile, and mainframe testing – the AI Transformation Assistant modernizes legacy scripts.

Contact for Pricing Coding

Frequently asked questions

What is Swimm?
Swimm modernises legacy systems, mainframe, .NET, Java and monoliths, by first building a structured, traceable understanding of the code through deterministic static analysis, then applying AI transformation and senior engineers on top of that map.
Is Swimm free?
Swimm does not offer a free plan.
What are the best Swimm alternatives?
The closest matches in the directory are IBM watsonx Code Assistant, UFT One, and Code Metal, compared side by side above.

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