Swimm delivers agentic modernization as a service, building and delivering new applications grounded in a verified understanding of legacy systems rule by rule, while making systems ready for agentic development.

How is Swimm different from pointing an AI coding tool at code?

Swimm maps code deterministically first to 100% coverage on supported stacks with expert verification, ensuring complete visibility of flows and rules. AI tools alone read files without seeing whole flows or knowing what they missed.

Which languages and stacks does Swimm cover?

Swimm covers mainframe and legacy languages such as COBOL, JCL and PL/I, as well as modern stacks such as Java and .NET, with coverage details confirmed during the scoping call.

What happens to our code and data?

Work starts under NDA. Swimm can run on-premise including air-gapped environments with customer-managed LLMs, and works from code and schemas never production data.

What does the customer keep after the engagement?

Customers retain the new code, specifications and verified map of their system, which lives in the Swimm platform kept in sync with code changes. Swimm is available for future work at customer request.

Agencies, Studios & Services

Swimm

Agentic modernization delivered through code understanding and application delivery

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Swimm delivers agentic modernization as a service, building new applications grounded in verified understanding of legacy systems and making codebases ready for

About Swimm

Screenshot of the Swimm homepage — Swimm: the homepage

Swimm helps enterprises modernize legacy systems through a service-based approach combining expert engineers and AI agents. The company maps existing codebases deterministically to 100% coverage, creating a verified foundation called the grounding layer that captures all business rules, flows and dependencies. This map is then used to build new applications module by module with tests proving every rule is carried over, and to prepare systems for AI-assisted development through the Swimm platform.

The company covers mainframe and legacy languages including COBOL, JCL and PL/I alongside modern stacks like Java and .NET. All work is conducted under NDA with options for on-premise deployment, customer-managed LLMs and air-gapped environments. After project completion, teams retain ownership of the new code, specifications and the living system map which stays in sync through patented selective updates.

What we found

Grounding layer: deterministic code mapping to 100% coverage with expert verification
System Intelligence: complete verified map of business rules, flows and dependencies
Swimm platform with search, rules, glossary and agent interfaces
One-week grounding sample on code sample before full commitment

Pricing

Pricing model: Contact for pricing

Swimm listing details

Category: Agencies, Studios & Services
Website: swimm.io
Founded: 2019
Stage: Established

Swimm metrics

What we found for swimm.io: Ahrefs Domain Rating and Majestic link details, with changes since the last search.

Domain Rating: 67; +1 (up) since last check
Trust Flow: 15; no change since last check
Citation Flow: 33; no change since last check
Referring domains: 895; no change since last check
External backlinks: 10,104; no change since last check

Ahrefs Domain Rating found 5 Nov 2026, different since 2 Nov 2026. Topic found most: Computers/Hardware (14). Majestic found 26 Oct 2026, different since 26 Oct 2026. Link details found by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

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Swimm domain, found

See what we found

From the registry's public RDAP record, checked 1 Nov 2026, 12:50 UTC.

Domain age: 7 years
Registered: 17 Apr 2019
Expires: 17 Apr 2027
Registrar: GoDaddy.com, LLC
DNSSEC: Signed

Find more on swimm.io

Swimm since launch, found

Swimm went live on Business Listing Finder on 26 October 2026. Here is what our readings show since then.
Measure	At launch, then latest
Domain Rating (Ahrefs)	66 to 67 +1 (up) since launch 26 Oct 2026, then 5 Nov 2026
Trust Flow (Majestic)	15 first measured 26 Oct 2026
Referring domains (Majestic)	895 first measured 26 Oct 2026

Day 9 since launch. Next receipt: day 30, 25 Nov 2026. Readings only: they do not prove what caused a change, and many things can. A metric we have no reading for is left out.

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Common questions

What does Swimm do?: Swimm delivers agentic modernization as a service, building and delivering new applications grounded in a verified understanding of legacy systems rule by rule, while making systems ready for agentic development.
How is Swimm different from pointing an AI coding tool at code?: Swimm maps code deterministically first to 100% coverage on supported stacks with expert verification, ensuring complete visibility of flows and rules. AI tools alone read files without seeing whole flows or knowing what they missed.
Which languages and stacks does Swimm cover?: Swimm covers mainframe and legacy languages such as COBOL, JCL and PL/I, as well as modern stacks such as Java and .NET, with coverage details confirmed during the scoping call.
What happens to our code and data?: Work starts under NDA. Swimm can run on-premise including air-gapped environments with customer-managed LLMs, and works from code and schemas never production data.
What does the customer keep after the engagement?: Customers retain the new code, specifications and verified map of their system, which lives in the Swimm platform kept in sync with code changes. Swimm is available for future work at customer request.

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