Swimm
Agentic code understanding and modernization for large legacy codebases
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About Swimm
Swimm is a different product than most people remember. If you last looked at it as a Notion-for-code plugin that keeps snippets in sync, the current pitch is an agentic modernization offering with fixed-price stages, support for COBOL, JCL and PL/I, and air-gapped deployment. Judged on its public materials, that is a services-plus-platform play for banks, insurers and other organizations sitting on systems nobody fully understands. The strength is focus: a persistent context layer over very large codebases that other agents can query over MCP, sold in stages you can price before committing. The limits are equally clear. There is no self-serve plan, no public price list and no free tier, so you cannot try it on a weekend project, and a small team that only wants better onboarding docs will find it heavier than needed. Because it is quote-based on lines of code, budgeting requires a sales conversation. Recommendation: enterprises with real legacy or mainframe exposure should shortlist it and start with a proof of concept on their own code. Startups and small teams wanting living docs should look at Mintlify, Confluence or Pieces instead.
Swimm started as a tool for writing documentation that stays coupled to code, and has since repositioned as an agentic modernization company for large, legacy and mainframe-era codebases. Its platform analyzes source code, builds a persistent context layer of how systems actually work, and uses that to support assessment, specification, migration and team enablement. It reports having analyzed more than 100 million lines of code.
Delivery is structured as fixed-price stages: Assessment, Specification, Modernization and Enablement. The product is API-first, supports COBOL, JCL and PL/I alongside modern languages, can run on-premises or air-gapped, and exposes its context layer to AI agents through MCP. SOC 2 and ISO 27001 cover security requirements for regulated buyers.
Swimm is aimed at enterprises, banks, insurers and other organizations carrying decades-old systems that nobody fully understands. It is not a lightweight team wiki or an IDE autocomplete tool; it is a services-plus-platform offering for large migration and knowledge-recovery projects.
Key Features
- Agentic analysis of large legacy codebases with a persistent context layer
- Staged delivery: Assessment, Specification, Modernization, Enablement
- Coverage for COBOL, JCL and PL/I alongside modern languages
- API-first architecture with MCP access for AI agents
- On-premises and air-gapped deployment options
- Code-coupled documentation that updates as code changes
- SOC 2 and ISO 27001 compliance
- Analysis proven on more than 100 million lines of code
Pros
- Purpose-built for hard legacy and mainframe modernization problems
- Fixed-price staged delivery makes large projects easier to budget
- On-prem and air-gapped options suit regulated industries
- Context layer can feed other AI agents through MCP
- Strong security certifications for enterprise procurement
Cons
- No public pricing or self-serve free tier
- Overkill for small teams that only need internal docs
- Heavier engagement model than an IDE plugin or wiki
- Messaging has shifted from documentation to modernization, which may confuse earlier users
Pricing
Swimm does not publish list prices. Engagements are scoped by the size of the codebase, measured in lines of code, and delivered in fixed-price stages rather than per-seat subscriptions.
Buyers typically start with an Assessment or a proof of concept to validate the approach on their own code, then move to Specification, Modernization and Enablement stages as scope is agreed. Contact the sales team (info@swimm.io) for a quote.
There is no self-serve plan or free tier currently advertised, so earlier per-seat figures seen on third-party sites may be outdated. Confirm current terms with Swimm directly.
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Frequently Asked Questions
Swimm analyzes large codebases, builds a context layer of how they work, and supports assessment, specification, migration and enablement for legacy modernization.
No free tier is advertised. Pricing is quote-based and tied to lines of code, with proof-of-concept options.
It covers legacy languages such as COBOL, JCL and PL/I as well as modern languages.
Yes. Swimm offers on-premises and air-gapped deployment for security-sensitive organizations.
It began as code-coupled documentation, but its current positioning is agentic modernization with documentation as one output.
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