Code documentation for engineers vs product specs for everyone
Swimm and Specsight both treat code as the source of truth for documentation. The difference is who the documentation is for. Swimm writes for engineers reading code. Specsight writes for everyone else.
At a glance
A side-by-side comparison of how Specsight and Swimm handle product behaviour documentation.
Breaking it down
Same insight, different audience
Swimm and Specsight start from the same correct insight: the codebase is the source of truth for what your product does, and documentation should be derived from it rather than written separately. Where they part ways is who the documentation is for. Swimm writes documentation that engineers read while they code. Specsight writes documentation that PMs, support, and stakeholders read while they make decisions.
Tokens vs full regeneration
Swimm uses tokens — references in the docs that point to specific lines of code. When the linked code changes, the doc is flagged as needing review, and engineers update it. Specsight takes a different approach: every release triggers an incremental analysis, and Specsight regenerates the affected scenarios automatically. There's no review queue and no engineer-in-the-loop — the spec just stays current.
Plain language vs code snippets
Swimm docs are markdown files that live in your repository, often with embedded code snippets and technical context. They're excellent for engineering onboarding and for explaining tricky areas of a codebase to other engineers. Specsight scenarios are plain-language statements of behaviour — no code, no syntax, no technical jargon. A customer success manager can read a Specsight spec without explanation. They can't read a Swimm doc the same way.
Different jobs, both useful
A team that adopts Swimm typically still has a documentation gap for non-engineers. A team that adopts Specsight typically still needs onboarding documentation for new engineers. The two tools aren't really competitive — they cover different jobs. The choice isn't Swimm OR Specsight; it's Swimm for engineers AND Specsight for everyone else.
Where Specsight wins specifically
Specsight is the right choice when your documentation problem is non-engineers: PMs who can't tell what shipped, customer success teams answering questions with stale information, stakeholders asking what changed last quarter. Swimm can't help with any of these, because Swimm isn't designed for them.
When Swimm is the right choice
If your primary documentation problem is engineering — onboarding new developers, explaining tricky code, capturing institutional knowledge that lives in the heads of senior engineers — Swimm is the right tool. It's excellent at what it does, and the in-IDE integration makes it part of the engineering workflow rather than a parallel task.
Specsight doesn't try to be Swimm. It doesn't embed in your repo, it doesn't show code snippets, and it doesn't write for an engineering audience. Those are deliberate choices, not shortcomings.
Where Specsight fits in is the documentation gap for everyone else: PMs, support teams, engineering managers explaining the product to stakeholders. Many teams use both — Swimm for engineering knowledge, Specsight for product behaviour.
Who should switch to Specsight
Product Managers
If you want to know what actually shipped — not what was planned — Specsight gives you that without asking an engineer.
Customer Success
If you've ever answered a customer question using docs you weren't sure were current, Specsight gives you a spec you can actually trust.
Engineering Managers
If you're tired of documentation being the first thing to slip in every sprint, Specsight removes it from the sprint entirely.
Frequently asked questions
Are Specsight and Swimm direct competitors?+
Why does the audience matter?+
Does Specsight live in the code repository like Swimm?+
Can we use both Swimm and Specsight together?+
What about the IDE integration Swimm offers?+
How does pricing compare?+
Other comparisons
Documentation that non-engineers can actually read
Connect your repository and Specsight generates a plain-language spec for your PMs, support team, and stakeholders. No code snippets, no jargon — just behaviour.