Claude can do the work. Kvantia makes it safe to hand over.
This page is for one specific question: you already use Claude, it is already capable — so what does Harness add? The short answer is the boundary around the work, not the work itself.
Not a replacement
Harness sits around the model, not in front of it
Kvantia Harness is not another chat interface and not a model of its own. You keep using Claude — or GPT, or whichever provider you connect — for the reasoning. Harness is the layer that decides what that reasoning may touch, where it must stop and ask a person, and what evidence is left behind when it finishes.
If you already trust Claude to draft, analyse and use tools, the open question is rarely capability. It is whether you can hand over a recurring business process — one that touches customer data, money or a system of record — and still be able to say afterwards exactly what happened and who approved it.
Side by side
What changes when Harness is around the work
| Claude on its own | With Kvantia Harness around it | |
|---|---|---|
| What does the thinking | Claude analyses, drafts, uses tools and completes the task you give it. | The same model, unchanged. Harness never replaces the reasoning. |
| Where it runs | In Anthropic’s service, reached from your browser or the desktop app. | On one Windows PC your business controls. Routines, policy, credentials and the record live there. |
| What it may touch | Whatever you have connected to your account or opened in the conversation. | Only the sources and actions a given routine is granted. Everything is off until you switch it on, and permission is set per routine — not once per person. |
| Who stops a risky step | You do, while you are in the conversation watching it work. | The policy you wrote. Sending, spending, deleting and signing wait in an approval queue — including at 03:00, when nobody is watching. |
| Where credentials live | In the connector or account setup you configured. | With a local broker on the machine. The tool uses the key; the key never enters the model context. |
| What proof is left | The conversation, plus whatever logging your plan and admin settings provide. | A local audit receipt for every run: what was asked, which sources were read, what was proposed, who approved, what changed and when. |
| Unattended runs | Depends on your plan and which features you have enabled. | Scheduled routines with retries, resume after a restart, and a visible “needs attention” state when something stops. |
| Which model | Claude. | Whichever you connect — Claude, GPT or another provider. Your rules do not change if you switch. |
| What it costs | Your Anthropic subscription or API usage. | €49 a month or €490 a year for one PC, on top of your provider’s usage — billed by them, at their price, with no markup from us. |
This compares the boundary, not the model. Claude’s own capabilities and controls change quickly and differ by plan, so check Anthropic’s current documentation for what yours includes. Everything in the right-hand column is what Harness adds around whichever model you connect: how the loop works · where information goes.
The fair objection
Could you build this without Kvantia? Yes.
Nothing here is magic. A capable engineer can wire a scheduler, a secret store, a permission layer, an approval screen and a log around a model API — and some teams should.
What they then own is the part nobody budgets for: the retries when a source is down, the resume after a restart, an approval screen a non-technical colleague can actually read, an audit format an accountant will accept, and the maintenance every time a provider changes something underneath.
Harness is that assembly, already built and maintained, for one subscription. If your team would rather build it, build it — and keep the same four rules either way: permission per routine, approval before anything irreversible, credentials outside the model context, and a record you can read afterwards.
The honest test
Test it on one routine you already repeat every week.
Take a process your team runs on a schedule — the Friday report, the month-end check, the recurring reconciliation — and run it end to end with the approval queue and the audit trail in view. That is a far better answer than any comparison table, including this one.
€49 a month or €490 a year for one PC, with a 14-day free trial. Card payment only. Cancel anytime.