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Security

Last updated 22 October 2026

On this page

1. Our approach2. Every company kept separate3. Who can see your books4. Encryption5. Hosting6. How AI is used7. Checks on every close8. Leaving Closio9. Reporting a security issue

How we keep your books separate, control who can see them, and check every number before it reaches you.

1. Our approach

A company's books hold its bank balances, salaries, vendors and tax position. We treat them that way: kept separate, seen by as few people as possible, and every change traceable.

2. Every company kept separate

Each company has its own books, rules and memory. Nothing learned from one company's books is applied to another's. CA firms see all their clients in one login, but each client's records stay apart.

3. Who can see your books

Only the people your company or firm adds, and Closio's founder, who handles onboarding and support.

4. Encryption

Data is encrypted in transit with TLS, and at rest.

5. Hosting

Closio is hosted in India, and customer data is stored there.

6. How AI is used

Deterministic engines do the arithmetic: matching, totals, tie-outs and statements. AI reads documents and answers questions, and every figure it shows links back to the entry and document behind it. The AI models are OpenAI's, used through its API: OpenAI does not train on this data and keeps it for at most 30 days for abuse monitoring.

7. Checks on every close

Every close runs its tie-out checks before anything is reported. When two sources disagree, Closio raises an exception instead of guessing, and anything unclear is held for a person to decide.

8. Leaving Closio

When an agreement ends, we return your books in standard formats and delete them within 30 days, unless the law requires us to keep them longer. See our privacy policy.

9. Reporting a security issue

If you think you have found a vulnerability, write to [email protected]. Please give us time to fix it before sharing it publicly.

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