At 5.30pm on 27 January the accountant, in his fifties, smiles and reaches for his coat. His monitors are off and rain runs down the sash window over a lit high street.

The same desk at 7.40pm: the accountant pinches the bridge of his nose, still working.

For UK accountancy practices

Specialist help that doesn’t hand in its notice.

AI colleagues for bookkeeping, accounts and tax preparation. You review. You approve.

27 January. Same deadline, different evening.

Keep the software you already use.

Xero
QuickBooks
Sage
Bright

Your new team

Good people are hard to find. Harder to keep.

A practice partner stands by an emptied desk: a packed box, a plant, a framed photo and a Good luck! card.

AI colleague

Gracia

Accounting Operations Manager

A clear next step for every piece of work.
AI colleague

Mazal

Bookkeeper

Records prepared. Missing evidence visible.
AI colleague

Sydney

Accounts & Tax Preparer

Working papers you can follow.
AI colleague

Abraham

Accounting Quality Auditor

Another view before your decision.

Specialist capacity that stays. You review. You approve.

The AI behind your team

MrStern

Gracia, Mazal, Sydney and Abraham all run on MrStern: Marvin Works’ own AI.

MrStern is Marvin Works’ own family of UK accounting models: trained in-house, only on synthetic data, and hosted on our own servers. It keeps training as our colleagues take on more work.

Not a public chatbot. Your client data is never used to train, evaluate or ground any model.

Gracia

Mazal

Sydney

Abraham

On a wet London street, a man hands a file stamped Confidential to a stranger in black gloves.

Your clients’ data

You’d never hand a client’s file to a stranger. So why paste it into a public AI chatbot?

Kept on someone else’s servers.
Under terms you don’t control.
Your client never agreed to that.

Your files stay in your own storage.
Kept separate from every other practice.
Never used to train, evaluate or ground any model.

ICAEW guidance on generative AI: respecting client confidentiality means not loading confidential information into public generative AI tools. Source: ICAEW (opens in a new tab)

First stage

Only 100 UK practices will be selected.

A small first group lets us set up and support every practice properly before we open to more.

The accountant laughs with his wife, daughter and son over a Sunday roast at home.

Sunday lunch, not Sunday catch-up.

Add the team that stays. Keep your clients’ data yours.