Compare all plans
Log in

Your tax assistant,
available 24/7.

Lunnar is the AI brain that lives in your Aiden Startup dashboard. It understands your accounts, your invoices, your deadlines. Ask it anything: it answers in seconds with full context on your company.

Demo · fictitious data
How much profit do I have this quarter?
Q1 2026: net profit £14.320 (+18% vs Q4). Your revenue grew thanks to 3 new MRR clients. Want to see the full P&L?
See Books
Lunnar AI assistant
Demo

Your whole business online,
in one monthly fee.

Lunnar comes with every plan: ask questions, request reports or send it documents. It replies in seconds and never applies a change without your confirmation.

Demo
Dashboard, WhatsApp, email and Slack · everything logged
Demo
Your dataBooks and dashboard
Lunnaryour answer
With your data · only to answer you
Demo
Draft entrypending your confirmation
Drafts with confirmation · nothing changes on its own

Everything you get,
from day one.

Questions with context

Ask, with your data in front of you.

Demo
What did I spend on software this quarter?
Here it is, by supplier ✓

Reports on the fly

Your numbers, in seconds.

Demo
Quarter summary, on the fly

Preparation with confirmation

It prepares drafts; you decide.

Demo
Invoice received — shall I categorise it?
Yes, go ahead ✓

With your plan

Clearly defined and no surprises.

Lunnar comes with every Aiden Startup plan; the usage limit depends on yours.

Standard plan

500 queries per month; follow-up replies in the same conversation don't count.

PRO Plan

Unlimited queries plus premium channels: WhatsApp priority and Slack.

You control its data

You can restrict what data it sees — for instance invoices only — or switch it off any time from settings.

Talk to Lunnar now

Try 3 real questions to see how Lunnar AI responds about your UK Limited. No card, no email, no commitment.

Lunnar AI
Online · replies instantly
DEMO
Hi 👋 I'm Lunnar, your tax and legal copilot. Tap any of the questions below to see how I respond.
Try one of these:

These answers are real examples. The real Lunnar tailors every response to your company, industry and data in Books.

What it can do,
for you.

Swipe. Tap + for details.

Ask anything
about your company.

"How much did I bill last month?", "When is my VAT due?", "Which clients pay late?". Lunnar sees your data and answers.

What do I owe this month?
Just the Franchise Tax — here is the breakdown ✓

Reports that used to
take you hours.

"Give me a monthly P&L chart for the last year" and Lunnar builds it in seconds, exportable to PDF.

Quarter summary, on the fly

It warns you before
you forget.

Lunnar monitors deadlines (VAT, Corporate Tax, annual report) and gives you advance notice calculated to match your complexity.

CS01
VAT
Alert

Upload a PDF,
Lunnar categorises it.

Send it any invoice or receipt via WhatsApp or email. Lunnar extracts amount, VAT, supplier and date and leaves it prepared in your accounting; you confirm it.

Categorised · Software ✓

WhatsApp, email,
web dashboard, Slack.

Talk to Lunnar wherever you prefer. Every answer stays logged in your dashboard for future reference.

Your data
never trains models.

Lunnar uses your data only to answer you. Encrypted at rest and in transit. We never share it with OpenAI or any third party.

Data
Invoices
Accounts

Your AI assistant,
anytime.

Ask anything about your company: invoicing, deadlines, profits, spend by category. Lunnar answers in seconds with context from your real bookkeeping. Available on the web dashboard, WhatsApp, email, and Slack.

Lunnar, for you,
from day one.

Your AI assistant is active from the moment you form your company. Standard plan with 500 queries/month, PRO plan unlimited + premium channels (WhatsApp priority, Slack).

The intelligence of Aiden,
working with you.

Deployed across all of Aiden Emails, website copy, replies to customers. Lunnar learns how you write and takes over — it almost feels like magic.
Your greatest ally An unpaid invoice, a domain up for renewal, a website running slow. It tells you beforehand, not once it's already a problem.
Sums up what you don't have time for. Forty unread emails become five lines with what you really need to look at today.
Helping you 24 hours a day Even at 3 in the morning, our AI Lunnar helps you by connecting to your account and sorting out your issues on its own
Builds your website with you watching.
Builds your website with you watching. You tell it what you do and it puts together a first version. From there you change it by talking, not by touching code.
And it keeps nothing of yours. What you tell it is used to help you. It doesn't train anyone else's models and isn't sold to anyone.

About Lunnar,
in detail.

What AI model does Lunnar use under the hood?

Lunnar combines several state-of-the-art AI models with proprietary knowledge trained on UK and Delaware tax rules. We route each question to the optimal model based on complexity, so you don't have to worry about it.

Is my bookkeeping data used to train models?

No. Never. Your data is yours. We don't share it with any external AI provider for training. We use APIs with "no-training" settings on every third-party model.

Can I ask it to post accounting entries directly?

Yes. Lunnar can create draft entries that your advisor approves before they're posted. It's conservative by default: it doesn't change anything without your explicit confirmation.

How long do responses take?

Typically <2 seconds for simple questions. Complex reports (an annual P&L with charts) can take 10-30s. If the data isn't in your dashboard yet (e.g. the current month hasn't closed), it'll tell you.

Can I use it in English if my advisor is British?

Yes. Lunnar answers in 5 languages (Spanish, English, French, German, Italian). It auto-detects the language of your question, or you can set a fixed preference in settings.

Does it work on WhatsApp? How do I set it up?

Yes. From your dashboard, you activate the WhatsApp integration in 2 steps: scan a QR code to link your number, and you're done. From there, you message Lunnar's number and get answers with the full context of your company.

Is there a monthly query limit?

On the Standard plan, 500 queries/month (more than enough for normal use). On the PRO plan, unlimited. A "query" is a question or a document processed; follow-up replies in the same conversation don't count.

Can I turn Lunnar off if I don't want to use it?

Yes, anytime from settings. You can even restrict what data it sees (e.g. invoices only, no access to banking). Granular control.

Your first advisor
with no office hours.

Lunnar is included in every plan. Form your company today with Aiden Startup and start asking it questions tomorrow.

See Books too
Examples of common situations

In the words of our founders

What follows are not client testimonials: they are hypothetical examples of situations we commonly handle, using the real terms of the offer.

Coming from Stripe Atlas
Hypothetical example
A founder forms their LLC with Atlas and finds that annual compliance is on them. With Aiden, management, the dashboard and the Spanish-speaking advisor are part of the subscription; official fees are paid separately.
Standard Delaware
Operating fast in the UK
Hypothetical example
Companies House incorporation and Wise Business account managed end to end: the whole process is completed online, with no travel.
100%
process completed online
Standard UK
Documents up to date with Books
Hypothetical example
Invoices and documents are uploaded and organised in Aiden Books through the year, and at year end everything is easy to find to prepare the accounts.
PRO UK
Migrating an existing LLC
Hypothetical example
An LLC formed with another provider moves to Aiden: paperwork is brought up to date and state maintenance resumes from the dashboard.
Standard Delaware
Validating without a Spanish SL
Hypothetical example
To validate a project without the fixed costs of starting a Spanish SL with an accountant, a UK Limited with Aiden runs from €19.99/month plus official fees.
Standard UK
Questions for the advisor
Hypothetical example
Legal and tax questions are handled by the advisor over WhatsApp; on the PRO plan, with a response SLA under 2 business hours.
<2h
WhatsApp SLA · PRO plan
PRO UK
Getting paid with Aiden Pay
Hypothetical example
Client payments run on Stripe from the dashboard: Aiden adds no fee of its own — you only pay the payment provider's fee.
0%
fee added by Aiden
Standard UK
Incorporating from Latin America
Hypothetical example
From Argentina or Mexico, incorporation in the UK or Delaware is 100% remote, with no travel or physical presence, guided from the dashboard.
Standard UK

Hypothetical examples: these are not testimonials or reviews from real clients. The terms quoted (timelines, SLAs, prices) are those of the current published offer.

Start today · no lock-in
Encrypted data AES-256
Compliant with GDPR
Payments by Stripe
We file with Companies House
Support in Spanish
Cancel whenever want

What never changes,
whichever service you use.

One experience, not six tools.
One experience, not six tools. The same dashboard and the same account across every service. Learn it once and you know how to use it all.
Your data is yours.
Your data is yours. We never sell it. You can view it, export it or ask us to delete it whenever you want.
24/7 support, with real people. A real team available any day of the year. No bots and no tickets lost along the way.
Secure without you lifting a finger. SSL certificate, backups and updates always current. It happens behind the scenes, without you asking.
Privacy and security.
Privacy and security. All your data and projects are protected by the latest security technology
Lunnar, your best assistant Our AI runs across the whole platform to help you with anything