The AI reads everything
Each item goes to your AI, which works out what it is: a receipt to book, a letter to keep, a customer to answer.
Longtom keeps the shop
while you build the product.
A company to register, a return to file, a receipt to book, a customer waiting on a reply. None of it is why you started. Longtom runs on your machine and has your AI do that half.
Coming soon To the Microsoft Store. See the guide
Put it in the inbox. Press Process.
Receipts, invoices, letters from the tax office, a contract, a photo of a bill. Drop them in the Longtom Inbox on your desktop. Mail, texts, voicemail and bank lines arrive on their own.
Longtom does what it decides
Books the expense, files the document under a name you can find, opens the ticket and drafts the reply.
Once a day, or as it arrives
Press Process when you sit down, or leave it running and it deals with things as they come in.
Three things
Setting up
What to trade as, which registrations, in what order, and which one blocks which. Done once, then finished.
Your country's thresholds, deadlines and authorities are held in the product, each with the date it was last checked against the authority itself.
Bookkeeping
Bank statements in, receipts read out of your mail, rules learned as you categorise, a trial balance out, and the return prepared in the authority's own labels.
You lodge it yourself, at your authority's own portal. Every figure says which ledger lines it came from.
Support
A customer writes in. The message is classified, attached to whoever sent it, reproduced against your repository, and a fix comes back as a branch with a reply drafted beside it.
Routine replies go out on their own. Anything less clear-cut waits for you, with the reason on the ticket.
It uses the AI you already pay for
No model of its own, no API key wanted. It runs the coding CLI already on your machine — Claude Code, Codex, GitHub Copilot, Cursor, Antigravity and nine more, or your own command — under your own subscription.
Most of it never asks a model
Rates, deadlines, fees and the order of the steps are compiled in, each with the date it was last checked against a primary source. So you get the same answer every time, at once, with none of your own subscription spent on it.
The model is for what needs one: reading documents, reconciling a feed, drafting a reply.
One folder on your own disk
It holds the database, the documents and the backups. Secrets sit in a separate encrypted vault the database never sees. There is no account, and nothing of ours holds your books in a form we can read: they are somewhere you can copy, move or delete without asking anybody.
Backups go to your own OneDrive, and a new computer finds them and brings everything back in one click. Lock the app with a PIN if you like.
77 countries, each one actually known
Listing a country is a claim: the tax and its rate, the registration threshold, the return's name and its real due dates, which authority issues what, and the privacy law. Anything less is not offered.
Albania TVSH (VAT)
Argentina IVA (Impuesto al Valor Agregado)
Armenia ԱԱՀ (VAT)
Australia GST
Austria USt (Umsatzsteuer)
Bangladesh মূল্য সংযোজন কর (VAT)
Belgium BTW / TVA (belasting over de toegevoegde waarde / taxe sur la valeur ajoutée)
Brazil
Bulgaria ДДС (DDS, value added tax)
Canada GST/HST
Chile IVA (Impuesto al Valor Agregado)
Colombia IVA (Impuesto sobre las Ventas)
Costa Rica IVA (value added tax)
Croatia PDV (porez na dodanu vrijednost)
Cyprus ΦΠΑ (VAT)
Czechia DPH (daň z přidané hodnoty)
Denmark moms (merværdiafgift)
Egypt ضريبة القيمة المضافة (VAT)
Estonia käibemaks
Finland ALV (arvonlisävero)
France TVA (taxe sur la valeur ajoutée)
Georgia დღგ (VAT)
Germany Umsatzsteuer
Ghana VAT (Value Added Tax)
Greece ΦΠΑ (FPA, value added tax)
Hong Kong
Hungary ÁFA (általános forgalmi adó)
Iceland VSK (virðisaukaskattur)
India GST (Goods and Services Tax)
Indonesia PPN (Pajak Pertambahan Nilai)
Ireland VAT
Isle of Man VAT (value added tax)
Israel מע"מ (ma'am, value added tax)
Italy IVA (imposta sul valore aggiunto)
Japan 消費税 (consumption tax)
Jersey GST (goods and services tax)
Kazakhstan ҚҚС / НДС (VAT)
Kenya VAT (Value Added Tax)
Latvia PVN (pievienotās vērtības nodoklis)
Lithuania PVM (pridėtinės vertės mokestis)
Luxembourg TVA (taxe sur la valeur ajoutée)
Malaysia SST (Sales and Service Tax)
Malta VAT (Value Added Tax)
Mexico IVA (Impuesto al Valor Agregado)
Moldova TVA (VAT)
Morocco TVA (value added tax)
Netherlands btw (omzetbelasting)
New Zealand GST
Nigeria VAT (Value Added Tax)
Norway MVA (merverdiavgift)
Pakistan
Peru IGV (Impuesto General a las Ventas)
Philippines VAT (Value Added Tax)
Poland VAT (podatek od towarów i usług)
Portugal IVA (Imposto sobre o Valor Acrescentado)
Romania TVA (taxa pe valoarea adăugată)
Rwanda VAT (value added tax)
Saudi Arabia ضريبة القيمة المضافة (VAT)
Serbia PDV (porez na dodatu vrednost)
Singapore GST
Slovakia DPH (daň z pridanej hodnoty)
Slovenia DDV (davek na dodano vrednost)
South Africa VAT
South Korea 부가가치세 (value added tax)
Spain IVA (Impuesto sobre el Valor Añadido)
Sri Lanka VAT (value added tax)
Sweden moms (mervärdesskatt)
Switzerland MWST / TVA (Mehrwertsteuer / taxe sur la valeur ajoutée)
Taiwan 營業稅 (business tax)
Thailand ภาษีมูลค่าเพิ่ม (VAT)
Türkiye KDV (Katma Değer Vergisi)
Ukraine ПДВ (VAT)
United Arab Emirates VAT
United Kingdom VAT
United States
Uruguay IVA (VAT)
Vietnam Thuế GTGT (value added tax)
Where no tax is named, the country levies none, levies it state by state, or is mid-transition — the profile says which.
The ones missing are a to-do list. Country data updates on its own, so a rate that moves does not wait for a new version.
Price
Free until you earn
Nothing to pay while you set up. A hundred days after your first income it is US$99.99 a year, or US$11.99 a month, through the Microsoft Store.
Stop paying and you keep everything: books, invoices, documents, exports. Only the corrections and new work stop.
Online backup, if you want it
US$39.99 a year or US$4.99 a month. An encrypted copy of your books and documents, up to 5 GB, that only your recovery key opens.
Copying the folder to OneDrive, Google Drive or Dropbox is free and always works.
Where it stops
Never payroll. Never an accounting package. Never multi-user.
Longtom is for a business of one. That is the whole product, not a stage on the way to something bigger.
Leaving is designed
Outgrow it and you move to your country's usual accounting package. The ledger exports OFX, and each country profile names the packages an accountant there will accept.
The records pack is one zip an accountant or a tax office can read.
Coming to the Microsoft Store
Read the guide to see everything it does.