Products we built and run ourselves

Each one works today, and nearly all of them open in a click, without an account. Anything we build for a client belongs to that client and stays private, so these are the fairest way to judge our work.

Our products

Lotmark

Every property enquiry in one inbox, and every sale followed until the transport passes.

Lotmark is built for the daily work of an estate agency in Guyana. Each agency gets its own website, and every listing is ready to share on WhatsApp and social media, with a brochure and a QR code for the signboard. Enquiries from the website land in one inbox on their own, and WhatsApp chats and phone calls can be added by pasting or typing them in. From there, Lotmark matches buyers to listings and keeps track of every viewing, sale and rental, right down to the rent receipts and the owner's statements.

  • Each unanswered enquiry shows how long it has been waiting, turning amber after fifteen minutes and red after an hour. Replying opens WhatsApp with a message already drafted from the agency's own templates, and stops the clock.
  • Each sale follows the steps its kind of title requires. A transport goes through the Deeds Registry, with a notice in the Official Gazette, while a certificate of title goes through the Land Registry and a state land lease through the Lands and Surveys Commission.
  • Every buyer and seller has the client file that anti-money-laundering law requires, and a sale stays flagged until those files are complete. The database itself keeps each agency's records apart from every other agency's, and a copy is stored off-site every night.

Live, with a 14-day free trial, and a demo agency that opens without an account.

Open the Lotmark demo (opens in a new tab)

Kinds of work: Custom software, Automation

lotmark.stratumics.com
Lotmark on a computer, in the demo agency: the inbox, with three new enquiries from people abroad, each showing how long it has waited for a reply. One is open: a WhatsApp chat asking whether the two-flat house in Mon Repos is still available, its price, and whether the transport is clear, with buttons to reply on WhatsApp, call, email or schedule a viewing, and the house itself at G$68,000,000.
Lotmark on a phone: the demo agency's own website, showing a four-bedroom house in Providence, East Bank, for sale at G$85,000,000, about US$408,000 at the agency's rate, above the first of its four photos, marked under offer.
The demo agency. On the computer, a buyer's WhatsApp enquiry is open in the inbox, and on the phone, a house under offer is shown on the agency's own website.

True Cost

Money decisions in Guyana, worked out before anyone signs.

True Cost answers the money questions people in Guyana ask, such as how much of a salary is left after tax and national insurance, what the real yearly rate is on a loan or a hire purchase, what house price an income will support, and what there is to invest in. Ask in your own words, and the assistant runs the right calculator and explains the answer.

  • Every rate comes from a published source and carries the date it was last checked, and the page warns when a figure is more than ninety days old.
  • The assistant never invents a figure. Every number it gives comes from the same tested calculators that anyone can open and run.
  • Each result can be shared as a link, and the preview in a chat already shows the answer.

Live, free, and open without an account.

Open True Cost (opens in a new tab)

Kinds of work: Custom software, Assistants

truecost.stratumics.com
True Cost on a computer: the take-home pay calculator, showing that on G$250,000 a month, G$212,000 comes home after PAYE and NIS.
True Cost on a phone: the assistant, asked what G$250,000 a month takes home after PAYE and NIS, answering G$212,000, with the breakdown from the take-home pay calculator.
The take-home pay calculator on a computer, and the assistant answering the same question on a phone.

Footing

Months of bank statements in one spreadsheet that adds up to the cent.

Footing reads months of bank statements from several accounts, downloaded or scanned, and lists every transaction in one Excel spreadsheet. Each line shows the date, the bank's own description, the money in and out, the running balance, a category, and the page and line it came from. A summary sheet gives the totals by category for each month.

  • Every line is checked against the balances printed by the bank, and each statement has to run from its opening balance to its closing balance, to the cent.
  • When a figure does not match, Footing reads the page again. If it still does not, it tells you which page and line to look at, and holds back the spreadsheet until every statement agrees with the bank.
  • The spreadsheet keeps its sums as working formulas, including the running balance, the monthly totals by category, and a check sheet that adds everything up a second time.

Live and free to try, with three made-up sample statements that open without an account.

Open the Footing demo (opens in a new tab)

Kinds of work: Excel and reporting, Automation

footing.stratumics.com
Footing on a computer, with three sample statements read into one ledger of 108 lines: the Guyana dollar account's July lines, each ticked and marked with the page and line it came from, beside the check, which says all 3 statements add up. July 2026 runs from 1,412,806.45 to 1,890,907.75, August 2026 from there to 2,789,007.60, and a US checking account's August from 2,846.53 to 3,995.53.
Footing on a phone, reading the three sample statements: the scanned July statement is done and adds up, with 35 lines; the August statement is on page 2 of 3, with the page's image, the lines being read marked on it, and the lines read so far listed below; the US statement waits its turn.
The sample statements. On the computer, every line in one list beside the check that each statement adds up, and on the phone, a statement being read page by page.

Particulars

Every date, amount and duty in a contract, with the clause it came from.

Particulars reads a contract, such as a lease, a supplier agreement or an employment contract, and lists every deadline, payment, notice period and obligation in one table, showing who owes what to whom. Choose a row and the contract opens at that clause, with the words marked. The dates can be downloaded to a calendar with reminders, and questions about it are answered from the contract alone.

  • Every row points to the sentence it came from, so anyone can check it in seconds. It shows you what the contract says, and it does not give legal advice.
  • A deadline written as a period, such as six months before the lease ends, is calculated from the dates in the contract, and the working is shown.
  • The contract is read and then discarded, never stored, and a spending limit caps what the free readings can cost each day and each month.

Live and free to try, with three sample contracts and nothing to sign up for.

Open Particulars (opens in a new tab)

Kinds of work: Assistants, Custom software

particulars.stratumics.com
Particulars on a computer: the shop lease's terms in a table beside the lease itself, the monthly rent of G$380,000 chosen and clause 4.1 marked in pink.
Particulars on a phone: the shop lease's dates in order, soonest first, under a button that downloads them as a calendar file with reminders.
The shop lease sample on a computer, with its rent clause marked in the lease, and the same lease's dates on a phone, ready for a calendar.

ExactMark

CSEC maths practice, marked the way an examiner marks.

ExactMark is free practice for the 2027 CSEC Mathematics examinations. A short level check finds where a student stands. After that, a daily session of about twenty minutes teaches the next topic and brings back anything due for review, and timed papers follow both 2027 formats. Every answer is marked for its value and its form, and any mark held back comes with the reason.

  • Students type their answers on a phone the way they would write them, such as 2½, x² or 3(x + 1). An answer that is equal but not factorised, or correct to the wrong number of decimal places, earns part of the marks, with a note of what is missing.
  • Every question is written for ExactMark and made fresh each time, so practice never runs out and no past paper is copied. Before release, each kind of question is generated hundreds of times and checked against its answer, and against the wrong answers that common mistakes produce.
  • Progress stays on the student's phone, with nothing to sign up for. Once opened, it works without the internet, reads questions aloud, and makes a weekly report that a parent can open from a link.

Live and free, with a sample student that opens without an account.

Open the ExactMark demo (opens in a new tab)

Kinds of work: Custom software, Assistants

exactmark.stratumics.com
ExactMark on a computer, for a sample student called Keisha: today's session of about twenty minutes (reviews that are due, a new topic, then mixed exam practice), a grade estimate of IV with the two topics that would raise it fastest, and her readiness for each of the three 2027 modules.
ExactMark on a phone: the question asks to factorise mn − 4m + 7n − 28 completely. The answer m(n − 4) + 7(n − 4) is marked 2 of 3, because it is equal but not yet factorised, with a prompt to write it as a product of brackets.
A sample student's plan for the day on a computer, and a factorising answer marked for its form on a phone.

Rent Receipts

Rent recorded, a receipt sent, and a clear view of who owes what.

Rent Receipts is for landlords. Record a payment and send the tenant a receipt on WhatsApp or by email, with the landlord's own logo and signature. The overview shows what has come in this month, who is late and by how much, and which reminders are ready to send.

  • Part payments, late fees, deposits, rent changes and tenants who share a lease are counted one way everywhere, so the overview, a tenant's statement and the reminders always agree.
  • It works in English and Spanish and in 23 currencies, and every receipt and statement is a PDF the tenant can keep.
  • Everything is saved on the device first and backed up to the landlord's account, and a copy of every account is stored off-site each night.

Live, with a 14-day free trial, and a demo account that opens without signing up.

Open the Rent Receipts demo (opens in a new tab)

Kinds of work: Custom software, Automation

receipts.stratumics.com
Rent Receipts on a computer, in its demo account: the overview, with the month's rent collected against what is due in Guyana dollars, one tenant late with a reminder ready to send, the rent due in the next seven days, and the latest payments.
Rent Receipts on a phone, in the demo account: a receipt for Anjali R.'s rent of GY$ 120,000, ready to send on WhatsApp, with the receipt itself below.
The demo account: the month's rent on a computer, and a receipt ready to send on a phone.

FlatTest

Backflow tests recorded at the valve, with the report ready the moment the test is saved.

In much of the United States, the valves that keep contaminated water out of the public supply must be tested every year. FlatTest is built for the firms that test them, and for the hours they spend in the field.

  • The screen asks for the readings each kind of valve needs, with buttons large enough to press in work gloves.
  • A test is kept on the phone as it is typed, so a dropped signal loses nothing.
  • Customers are reminded sixty, thirty and seven days before each test is due, and again if it goes overdue, in the tester's own name.

Live in the United States, with a free trial and a demo that opens without an account.

Open the FlatTest demo (opens in a new tab)

Kinds of work: Custom software, Automation

demo.flattest.app
FlatTest on a computer, in a demonstration account: the dashboard, counting the tests that are overdue and due soon, above the list of devices that need a test.
FlatTest on a phone, in a demonstration account: a test being logged on a reduced pressure valve, with Pass chosen, above the button that saves the test and makes the report.
A demonstration account: on a computer, the tests that are overdue or due soon; on a phone, a test half entered.

TaxQuarter

Quarterly tax updates for UK sole traders and landlords, built to go straight to HMRC.

From April 2026, sole traders and landlords in the UK with income over £50,000 must keep digital records and send HMRC an update every quarter. TaxQuarter keeps the records, adds them up in the categories HMRC uses, and sends the four updates and the year's final declaration.

  • Every sign-in asks for a code from an authenticator app, because HMRC's rules ask filing software to report how each person proved who they are.
  • Every message to HMRC carries the sixteen pieces of fraud prevention information the law requires, and HMRC's checker finds no errors in them.
  • Money is kept in whole pence and every deadline comes from HMRC, so nothing is rounded or guessed on the way.

Built, and filing to HMRC's test service while HMRC is not accepting new filing software for 2026 to 2027.

Open the TaxQuarter demo (opens in a new tab)

Kinds of work: Custom software, Excel and reporting

taxquarter.stratumics.com
TaxQuarter on a computer, in the demonstration account: a gardener's second quarterly update before sending, with turnover of £24,770.00 and expenses of £8,902.37 giving a profit to date of £15,867.63, beside the first update as sent in July, and the deadline, 7 November 2026.
TaxQuarter on a phone, in the demonstration account: the year's deadlines from HMRC, with the first quarterly update sent on 28 July for the gardening business and the let flat, and the second ready to send, due 7 November 2026.
The demonstration account: on a computer, a quarterly update checked before sending; on a phone, the year's deadlines from HMRC.

Habla

Two people with no language in common, talking through one phone.

Tap, say something in English or Spanish, and a few seconds later the other person hears it in their own language, in a natural voice. The language is worked out from the words, so nobody has to choose one.

  • It takes about five seconds from letting go of the button to hearing the translation, and every line stays on screen in both languages.
  • Its Spanish is the Spanish spoken in Cuba: tú, carro and celular, the words the other person uses.
  • The conversation stays on the phone. The server keeps timings and sizes, never the words.

Private, behind an access code. Its front page plays an exchange recorded through the app.

Open Habla (opens in a new tab)

Kinds of work: Custom software

habla.stratumics.com
Habla's front page: the headline Talk across English and Spanish, on one phone, beside the app's screen with a three-line exchange, English to Spanish, Spanish to English, English to Spanish.
Habla on a phone mid-conversation: three lines, each in both languages, the last being read aloud in Spanish, above the Talk button.
The front page replaying an exchange recorded through the app, and the app on a phone, mid-conversation.

Smaller builds for our own use

Each runs on private records or a live camera, so each is drawn here with sample data.

A spoken briefing every evening

At half past eight it gathers the day from every system, writes it up in plain words and sends it as a voice note, with whatever needs attention first. If something fails, the briefing says so.

Tonight's briefing: the day's sales, one invoice overdue, and a backup that needed a second try.

Forty-one public sources, read every two hours

It reads government notices, tenders and the news, including scanned pages, and keeps every item with its history. Anything urgent comes through at once, and the rest waits for the morning summary.

This morning's digest: two tenders that match, and a notice read from a scanned page.

Answers from every past working session and note

Ask a question, such as what was agreed about a delivery charge, and it gives the answer, the date it was decided and the note it came from.

Asked about the Linden delivery charge, it answers with the figure, the date and the note it came from.

A photo on the phone the moment a car stops at the gate

A camera watches the gate and sends the picture when someone walks in or a car pulls up and stops. Passing traffic and cars already parked never set it off.

A car pulls up and stops at 18:42: the alert carries the whole frame and a close-up.

Data tools

We also build and run tools that collect what public websites show to any visitor, such as the businesses listed on a map or the reviews of an app, and give it to you as a spreadsheet. Anyone can use them, and the most common jobs each have a guide.

See the data tools
NextResearch in mathematics and financeWe find new results on unsolved problems in mathematics, and we model the interest rates that mortgages and company bonds are priced from.

Tell us what you want built

A few sentences in your own words are enough to start, and they stay between us. We will reply with our questions, then send a written plan and a fixed price.

Start a project

Or write to hello@stratumics.com