Five apps · Built in the UK · No adverts, on any tier

Tools that do the arithmetic, apps that help you learn, and keep the record.

Small, careful apps for the parts of working life that come down to sums and records. Price a job and send the quote. Keep a year of expenses straight for the return. Keep the book on what you traded, and what it came to.

See the apps What each one does with your data

Free to start. No adverts, on any tier. Nothing about you is sold.

Quote · No. 0418ex VAT

Labour, 14 hrs at £42588.00

Materials212.40

Mileage, 96 mi at 45p43.20

Total£843.60

WORKED ON THE PHONE · SHOWS ITS WORKING

The apps

Built for the jobs you do often enough to deserve a proper tool.

Opened on a phone, in the middle of the job. Quick to reach. Working shown. Nothing asked for that is not needed. Each app says below what it keeps, and where.

1001 Pro Calculators and Tools

The best all-in-one calculator app you will have: offline, no ads, and it doesn't collect any data. Price a job, send the quote, work out anything, on your phone.

Works offline
No account
No permissions, not even internet

1001 calculators, 250 free forever. Mortgage, tax, VAT, loans, materials, health, across 28 categories, each with its working shown.
Quote a job in five minutes. Itemised quote, estimate or invoice on your own letterhead. Out as a PDF, or into WhatsApp as an image.
Nothing you type leaves the phone. No account, no analytics, no crash reporting, no permissions at all.

Live on Google Play and the App Store

Free tier forever. Pro: a 7-day free trial through Google Play or the App Store, then £0.99 for the first year and £2.99 a year after. Trade Tools: £9.99, once. More about 1001 Pro Calculators and Tools.

The app's own Age calculator, worked out in your browser. Nothing you type is sent anywhere.

CandleWatch

Your trading year, worked out in full. Track your trades, work out your UK capital gains, and study the market.

Your book works offline
Market data needs a connection
No account unless you choose the hosted service

It starts with what you already did. Every leg, fee and currency conversion, booked at the rate on the day. Every figure shows its working.
The tax year, worked out. UK capital gains from that record, the reasoning shown against each disposal, and an export at the end. A computation you can check, not tax advice.
A desk for reading the market. Charts, indicators, breadth and company filings, each shown with what it rests on. A learning tool, not a tipping service.

Coming toGoogle PlayComing toApp Store

Closed testing

Free, with no adverts and no in-app purchases at launch. Not a broker: it places no trades, holds no money and files nothing. The full picture is at candlewatch.co.uk. More about CandleWatch.

Rihal: Quran and Hadith

The Quran and the major hadith collections, free, with every source shown. Quran, recitation, hadith, prayer times and qibla. Free, no ads, sources shown.

Free, no paid features
No account
The full app runs in your browser

The Quran, checked letter for letter. Against the King Fahd Complex, Tanzil and Quran.com. Translation, tafsir, word by word, tajweed in colour and sixteen reciters.
More than 36,000 hadith, every grade named. Bukhari, Muslim, the four Sunan and the Muwatta in Arabic, English and Urdu, searchable in all three, with the scholar behind each grade.
Prayer times and the qibla, worked out on your device. Eighteen calculation methods, the Hanafi or majority Asr, and mosques near you. Your location is not sent to us.

Open the full app

Coming toGoogle PlayComing toApp Store

Work in progress · full app on the web

Free, with no adverts and no paid features. While the phone app is finished, the whole of it runs on this site. More about Rihal: Quran and Hadith.

Simply: Bills, Subs & Splits

Every bill and subscription in one place, split fairly. Track bills and subscriptions, split them with your household, and settle up.

Works offline
An account only if you want one
No bank login, ever

See what is coming. Rent, energy, phone, streaming, the gym: one list, a calendar of what is due, a warning before a free trial becomes a charge, and another before a contract ends and the price goes up.
Split it your way. Equally, by percentage, by shares, by income or by exact amount. A running tally of who owes whom, the fewest payments that clear it, and every amount you can take apart to see where it came from.
It never touches your money. Costs are added by hand, read from a receipt you photograph, or found in a statement you downloaded. A household you share is kept on a server in London, for its members and no one else.

Coming toGoogle PlayComing toApp Store

In development

Free tracks up to 10 bills and subscriptions at once. Pro adds more than one household, price-rise alerts across everything you track, trend reports and calendar sync. One price for you, or one for the whole household — cheaper per person the more of you are in it. More about Simply: Bills, Subs & Splits.

Sole Trader: Tax & Invoices

Keep the records. Keep them straight. Invoices, expenses, income and mileage for your UK self-assessment. Offline.

Works offline
Encrypted on the phone
Sign-in optional · copy held in the EU

Invoices that meet HMRC's rules. Raise one on the phone, send it as a PDF, and the income lands in the right tax year.
Photograph a receipt. Nothing is uploaded. Amount, date and shop are read on the phone and filed under HMRC's own categories.
Mileage at HMRC's rates. Record a trip as you drive, or type the miles in later. Bank statements you download are read on the device. No bank login.

Coming toGoogle PlayComing toApp Store

In development

Free, with no entry limits. Pro adds tracking more than one trade or business, automatic trip recording, PDF summaries and year-on-year comparison. It does not file with HMRC; it gives you the figures to file with. More about Sole Trader: Tax & Invoices.

Your data

There are no adverts, on any tier, and nothing about you is sold, shared or handed to an advertiser.

True of every app here. Beyond that they differ, and each says so in its own words. This is the short version; the privacy policy on each app's page is the full one.

With you

Your figures and your working

Your invoices, receipts and trips

Your bills and who owes what

Your trades and your book

Not anywhere

Adverts, on any tier

Analytics or tracking

An advertising identifier

A bank login

Everything on the left stays on your phone unless you choose to sign in. Where that is offered, the table says where the copy is held.

Used on its own, no app here has an account. Where one is offered it is optional and does one thing: it lets your records follow you to another device. Choose it and the app says where that copy lives. Decline it and, for most, the app makes no request in your name at all.

None of them connects to your bank. None moves money, places a trade or files with HMRC. They keep the record, do the arithmetic and show the working.

The product rankings are the one part of this site that earns from advertising. Their shop links are affiliate links: to Amazon (as an Amazon Associate I earn from qualifying purchases) and to shops such as Machine Mart and Tyres UK through the Awin network. If you buy through one, the shop pays us a commission at no cost to you; it never changes a ranking. The shop learns only that you came from our link: we pass it nothing about you, and the rankings set no tracking cookies of their own. How these pages earn.

Get the apps

App	Works with no signal	Account	If you sign in, the copy is held	What it asks the phone for
1001 Pro Calculators and Tools	Yes, all of it. The same in flight mode as on full signal.	None.	Nowhere. There is no copy.	Nothing. Not even internet.
CandleWatch	Your book, yes. Trades, fees and the capital-gains computation. Market data, no. Prices, filings and news are fetched when you ask.	Only for the hosted service, which keeps your book on the server so it follows you to a browser.	On the CandleWatch server, against your account. Export or delete it at any time.	Notifications and background checks, for the alerts you set. No location, camera, microphone or contacts. A market-data or AI key you add goes to that provider, never through us.
Rihal: Quran and Hadith	On the phone, yes. The Quran, hadith and prayer times are in the app. The web version needs a connection to open.	None. There is no sign-in of any kind.	There is no copy. Everything stays on the phone, or in your browser for the web version.	Location, only if you choose it, for prayer times, the qibla and mosques. Notifications, for prayer alerts on the phone.
Simply: Bills, Subs & Splits	Yes. Everything you enter, and every reminder.	Only to share a household, or to keep a copy so your data comes back on a new phone.	In London, for that household's members and no one else.	Notifications, for reminders. It fetches a brand's logo and, with more than one currency, an exchange rate. Neither request says what you pay.
Sole Trader: Tax & Invoices	Yes, all of it. Receipts are read on the device.	Optional. Records stay on the phone whether you sign in or not — signing in only adds a synced copy on another device.	In the EU, so you can pick up on another phone. On the phone, records are encrypted with a key in the Android Keystore or iOS Keychain.	The camera, for receipts. Location, only while recording a trip and only if you allow it. A notification while a trip records. Biometrics, if you lock the app.

Paid features are bought through the store you installed from. The apps never see your card.

Why small tools

Each one is built for something a person does regularly and would otherwise do in a spreadsheet or not at all. They are made to be opened on a phone in the middle of that job, so they are quick to reach, they show their workings rather than asking to be trusted, and they ask for nothing they do not need.

One App Company is a small studio in the UK. The apps are the whole business. There is nothing else to sell, so there is no reason to keep anything about you.

Get the apps

Free to start. Pro where it exists. Nothing to sign up for.

A button that goes nowhere is worse than an honest gap. An app not yet on a store says so, and its button is not a link until the listing is public.

1001 Pro Calculators and Tools

Live now on Google Play and the App Store. 250 calculators free forever, no ads on any tier, and Pro is £0.99 for the first year.

250 calculators free forever · Pro £0.99 a year, introductory · Trade Tools £9.99 once

CandleWatch

The full picture, screen by screen, is on candlewatch.co.uk. In closed testing — the Android and iPhone buttons above turn on the day each listing goes public.

Coming toGoogle PlayComing toApp Store

Free. No adverts, and no in-app purchases at launch.

Rihal: Quran and Hadith

A work in progress, not on the stores yet, and “Rihal” is a working title. The full app is free to use on the web, here.

Open the full app

Coming toGoogle PlayComing toApp Store

Free. No adverts, no paid features and no account, on any device.

Simply: Bills, Subs & Splits

In development. Not on either store yet — the Android and iPhone buttons above turn on the day each listing goes public.

Coming toGoogle PlayComing toApp Store

Free to download, tracking up to 10 bills and subscriptions at once. Pro is one price for you, or one for the whole household — cheaper per person the more of you are in it.

Sole Trader: Tax & Invoices

In development. Not on either store yet — the Android and iPhone buttons above turn on the day each listing goes public.

Coming toGoogle PlayComing toApp Store

Free — invoices, expenses, income and mileage, with no entry limits. Pro adds tracking more than one trade or business, automatic trip recording, PDF summaries and year-on-year comparison.

Anything about an app, its policy or a purchase: hello@oneappcompany.com.