Si’s Developers

Project previews & working concepts

Selected apps and projects we’ve been developing, locally in Guernsey. Live apps are listed with a link; everything else is shown as a concept or project preview.

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Concept index

  • Invoxa

    Business administration & invoicing

    01 · In testing

  • Fo-cal

    AI calorie tracking

    02 · On the App Store

  • Proof Guard

    Proof of condition

    03 · On the App Store

  • Multi Trades Estimator

    Estimating & quoting for trades

    04 · On the App Store

  • SiteDocs AI

    AI-assisted business documentation

    05 · Live website
Invoices2 paid
INV-1042 · Harbour JoineryPaid
INV-1041 · Vale ElectricalPaid
INV-1040 · St Peter Port CaféDue
In testingExample concept
Business administration & invoicing

Invoxa

Keeping customers, jobs, quotes and payments in one tidy place, so the admin side of a small business doesn’t spill across notebooks, email and three separate apps.

The problem it addresses

Invoices, customer records and follow-ups scattered across spreadsheets and inboxes, with no clear picture of what’s been paid.

How it’s taking shape

  • A single record for each customer and job
  • Invoices generated from the work you’ve already recorded
  • A simple overview of what’s outstanding and what’s paid
AdminInvoicingDashboard
TodayScan a meal
Logged
1,240 / 1,800 kcal
Porridge & berries320
Chicken salad480
Meal — photo440?
Estimated by AI — review before saving
On the App Store
AI calorie tracking

Fo-cal

A calorie tracker that uses AI to take the guesswork out of logging food — describe a meal or photograph it, and Fo-cal turns it into an estimate to check and edit, rather than typing every ingredient by hand.

The problem it addresses

Food tracking falls apart when every meal needs weighing and searching through long ingredient lists, so the habit rarely lasts.

How it’s taking shape

  • Describe or photograph a meal instead of entering every item
  • AI produces an estimated calorie breakdown for you to review
  • Edits are easy when you know the portion better than the estimate
  • A running daily view so progress is visible at a glance
AICaloriesHealth
Visit Fo-cal on the App Store
Condition recordSigned off
Before
After
14 Oct 2026 · 09:42 Intact
Van hire · HK-1042 · 6 photos
On the App Store
Proof of condition

Proof Guard

A record of the condition of goods and property at handover — photographed before and after, so everyone can see exactly what was received and in what state, rather than relying on a description.

The problem it addresses

Condition disputes after delivery, hire or a tenancy depend on memory and poorly labelled photos, with nothing clear to refer back to.

How it’s taking shape

  • Condition photographs recorded at the point of handover
  • Each record tied to the item, date and time
  • Before-and-after views side by side
  • A clear record both parties can refer back to
ProofConditionRecords
Visit Proof Guard on the App Store
Estimate builder
Labour£420
Materials£185
Access equipment£60
Draft total£665
On the App Store
Estimating & quoting for trades

Multi Trades Estimator

Estimating and quoting built for trade businesses — create a clear, professional quote on site rather than writing it up late in the evening.

The problem it addresses

Quotes built by hand at the end of the day, using remembered prices and a lot of copying and pasting.

How it’s taking shape

  • Reusable pricing items and templates
  • Mobile-first quote building, usable on site
  • A clear summary the customer can understand at a glance
QuotingTradesMobile
Visit Multi Trades Estimator on the App Store
Draft report
AI draft — review before sending
Live website
AI-assisted business documentation

SiteDocs AI

Turning voice notes, photos and rough notes into organised job reports and documentation — with a person reviewing and editing before anything is sent.

The problem it addresses

Job reports written from memory after the fact, with photos lost in phone galleries and details missed.

How it’s taking shape

  • Capture notes and photos on site
  • AI drafts the document in a consistent structure
  • Review and edit before sharing with the customer
AIDocumentsReports
Visit SiteDocs AI

Have a project that could sit here?

We’re happy to show more detail on any of these concepts in a conversation — and to hear what you’re working on. If we build something with you, the details only appear on this page once you’re happy with them.

Start a conversation
How it works

How a project becomes something we can show

No jargon, no surprise invoices. You’ll know what’s happening and what it costs at every stage.

  1. 01

    Tell us what you need

    A conversation about your business, what’s working and what’s getting in the way.

  2. 02

    Agree the scope and quote

    We set out exactly what will be built, what it costs and what’s included — in writing.

  3. 03

    Design, build and review

    You see progress as it happens and give feedback before anything goes live.

  4. 04

    Launch and ongoing support

    We help you go live and can stay involved afterwards if you’d like.

Agreed up front. Scope, deliverables and costs are agreed before work begins. Timelines are planned together rather than promised in advance.

Also worth a look

Websites that work for your businessApps built around how you workAI that takes work off your plate
Start a conversation

Got an idea—or a task you’re tired of doing manually?

Tell us what you want to build or improve. We’ll help you work out a practical next step.

An honest reply, usually within one working day.

  • A short, no-obligation conversation
  • A clear view of what’s possible
  • Scope and costs agreed before any work begins

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