Viggo Meesters

I build tools for data, AI & everyday life.

Loose blocks

Drag to build. Click to pop out.Tap to pop out.

Drag to move, or use arrow keys. Click or press Enter to remove. Escape cancels dragging.

Things I've built.

SAP Data Readiness

Find the gaps in your SAP data.

Minimal ETL Modeler

Map, transform, export.

Visual PM

See the shape of a project.

CallerSignal

Explore the evidence behind a number.

Dayline

Give your day a shape.

Salary Calculator

Compare pay on equal terms.

Money Shower

Watch time turn into money.

Dimma

A preview of a calmer migraine tracker.

Kraamweek

Keep a log of the first week.

Hearthhold

Build a village. Bring a friend.

FrostFuse

A little chaos. A lot of snow.

Tools & ideas

Obsidian tools

Your files, at home in your notes.

friday.emlSample

Coffee on Friday?

From Alex Example <alex@example.com>
To Sam Example <sam@example.com>

Hi Sam,

Found a tiny coffee place around the corner.
Friday at 10?

Alex
Source file
From: Alex Example <alex@example.com>
To: Sam Example <sam@example.com>
Subject: Coffee on Friday?
Date: Fri, 12 Jun 2026 09:00:00 +0200
Content-Type: text/plain; charset=utf-8

Hi Sam,

Found a tiny coffee place around the corner.
Friday at 10?

Alex
Email ViewerGet the plugin ↗ Email Viewer

packing.csvSample

Packing list
itemquantitypacked
Camera1yes
Notebook1no
Coffee, for the road2no
Source file
item,quantity,packed
Camera,1,yes
Notebook,1,no
"Coffee, for the road",2,no
CSV / TSV ViewerGet the plugin ↗ CSV / TSV Viewer

weekend.jsonSample

trip"Ghent"
days2
packedfalse
stops[2]
0{2}
name"Coffee"
day1
1{2}
name"Canal walk"
day2
Source file
{
  "trip": "Ghent",
  "days": 2,
  "packed": false,
  "stops": [
    {
      "name": "Coffee",
      "day": 1
    },
    {
      "name": "Canal walk",
      "day": 2
    }
  ]
}
JSON ViewerGet the plugin ↗ JSON Viewer

coffee.icsSample

Coffee with Sam

08:00 to 08:30 UTC

Corner cafe

Source file
BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Viggo Website//Synthetic Sample//EN
BEGIN:VEVENT
UID:coffee@example.com
DTSTAMP:20260601T090000Z
DTSTART:20260612T080000Z
DTEND:20260612T083000Z
SUMMARY:Coffee with Sam
LOCATION:Corner cafe
END:VEVENT
END:VCALENDAR
Calendar ViewerGet the plugin ↗ Calendar Viewer

Helicopter to Detail

A big idea. Five levels closer.

1Goal

One home for 11 demos.

2Approach

See it. Open it.

Big screenshots. One short line.

3Steps

Collect. Build. Check.

Gather the demos, choose the images, build the page, test the links.

4Blueprint

Two columns.
One on your phone.

Static HTML. Direct links.

5Verification

11 links.
Nothing lost.

Desktop, phone and keyboard checked. Existing pages kept.

The method, applied to this homepage.

Go Workflow

An AI build workflow. One real website change.

Keep the demos.
Lose the detours.

The homepage still sent visitors to pages in the old style.

11 old links removed.

All appsWritingSystems

The demos still open directly.

A change.
With a check.

  • 11 demo links kept
  • 3 contact links kept
  • 158 other pages unchanged
A completed change to this website.

NL Zuiver

Minder jargon. Meer Nederlands.

Tik op het gekleurde woord.

Deze staat nog open.

Deze taak staat nog open.

Voorbeeld 1 van 3

Mini Life OS

Follow a thought. Find the connection.

Project

Project

Community
garden

A quiet corner, a few herbs, somewhere to sit. Making it happen with Sam Example.

NoteGarden sketch Next upReview the sketch

Person

Sam Example

Neighbour. Plant enthusiast. Drew the first plan for our community garden.

MadeGarden sketch TogetherReview the sketch

Note

Garden sketch

Herbs beside the path. A bench in the shade. A little space left to grow.

First idea by Sam Example for the community garden.

Next upReview the sketch

Task

Review
the sketch

Walk through the garden sketch with Sam Example. Pick a spot for the bench.

ProjectCommunity garden
Fictional notes

Knowledge Pyramid

Start with the same measure.

400 g

Pocket
Oats

€2.40per pack

€0.60 per 100 g

750 g

Pantry
Oats

€3.60per pack

€0.48 per 100 g

Pocket Oats has the lower pack price. Pantry Oats costs less per 100 g.

Show the maths

Price ÷ grams × 100

Pocket Oats
€2.40 ÷ 400 × 100 = €0.60
Pantry Oats
€3.60 ÷ 750 × 100 = €0.48
Fictional products & prices

Source-backed Synthesis

Does working from home work?

Different setups.
Different results.

Hybrid: fewer quits
“We found that hybrid working improved job satisfaction and reduced quit rates by one-third.”

Trip.com · 1,612 staff · Up to 2 home days/week.

Measured performance did not decline.

Bloom, Han & Liang · Nature, 2024
Remote: slower data entry
“the productivity of workers randomly assigned to WFH is 18% lower than those in the office.”

India · 235 recruits · Fully remote or office.

Productivity here: correct entries per minute.

Atkin, Schoar & Shinde · NBER, 2023 Working paper · revised December 2023
Why uncertain?

Different jobs, schedules and measures.

Neither trial directly compares hybrid with fully remote work. These results do not tell us what works best for every team.

Next: evidence from a comparable team and task.

Open a claim. Follow its source.

AI skills

Pick a skill. Take a prompt.

Brainstorm example

A tool shelf for the street

Neighbours buy tools they use once. Could they share?

First move

Try a paper sign-up sheet with five neighbours before building an app.

Show prompt
Audit example

A sign-up plan with gaps

Email → Join → Thank you. What is missing?

First move

Specify failed submissions before promising a successful sign-up.

Show prompt
Debug example

One click. Two counts.

The counter starts at 0. One click on Add shows 2.

First move

Reproduce one click → 2. Isolate the extra increment before changing the code.

Show prompt
Example prompts