A free interactive technology lab

Complicated technology, made understandable.

Watch AI, data, networks, automation, and live systems actually work — and use free tools that run right in your browser. Free to use today; no account required.

Launch the Situation Room

or explore the lab benches first

The way in, every time: see it → understand it → try it → use it.

live data AI lab data flow automation

that’s Pip. He runs the place.

What’s happening around you, right now?

A live-data console for the world outside your window. The Situation Room pulls real public data systems — the National Weather Service, USGS, NASA, and NOAA — and turns what they report into plain statements: official alerts, earthquakes, space weather, rain radar. No forecasts dressed up as facts — and no account needed to use it.

Live weather
Official alerts
Earthquakes
Rain radar
Space weather

What you’ll learnHow to read official weather alerts, earthquake feeds, and space weather like a forecaster — and which sources to trust.

MapLibre
OpenFreeMap
Flow Engine
Live public APIs

Launch the Situation Room Or poke the lab first

Pick any location or use your own — geolocation is opt-in, and your location is never tracked or saved unless you ask for it. Sources are always labeled on every reading.

The interactive lab

Watch technology actually work.

AI, data, networks, automation, and live systems — most interactive things below run in your browser tab, because local-first is the house rule: PDF conversions, game state, and your favorites live on your device. Live data and contact messages are the deliberate exceptions — they use small server endpoints, and each one says so up front. No uploads, no accounts needed today, nothing to configure. If a data source fails, that part says so honestly and the rest keeps working.

What you’ll learnWhat an LLM actually does token by token, how RAG grounds answers in documents, and how an agent loops through tools.

Open AI Lab

What you’ll learnHow packets move through a network, and how to trace a fault to its exact source.

Open Network Lab

What you’ll learnHow raw data gets cleaned, reshaped, and charted — and how one broken rule corrupts everything downstream.

Open Data Pipeline Lab

What you’ll learnHow to wire live data through logic blocks into actions, and watch execution travel node by node.

Open Automation Lab

What you’ll learnHow a fault in one component cascades through a rack — and how to isolate the culprit.

Open Server Room

Mini games

Play something. Learn what’s happening underneath.

PlainLogic teaches more than AI. Free the car in Parking Panic, balance payload and fuel to hit its target altitude in Rocket Launch — or sharpen real AI skills with Prompt Repair. Every game hides a lesson; all free, all in your browser.

New · Logic puzzle Parking Panic A packed lot, one exit, and your car boxed in. Slide the other cars aside — free the car in as few moves as possible.

New · Science sim Rocket Launch Balance payload, fuel, and thrust to hit its target altitude. A simplified model of real tradeoffs — 3 to 6 minutes.

AI skills Prompt Repair Repair broken AI prompts by picking the right pieces — goal, context, constraints, output. ~8 minutes of actual skill.

Explore Mini Games

Learn

Start learning

Short, plain guides that teach the ideas behind the lab. No jargon, no prerequisites — just the concepts, explained like a friend would.

AI, plainly

What a language model actually does when it writes one word at a time — and what RAG and agents add on top.

Read the AI guides

Ship apps for free

Static sites, generous free tiers, and the GitHub-to-live pipeline that ships PlainLogic itself — for $0.

Read the shipping guides

Code with the labs

Open a lab bench, break something on purpose, and learn by fixing it. The labs are the curriculum.

Read the lab guides

Start learning

The PDF tools

Convert this PDF to… that.

Four small tools that do one job each, right in your browser. Your files are processed on your device — that is the whole design. They live on their own page now, same tools, same privacy.

What you’ll learnHow a document gets generated on your device — no server, no upload.

Open Text → PDF

What you’ll learnHow photos get merged into one document, in page order, without leaving your device.

Open Photos → PDF

What you’ll learnHow PDFs store text — and why some PDFs have none at all.

Open PDF → Text

What you’ll learnQuick text tricks: counts, reading time, and cleanup for pasted text.

Open the text toolkit

Notes from the lab

Notes from the lab.

Notes from building this lab: AI, agents, automation, and the tools that make software useful. Written when there is something worth saying, not on a schedule.

Actual Project Plain Logic Experiments

Pip started as a local rule-based assistant. Here’s what it became.

Oct 2, 20264 min read

The assistant in the corner of this page answers questions, opens tools, and finds posts. It does all of that with keyword matching and a hand written knowledge base. This is how it works, and where it honestly falls down.

Meet Pip

Guide Building with AI

Build your first tiny tool with Mini Lab

Oct 2, 20264 min read

Mini Lab wires an input, some logic, and an action into a working tool. This walkthrough builds a word counter in about a minute, then shows the variations that make the idea useful.

Open the Automation Lab

Research AI Guides / Explainers

AI agents, assistants, and automation: what is the difference?

Oct 2, 20264 min read

Three words that get used like they mean the same thing. They do not, and the difference decides what kind of help you actually get from a piece of software.

Read the AI guide

Guide Tools / Tutorials

How to turn a stack of photos into one PDF

Oct 2, 20263 min read

Receipts, signed forms, whiteboard shots from a meeting: phones fill up with photos that really want to be a single document. Here is the quick way to merge them, no app install and no uploading your pictures to a stranger’s server.

Open the PDF tools

Illustrative Example Automation

Small automations that give you an hour back every week

Oct 1, 20264 min read

Automation does not have to mean a robot army or a complicated setup. The useful version is a handful of tiny rules quietly handling the chores you keep doing by hand.

Open the Automation Lab

Browse the Learn hub

About

Hi, I’m the person behind PlainLogic.

I build small, useful software — free tools and visual technology education, published here for everyone to use. PlainLogic is an interactive technology lab: you can watch AI, data, networks, automation, and live systems actually work, and try the tools yourself along the way. Every bench follows the same way in: see it, understand it, try it, use it.

Most of my time lately goes into the assistant and agent space: figuring out how AI can take on real, useful jobs and make them feel effortless. The converters and games here are the public side of that work. Simple on the surface, deliberate underneath, and always improving.

Most of the processing happens right in your browser — the tools, games, and experiments run locally, with no downloads and no account needed today. Four small server endpoints handle the rest: live data flows through /api/live (Situation Room, Pip’s live answers, Automation live triggers), Pip’s contact mode sends messages through /api/contact, the mailing list uses /api/subscribe, and inbound email arrives through /api/inbound-email. If a tool saves you a few minutes or a game earns a smile, it did its job.

1 Most things run in your browser. Nothing to install, no account needed today.
2 New projects ship when they’re ready, then get better in public.
3 Every tool and game is free to use today, as often as you like.

Pip, head of the lab

Pip signs off on every tool and game before it ships. The standard is simple: it works, it’s friendly, and it earns its place on the page.

Questions

Asked often, answered plainly.

The things people want to know before trusting a free tool with their files.

Are the PlainLogic tools really free?

Yes. Every tool and game on this page is free to use as often as you like — no account, no trial. PlainLogic may introduce optional accounts or paid features in the future, but the core tools are free to use today.

Do my files get uploaded to a server?

No. These converters run in your browser tab, on your own device — local-first is the house rule. Your PDFs, photos, and text are processed where they sit; the one exception is the PDF-to-Text reader library, which loads from a public CDN the first time you use it. Your files themselves never go anywhere.

Why did PDF to Text come back empty?

Some PDFs are really just pictures of pages, usually scans or photos of documents. Those have no text layer to pull from. You would need an OCR tool, which reads the pixels themselves, to get words out of a scanned PDF.

Do the tools work on my phone?

Yes. Everything here runs in a mobile browser, and the layout adapts to small screens. If a tool misbehaves on your device, send an email and tell me what happened.

Can I ask for a new tool or game?

Please do. Tool requests from visitors are how this page grows. Send an email describing the annoying little task you wish a website would just handle, and it goes on the list.

Get in touch

Say hello. Pip reads everything.

Tool ideas, game suggestions, bug reports, or a note about something on this page that helped you. Email is the front door here, and it actually gets read.

Write to the lab

The fastest way to reach the person behind PlainLogic. Project requests and tool ideas are especially welcome.

help@plainlogic.org

Send an email Request a tool

Both buttons open your own mail app with the address filled in. Nothing is sent from this page itself. This is the human inbox — for updates by email instead, the Get PlainLogic list is the card next door.

Get PlainLogic

Useful AI and technology, explained simply. New tools, practical guides, prompt techniques, and the occasional update worth knowing about.

New useful tools when they ship
Plain-English AI guides
Prompt techniques that work
Important AI updates
New interactive labs

This is the automated list — one-way updates in your inbox. For a human reply, write to help@plainlogic.org instead.

Build with me

Need something like this built for your workflow?

Tell me what you’re trying to automate. Fixed-scope requests only: send the details by email and you’ll get a straight answer about whether it fits and what it would take. No sales call required.

Describe the build

Featured build · Situation Room v0.1 Situation Room A live-data console for the world outside your window — real public data, stated plainly.

Watch technology actually work.

New · interactive lab AI Lab Press Run and watch how a language model writes one token at a time, how RAG grounds answers in documents, and how an agent loops through tools to reach its goal — all honestly labeled as simplified.

New · interactive lab Network Operations Lab Watch a packet travel from a PC through switches, a firewall, and a router to the Internet — then break things on purpose and learn to find the fault.

New · interactive lab Data Pipeline Lab Watch a messy dataset get cleaned, reshaped, and charted step by step — then find the broken cleaning rule, fix it, and rerun the pipeline.

New · interactive lab Automation Lab The full workflow builder: wire live data through logic blocks to actions, press Run, and watch execution travel node by node. Mini Lab’s big sibling.

New · interactive lab Server Room A simulated rack — UPS, switch, servers, database. Inject a fault, watch it cascade, find the culprit, and bring everything back healthy.

Play something. Learn what’s happening underneath.

New · Logic puzzle Parking Panic A packed lot, one exit, and your car boxed in. Slide the other cars aside — free the car in as few moves as possible.

New · Science sim Rocket Launch Balance payload, fuel, and thrust to hit its target altitude. A simplified model of real tradeoffs — 3 to 6 minutes.

AI skills Prompt Repair Repair broken AI prompts by picking the right pieces — goal, context, constraints, output. ~8 minutes of actual skill.

Start learning

AI, plainly

Ship apps for free

Code with the labs

Convert this PDF to… that.

Free · in your browser Text → PDF Paste some words, download a tidy PDF. Great for notes, drafts, and anything that should be a document now.

Free · in your browser Photos → PDF Turn a stack of photos into one PDF. Receipts, signed forms, whiteboard shots — merged in page order.

Free · in your browser PDF → Text Pull the text layer out of a PDF, page by page. If the PDF is really just pictures of pages, it will tell you so.

Free · in your browser Text toolkit Word counts, reading time, case changes, and cleanup tricks for whatever you just pasted in.

Notes from the lab.

Pip started as a local rule-based assistant. Here’s what it became.

Build your first tiny tool with Mini Lab

AI agents, assistants, and automation: what is the difference?

How to turn a stack of photos into one PDF

Small automations that give you an hour back every week

Hi, I’m the person behind PlainLogic.

Asked often, answered plainly.

Say hello. Pip reads everything.

Write to the lab

Get PlainLogic

Need something like this built for your workflow?