tools that think
systems that scale
decisions that compound
PRIMEFOLD
TOOLS
Everything here exists for one reason:
Find what survives contact with reality.
PrimeFold is where
knowledge becomes tools
Trading systems, AI tools, and field notes
TRADING
PrimeFold Trading
is a systematic trading research lab
built to find what survives real markets.
More than 5 million backtests
across 3,000+ assets and 7 timeframes
have narrowed to 80-plus validated edges.
It runs the usual process backwards
starting with the evidence,
then keeping only the strategies that survive it.
The output:
Regime-aware TradingView indicators,
Systematic trading research,
and a repeatable way
to separate durable edges
from attractive stories.
Most backtests are fantasy.
These are the strategies that survived contact with real markets.
TOOLS
PrimeFold Tools
are AI tools forged inside working systems
before they're offered to anyone else.
Each began as a real workflow,
a recurring problem,
or a decision process
inside an operating business.
The collection of
Custom GPTs, prompt systems,
and decision tools,
is built to save time,
increase signal,
and sharpen decisions.
Tools forged in real life.
built from workflows
I use myself.
WRITING
The PrimeFold Press
is a weekly trading newsletter
field report from the validation engine.it publishes what was tested,
what failed, what survived,
and what changed as a result.Built for systematic traders
and prop-firm operators,
it trades prediction
for evidence gathered in real market contact.
Every Sunday:
What survived validation this week.Field reports
from the validation enginethe tests, failures, survivors,and lessons worth carrying forward.
Hidden Heuristics
is a field notes publication
about the compressed rules running
cognition, culture, capital,
and everyday decisions.A heuristic is a theory of the world compressed into action,
most run invisibly until reality exposes whether they still hold.Each essay names one hidden rule
a belief, a habit, a ritual, an institution
and tests whether it still matches the world we live in.
Every Wednesday:
The most dangerous hidden rule
is the belief that you have none.
LABS
PrimeFold Labs
is the workshop
where ideas earn the right to exist.
Experimental AI tools,
Custom GPTs, research projects,
and workflows are built, tested,
and used in the open
before they become products.Some graduate.
Most don't.
The point isn't to generate ideas,
it's to find the few that survive real use.
Prototype tools,
Custom builds, Skills, Research
and ideas still earning their place.
(maybe even a little weird)
LIFE
I test ideas against reality
and share what survives.
Trader, builder, husband, father,and systems designer
exploring judgment under consequence.
Collin Nerdahl
works at the intersection
of systematic trading,
AI systems, business operations, and family life.PrimeFold is the public record
of testing ideas across all four
and keeping what survives.One standard throughout:
ideas are interesting, evidence is decisive.
Systematic trader - Builder - Operator
3 years AI systems design
9+ years trading
15 years lean manufacturing
Top 1% of 60,000 traders
18 years real estate
PRIMEFOLD TRADING
PrimeFold Trading
is a systematic trading research lab
built on one rule:
REALITY GETS THE FINAL VOTE
The research lab that runs the process backwards.
Most trading research starts with a strategy and hunts for evidence to justify it, this starts with the evidence
and keeps only what survives.
More than 5 million backtests across
3,000+ assets and 7 timeframes
have narrowed the field to 80-plus validated edges
across 13 edge families,
What comes out:
Regime-aware TradingView indicators,
Systematic and quantitative trading research,
and a repeatable way to tell durable edges
from attractive stories.
PRIMEFOLD TOOLS
PrimeFold Tools are
AI tools forged in real decisions.
Each one started as a real workflow,
a recurring problem,
or a decision process
inside an operating business,
not a feature looking for a use.
Skills and Custom GPTs,
prompt systems, and decision tools,
built to save time, increase signal,
and sharpen decisions.
If a tool made it to this page,
it passed the only test that matters:
it's still being used.
PRIMEFOLD LABS
PrimeFold Labs
is the workshop, where ideas earn the right to exist.
Prototype experimental AI tools,
Skills, Custom GPTs, and
Research projects
built and tested in the open
before they become products or services.
Some graduate.
Most don't.That's the point:
Labs is where weird ideas earn their place
by surviving real use,
not by sounding good in a pitch.
Experimental AI tools, SkillsCustom GPTs, Research projects, prompt stacks, and workflows,
built and tested in the open before any become products.
Some graduate.
Most don't, and that's the point.
Labs isn't for making more ideas (those are cheap); it's the filter for finding the few that survive real use.Rough edges, works-in-progress, build-in-public experiments at the frontier of human-AI collaboration.
THE PRIMEFOLD PRESS
The PrimeFold Press
is a weekly trading newsletter
for systematic traders
and prop-firm operators.
it publishes:
field notes from the validation engine
the strategies that failed, the ones that survived,
and the lessons worth carrying forward.
No hype, no signals for sale:just what survived contact
with the market that week.
Every Sunday:
A running record of systematic trading research in motion,
for systematic traders, quants, and prop-firm operators.
It trades prediction for evidence gathered in real market contact.
Fewer hot takes, more receipts.Free, weekly.
HIDDEN HEURISTICS
Hidden Heuristics
is a field-notes publication about:
the compressed rules running
cognition, culture, capital,
and everyday decisions.
A heuristic is not a shortcut.
It is a theory of the world compressed into an action,
and most run invisibly
until reality exposes whether they still hold,
and tests whether it still matches the world.
Each essay names one:a belief, a habit, a ritual, an institution, a mental model,and tests whether it still matches the world.
For people who run something real (capital, code, organizations, craft) and think structurally about the rules underneath. Part decision-making, part sense-making, part field guide to the heuristics shaping how we think, spend, build, and choose.
THE TOOL BOX SAMPLES
AI sounds confident even when it's wrong.
🔎
FACT GUARD
🛡️
helps you spot hallucinations,
fake certainty, and risky claims
before they cost you
time, money, or credibility
so you can verify first
and act with confidence.
Most people drown in complexity,
collecting more information
when what they really need is the underlying structure.
🧬
PRIMITIVE EXTRACTOR
🧬
strips any concept, problem, or
system down to its irreducible building blocks,
revealing the few forces that actually drive everything else.
Stop memorizing frameworks
start seeing the patterns beneath them.
Most people launch first
and discover the flaws later
after they've already spent
time, money, and credibility.
♼
THE SIMULATION ENGINE
♼
pressure-test ideas before you commit
by simulating likely outcomes,
exposing hidden risks,
forecasting competitor reactions,
and identifying what is most likely to work.
If you're tired of guessing between options
and hoping for the best,
try the probable consequences
before you make the decision.
Your writing probably doesn't need more polish.
It needs less AI.If you've ever read something you wrote with ChatGPT
and thought, why does this sound so weirdly professional?
that's where I come in.
Paste the text.
👤
NOT A BOT
👤
will remove the filler,
flatten the corporate tone,
fix the robotic rhythm,
and keep the parts
that actually sound like you.No rewriting your personality.No making everything sound like a LinkedIn post.No turning three sentences into ten.
Just cleaner, more human writing
that still
feels like yours.
EXPERIMENTS
Love each other,
but struggling to stay connected?
In just 5 minutes,
💞
Closer Connection
💗
helps you share what's really going onyour feelings, needs, appreciation,
and winsbefore distance, resentment, or miscommunication creep in.Strong relationships aren't built on having more time,they're built on staying connected with the time you have.
💖
Most people don't need more things to dothey need experiences worth remembering.
✨
Dream Day
✨
turns free time into story-worthy adventures
by eliminating decision fatigue
and designing personalized days
filled with hidden gems,
meaningful moments, and realistic planning.
✨
Instead of another generic itinerary,
you get a day you'll still be talking about years from now.
Feeling stuck,
overwhelmed, or torn between competing voices in your head?
Wise Counsel
helps you access the wisdom you already have
by bringing your inner council
🦉
Elder, Warrior, Queen, Trickster,
and more into conversation,
turning confusion into clarity
and self-trust.
🦉
Instead of giving you answers,
it helps you hear your own.
Stop wasting time searching
for activities that won't actually work.
⚡️
Play Spark
⚡️
gives you age-appropriate, low-prep plans
tailored to your kids, your energy,
and the reality of today,
⚡️
so you can spend less time deciding and more time
enjoying your family.
I take on a few custom builds a year,
picked by the problem and project.
If you're building something hard,
tell me what it is.
© PrimeFold.Tools. All rights reserved.