Megan Warren ·
Educator and Creative

software you can just open.

25+ shipped this year.
Ten are open to the public. Open one right now and see for yourself.

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Discrete Math and Linear Algebra

Course textbook · 6 units · 44 sections · high school and up · one HTML file · free on Apple Books

Every choice in this book is backed by something, not a guess. Before writing a single section, I pulled research on what actually keeps teenagers engaged with material like this. I scraped it, then distilled it into patterns, the dos and don'ts that guide how the book reads, not just what it teaches. When I do not know something for certain, I look it up. I would rather spend an hour confirming a fact than ship a guess.

The same engine behind this book, one source that forks into a student edition and a facilitator's answer-key edition, works just as well for a corporate onboarding guide or a certification study guide. That is a book commission I take on just as readily as a classroom textbook.

It opens at its own landing page first, what's inside and who it's for, before the full book loads. The other four books below open the same way.

The same source file also builds a free Apple Books edition, where the widgets become pictures that link back to the live ones.

Open the textbook

Calculus Derivatives

Course textbook · 5 units · 43 sections · high school and up · one HTML file · free on Apple Books

Same engine as Discrete Math and Linear Algebra, a different course: limits build into the definition of a derivative, then the rules that make it fast (the product, chain, and quotient rules), then what a derivative is actually for (implicit differentiation, related rates, optimization). 43 sections, 12 of them holding an interactive widget you drag and watch respond, not just read about.

Its landing page shows what's inside and who it's for before the full book loads. The same source file also builds a free Apple Books edition, where the widgets become pictures that link back to the live ones.

Open the textbook

Calculus Integrals

Course textbook · 5 units · 42 sections · high school and up · one HTML file · free on Apple Books

The back half of the same calculus sequence: area under a curve builds into the Fundamental Theorem, then substitution and the rest of integration technique, then what it's for. 5 units, 42 sections, the same hint-laddered exercises and read-aloud math as its sibling books, written for this course, not copied from it.

Open the textbook

Trigonometry

Course textbook · 6 units · 47 sections · high school and up · one HTML file · free on Apple Books

The biggest of the four, 47 sections across 6 units: triangle geometry and the Law of Sines and Cosines first, then the unit circle, radians, and the identities calculus leans on later. 12 sections carry an interactive widget, and it's the largest file of the four, a fair sign of how much book fits in one page.

Open the textbook

The History of Calculus

Companion web book · high school and up · free to read, nothing to download · free on Apple Books

Not a course textbook, a companion to the two calculus ones: 23 centuries of who actually found calculus, who fought over who found it first, and why the notation ended up the way it is. 340 dated events, 212 people, 253 sources in full citation, and a Disputed label wherever historians genuinely disagree instead of the book quietly picking a side.

Every section of both calculus books links to the chapter behind it. The first chapter is a 3-minute read; the whole story runs about 2 hours 31 minutes. Unlike its four siblings, it opens straight into the book, no landing page first.

It is on Apple Books too, free, so it reads on an iPhone, iPad or Mac with highlighting and notes: The History of Calculus.

This is one of seven. All of them, four course textbooks and three history companions grouped by course, are listed together at the books hub.

Read the History of Calculus

Grouper

Classroom tool · in daily use · one HTML file

Built to run 3 Minds, 1 Marker, the daily random-grouping routine from Building Thinking Classrooms. Save your classes and rosters once and they're just there every day, no re-typing a list. Every group gets real roles (Scribe, Speaker, Inquirer), and a built-in timer keeps rounds moving. A separate presentation screen shows the room a clean projected view instead of the teacher's own working screen. Groups are genuinely random, and the tool remembers your last several rounds, so it avoids repeating a pairing from recent memory. No student is ever left alone: when the numbers don't divide evenly, the tool builds one group of three instead of leaving someone out.

Open Grouper

Wildcard

Icebreaker · 190 questions · one HTML file

I built it to open class every so often. Real celebrity-interview questions land better with students than the usual icebreaker-deck fluff. So I scraped good ones from podcast transcripts, then rewrote the best so whoever spins can actually answer, not just the specific celebrity who was originally asked. Filter by podcast or by vibe, and pick more than one of each.

Open Wildcard

Color Companion

Color matcher · full marker set · one HTML file

Built for myself first. I hated being lied to by the plastic caps on even high-end art supplies, since the cap color and the real ink are rarely the same. So I swatched every marker I own and built a matcher instead. Upload a photo of anything you want to recreate, or snap a printed swatch sheet, and it tells you exactly which of your own markers to reach for. No more guessing.

Open Color Companion

Ask the Turtle

Marketing site + free tools · for a Boston consultancy

The live marketing website for a nonprofit-fundraising consultancy founded by my husband, built end to end. Navy is the anchor (used instead of black). Lime is the single accent, one pop per view. The listening rings, three concentric ripples in lime, sky, and teal, literalize the brand's promise to listen first. I took the founder's vision and built the site that carries it.

My favorite page on the site was an idea I had partway through the build, an add-on I was fully prepared to cut when we reviewed the final draft together. It stayed: a free Tools page with working fundraising calculators (a gift range chart, an ask-amount suggester, a retention and ROI tool) that visitors can use before ever hiring the firm. The kind of thing big firms keep behind a login, given away as the handshake.

Visit the site My favorite page: the Tools

Hello Paint

Brand system for an Etsy shop

A warm, hand-painted identity for an Etsy shop selling custom paint-by-number kits: a photo goes in, a paintable kit comes out. Raspberry carries the “hello.” Plum ink stands in for black in the body copy. The palette skips orange on purpose, so it reads as human-made, never techy. I designed the whole system, mark, color, type, voice, and templates, then built it as a fully offline brand book.

Open the brand kit

A few of the decisions nobody asks about.

Real details, from real, shipped tools

No wifi.
No login.
No install.

Why that's not a small thing

A tool that needs a connection breaks exactly when you need it most: mid-class, on a school network having a bad day, on a plane. Everything I build works the same whether you're at a desk or standing in front of thirty kids with the wifi down.

Built to survive the exact moment it needs to work.

GROUP 3 100% new

L Leila Scribe

G Grace Speaker

T Theo Inquirer

What “100% new” tracks

The tool remembers the last several rounds of groups, so a fresh trio is never a coincidence. It's the freshest match it could find.

Scribe writes, Speaker talks, Inquirer asks. One marker, three real jobs.

P(A|B) = P(A∩B)P(B)

The book's read-aloud says, word for word

“P of A given B equals the fraction P of A intersect B over P of B”

Every fraction stacks on screen, and the read-aloud speaks the same math, not around it.

Not everything I build can be public.

Selected private work

Prospect Waterfall

Nonprofit research tool · built for one client · not public

A waterfall-enrichment engine for nonprofit development work. Give it an organization's name, and it pulls real IRS Form 990 financial data, computes an actual multi-year funding trend instead of a single snapshot, and finds and verifies real contacts there. Each contact is checked by a real evaluator before it counts as a hit, and every provider it tries is logged, so nothing is a guess dressed up as a result. Built for a fundraising consultancy's internal use, and it stays that way: the exact discovery logic is part of what makes it valuable to the people who paid for it.

Daily Lesson Kit

Teaching companion · Trig, Derivatives, Integrals

The most ambitious thing I've built for my own classroom: a daily companion that runs the actual routines research says work. It bundles a silent-scribe warm-up, an honest check-in, and Grouper, all built right in. Live lunch and advisory feed data keeps it actually current, not a static template. Every research-grounded habit in my teaching lives in one place here. It stays private because it's tuned to my own courses and curriculum, but a version built around your own daily routines is exactly the kind of thing I take on commission.

How I work

Offline first

Every tool here runs with zero network calls after it loads, by choice. Need something connected instead? That works too.

Fixed price

You know the number before I start. No surprise invoices. Most commissions land between $1,500 and $10,000, priced by scope, never by the hour.

One point of contact

You talk to the person who actually builds it, always.

Ships fast

Tools like the ones shown here ship in one to three weeks, start to finish.

Commissions, plainly

What I take on

Custom software commissions: small, focused web tools (a Grouper, a Wildcard, a desk built around your work), brand systems delivered as working offline documents, marketing sites, and design audits. Book commissions: interactive textbooks, study guides, onboarding guides, and training manuals, print-ready when you need paper too.

What I don't

Enterprise software and open-ended “figure it out as we go” projects. If your project is that shape, I will tell you fast, so you are not waiting on me to find that out.

Timing and where

I take a small number of commissions at a time, since the school year starts again in September. I work from Boston, Massachusetts, and remotely everywhere else. Location does not change the price.

The first step

One email describing the thing you wish existed. You get an honest read on fit, then a real number and a real date before I start.

Megan Warren ·
Educator and Creative

Have something you wish already existed?

Tell me what it is.
I will tell you honestly whether it is a good fit.
If it is, you will get a real number and a real timeline before we start.

Prefer to learn to do it yourself?

1:1 AI coaching

Watching someone else use a tool does not teach most people something they can repeat tomorrow. I build a plan around how you already work, then sit next to you while you drive. You leave able to do it again without me.

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