On 6 October 2026 our founder Allen filmed himself for the first time. He was nervous, he did every line in short takes, and he made a promise on camera: one video a day for 100 days.
The series has one rule. Every day shows something real you can do with AI today, and almost every one gives away the exact prompt, skill or tool list so you can do it yourself, for free.
This page collects all of it. Each day has a full written guide on this site, with the free prompt inside it, the steps, what it costs, what can go wrong, and the sources we checked. New guides join this list the day they go live.
Short answer: 100 Days of AI is a daily series by The Growth Engine's founder. Each day tests one AI tool or method, mostly Claude Code, and each one has a free guide below.
- Every guide includes the full prompt or tool list, with a Copy button.
- No coding needed for any of them. Allen builds everything by talking to Claude in plain English.
- The tools are free or open source unless a guide says otherwise. Claude Code itself needs a paid Claude plan.
Why a marketer is doing this
Allen runs a marketing agency, and he does not write code. That is the point of the series. Most of what he shows here, he built by describing what he wanted to Claude and checking what came back.
That matters if you run a business. The useful question about AI is no longer whether a developer can build something with it. It is whether you can, this week, without hiring one. The series tests that question one tool at a time, and the guides below are the honest write-up: what worked, what did not, and what it cost.
Every guide so far
Newest first. The first link opens the full guide. The second opens the one-click copy page for its free prompt.
- Day 20: How to Add Sound Effects to Video With AI (Claude Code + Earshot)
Earshot lets Claude Code listen to your edit, find the cuts with no sound and render the whoosh to fill them. The full setup, every prompt, the costs, the limits and the fixes. Get the free prompt. - Day 12: How to Build in Minecraft With AI: Claude Code Places the Blocks
Type what you want in Minecraft and Claude Code builds it, block by block. The full Voxelwright AI setup, how to write good build requests, the costs, the limits and fixes. Get the free prompt. - Day 2: Claude Code for Business: Run Your Company From One Folder
Stop re-explaining your business to a chat window. Put your files in one folder, open it in Claude Code or Codex, and let two short files carry the context. Full setup and prompt. Get the free prompt.
How to use these guides
- Pick the one that matches a job you do every week: a website, a video, a writing task, a tool you pay for.
- Read the short answer box at the top. It tells you what you need and what it costs before you start.
- Copy the prompt with the Copy button and paste it into Claude Code, or the tool the guide names.
- Read the limits section before you rely on it for client work. Every guide has one.
What we check before a guide goes up
Every fact in these guides comes from our own tests or from a source we opened on the day we wrote it. Prices, version numbers, stars and release dates carry a date, because AI tools change every week. When a claim did not hold up, the guide says so and gives the corrected number.
We credit the people who build these tools by name, with a link to their work. Most of them are independent developers who publish for free.
Frequently asked questions
What is 100 Days of AI?
A daily series by Allen, founder of The Growth Engine. Each day tests one AI tool or method, mostly with Claude Code, and gives away the prompt or tool list so you can try it yourself.
Do I need to know how to code to follow these guides?
No. Allen does not write code. Every guide works by pasting a prompt into Claude Code or another tool and describing what you want in plain English.
Are the tools free?
Most are free or open source, and each guide says so. Claude Code needs a paid Claude plan, and a few guides mention paid upgrades where they exist.
Where can I watch the videos?
Each guide has its short video at the top. The series is also on Instagram, YouTube Shorts and X.