A helpful little AI that lives inside your browser tab, wrapped in falling green code. It can chat, write files, and even click around on webpages for you — but it forgets everything when you close the tab, and it always asks first before doing anything real.
Unlocked powers
You pick the brain — Claude or GPT — and type your own key for that visit only. It's never saved anywhere, not even after you close the tab.
> you: explain photosynthesis like I'm 8
> coderain: sunlight is plant food! 🌱 here's how...
It can write files that only exist during your visit — like a notebook that vanishes when the visit ends. Make an HTML page and watch it come to life instantly.
> you: build me a countdown timer page
> coderain: done! here's a live preview →⏱️
Hand it a real file from your computer and it can read or edit it — but first it shows you the exact change, like a "sign here" moment, before saving anything.
> you: fix the typos in todo.txt
> coderain: here's the diff — approve? ✅
Instead of only guessing from memory, it can search the internet for things that happened after it was trained.
> you: who won the game last night?
> coderain: searching the web... 🔍
With a small helper extension, it can read your open tabs and even click or type for you — great for reading an inbox and drafting a reply.
> you: draft a reply to mom's email
> coderain: drafted! want me to press send? ⏸️
It can read your recent emails and prepare drafts for you — but it is physically unable to hit send. That button doesn't exist for it.
> you: anything important today?
> coderain: 2 unread — want a summary? 📬
What to build for school or work
Attach a real CSV export — sales, expenses, survey results — and get back a live chart dashboard you can screen-share in the next meeting.
> you: dashboard from q3_sales.csv, by region
> coderain: live preview ready 📈
Paste in messy lecture notes or a textbook chapter and get a flashcard or quiz page back, ready to click through before the exam.
> you: make flashcards from these bio notes
> coderain: 24 cards, live preview →🧠
Attach your actual essay or work memo. It proposes line edits for clarity and grammar, but you see the exact diff before a single word changes.
> you: tighten my thesis intro
> coderain: 9 edits proposed — approve? ✅
Describe a small tool, a class project, or a portfolio page and get a real, running HTML page — live preview instantly, downloadable when you're happy.
> you: build a simple portfolio landing page
> coderain: done — preview on the right 🚀
Attach the actual project files — a homework repo or a work script — and it reads, fixes, and shows a diff before touching your disk.
> you: fix the failing test in app.py
> coderain: found it — here's the fix
For a paper or a market brief, it can search the live web for current numbers and sources instead of relying only on training data.
> you: recent stats on EV adoption in the EU
> coderain: searching the web... 🔍
The house rules
It forgets everything
Close the tab and your key, chat, and files are gone. No account, no history.
It always asks first
Anything that looks risky — sending, deleting, paying, publishing — pauses for your okay.
It shows its work
Before touching a real file, you see the exact before-and-after, like checking homework.
It can't press send
Email drafts stay drafts. Sending is a button only you have.