About

10 tools. One developer.
Built to actually work.

Extensions Market is a one-person indie studio out of San Francisco. Every product started as a problem I ran into personally — a spreadsheet that should have been a button, a calculation that should have been instant, a workflow that no existing tool handled well. So I built it.

10
Live products
5
Chrome extensions
5
Shopify apps
Vladislav Gerasimchuk
Founder, Extensions Market
San Francisco, CA  ·  [email protected]

The story

I started with a simple rule: only build something if I would use it myself.

AirPrice came first. I had an Airbnb listing and was pricing it by gut feel — occasionally checking nearby listings, making rough mental comparisons. A bad way to price anything. I wanted a tool that pulled comparable listings, computed an optimal rate, and surfaced it right inside Airbnb. No one had built it. So I did.

Then STRInvest. I was analyzing whether a property was worth buying as a short-term rental. Every time, it was 45 minutes in a spreadsheet — cap rate, projected occupancy, cash-on-cash return, STR regulations. I built an extension that does it in under 60 seconds, right on the Zillow or Redfin listing page.

HomePilot came from buying my own house and realizing that Zillow's estimates tell you nothing about what you'd actually pay each month — no HOA, no PMI, no maintenance, no closing costs. CarWise came from buying a used car and wishing VIN lookup, safety ratings, and real market value were all in one place instead of five separate websites. JobPilot came from watching friends rewrite the same cover letter a hundred times for jobs that deserved a tailored response.

The Shopify side followed the same logic. EZStock exists because Shopify retired their own inventory tool, Stocky, leaving thousands of merchants without a replacement. EZDrop exists because product drops deserved a viral waitlist mechanic that builds word-of-mouth before launch day. PopBoost exists because conversion widgets shouldn't require five separate app subscriptions. EZBundle exists because bundle apps that don't sync real inventory are a liability. Sleepmaxing exists because sleep brands deserved a quiz-powered bundle experience built for their specific workflow.

None of these came from market research or trend-chasing. They came from real friction — mine, or a merchant's, or a user's. That's the only filter that matters.

The products

✈️
AirPrice Chrome extension
Real-time pricing intelligence for Airbnb hosts. Comparable listings, optimal rate suggestion, and demand calendar — visible on every listing page.
🏠
STRInvest Chrome extension
Instant STR investment analysis on any Zillow or Redfin listing. Cap rate, cash-on-cash return, projected Airbnb revenue, and local STR regulations in one panel.
🏡
HomePilot Chrome extension
True monthly cost, real deal score, closing cost estimate, and negotiation signals on every Zillow, Redfin, and Realtor.com listing.
🚗
CarWise Chrome extension
NHTSA safety ratings, open recalls, and real market value decoded from any VIN — directly inside used car listings.
💼
JobPilot Chrome extension
AI-written cover letters tailored to every job posting. Works on LinkedIn, Indeed, and any job board. One click.
📦
EZStock Shopify app
The Shopify Stocky replacement. Inventory management, supplier tracking, and purchase order workflow — everything Stocky had, plus more.
🚀
EZDrop Shopify app
Run viral product drops with a referral-powered waitlist. Customers share to move up the queue. Free plan available.
PopBoost Shopify app
7 conversion widgets — announcement bar, free shipping bar, social proof popups, countdown timer, product badges, stock countdown, exit-intent — at $19/month flat.
🎁
EZBundle Shopify app
Fixed and mix-and-match bundle builder with real inventory sync. Bundles that don't oversell. Free plan available.
😴
Sleepmaxing Shopify app
Sleep product quiz and automatic bundle discounts for Shopify sleep brands. Personalized recommendations, higher AOV.

What I believe about software

🎯
One job, done exceptionally
I don't build platforms. I build tools. Each product does one thing and does it better than anything else available.
🔒
Privacy by default
Your data is yours. I request only the permissions each product actually needs and never sell user data to third parties.
🛠️
Actively maintained
When websites change, I ship fixes. These aren't abandoned projects — they're tools I rely on myself, so they stay current.
💸
Free to start, always
Every product has a meaningful free tier. You should see the value before you pay for anything.

Questions or feedback?

I read every email and respond personally — no support bots, no ticketing systems, no waiting.

[email protected]