Catalog № 01 — 2026 Actively maintained
Toolsin the
catalog

Small tools that
do one job.

Six Chrome extensions and six Shopify apps, each built to do one thing well — for home buyers, job seekers, Airbnb hosts, and the merchants running a store. Built and maintained by one person in San Francisco. Free to start.

Try a free tool → Browse the catalog
6Chrome ext.
6Shopify apps
6Free tools

The Index

13 products · 9 free tools · where each runs

Every tool in one table. One job each, priced honestly — free tiers, free tools, and paid plans from $19/mo.

PartToolFunctionWherePrice
№01 MarjnTrue profit margins inside SidekickShopify №02 EZstockInventory & purchase ordersShopify №03 EZDropViral product drops & waitlistsShopify №04 QuizzoProduct quiz & bundle discountsShopify №05 PopBoost7 conversion widgets in oneShopify №06 EZBundleFixed & mix-and-match bundlesShopify №07 Anti-SlopAI text & design detectorChromeFree №08 HomePilotHome-buying analysis on listingsChromeFree №09 JobPilotAI cover letters for every jobChromeFree №10 STRInvestShort-term rental ROI analysisChromeFree №11 AirPriceAirbnb pricing intelligenceChromeFree №12 CarWiseVIN decode, recalls & valueChromeFree №13 RetryReal-time money-leak alertsShopify

Free Bench Tools

9 tools · no signup · in your browser

Instant web tools you can use right now — nothing to install, no account, no cost. See the full free-tools page →

PartToolFunctionWherePrice
Shopify inventory & operations
№F1 Stocky ConverterRescue Stocky PO history before Aug 31WebFree №F2 CSV CheckerCatch variant-deleting product importsWebFree №F3 Stockout Cost CalculatorSee what out-of-stocks cost youWebFree №F4 Days of Stock CalculatorWhen you run out, when to reorderWebFree
Store health & growth
№F5 Store AuditSpeed, SEO & conversion checkWebFree №F6 AI Shopping CheckerGet recommended by ChatGPT & AIWebFree №F7 Checkout Deadline CheckerBeat the 2026 checkout deadlineWebFree №F8 Merchant Center CheckerCatch GMC suspension riskWebFree
AI & content
№F9 AI DetectorScore & rewrite AI textWebFree

Chrome Extensions

6 co-pilots · one job each

Chrome extensions for home buying, car research, Airbnb pricing, STR investment analysis, AI-powered job applications, and AI-content detection. Each purpose-built for one job.

№07Chrome
Anti-Slop
Detect AI-written text and AI-generated web design on any page. Get a human-read score, the exact tells, and a one-click fix.
  • 0–100 score for text & design
  • Flags AI phrases, gradients & layout tells
  • AI rewrite + corrected CSS
№08Chrome
HomePilot
Know before you offer. True monthly cost, deal score, closing costs & negotiation strategy on every Zillow, Redfin & Realtor.com listing.
  • True monthly cost with maintenance reserve
  • Price vs. Zestimate deal score
  • Closing costs, comps & seller equity
№09Chrome
JobPilot
AI cover letters tailored to every job posting. Auto-fill applications and track where you applied — all in one click.
  • AI cover letter in one click
  • Works on LinkedIn, Indeed & more
  • Application tracker + CSV export
№10Chrome
STRInvest
Instant short-term rental investment analysis on any Zillow, Redfin, or Realtor.com listing. Know your ROI before you call an agent.
  • Cap rate & cash-on-cash return
  • Projected STR revenue
  • Local regulation lookup
№11Chrome
AirPrice
Real-time pricing intelligence for Airbnb hosts. See what comparable listings charge and get a specific nightly price recommendation.
  • 30+ comparable listings analyzed
  • Specific price recommendation
  • 6-weekend demand calendar
№12Chrome
CarWise
Decode any VIN in seconds — safety ratings, open recalls, real market value, and EPA fuel economy. Right inside any car listing.
  • NHTSA safety ratings & open recalls
  • Market value — private party to retail
  • EPA fuel economy & F&I guide

Shopify Apps

6 apps · on the Shopify App Store

Profit margins in Sidekick, bundle builder, FOMO popups, inventory management, product drops, and product quiz apps — each purpose-built for one job and available on the Shopify App Store.

№13Shopify
Retry
Real-time money-leak alerts for Shopify. Retry flags paid orders where the money got stuck — a stalled payout, or an order that never shipped — with the exact dollar at risk, and clears each alert itself the moment you fix it.
  • Catches stalled payouts & unshipped paid orders
  • Shows the exact dollar at risk, in real time
  • Alerts clear themselves — it never cries wolf
№01Shopify
Marjn
True profit margins for Shopify — landed cost and Meta ad spend folded into every product's margin, answered right inside Shopify Sidekick. Shopify shows revenue; Marjn shows what you actually keep.
  • Margin answers inside Shopify Sidekick
  • Landed cost + ad spend in the real margin
  • Free plan; Pro $19/mo with a 30-day trial
№04Shopify
Quizzo
Gamified product-finder quiz with automatic checkout discounts. Shoppers spin to win, get a curated bundle matched to their answers, and the discount applies automatically at checkout. Works for any product category.
  • Gamified spin-to-win quiz on your storefront
  • Automatic bundle discount via Shopify Function
  • No code — works with any theme
№03Shopify
EZDrop
Run limited product drops with a viral referral waitlist. Every signup gets a unique share link — referring a friend moves them up the queue automatically. Free plan available.
  • Robinhood-style referral queue
  • Live FOMO badge on your storefront
  • Automated launch email blast
№02Shopify
EZstock
Purchase orders & inventory management for Shopify. Manage suppliers, create purchase orders, forecast demand from sales velocity, and auto-update inventory when stock arrives. Free plan, paid from $19/month.
  • Purchase orders with PDF export
  • Demand forecasting from 30-day sales data
  • Auto-update Shopify inventory on receipt
№05Shopify
PopBoost
Replace 5 conversion apps with one. Social proof popups, countdown timers, stock alerts, product badges, free shipping bar, announcement bar, and exit-intent popup — all for $19/month.
  • 7 widgets, one lightweight app
  • FOMO popups, badges & countdown timers
  • Free plan — all 7 widgets included
№06Shopify
EZBundle
Product bundle builder that actually works. Create fixed bundles and mix-and-match collections with automatic discount codes at checkout. Boosts AOV 15–30%. Free plan available.
  • Fixed bundles & mix-and-match collections
  • Automatic discount codes — no manual entry
  • No theme code — installs in 60 seconds

Need a Shopify app that doesn't exist yet? Hire the developer behind these six apps →

Cut to spec

Built by someone who
needed these tools himself

Founded by Vladislav Gerasimchuk · San Francisco, CA · [email protected]

Spec № 1
One job, done exceptionally
Each tool is laser-focused on a single task. No bloat, no upsells inside the tool, no feature creep. Just the thing you installed it for.
Spec № 2
Privacy first
Your data stays yours. We don't sell it, don't mine it, and don't share it. Extensions only request the permissions they actually need.
Spec № 3
Actively maintained
When a site changes its layout, we ship a fix. When Chrome updates its APIs, we're already updated. These tools are used by us daily.
Spec № 4
Free to start
Every product has a meaningful free tier. Try it, see the value, then decide. No credit card required to get started with any of them.
Spec № 5
Chrome Manifest V3
All extensions are built on the latest Chrome MV3 standard — faster, safer, and fully compliant with Chrome Web Store policies.
Spec № 6
Real support
Questions or bugs? Email [email protected] and get a response from the person who built it — not a support bot.

Guides & How-Tos

From the workbench

In-depth guides for home buyers, job seekers, Airbnb hosts, and Shopify merchants.

EZBundle
Best Shopify Bundle App in 2026 — Compared
Read guide →
PopBoost
Best Shopify Social Proof App — Full Breakdown
Read guide →
CarWise
Best VIN Decoder Chrome Extension for Car Buyers
Read guide →
JobPilot
How to Write an AI Cover Letter That Gets Interviews
Read guide →
View all guides →

Frequently asked questions

The fine print
Q1
What is Extensions Market?
Extensions Market is a suite of Chrome extensions and Shopify apps built by indie developer Vladislav Gerasimchuk in San Francisco. Each tool is purpose-built for one job — home buying analysis, car research, Airbnb pricing, STR investment, lead generation, job applications, or Shopify store optimization.
Q2
Are the Chrome extensions and Shopify apps free?
Every product has a meaningful free tier. Chrome extensions like HomePilot, CarWise, AirPrice, and JobPilot are free to install with no credit card required. Shopify apps including EZBundle, EZDrop, PopBoost, and EZstock offer free plans. Paid plans start at $19/month.
Q3
What makes Extensions Market different from other tools?
Each product does exactly one job and does it well — no bloat, no upsells inside the tool, no feature creep. All Chrome extensions are built on Manifest V3 and only request the permissions they actually need. Because the tools are used daily by the developer, they stay updated when sites change their layouts or Chrome releases API changes.
Q4
Do you offer customer support?
Yes. Support is handled directly by the developer who built the product. Email [email protected] and you'll get a response from a real person — not a support bot.
Q5
Which browsers do the Chrome extensions support?
All Chrome extensions work on Google Chrome and Chromium-based browsers including Microsoft Edge and Brave. They're built on Manifest V3, the latest Chrome extension standard, and fully comply with Chrome Web Store policies.