Ghost Comment — Anonymous feedback for your product

// why I built this

I built 30 apps in 3 months.
Revenue: $0.

I had no idea what users thought. No feedback. No direction. That's why good products die.

So I built Ghost Comment. One component. Real feedback. Anonymous. Built it for myself — which means it solves a problem engineers actually have.

Try Free Read Docs →

No credit card · Free plan is free forever

1<!-- </body> の直前に貼るだけ -->
2<script
3  src="https://ghost-comment.vercel.app/widget.js"
4  data-project-id="YOUR_PROJECT_ID"
5></script>

Full integration guide at /docs

< 2min

setup time

50KB

widget size

Firebase configs

frameworks

// you could build it. you shouldn't.

Spend those 20 hours on your product instead

Firebase + API + UI + maintenance is 20+ hours minimum.
Ghost Comment takes 2 minutes.

	Build it yourself	Ghost Comment
Setup time	20+ hours (Firebase + API + UI)	✓2 minutes
Infrastructure	You maintain Firebase	✓We handle it
AI sentiment	Build Anthropic API integration	✓Built into dashboard (Pro)
Framework support	Build your own adapters	✓HTML / React / Next.js / Vue
Monthly cost	Firebase + dev time	✓$0 Free / $10 Pro
Code ownership	Full control	Hosted only

Features

⚡

2 minutes to ship

One script tag or one React component. No Firebase config, no server, no infrastructure decisions.

👻

Fully anonymous

No login. No name required. Anonymous means honest. We store text, device type, and page URL — nothing else.

🧠

Claude AI sentiment

Auto-classify feedback as Positive / Negative / Neutral. Pro users get a weekly Claude-generated digest every Monday.

📊

Dashboard

Daily bar chart, sentiment pie chart, CSV export. Open your browser and everything is there.

🔔

Slack alerts (Pro)

Instant Slack notification the moment feedback arrives. Paste your webhook URL, done.

📈

Industry benchmark (Pro)

Compare your sentiment scores against projects in the same category. Data your self-hosted solution can never produce.

// what a self-hosted solution can't do

Why competitors can't replicate this

Anyone can build the basic collection feature.
But the insights from thousands of projects? That's not replicable.

Data network effect

As more projects join, industry-wide trends emerge — "SaaS apps average 14% negative rate." No solo implementation ever produces this.

Weekly AI digest (Cron)

Claude summarizes last week's feedback every Monday. "Main theme: confusing UI / 3 mentions." No dashboard visits required.

Anonymous session tracking

Detects duplicate submissions without cookies or PII. Requires device fingerprinting knowledge to build yourself.

Slack / Linear integration

Convert negative feedback into Linear issues. Self-hosting means wiring 3 different APIs together.

3 steps

Create a project

Paste one line

A script tag, or the GhostComment component. The docs have examples for every framework.

Feedback arrives

Users click 👻 → submit anonymously → instantly in your dashboard. AI classifies the sentiment.

What it looks like

your product

Send Feedback

😡😕😐🙂😍

Tell us what you really think...

Submit

👻

color / position / prompt are customizable → Docs

Pricing

Unusually honest for an AI tool — Free actually works

Free

Free forever

✓ 1 project
✓ 30 feedbacks / month
✓ Dashboard + charts
✗ AI sentiment analysis
✗ Weekly AI digest
✗ Slack notifications
✗ CSV export

Start Free

Recommended

Pro

$10/mo

Cancel anytime

✓ Unlimited projects
✓ Unlimited feedback
✓ Claude AI sentiment analysis
✓ Weekly AI digest (every Monday)
✓ Slack notifications
✓ CSV export
✓ Remove "Powered by" badge
✓ Industry benchmark comparison

Start Pro

// one last thing

Your users have opinions.
They just won't tell you —
unless it's anonymous.

Add Ghost Comment today.
By tomorrow you'll know what your users actually think.

Start Free Today

No credit card · 2-minute setup