GA4 AI Monitoring — Built in Japan

CATCH SITE
PROBLEMS
BEFORE
YOUR CLIENTS DO

Ninjalens watches your clients' GA4 data 24/7 — detecting statistical anomalies, JS errors, and revenue drops — then sends AI-powered analysis straight to Slack. Under your brand.

Start 14-Day Free Trial See How It Works
14
Day Free Trial
$0
Infrastructure Cost
10
Clients per Agency Plan
24/7
Automated Monitoring
The Problem

Your clients notice problems before you do.

GA4 dashboards are overwhelming
Nobody has time to check GA4 every morning. Anomalies go unnoticed for days.
JS errors are invisible
Checkout breakages, cart errors, payment failures — silently costing your clients revenue. Existing error monitoring tools are built for developers and too complex to deploy.
Clients call you. Not the other way around.
Reactive support damages trust. Proactive detection wins long-term retainers.
#ninjalens-alerts
🥷
Ninjalens Today at 8:00 AM
🚨 Anomaly detected for client-shop.com
📊 Daily Report — Feb 26
Sessions▼ 34% vs last week (Z: -2.8)
Revenue▼ $1,240 (-41%)
JS Errors (Checkout)↑ 18 errors detected
CV Rate▼ 0.8% (was 2.1%)
🤖 AI Analysis: Checkout JS error likely blocking purchases. Immediate review recommended.
Features

Everything your agency needs
in one tool.

No BigQuery. No infrastructure. No engineers needed.

STATISTICAL ANOMALY DETECTION
Not just "down 10%" — Ninjalens uses Z-Score analysis to distinguish real anomalies from daily noise. Moving averages and week-over-week comparisons give you statistical confidence.
Z-Score + Moving Average
REAL-TIME JS ERROR DETECTION
A lightweight script detects JS errors, GTM failures, and 3rd-party breakages by page group — checkout, cart, product, homepage. Alerts fire via Slack within the hour.
Realtime API + Page Groups
AI-POWERED ANALYSIS
Gemini AI analyzes your GA4 data and tells you not just what happened — but why, and what to do next. Every daily report includes actionable recommendations.
Gemini 2.5 Flash
WHITE-LABEL REPORTS
Send Slack reports under your agency's brand name. Your clients think you built it. Charge them for the monitoring service and keep the margin — 10 licenses per Agency plan.
Agency Plan Feature
Setup

Live in 30 minutes.

No server. No code. Just a Google Spreadsheet.

01
Copy the Spreadsheet
Get your license key and make a copy of the Ninjalens Google Spreadsheet to your Drive.
02
Enter your API Keys
Add your GA4 Property ID, Gemini API key, and Slack Webhook URL to the Config sheet.
03
Add Error Tracking Script
Paste a one-line script tag to your site. Ninjalens auto-generates it from your page group settings.
04
Reports Come to You
Set your daily trigger time. Every morning, AI analysis arrives in Slack. Automatically.
The Cost of Waiting

Every hour you don't know,
your client is losing money.

A broken checkout. A failed payment script. A GTM error blocking conversions. The damage starts the moment it breaks — not the moment you find out.

Real scenario
Friday night. Checkout breaks. You find out Monday morning.
Fri 11 PM
JS error silently breaks the checkout button. Orders stop.
Sat — Sun
Weekend traffic. Peak shopping hours. Every visitor hits a dead end.
Mon 9 AM
Your client calls. "Sales are down 80% this weekend. What happened?"
~58 hours
Time between the break and detection. Every hour: lost revenue, lost trust, lost clients.
⏱️
58 hrs
Average time to detect a critical site error without monitoring
💸
×58
Hourly revenue loss multiplied by every hour you stay blind
📞
>3×
When clients call you first, churn risk multiplies. Proactive beats reactive every time.

Ninjalens detects anomalies and JS errors within the hour — and sends the analysis directly to Slack before your client notices.

Start Monitoring Now
What You Gain

Stop the loss.
Start building trust that compounds.

Detection isn't just about avoiding damage. It's about becoming the agency your clients never want to leave.

🤝
Client trust that's hard to replace.
When you alert a client about an issue before they notice it, something shifts. You're no longer a vendor. You're a partner who's watching their back. That positioning is worth more than any feature list.
🔄
Renewals that don't require a pitch.
Agencies that detect and solve problems proactively don't need to justify their retainer at renewal time. The value is visible every month — in Slack, in reports, in the issues that never became crises.
📈
A reason to expand the relationship.
Every alert you send is a proof point. Proof points open conversations. Conversations open upsell opportunities — more properties, more services, more trust.
🛡️
Churn protection built into your workflow.
Clients leave when they feel their agency isn't paying attention. Daily AI reports and real-time alerts make it structurally impossible to look inattentive — even on your busiest days.
⭐
The agency that caught what others miss.
Word of mouth in agency circles is powerful. Being the team that found the checkout bug before the weekend ended is a story your clients tell. That reputation compounds.
Why Spreadsheet?

Spreadsheet.
On purpose.

You saw "Google Spreadsheet" and felt a flicker of doubt. That's fair. Here's why it's a feature, not a flaw.

💡
SaaS isn't always the answer.
The right question isn't "is it a SaaS?" — it's "does it solve the problem?" Ninjalens runs on Google's serverless infrastructure. The spreadsheet is the interface. Google is the engine.
🏗️
Google's infrastructure. Not ours.
Google Apps Script runs on the same infrastructure as Gmail and Google Drive. No deployment, no downtime, no ops team needed. The reliability guarantee comes from Google — not a startup's server.
🔒
Your data never leaves your Google account.
GA4 data, API keys, AI reports — all processed inside your own Google environment. We never see your analytics. We never touch your credentials. No third-party server receives your client data.
🔓
Cancel anytime. Keep everything.
Your spreadsheet, your data, your history — it stays in your Google Drive forever. No vendor lock-in. No "export before you leave" panic. If Ninjalens disappeared tomorrow, your setup would still be there.
📊
You control the costs. All of them.
Traditional SaaS bakes infrastructure costs into your bill — invisibly. Ninjalens doesn't run servers, so we don't charge for them. You bring your own Gemini API key. You set the usage cap. Your bill is predictable because you own every variable.
Pricing

Simple, transparent pricing.

No per-event fees. No hidden costs. Your Gemini API key means you control the AI spend.

Starter
$49
/ month
1 License · 1 GA4 Property
  • Daily AI-powered Slack reports
  • Statistical anomaly detection (Z-Score)
  • Real-time JS error monitoring
  • Email notifications
  • Multi-language support (EN / JA)
  • Setup guide included
Start Free Trial
🔥 FOUNDER — 3 spots only
Founder
$499 / mo after launch
$249
/ month · locked forever
10 Licenses · 10 GA4 Properties
3 spots left
  • Everything in Agency
  • White-label Slack reports
  • Priority support
  • Looker Studio dashboard template
  • Price locked forever at $249
Apply for Founder Access
EARLY — 10 spots
Early
$399
/ month
10 Licenses · 10 GA4 Properties
  • Everything in Agency
  • White-label Slack reports
  • Priority support
  • Looker Studio dashboard template
  • Price locked at $399
↳ Opens after Founder spots fill Coming Soon
STANDARD
Agency
$499
/ month
10 Licenses · 10 GA4 Properties
  • Everything in Starter ×10
  • White-label Slack reports
  • Your brand name on every report
  • $49.9 per client — resell at your rate
  • Priority support
  • Looker Studio dashboard template
↳ Full launch pricing Coming Soon
UNLIMITED
Unlimited
$999
/ month
Unlimited Licenses
  • Everything in Agency
  • White-label Slack reports
  • Unlimited GA4 properties
  • Priority support
  • Looker Studio dashboard template
↳ Launching with Agency Coming Soon

✦ 14-day free trial · Cancel anytime

FAQ

Common questions.

Yes — you bring your own Gemini API key. This means your data stays in your own Google ecosystem, and costs are typically under $10/month even for 10 clients. This is also a strong privacy selling point with your clients.
You receive one license key that can be activated on 10 separate Google Spreadsheets — one per client. Each client gets their own monitoring setup. With the white-label feature, reports arrive in their Slack under your agency's brand name.
None. Ninjalens runs entirely on Google Apps Script — Google's serverless infrastructure. No deployments, no downtime, no DevOps. If you can use Google Sheets, you can run Ninjalens.
Ninjalens only sends numerical GA4 metrics to Gemini — no PII, no customer names, no personal data. Your API keys and property IDs stay in your own Google Spreadsheet and are never stored on our servers.
View all FAQs (60+ questions)

START MONITORING.
BEFORE THEY CALL.

14-day free trial · 7-day money-back guarantee · Cancel anytime

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