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 NowWhat 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
🔥 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
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
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
UNLIMITED
Unlimited
$999
/ month
Unlimited Licenses
- Everything in Agency
- White-label Slack reports
- Unlimited GA4 properties
- Priority support
- Looker Studio dashboard template
✦ 14-day free trial · Cancel anytime
See It In Action
WHAT LANDS
IN YOUR SLACK.
Real Slack notifications from Ninjalens. No mockups — these are actual screenshots.
🚨
JS Error Detection
Checkout JS errors spike — caught within the hour
① Critical alert fires immediately · ② Recovery notification sent automatically when errors return to normal
📊
Daily AI Report
Every morning — metrics, AI analysis, and next actions
Left: normal day · Right: revenue anomaly detected with AI-generated action plan
Demo Video
SEE IT IN ACTION.
JS error detection + daily AI report — exactly what lands in your Slack.
Optional Add-on
SETUP SERVICE
From GCP configuration to Slack and GTM script installation — we handle the entire initial setup for you.
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.