Uptime · Security · Speed — nothing to install

Your site seen from the outside. Up, safe and fast, in one panel.

We watch 24/7 whether the site is up, audit it the way an attacker would see it, and measure the speed your customer feels.

You find out before they complain.

No card · 1 free monitor forever · 2-minute setup

See how it works →
Panel · example
example.com
up
Uptime 30 days 99,97%
Security score B · 84/100

Latest checks · 1 min
TLS / Certificate ok
CSP without unsafe-inline medium
Privacy · banner after tracking high
Speed · mobile 62/100
passive check
Checking now

Only what any visitor already sees. Active auditing requires your authorization.

Partial score
84/100
1 HIGH 2 MEDIUM

Passive check, without touching your server.


Cookie banner fires after tracking high
CSP without unsafe-inline medium
Security headers 2 missing

The other 57 probes and the weekly history come with the paid plans. The uptime monitor is free forever — it is the only thing that needs time passing to exist.

Create a free account and turn the monitor on
3h12

is how long a site stays down, on average, before anyone notices without monitoring.

1 min

is the interval of our checks. You know before your customer picks up the phone.

60+

security checks running every week, without you asking.

Already monitoring with us
Module 01 · Uptime

Know it went down before your customer does.

A check every minute, from the outside, in a real browser — and confirmation of the outage before waking you up.

Alert Warning in 1 minute by email, Telegram, Slack and 5 more channels.
Flow Tests real login and checkout, not just whether the server answers.
Noise Confirms the outage before waking you: no false alarms at 3 a.m.
SSL Warns 30 days before the SSL certificate expires.
Status Public status page so your customer stops asking whether it is down.
See what Uptime tests →
example.com
Checks every 1 min up
Uptime 30d 99,97%
Incidents 01
Down 2min
30 days ago today

21:04 down — HTTP 502
21:06 back — 2 min down, nobody noticed
Telegram · now

example.com is down — HTTP 502, confirmed in 2 checks.

Module 02 · Security Audit

See your site the way an attacker sees it.

More than sixty external checks every week, across seven layers — from TLS to leaked credentials.

Score A score from A to F, with what to do to move up, in the right order.
Exposure Finds what was left exposed: open admin panel, leaked password, forgotten backup.
Privacy Checks privacy law: cookies firing before consent, forms without notice.
Report A PDF ready for the board or for your client, with your brand.

TLS · headers · exposure · leaked credentials · privacy · DNS · subdomains

See the 7 audited layers →
example.com
Weekly audit · Aug 06
84/100
1 HIGH 2 MEDIUM 59 OK

-6 points since the previous audit. 1 new finding.


Cookie banner fires after tracking high
CSP without unsafe-inline medium
Subdomain named after a sensitive service medium
TLS / Certificate · 74 days to expiry ok

7 layers · 60+ checks Audit PDF →
Module 03 · Performance

Know when the site gets slow — before losing a sale.

The same metrics Google uses to rank, measured every day on mobile and desktop.

Vitals Daily Core Web Vitals, with history and week-over-week comparison.
Pages Measures the pages that make money: home, product, checkout.
Cause Tells you when the drop is yours — and not the visitor connection.
See the metrics we measure →
example.com/product
Daily measurement · mobile and desktop
Mobile
Desktop

LCP · largest contentful paint 3.4 s
CLS · layout shift 0.08
FCP · first contentful paint 1.8 s
TBT · total blocking time 620 ms
INP · interaction to next paint 210 ms
0–49 poor 50–89 needs work 90–100 good

The panel

The whole operation, one screen.

Availability, security score and speed — without switching tabs to understand what happened.

See the live panel →
Sentinela Operations Center: availability, security score and performance on the same screen, with the incident timeline below.

Who already uses it

Two clients, the same sentence: I knew first.

Testimonials from real clients, published with permission.

“O site caiu num sábado à noite e eu soube pelo Telegram antes de qualquer cliente abrir o WhatsApp. Voltou em quatro minutos e ninguém percebeu.”

Rodrigo Sensever
OWP

“Antes eu tinha três ferramentas e nenhuma resposta. Hoje mando um PDF com a nota subindo e o cliente entende sozinho por que paga a manutenção.”

Jonas Perreira
Brivia

For agencies and freelancers

Charge for maintenance and show why.

Every client site in a single account. A monthly PDF report with your brand, showing the score climbing from C to A — the client understands on their own why they pay the retainer.

See the agencies page →

Plans

A plan that grows with you. No per-event billing.

Uptime, Security Audit and Performance included in every paid plan. Priced in reais, with a Brazilian invoice.

2 months free on the yearly plan
Free
R$ 0 forever

To try it out or for 1 personal site.

  • Free forever, no card:
  • 1 uptime monitor
  • 5-minute interval
  • 1 public status page
  • Email alerts
Create free account
Pro
R$ 49 R$ 41 /month
R$ 490/year · 2 months free

For a freelancer, solo dev or single site.

  • Everything in Free, plus:
  • 20 uptime monitors
  • 1-minute interval
  • Flow monitor: login and checkout
  • 4 audits per month (weekly)
Create free account
Agency
R$ 399 R$ 332 /month
R$ 3.990/year · 2 months free

For an agency, MSP or consultant.

  • Everything in Business, plus:
  • 400 uptime monitors
  • 50 performance pages
  • Multi-client with workspaces
  • Estimated financial risk in money
Talk to sales
See the full comparison and add-ons → Change plans or cancel in one click, without talking to anyone.

Common questions

Before creating the account.

Did not find yours? Talk to us — a person answers.

Do I need to install anything on my server?

No. We observe from the outside, like any visitor. You only give us the domain — no agent, no plugin, no access to your server.

Is this a pentest?

No. It is automated, recurring external observation. It complements the human pentester; it does not replace one.

Will the audit take my site down?

No. The checks are low impact and rate limited. No destructive testing, no brute force.

How many sites fit in my plan?

Free: 1. Pro: 20 monitors. Business: 50. Agency: unlimited. Past the limit, we warn you before charging anything.

Why do I have to authorize the domain before auditing?

Because active auditing is only legitimate with permission from whoever controls the domain. It is one click, and it is recorded.

Are you compliant with privacy law?

Data hosted in Brazil, a designated DPO and a dedicated probe to check your own compliance. Contract and policy in Portuguese.

Does it work with WordPress / Next.js / SPA / Cloudflare?

Yes. Since we look from the outside, what runs behind it does not matter. On SPAs we use a real browser to measure what the user sees.

Do I have to replace the tools I already use?

No, but you usually stop needing two or three. "It is down", "a header is missing" and "it is slow" start living in the same panel, with the same history, in the same plan.

Can I take my data with me?

All of it: PDF, CSV, API and webhook. No lock-in — the history is yours, including on the way out.

Can I cancel whenever I want?

One click, without talking to sales. You export the whole history before leaving — PDF, CSV or API.

Start today

An uptime monitor, forever.

No card, no deadline, no silent auto-charge. You move up a plan when you need to — and not before.

01 Add the domain. No agent, nothing to install.
02 Choose where you want to be warned: email, Telegram, Slack, webhook.
03 In 1 minute the first monitor is already running.