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IsDown.app VS Nessus

Compare IsDown.app VS Nessus and see what are their differences

IsDown.app

When a vendor goes down, does your team find out in seconds or after users start complaining? IsDown monitors 6,000+ official status pages and alerts your team within seconds across Slack, PagerDuty, Datadog, and more. 14-day free trial

Rating
0 reviews
Pricing
Paid Free trial $27 / Monthly (Starter)
Alternatives Is it good?
Nessus

Nessus Professional is a security platform designed for businesses who want to protect the security of themselves, their clients, and their customers.

Rating
0 reviews
Alternatives Is it good?
OutageDeck
Check the cloud and SaaS vendors your product depends on without opening every status page. Official-source timelines, observed uptime history, and alerts to email, Slack, Teams, Discord, or webhooks. Five-provider email alerts are free. sponsored

Which is more popular?

Based on our record, IsDown.app seems to be more popular. It has been mentioned 6 times since March 2021.

social mentions
6 vs 0
Monitoring Tools popularity
26% vs 74%
alternatives listed
120 vs 240+

Base details

Website, pricing, platforms and company facts side by side.

IsDown.app
Nessus
Website isdown.app tenable.com
Pricing
Paid Free trial $27 / Monthly (Starter) Official pricing
—
Platforms
Web
—
Company Startup from Portugal · 2020 —
Listed in
Monitoring Tools Cloud Monitoring Notifications And Alerting Website Monitoring Status Pages Hosted Status Pages SRE DevOps Tools DevOps Services Developer Tools +7
Security Web Application Security Vulnerability Scanner Monitoring Tools +1

About IsDown.app and Nessus

In their own words, as submitted to SaaSHub.

IsDown.app
Nessus

IsDown was built out of frustration at 4 AM. Nuno Tomas, founder and on-call engineer, spent 30 minutes debugging an alert before realising the cloud provider had an outage posted on their status page, but nobody was watching it. That night, he decided there had to be a better way. Today, IsDown...

Read more about IsDown.app

No description of Nessus yet.

Features and specs

What each product offers, as listed by its team.

IsDown.app 21 features
Nessus 7 features
  • Status Dashboard
  • Multiple Team Boards
  • Slack App
  • Zapier Integration
  • Scheduled maintenances feed
  • Weekly Digest
  • Datadog Integration
  • Uptime Monitoring
  • Keyword Monitoring
  • SSL Monitoring
  • PagerDuty Integration
  • Custom Endpoint Monitoring
  • Public Status Pages
  • Private Status Pages
  • Early Outage Detection
  • SSO / SAML
  • Microsoft Teams Integration
  • Incident.io Integration
  • Historical Uptime Data
  • MCP Server
  • Multi-region Monitoring
  • Comprehensive Vulnerability Coverage
    Nessus offers an extensive database of vulnerabilities, allowing it to identify a wide array of security issues across different environments, including networks, operating systems, applications, and devices.
  • Regular Updates
    Nessus regularly updates its plugin library to include the latest vulnerabilities, ensuring that it can detect new threats as they emerge.
  • User-Friendly Interface
    The Nessus interface is designed to be intuitive and user-friendly, making it accessible for users of varying technical expertise.
  • Customizable Scans
    Nessus allows users to customize scans to focus on specific areas, devices, or types of vulnerabilities, providing greater flexibility and precision.
  • Extensive Reporting and Analytics
    Nessus offers detailed reporting and analytics capabilities, helping users understand the state of their security posture and prioritize remediation efforts.
  • Automation Capabilities
    Nessus supports the automation of scanning and reporting processes, which helps maintain ongoing security assessments without requiring constant manual intervention.
  • Integration with Other Tools
    Nessus integrates well with other security tools and systems, such as SIEMs, making it a versatile component of a broader security ecosystem.

Possible disadvantages

  • Cost
    Nessus can be expensive, particularly for smaller organizations or those with limited budgets, as licensing fees can add up based on the number of assets being scanned.
  • Resource Intensive
    Nessus scans can be resource-intensive, potentially impacting network performance and requiring significant computational resources to conduct thorough assessments.
  • False Positives
    Like many vulnerability scanners, Nessus may sometimes produce false positives, which can lead to unnecessary remediation efforts and wasted resources.
  • Learning Curve
    Despite its user-friendly interface, fully leveraging all of Nessus's advanced features and capabilities can require a significant learning curve.
  • Limited Free Version
    The free version of Nessus, Nessus Essentials, is limited in its capabilities and is intended for individual use or small networks, which may not be sufficient for larger organizations.
  • Potential Over-Reliance
    Organizations might become overly reliant on Nessus for vulnerability management, potentially neglecting other important aspects of a comprehensive security strategy.

Videos

Walkthroughs and reviews on video.

IsDown.app 0 videos + Add
Nessus 3 videos + Add

No IsDown.app videos yet. You could help us improve this page by suggesting one.

LABS 17 Vulnerability Analysis Using the Nessus REVIEW

More videos

  • - What is Nessus? | Explaining vulnerabilities in a Web Application
  • - Getting Started with Nessus Vulnerability Scanner - 2018

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
IsDown.app
Nessus
26% 26%
Monitoring Tools
74% 74%
0% 0%
Security
100% 100%
100% 100%
Website Monitoring
0% 0%
0% 0%
Web Application Security
100% 100%

Questions & Answers

As answered by people managing IsDown.app and Nessus.

What makes your product unique?

IsDown.app's answer

IsDown monitors official vendor status pages directly, not just crowdsourced reports. This means alerts include real incident context: what broke, which components are affected, and real-time resolution status. Not just "something is down." Combined with crowdsourced early detection signals, IsDown can catch outages before vendors acknowledge them. In January 2026 alone, IsDown detected 101 incidents that vendors never officially reported. Every team monitoring cloud services already has uptime tools that ping their own URLs. IsDown tells you what is happening with the third-party services your stack depends on, before your users feel it.

Why should a person choose your product over its competitors?

IsDown.app's answer

Three reasons:

  1. Coverage: 6,000+ services monitored. If your vendor has a status page, IsDown monitors it.
  2. Speed and context: Alerts go out within seconds of an incident, with full context including affected components, official vendor description, and real-time updates. Not just a notification that something is wrong.
  3. IsDown does not replace your existing tools, it completes them. UptimeRobot and Pingdom tell you your own services are down. IsDown tells you which of your third-party vendors caused it, and exactly what is happening on their end. Setup takes 5 minutes. No engineering required.

How would you describe the primary audience of your product?

IsDown.app's answer

IsDown is built for IT managers, DevOps engineers, and SREs at companies that rely on multiple cloud and SaaS services, which means any team running on cloud infrastructure. The core audiences are DevOps and SRE teams who are on-call and need to know instantly when a third-party service causes an incident; IT managers responsible for vendor oversight and SLA compliance; MSPs and agencies managing cloud infrastructure for multiple clients; and engineering teams who want to stop wasting time debugging problems that turn out to be vendor outages. Customers span SaaS companies, schools, DevOps agencies, and enterprise IT teams across industries.

What's the story behind your product?

IsDown.app's answer

IsDown was built out of frustration at 4 AM. Nuno Tomas, the founder, was on-call when a PagerDuty alert woke him up. After 30 minutes of debugging, he realised the problem was not his code. It was the cloud provider. They had posted an outage on their status page, but nobody on the team was watching it. That night, he decided there had to be a better way. He built the first version of IsDown so his team would never be the last to know about a vendor outage. Founded in 2020, IsDown has since grown to monitor 6,000+ services, perform over 1 billion status checks, detect 520,000+ outages, and send 5.2 million+ notifications. The same problem Nuno solved for his team that night is now solved for IT, DevOps, and engineering teams around the world.

Who are some of the biggest customers of your product?

IsDown.app's answer

IsDown is used by IT, DevOps, and engineering teams across SaaS companies, MSPs, DevOps agencies, schools, and enterprise IT departments.

Which are the primary technologies used for building your product?

IsDown.app's answer

IsDown is a web-based SaaS application. The core product runs on modern cloud infrastructure with multi-region monitoring across US, EU, and Asia to ensure reliable status checks and fast alert delivery worldwide. IsDown integrates directly with Slack, PagerDuty, Datadog, Microsoft Teams, Incident.io, FireHydrant, Grafana, Rootly, Zendesk, and more, connecting alerts to wherever your team already works. For teams using AI assistants, IsDown offers an MCP (Model Context Protocol) Server that allows querying IsDown data directly from AI tools like Claude or ChatGPT.

User comments

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Reviews and articles

External articles and on-site reviews we used to compare the two products.

IsDown.app no reviews yet
Nessus no reviews yet

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

IsDown.app 6 mentions
Nessus 0 mentions
  • Top 10 Statuspage.io Alternatives in 2025
    A specialized status page aggregator designed for internal team communication and vendor dependency monitoring. Unlike public status page creators, IsDown monitors 4,500+ third-party vendor status pages (AWS, Azure, GitHub, Stripe, etc.)... - Source: dev.to / 10 months ago
  • Build or Buy Your Third-Party Monitoring System: Decision Guide
    Consider your growth trajectory. Will you be monitoring 10 services or 1000? Commercial solutions like IsDown are designed to scale effortlessly, while custom solutions often require significant rework as requirements grow. - Source: dev.to / about 1 year ago
  • Best Downdetector Alternatives for Outage Monitoring in 2025
    Among them, IsDown stands out as a robust, business-focused solution. With real-time alerts, aggregated data from thousands of services, seamless integrations, and customizable dashboards, IsDown helps businesses stay ahead of outages... - Source: dev.to / about 1 year ago

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Tracking Nessus since Mar 2021.

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