UptimeRobot is practically the default answer when someone needs free uptime checks, and it earned that position. This page will not try to convince you UptimeRobot is bad, because it is not. It will show you two tools solving two different problems, so you can pick the right one for your situation.
How do the two models differ?
The root difference is the vantage point.
UptimeRobot watches from the outside: check locations around the world call your website and record alive or dead. That model answers one question extremely well: can users out there reach the site?
AgentWatch covers both sides. Outside, it runs HTTP, TCP, ping and SSL checks like any standard website uptime monitoring tool. Inside, an agent on the server reads CPU, RAM, disk, systemd service status and Docker container health. When your site goes down, you do not just learn that it is down: you see the context immediately, a full disk, exhausted memory or a service that just died.
The second difference is the market each serves. UptimeRobot is built for a global audience: USD pricing, English documentation, integrations with the international ecosystem. AgentWatch is built for teams operating in Vietnam: alerts into a Zalo group chat (Zalo being Vietnam’s most widely used messaging app), pricing listed in Vietnamese dong, and a Vietnamese-language product and support.
AgentWatch vs UptimeRobot, side by side
| Aspect | AgentWatch | UptimeRobot |
|---|---|---|
| External uptime checks (HTTP, TCP, ping, SSL) | Yes, from infrastructure in Vietnam | Yes, from a global multi-location network |
| Inside-the-server monitoring (CPU, RAM, disk) | Yes, via agent | No, external checks only |
| systemd service status | Yes | No |
| Docker container health (3-layer model) | Yes | No |
| Zalo alerts | Yes, the default channel | No |
| Other alert channels | Email live, Telegram coming soon | Broad integration ecosystem, many international channels |
| Public status page | Yes, one per account, custom domain on higher tiers | Yes |
| Pricing and billing | Listed in VND, from 49,000 VND/month, free plan available | Listed in USD, free plan available |
| Product and support language | Vietnamese | Primarily English |
| Brand maturity | New product, in beta | Long-established brand, large community |
The table is honest in both directions. If a line on the right column matters more to you, choose accordingly.
What does AgentWatch see that external checks cannot?
An external check only sees the final symptom: the site stopped responding. Most incidents have a longer backstory, and that backstory lives inside the server:
- A disk filling up with logs until the database stops writing.
- Memory leaking day after day until the OOM killer picks exactly the wrong process.
- A container crash-looping through restarts, giving users intermittent errors that are impossible to reproduce.
- A background worker or cron job dying silently, with no URL anyone could check.
The AgentWatch agent sees all four and alerts before they turn into downtime. The agent is a single binary that opens no ports, takes no remote commands, installs with one command and removes cleanly with four. The full description lives on the agent page.
When is UptimeRobot still the right call?
Pick tools by problem, not by comparison articles. UptimeRobot fits better when:
- You need to confirm reachability from multiple geographic regions, say your customers are in Europe and the US.
- You genuinely only need external uptime checks, and your workflow is already wired into their ecosystem’s integrations.
- You prefer a brand proven over many years to a newer product.
On the other hand, if your servers and customers are mostly in Vietnam, your on-call team lives in Zalo, and you have ever had to SSH into a box just to figure out why a check turned red, then the biggest chunk of AgentWatch’s value sits exactly there.
How do you switch?
No need to cut the cord on day one. The lowest-risk path is running both:
- Create a free account and re-enter the URLs you monitor as HTTP checks.
- Install the agent on one or two important servers with the one-line command.
- Connect your team’s Zalo group and live with both systems for a few weeks.
Once the Zalo alerts and the inside-the-server metrics have proven their worth, decide what to keep. Plan details from Free up to Business at 399,000 VND are on the pricing table, with the product overview on the homepage. During the beta, new accounts run the Business plan free, so the total cost of this experiment is a few minutes of setup.