Is this a full Datadog replacement?

No. GetPageSpeed Amplify is focused on NGINX, Varnish, PHP-FPM, MySQL and website uptime. If your needs are limited to the web-serving stack, it replaces Datadog's NGINX integration at a fraction of the cost.

How much cheaper is it?

Datadog Pro starts at $15/host/month plus custom metric charges. GetPageSpeed Amplify Starter is $9 total for 5 hosts — roughly 8-10x cheaper at small fleet sizes.

No. All NGINX, system, Varnish, and PHP-FPM metrics are included in every plan. Flat per-host pricing only.

Datadog NGINX Alternative
Without the per-metric surprise bill.

Flat $9/month for 5 hosts. Every NGINX, Varnish, PHP-FPM and MySQL metric included. No custom-metric fees, no dashboard-per-user charges.

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Datadog vs. GetPageSpeed Amplify for NGINX

Cost dimension	Datadog Pro	GetPageSpeed Amplify Starter
Per-host base	$15/host/mo	$1.80/host/mo (5-host bundle)
Custom metrics	$0.05-$0.10 each	unlimited, included
NGINX Plus metrics	add-on	native
Config analyzer	✗	✓
Website uptime monitoring	separate Synthetics plan	included
Retention	15 months	up to 1 year
5 hosts / month total	~$75+ (before metrics)	$9 flat

Why teams switch from Datadog for web-stack monitoring

Predictable bill

Flat per-host pricing. No metric cardinality bombs at renewal.

Purpose-built for web stacks

Native NGINX, Varnish, PHP-FPM metrics and config analysis, not generic integrations.

5-minute setup

One install script. Existing nginx-amplify-agent users just change api_url.

No vendor lock-in

Agent is open-source. You can leave any time and keep the collector.

Stop paying for NGINX metrics by the metric.