PM2 vs Site Spy

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

PM2

See full pricing history

USD · US · source: pm2.keymetrics.io

Plan	Pricing	Charged by	Offer type
OpenSource	Free OpenSource	Flat · published offer	Standalone · Free
Plus	USD 39 monthly Starts at $39/month	Flat · /mo	Standalone · Starting at
Enterprise Runtime	USD 79 monthly Starts at $79/month	Flat · /mo	Standalone · Starting at

Site Spy

See full pricing history

EUR · US · source: sitespy.app

Plan	Pricing	Charged by	Offer type
Free	Free €0 forever	Flat	Standalone · Free
Starter	EUR 4 monthly €4 / month	Flat	Standalone · Fixed
Pro Highlighted	EUR 8 monthly €8 / month	Flat	Standalone · Fixed
Business	EUR 99 monthly €99 / month	Flat	Standalone · Fixed

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

PM2

OpenSource

Plan card PM2 Process Manager: Included
Plan card Zero Downtime Reloads: Included
Plan card Terminal Based Monitoring: Included

Plus

Plan card Node.js production monitoring: Included
Plan card Real-time web monitoring: Included
Plan card Email and Slack notifications: Included

Enterprise Runtime

Plan card Synthetic application overview: Included
Plan card Custom metrics: Included
Plan card Server health check monitoring: Included

Site Spy

Free

Highlights Pages you can watch: 2

Included
Highlights Fastest checks: Every hour

Included
Highlights History kept: 30 days

Included
Highlights Snapshots per page: 8

Included
Highlights Manual rechecks a day: 3

Included
Highlights API requests a day: 100

Included
Highlights Email, Telegram and push alerts: Included
Highlights 90+ webhook integrations: Included
Highlights Browser extension, MCP and RSS: Included
Highlights Bulk import: Excluded
Highlights AI change summaries: Excluded
Highlights Screenshots and visual diffs: Excluded
Highlights Team seats: Excluded

Starter

Highlights Pages you can watch: 25

Included
Highlights Fastest checks: Every 10 min

Included
Highlights History kept: 90 days

Included
Highlights Snapshots per page: 25

Included
Highlights Manual rechecks a day: 10

Included
Highlights API requests a day: 1,000

Included
Highlights Email, Telegram and push alerts: Included
Highlights 90+ webhook integrations: Included
Highlights Browser extension, MCP and RSS: Included
Highlights Bulk import: Included
Highlights AI change summaries: Excluded
Highlights Screenshots and visual diffs: Excluded
Highlights Team seats: Excluded

Pro

Highlights Pages you can watch: 100

Included
Highlights Fastest checks: Every minute, 10 pages

Limited
Highlights History kept: 1 year

Included
Highlights Snapshots per page: 100

Included
Highlights Manual rechecks a day: 25

Included
Highlights API requests a day: 10,000

Included
Highlights Email, Telegram and push alerts: Included
Highlights 90+ webhook integrations: Included
Highlights Browser extension, MCP and RSS: Included
Highlights Bulk import: Included
Highlights AI change summaries: Included
Highlights Screenshots and visual diffs: Included
Highlights Team seats: Excluded

Business

Highlights Pages you can watch: 500

Included
Highlights Fastest checks: Every minute

Included
Highlights History kept: 1 year

Included
Highlights Snapshots per page: 500

Included
Highlights Manual rechecks a day: 100

Included
Highlights API requests a day: 50,000

Included
Highlights Email, Telegram and push alerts: Included
Highlights 90+ webhook integrations: Included
Highlights Browser extension, MCP and RSS: Included
Highlights Bulk import: Included
Highlights AI change summaries: Included
Highlights Screenshots and visual diffs: Included
Highlights Team seats: 5

Included

How their prices changed

Each date shows when a public price was observed, not when it took effect. An archived region or currency can differ, so a currency change is not necessarily a price increase.

PM2

August 27, 2026
Official pricing page
- OpenSource: Free
- Plus: USD 39 monthly
- Enterprise Runtime: USD 79 monthly

Site Spy

September 21, 2026
Official pricing page
- Free: Free
- Starter: EUR 4 monthly
- Pro: EUR 8 monthly
- Business: EUR 99 monthly
August 27, 2026
Official pricing page
- Free forever — free: Free
- Stay Informed — standard: EUR 4 monthly · EUR 4 / month with annual commitment
- Starter plan — standard: EUR 8 monthly · EUR 8 / month with annual commitment
- Pro plan — standard: EUR 99 monthly · EUR 99 / month with annual commitment