Side by side

SpeedFan vs Telegraf

Both stand on hardware monitoring software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

SpeedFan

Free plan Windows

SpeedFan combines hardware monitoring, disk-health readings, and conditional fan control at no cost. Its power-user focus and hardware compatibility requirements make careful configuration important.

Visit SpeedFan

Choose the free open source edition for personal, small, or simple metric pipelines across infrastructure, applications, and devices. Consider Enterprise if you need centralized management, fleet visibility, access controls, or Enterprise Support; its plans start at $18,000 / year.

Visit Telegraf

The facts

	SpeedFan	Telegraf
Free plan	Yes	Yes
Open source	Not published	Yes
Runs on	Windows	API, Linux, Mac, Self-hosted, Web, Windows
Lowest paid plan	Free or on request	Telegraf Enterprise: $18,000 a year
Plans published	1	3
Maker	SpeedFan	Not published
Website	almico.com	influxdata.com
On hardware monitoring software	#50 of 59	#4 of 59

SpeedFan: what it does well

Free Windows software
Monitors voltages, fans, and temperatures
Reads S.M.A.R.T. disk information
Online analysis uses millions of reports
Supports custom events

What to know first

Fan control needs compatible motherboard circuitry
Latest listed version is 4.52
Maker cautions against unattended configurations
Hardware access may not suit every system

Telegraf: what it does well

Open source edition is free.
400+ community-tested plugins connect data sources and destinations.
Collects real-time IoT and edge signals via MQTT, Modbus, and OPC-UA.
Can monitor Kubernetes, Docker, and Prometheus.
Enterprise adds fleet visibility and role-based access control.

What to know first

Open source Telegraf has no native access control.
Enterprise starts at $18,000 / year.
Free Controller is limited to 20 configurations and 100 reporting agents.

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