TL;DR
- ▸NTP delivers low-millisecond accuracy across well-managed networks. PTP delivers sub-microsecond accuracy on hardware-aware networks.
- ▸If your application's failure mode involves something breaking at the millisecond level, you need PTP. If it doesn't, NTP is fine.
- ▸The longer field guide covers cost, complexity, deployment patterns and use cases — see the related link.
The short version
NTP delivers low-millisecond accuracy across well-managed networks using software timestamping. It's free, ubiquitous and works on any modern operating system without dedicated hardware. Right answer for almost every general-purpose computer system.
PTP delivers sub-microsecond accuracy on hardware-aware networks using hardware timestamping at the physical layer. It requires dedicated hardware (grandmaster, boundary clocks, hardware-timestamping NICs), is operationally heavier than NTP, and is the standard for finance, broadcast, 5G fronthaul and any application where milliseconds aren't enough.
How to choose in one question
Ask whether you can name a specific downstream system, regulator or measurement that would produce a worse outcome if your timestamps were a millisecond out instead of 100 microseconds. If yes, you need PTP. If no, NTP is fine and PTP is wasted effort. The most common reasons to cross the line are regulated financial timestamping, broadcast IP video, 5G fronthaul, AI training collective communication, distributed database consistency and audit trails for regulated activities.
We have a longer field guide on this — see the related "Precision Time Protocol vs NTP: When Each Belongs in Production" article for the full breakdown of cost, complexity, deployment patterns and the use cases where each protocol is correct.
Frequently asked questions
Which is more accurate, NTP or PTP?+
Should I always use PTP if I can afford it?+
Related reading
Blog · Protocols
Precision Time Protocol vs NTP: When Each Belongs in Production
The honest engineering comparison between Precision Time Protocol and NTP — what each protocol can actually deliver, where the boundary lives, and how to choose between them without falling for either side's marketing.
Blog · Standards
Understanding IEEE 1588 PTP: How Precision Time Powers Industrial Ethernet
What IEEE 1588 actually defines, how the protocol works at the message level, and why it's the foundation under every modern industrial Ethernet, telecom and broadcast timing fabric.
Blog · Protocols
Sync Showdown: NTP vs PTP vs TSN vs EtherCAT
Four protocols, four different precision tiers, four different deployment contexts. A comparative guide to NTP, PTP, TSN and EtherCAT — what each one does, when each one is correct, and how to choose without falling for any side's marketing.