Quick Answer
Last verified:
High confidence

Prometheus costs Free to Free per month as of November 2026 including a free tier. Plan: Open source (self-hosted) (free). Pricing depends on your chosen tier, contract length, and negotiated discounts.

Use the interactive pricing calculator to estimate your exact cost based on team size and requirements.

  • Free tier: Yes

Prometheus offers 1 pricing tiers: Open source (self-hosted). The Open source (self-hosted) plan is teams that run their own monitoring.

Last verified: | Sources: 5 pricing pages and reviews
Know Before You Buy — Try Prometheus Free

Prometheus is free, but hidden costs like implementation and support still add to the total as of November 2026. Key hidden costs: engineering operational overhead (self-hosted), managed service cost shock from scrape interval misconfiguration, managed prometheus expensive at scale. Verified from 5 sources by CostBench.

Hidden Costs Breakdown

1

Engineering Operational Overhead (Self-Hosted)

high support

Self-hosting Prometheus requires significant ongoing engineer time for setup, alert rule configuration, scaling, and maintenance. Community consensus is that even a quarter-time junior engineer to maintain the stack costs far more than the raw infrastructure savings over managed alternatives.

reddit · 2025-03-19

How much would it cost you to host and manage prometheus yourself? A hell of a lot more than $500 a month. Do you know any engineers willing to run critical production services for a $6,000 a year salary? Or actually more like a $3,000 a year salary, after you figure in the infrastructure cost? If you're using a single cheap junior dev at quarter time to maintain that system, that's $20,000 a year

reddit · 2020-07-20

Open source observability tools like Prometheus and Grafana need a lot of developer effort to set up and make them work perfectly. In large organizations where there is no dearth of resources, putting together a team of engineers and get them set these up is very easy.

2

Managed Service Cost Shock from Scrape Interval Misconfiguration

critical overage

AWS Managed Service for Prometheus and Grafana Cloud bill by active time series multiplied by data points per minute. Setting scrape intervals too aggressively (15 seconds instead of 60-75 seconds) can multiply costs by 4-5x, pushing managed Prometheus costs as high as Datadog.

reddit · 2024-11-14

I didn't realize that by setting the interval of how often it sends metrics to 15 seconds across 100 servers that I would in fact not be saving the company any money, but infact costing them about as much as data dog lol. Queue to a tense conversation when the pricing alerts went off, followed by 6 hours of not leaving my chair and frantically working with aws support to understand how pricing works. Updated the metrics push interval to 75 seconds and all was well again.

reddit · 2024-10-02

Grafana metric pricing is based on `number of active timeseries * DPM (data point per metric per minute)`. As an example, if your Prometheus scrape interval is 30s, then each metric will generate 2 data points per minute, so your bill would be double in comparison to when the scrape interval is 60s. Grafana's pricing of 8$ per thousand timeseries is also pretty high.

3

Managed Prometheus Expensive at Scale

high overage

Both AWS and GCP managed Prometheus offerings become significantly more expensive than self-hosting as metric cardinality and series count grow. Users report managed costs of $1,500/month or more for workloads that run for $150/month self-hosted.

reddit · 2025-03-17

GCP Prometheus managed service is stupid expensive.

reddit · 2023-11-07

AWS Managed Prometheus could be an option. However, watch pricing carefully as this can get expensive if you start tracking too many metrics series.

4

Horizontal Scaling Requires Additional Infrastructure

medium integration

Prometheus is not horizontally scalable by default. Teams needing high availability or large-scale deployments must add Thanos, Cortex, or switch to VictoriaMetrics, adding infrastructure cost and operational complexity on top of the base Prometheus stack.

reddit · 2024-08-15

Prom is not horizontally scalable, so you would need to use a third component for scaling (like Thanos, Cortex) if you want to scale further.

5

Infrastructure & Server Costs for Self-Hosting

medium implementation

Running Prometheus self-hosted requires dedicated server infrastructure. While the software is free, teams must pay for compute, storage, and networking. A t3.xlarge instance alone costs ~$150/month, and managing high cardinality metrics can require significantly more compute.

hn · 2021-09-30

We have a small Prometheus running on t3.xlarge instance. Yes we don't have a redundancy or anything fancy, but it's fine, we can live without it. It does 105k samples scrapes every 10 seconds. If I plug these numbers in I get... $1.5k a month before storage and query costs. That instance costs us $150 a month?

6

High Cardinality Scalability Costs (Thanos/Cortex/VictoriaMetrics)

high integration

Prometheus is not horizontally scalable out of the box. High cardinality metrics cause memory exhaustion on a single instance. Teams need to add Thanos, Cortex, or VictoriaMetrics for HA and long-term storage, adding significant infrastructure and operational complexity.

hn · 2021-10-18

I'm really struggling to understand the marketing from Honeycomb. They have a lot of reputable and smart staff, seemingly making conflicting public statements. For example, in this post, the author describes how expensive cardinality is for TSDB...

hn · 2026-02-20

The open source stack has gotten genuinely viable: Prometheus/VictoriaMetrics for metrics, Grafana for viz, and OpenTelemetry as the collection layer means you're not locked into anyone's agent.

7

Grafana or Dashboarding Tool Required

medium addon

Prometheus has no built-in dashboarding. Nearly all production deployments require Grafana or an equivalent tool for visualization, adding setup complexity and potentially licensing costs for enterprise Grafana features.

hn · 2025-06-25

Prometheus/node exporter for metrics, grafana for panels.

reddit · 2026-03-16

Pretty much everyone had stitched together Prometheus, Grafana, Kubernetes scheduling policies, and a bunch of homegrown scripts, and they were spending as much time maintaining all of it as actually using it.

8

Migration Cost from Managed Observability Platforms

medium migration

Teams migrating from platforms like Datadog to self-hosted Prometheus face significant non-technical migration costs: retraining on-call teams, rebuilding runbooks, alert routing, and organizational muscle memory — not just technical backend swaps.

hn · 2026-02-20

The actual hard part of leaving DD isn't technical, it's organizational. DD becomes load-bearing for on-call runbooks, alert routing, and team muscle memory. Migration is less 'swap the backend' and more 'retrain your incident response.'

reddit · 2024-05-03

We are now slowly moving from datadog to self-hosted prometheus and loki.

Frequently Asked Questions

01 What hidden costs should I budget for with Prometheus?

Beyond the license fee, budget for: Engineering Operational Overhead (Self-Hosted) ($20,000-$60,000/year in engineering time (source dated Mar 2025)); Managed Service Cost Shock from Scrape Interval Misconfiguration (4-5x cost increase vs expected); Managed Prometheus Expensive at Scale (5-10x cost vs self-hosted at scale); Horizontal Scaling Requires Additional Infrastructure (10-30% of license costs); Infrastructure & Server Costs for Self-Hosting ($150-$500/month); High Cardinality Scalability Costs (Thanos/Cortex/VictoriaMetrics) (5-20% of license costs); Grafana or Dashboarding Tool Required ($19-$80/month); Migration Cost from Managed Observability Platforms (5-15% of license costs). Exact totals depend on your deployment size and negotiated terms.

02 Does Prometheus charge for implementation?

Prometheus implementation is not included in the license cost. Running Prometheus self-hosted requires dedicated server infrastructure. While the software is free, teams must pay for compute, storage, and networking. Estimated impact: $150-$500/month.

03 How much does Prometheus support cost?

Self-hosting Prometheus requires significant ongoing engineer time for setup, alert rule configuration, scaling, and maintenance. Community consensus is that even a quarter-time junior engineer to maintain the stack costs far more than the raw infrastructure savings over managed alternatives. Estimated impact: $20,000-$60,000/year in engineering time (source dated Mar 2025).

04 Are there overage or storage costs with Prometheus?

AWS Managed Service for Prometheus and Grafana Cloud bill by active time series multiplied by data points per minute. Setting scrape intervals too aggressively (15 seconds instead of 60-75 seconds) can multiply costs by 4-5x, pushing managed Prometheus costs as high as Datadog. Estimated impact: 4-5x cost increase vs expected.

05 What add-ons cost extra with Prometheus?

Add-on pricing for Prometheus varies by feature. The sourced cost breakdown above lists any verified add-on costs we have.

Now You Know the Real Cost — Try Prometheus Free

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