Softwr

Networking · head to head

ngrok vs Prometheus

ngrok logo

ngrok

Networking

Reverse tunnel service that gives a local or private service a public URL without opening a firewall

From
Free
Rated
-
Full reviewWebsite
Prometheus logo

Prometheus

Networking

Open source monitoring and alerting toolkit for cloud native environments

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ngrok free HTTP endpoints show a browser interstitial before the page loads, which breaks first impressions in demos and confuses anyone you send the link to.; Prometheus not suitable for per-request billing as collected data lacks 100% accuracy
  • They diverge on capability: ngrok covers Outbound agent tunnels, Prometheus covers Multi-dimensional Data Model.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which ngrok and Prometheus actually diverge.

Attributes where ngrok and Prometheus differ
AttributengrokPrometheus
Pricing modelPer user per monthopen-source
PlatformsLinux, macOS, Windows, Docker, KubernetesLinux, macOS, Windows
FoundedUnknown2015

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Networking).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in ngrok

  • Outbound agent tunnels
  • Static domains
  • Traffic policy
  • Request inspection
  • Kubernetes ingress
  • TCP and TLS endpoints

Only in Prometheus

  • Multi-dimensional Data Model
  • PromQL Query Language
  • Pull-based Collection
  • Service Discovery
  • Alerting Rules
  • Federation
  • Local Storage
  • Grafana

What people use each for

The jobs each tool is most often brought in to do.

ngrok

  • Receiving webhooks from a payment or messaging provider on a laptop during developmentnot Prometheus
  • Demonstrating a work in progress application to someone outside the network without deploying itnot Prometheus
  • Publishing a service inside a private network or Kubernetes cluster without a public load balancernot Prometheus
  • Giving a partner a temporary authenticated endpoint into an internal APInot Prometheus

Prometheus

  • Monitoring and alerting systemnot ngrok
  • Time-series databasenot ngrok
  • Infrastructure metrics collectionnot ngrok

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

ngrok

  • Free HTTP endpoints show a browser interstitial before the page loads, which breaks first impressions in demos and confuses anyone you send the link to.
  • All traffic passes through ngrok infrastructure, so you inherit its latency and an ngrok incident takes every published endpoint down at once with no local failover.
  • Pricing is per user seat plus allowances, so a platform team publishing many endpoints ends up buying seats for people who never open the dashboard.
  • Bandwidth is metered on paid tiers, so a workload that quietly grows into serving real traffic produces overage rather than a flat bill.
  • Traffic policy configuration is specific to ngrok, so the authentication and routing logic you accumulate at the edge has to be rebuilt if you later move to a conventional ingress.

Prometheus

  • Not suitable for per-request billing as collected data lacks 100% accuracy
  • Hard limit on scrape body size; large responses cause scrape failure
  • Per-scrape sample limit enforced; exceeding limit marks targets as failed
  • Not designed for long-term durable storage; optimised for metrics collection

Pricing, plan by plan

ngrok

Free
  • FreeFree
    • One static domain
    • HTTP endpoints with a browser interstitial
    • Limited simultaneous connections
  • Personal$undefined/month
    • Removes the interstitial warning page
    • Additional reserved domains
    • TCP endpoints
  • Pro$undefined/month
    • Per user billing with team accounts
    • Traffic policy rules and edge authentication
    • Higher bandwidth allowances
  • Enterprise$undefined/year
    • Custom terms and volume pricing
    • Dedicated capacity options
    • Compliance and audit requirements

Prometheus

Free
  • Prometheus (Open Source)Free
    • 100% open source
    • Community-driven project
    • Apache 2 License

Which should you pick?

Choose ngrok if

  • You need outbound agent tunnels.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want static domains.
ngrok review

Choose Prometheus if

  • You need multi-dimensional data model.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want promql query language.
Prometheus review

Questions people ask

Is ngrok or Prometheus better?
Neither clearly leads. ngrok starts at Free and Prometheus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ngrok or Prometheus?
ngrok starts at Free and Prometheus at Free.
Does ngrok or Prometheus run on more platforms?
ngrok runs on Linux, macOS, Windows, Docker, Kubernetes. Prometheus runs on Linux, macOS, Windows.
Can I use ngrok for free?
Both have a free tier, so you can try either at no cost before committing.
What is ngrok best used for?
ngrok is most often used for receiving webhooks from a payment or messaging provider on a laptop during development, demonstrating a work in progress application to someone outside the network without deploying it, publishing a service inside a private network or kubernetes cluster without a public load balancer, giving a partner a temporary authenticated endpoint into an internal api. Of those, receiving webhooks from a payment or messaging provider on a laptop during development and demonstrating a work in progress application to someone outside the network without deploying it are not what Prometheus is typically brought in for.
What can ngrok do that Prometheus cannot?
ngrok covers Outbound agent tunnels, Static domains, Traffic policy, Request inspection. Prometheus covers Multi-dimensional Data Model, PromQL Query Language, Pull-based Collection, Service Discovery.

Answered from the vendors’ own pages

ngrok: Can I use it in production?

It is sold for that now, with static domains, policy rules and a Kubernetes operator. The question is whether you accept a third party on the traffic path for every request.

Prometheus: What does Prometheus cost?

Prometheus is completely free and open source. There are no pricing tiers or paid plans. The entire project is licensed under Apache 2 and hosted on GitHub.

Source
ngrok: Why does my free URL show a warning page?

Free HTTP endpoints carry an interstitial. Removing it requires a paid plan, and it is the most common reason people upgrade.

Prometheus: Is Prometheus commercial software or free?

Prometheus is 100% open source and community-driven. It is a CNCF graduated project with no commercial restrictions or licensing fees.

Source
ngrok: Does it work for SSH or a database?

Yes through TCP endpoints, which are a paid feature.

Prometheus: How is Prometheus licensed?

Prometheus is licensed under the Apache 2 License, which permits free use, modification, and distribution for commercial and non-commercial purposes.

Source
ngrok: What is the self hosted alternative?

A reverse proxy on a server you own with a tunnel back to the service, or one of the self hosted tunnel projects. All of them cost more setup time than the thing they replace.

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