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Azure Functions vs Tailscale

Azure Functions logo

Azure Functions

Cloud

Event-driven serverless compute on Azure

From
Free
Rated
-
Full reviewWebsite
Tailscale logo

Tailscale

Networking

Zero-trust mesh VPN built on WireGuard with identity-based access

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Azure Functions consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that; Tailscale requires active configuration and management; cannot be deployed passively like consumer VPNs

Where they differ

Only the attributes on which Azure Functions and Tailscale actually diverge.

Attributes where Azure Functions and Tailscale differ
AttributeAzure FunctionsTailscale
Pricing modelusage-basedfreemium
PlatformsWebLinux, macOS, Windows, iOS, Android, API, Web
CategoryCloudNetworking

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

What people use each for

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

Azure Functions

  • Event-driven computingnot Tailscale
  • Serverless application backendnot Tailscale
  • Scalable API endpointsnot Tailscale

Tailscale

  • Remote team access to internal services without VPN concentratorsnot Azure Functions
  • Hybrid cloud connectivity across AWS, Azure, GCP, and on-premises networksnot Azure Functions
  • CI/CD pipeline access to internal infrastructure (databases, Kubernetes clusters)not Azure Functions
  • Zero-trust access to SSH, Kubernetes, and databases without bastion hostsnot Azure Functions
  • Mobile and IoT device management in enterprise environmentsnot Azure Functions
  • Temporary contractor and third-party access controlnot Azure Functions

Where each one falls short

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

Azure Functions

  • Consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that
  • The newer Flex Consumption plan's free grant is smaller still, at 250,000 executions and 100,000 GB-seconds per month
  • Premium plan avoids per-execution charges but bills continuously for allocated core seconds and memory regardless of invocation volume
  • Memory is rounded up to the nearest 128 MB and execution time to the nearest 1 ms for billing, so small overages round upward

Tailscale

  • Requires active configuration and management; cannot be deployed passively like consumer VPNs
  • Device posture policies and JIT access tiers are locked behind Premium subscription (£18/month), raising per-user costs for enterprises
  • Limited support for legacy protocols and non-modern operating systems (Windows 7, older Android versions)
  • Centralised control plane operated by Tailscale (hosted in US); no self-hosted control plane option for air-gapped or sovereign deployments
  • Cannot replace full VPN functionality for accessing legacy IP-based services; only applicable to modern infrastructure

Pricing, plan by plan

Azure Functions

Free
  • Consumption Plan$null/month
    • 1 million requests free monthly
    • 400,000 GB-seconds free monthly
    • Billed per second and executions
  • Flex Consumption Plan$null/month
    • 250,000 executions free monthly
    • 100,000 GB-seconds free monthly
    • Event-driven scaling
  • Premium Plan$null/month
    • No execution charges
    • At least one instance required
    • Includes automatic scaling and VNET access

Tailscale

Free
  • PersonalFree
    • Up to 6 users
    • Unlimited devices per user
    • 1,000 ephemeral resource minutes per month
  • Standard$8/month
    • Unlimited users
    • Unlimited devices
    • 1,000 ephemeral resource minutes per month
  • Premium$18/month
    • Unlimited users and devices
    • 10,000 ephemeral resource minutes per month
    • 300 ACL groups
  • EnterpriseFree
    • Custom pricing
    • Unlimited resources
    • Advanced security features

Which should you pick?

Choose Azure Functions if

  • You want to start without paying.
Azure Functions review

Choose Tailscale if

  • You want to start without paying.
  • You work on Linux, macOS, Windows, iOS, Android, API, Web.
Tailscale review

Questions people ask

Is Azure Functions or Tailscale better?
Neither clearly leads. Azure Functions starts at Free and Tailscale at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Functions or Tailscale?
Azure Functions starts at Free and Tailscale at Free.
Does Azure Functions or Tailscale run on more platforms?
Azure Functions runs on Web. Tailscale runs on Linux, macOS, Windows, iOS, Android, API, Web.
Can I use Azure Functions for free?
Both have a free tier, so you can try either at no cost before committing.
What is Azure Functions best used for?
Azure Functions is most often used for event-driven computing, serverless application backend, scalable api endpoints. Of those, event-driven computing and serverless application backend are not what Tailscale is typically brought in for.

Answered from the vendors’ own pages

Azure Functions: Does Azure Functions have a free tier?

Yes, Azure Functions includes a monthly free grant of 1 million requests and 400,000 GB-seconds on the Consumption Plan, or 250,000 executions and 100,000 GB-seconds on Flex Consumption.

Source
Tailscale: Is Tailscale free?

Tailscale Personal tier is free forever for up to 6 users. Standard (£8/month per user) adds team features, Premium (£18/month per user) adds security controls, and Enterprise tiers are custom priced.

Source
Azure Functions: What is Azure Functions' pricing model?

Azure Functions uses usage-based pricing. Consumption plans charge per second of resource consumption and per execution, measured in gigabyte-seconds and rounded to the nearest 128 MB.

Source
Tailscale: Does Tailscale route all traffic through a central gateway?

No. Tailscale creates direct encrypted connections between devices using WireGuard. It only proxies traffic when direct peer connections are not possible (some restrictive NAT scenarios). This reduces latency and eliminates VPN gateway bottlenecks.

Source
Azure Functions: What is the minimum execution time for Azure Functions?

The minimum execution time is 100 milliseconds on Consumption plans. Premium plans charge based on core seconds and allocated memory.

Source
Tailscale: Can I host Tailscale on-premises?

No. Tailscale provides a hosted control plane only. For fully self-hosted mesh networking, consider WireGuard with manual key management or Netmaker. Tailscale Enterprise can provide custom deployments for specific requirements.

Source
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