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Cloud · head to head

Cilium vs Upstash

Cilium logo

Cilium

Cloud

eBPF-based networking, observability and security for Kubernetes

From
Free
Rated
-
Full reviewWebsite
Upstash logo

Upstash

Cloud

Serverless data for modern developers

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Cilium requires a recent Linux kernel, which rules out older distributions and some managed environments; Upstash hTTP-based REST API only, no TCP connections means higher latency than self-hosted or connection-pooled Redis
  • They diverge on capability: Cilium covers eBPF datapath, Upstash covers Serverless Redis.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Cilium and Upstash actually diverge.

Attributes where Cilium and Upstash differ
AttributeCiliumUpstash
Pricing modelOpen source, no licence feeUnknown
PlatformsKubernetes, LinuxREST API, Node.js, Python, Go, Rust, Vercel Edge, Cloudflare Workers, AWS Lambda
FoundedUnknown2020

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

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 Cilium

  • eBPF datapath
  • Identity-based policy
  • Hubble observability
  • Sidecar-free mesh

Only in Upstash

  • Serverless Redis
  • Serverless Kafka
  • QStash
  • Global Replication
  • REST API
  • Edge Functions Support
  • Rate Limiting
  • Caching

What people use each for

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

Cilium

  • Kubernetes networking at a scale where iptables-based CNI performance degradesnot Upstash
  • Network policy expressed on workload identity rather than fragile IP rulesnot Upstash
  • Seeing which services actually talk to each other, and what policy is droppingnot Upstash

Upstash

  • Cachingnot Cilium
  • Session storagenot Cilium
  • Real-time messagingnot Cilium
  • Rate limitingnot Cilium
  • Serverless backendsnot Cilium

Where each one falls short

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

Cilium

  • Requires a recent Linux kernel, which rules out older distributions and some managed environments
  • eBPF is genuinely hard to debug when it misbehaves, and the skill is rare on most teams
  • Broad scope — CNI, policy, mesh, observability — means the learning curve covers several domains at once

Upstash

  • HTTP-based REST API only, no TCP connections means higher latency than self-hosted or connection-pooled Redis
  • Rate limiting occurs when traffic exceeds configured budget cap or request limits
  • Kafka service discontinued in March 2025, requiring migration to Upstash Workflow or alternatives
  • Limited Redis feature support compared to self-hosted Redis or Redis Cloud
  • High-request-volume workloads can accumulate significant costs due to per-request pricing model

Pricing, plan by plan

Cilium

Free
  • CiliumFree
    • Full functionality
    • No usage limits
    • Community support

Upstash

Free
  • FreeFree
    • 256 MB data
    • 500K commands per month
    • 10 GB bandwidth
  • Pay-as-you-go$0.2/per 100K commands
    • Per-request billing
    • Storage at $0.25/GB
    • Unlimited commands
  • Fixed Plan$10/month
    • 250 MB Redis
    • Predictable pricing
    • Global replication available at higher tiers

Which should you pick?

Choose Cilium if

  • You need ebpf datapath.
  • You want to start without paying.
  • You work on Kubernetes, Linux.
  • You also want identity-based policy.
Cilium review

Choose Upstash if

  • You need serverless redis.
  • You want to start without paying.
  • You work on REST API, Node.js, Python, Go, Rust, Vercel Edge, Cloudflare Workers, AWS Lambda.
  • You also want serverless kafka.
Upstash review

Questions people ask

Is Cilium or Upstash better?
Neither clearly leads. Cilium starts at Free and Upstash at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cilium or Upstash?
Cilium starts at Free and Upstash at Free.
Does Cilium or Upstash run on more platforms?
Cilium runs on Kubernetes, Linux. Upstash runs on REST API, Node.js, Python, Go, Rust, Vercel Edge, Cloudflare Workers, AWS Lambda.
Can I use Cilium for free?
Both have a free tier, so you can try either at no cost before committing.
What is Cilium best used for?
Cilium is most often used for kubernetes networking at a scale where iptables-based cni performance degrades, network policy expressed on workload identity rather than fragile ip rules, seeing which services actually talk to each other, and what policy is dropping. Of those, kubernetes networking at a scale where iptables-based cni performance degrades and network policy expressed on workload identity rather than fragile ip rules are not what Upstash is typically brought in for.
What can Cilium do that Upstash cannot?
Cilium covers eBPF datapath, Identity-based policy, Hubble observability, Sidecar-free mesh. Upstash covers Serverless Redis, Serverless Kafka, QStash, Global Replication.

Answered from the vendors’ own pages

Cilium: Is Cilium free?

Yes, open source and CNCF-graduated. Isovalent sells an enterprise distribution and support.

Upstash: Does Upstash have a free tier?

Yes. The free tier provides 256 MB of data and 500,000 commands per month with 10 GB of bandwidth in a single region, no credit card required.

Source
Cilium: What does eBPF change?

It lets Cilium run packet-processing programs inside the kernel instead of relying on iptables rule chains, which behave poorly as the number of services grows.

Upstash: How does Upstash work with edge platforms like Vercel and Cloudflare Workers?

Upstash uses a REST API instead of TCP connections, enabling it to work from Vercel Edge, Cloudflare Workers, and AWS Lambda without persistent connections or connection pooling.

Source
Cilium: Does Cilium replace a service mesh?

It can cover much of what a mesh does without sidecars, though full mesh feature sets still favour Istio or Linkerd.

Upstash: What programming languages are supported?

Upstash provides native SDKs for Python, Node.js, Go, and Rust. Java, C#, and PHP developers can use the REST API or community libraries.

Source
Upstash: Is Upstash Kafka still available?

No. Upstash Kafka was deprecated on September 11, 2024 and fully discontinued on March 11, 2025. Upstash Workflow is now recommended for durable serverless messaging and task queuing.

Source
Upstash: How is Upstash pricing structured?

Upstash uses per-request pricing at $0.20 per 100K commands for Redis, $0.25/GB for storage, and $0.40 per 100K requests for Vector database. Idle applications cost nothing.

Source
Upstash: Can Upstash be used with AWS Lambda?

Yes. Upstash works with AWS Lambda via its REST API, eliminating the need for connection pooling and making it ideal for stateless serverless functions.

Source
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