Customer.io vs Fly.io: which is cheaper?

Customer.io starts at an unpublished tier, while Fly.io starts at $29/mo. TrackRival snapshots both daily as plan pages change.

Does Customer.io or Fly.io have a free plan?

Neither Customer.io nor Fly.io shows a free plan in the latest snapshot.

Is Customer.io a good email alternative to Fly.io?

Customer.io is tracked in email, while Fly.io overlaps for similar buyers. Use the changelog section below to compare shipping cadence before you choose.

How often is this Customer.io vs Fly.io comparison updated?

TrackRival refreshes pricing snapshots daily and appends new changelog entries whenever either product ships a release.

Customer.io vs Fly.io

A side-by-side comparison of pricing, plans, and recent product updates. Pricing data syncs daily once the product launches.

Customer.io

Messaging automation for lifecycle and product email.

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Category: email
Plans tracked: —
Entry price: —
Free plan?: —

See full Customer.io pricing & changelog →

Fly.io

Run user code close to users.

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Category: hosting
Plans tracked: 4
Entry price: $29/mo
Free plan?: No

See full Fly.io pricing & changelog →

Plan-by-plan pricing

Customer.io

Pricing data is being collected.

Fly.io

Serious Support

Fly.io

$29/mo

Dedicated team of engineers
Starting price

Compliance Made Easy

Fly.io

$99/mo

HIPAA-compliant workloads
BAAs
SOC2s

Pay-as-You-Go Infrastructure

Fly.io

Micro VMs
Persistent storage
Usage-based billing

Enterprise-Ready

Fly.io

Custom

Larger workloads
Custom resource configurations
SLA requirements
Emergency support