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

Fly.io starts at $29/mo, while Customer.io starts at an unpublished tier.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

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

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

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

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

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

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

Fly.io vs Customer.io

A side-by-side comparison of pricing, plans, and recent product updates. Pricing data last refreshed May 14, 2026.

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 →

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 →

Plan-by-plan pricing

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

Customer.io

Pricing data is being collected.