Compare providers·Tools

AWS (serverless) vs Fly.io

Monthly hosting costs for typical app profiles — computed with the same recommendation engine as StackPlan stack reports. Assumes balanced budget and ops preferences unless noted.

Pricing data:AWS (serverless) · updated Jun 2025Fly.io · updated Jun 2025

Web app

MetricAWS (serverless)Fly.io
Cost at 1k DAU$25.44/mo$32.10/mo
Cost at 100 DAU$12.68/mo$5.95/mo
Cost at 1K DAU$25.44/mo$32.10/mo
Cost at 10K DAU$165.84/mo$190.95/mo
Cost at 100K DAU$1571.52/mo$1782.20/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
Fit score90/10078/100
Verdict: Costs trade off by traffic level — compare the table above for your expected scale.

SaaS product

MetricAWS (serverless)Fly.io
Cost at 1k DAU$25.84/mo$32.50/mo
Cost at 100 DAU$12.68/mo$5.95/mo
Cost at 1K DAU$25.84/mo$32.50/mo
Cost at 10K DAU$171.44/mo$196.55/mo
Cost at 100K DAU$1631.12/mo$1841.80/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • Cloudflare · Queues · Paid
  • AWS (serverless) · EventBridge Scheduler · Free
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
  • Cloudflare · Queues · Paid
  • AWS (serverless) · EventBridge Scheduler · Free
Fit score70/10057/100
Verdict: Costs trade off by traffic level — compare the table above for your expected scale.

E-commerce store

MetricAWS (serverless)Fly.io
Cost at 1k DAU$40.90/mo$37.06/mo
Cost at 100 DAU$14.23/mo$6.45/mo
Cost at 1K DAU$40.90/mo$37.06/mo
Cost at 10K DAU$320.38/mo$240.49/mo
Cost at 100K DAU$3116.84/mo$2277.52/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • AWS (serverless) · S3 · Standard
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
  • Fly.io · Tigris · Standard
Fit score82/10086/100
Verdict: Fly.io is cheaper for this profile at every traffic level.

API / backend service

MetricAWS (serverless)Fly.io
Cost at 1k DAU$25.44/mo$32.10/mo
Cost at 100 DAU$12.68/mo$5.95/mo
Cost at 1K DAU$25.44/mo$32.10/mo
Cost at 10K DAU$165.84/mo$190.95/mo
Cost at 100K DAU$1571.52/mo$1782.20/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
Fit score100/10088/100
Verdict: Costs trade off by traffic level — compare the table above for your expected scale.

Mobile app backend

MetricAWS (serverless)Fly.io
Cost at 1k DAU$40.90/mo$37.06/mo
Cost at 100 DAU$14.23/mo$6.45/mo
Cost at 1K DAU$40.90/mo$37.06/mo
Cost at 10K DAU$320.38/mo$240.49/mo
Cost at 100K DAU$3116.84/mo$2277.52/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • AWS (serverless) · S3 · Standard
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
  • Fly.io · Tigris · Standard
Fit score92/10096/100
Verdict: Fly.io is cheaper for this profile at every traffic level.

Realtime / collaborative

MetricAWS (serverless)Fly.io
Cost at 1k DAUNot a fit for this app type$32.10/mo
Cost at 100 DAUNot a fit for this app type$5.95/mo
Cost at 1K DAUNot a fit for this app type$32.10/mo
Cost at 10K DAUNot a fit for this app type$190.95/mo
Cost at 100K DAUNot a fit for this app type$1782.20/mo
Services usedNot a fit for this app type
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
Fit score—87/100
Verdict: Fly.io is the only viable option for this app type.

Jobs & pipelines

MetricAWS (serverless)Fly.io
Cost at 1k DAU$25.84/mo$32.50/mo
Cost at 100 DAU$12.68/mo$5.95/mo
Cost at 1K DAU$25.84/mo$32.50/mo
Cost at 10K DAU$171.44/mo$196.55/mo
Cost at 100K DAU$1631.12/mo$1841.80/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • Cloudflare · Queues · Paid
  • AWS (serverless) · EventBridge Scheduler · Free
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
  • Cloudflare · Queues · Paid
  • AWS (serverless) · EventBridge Scheduler · Free
Fit score80/10067/100
Verdict: Costs trade off by traffic level — compare the table above for your expected scale.

AI app

MetricAWS (serverless)Fly.io
Cost at 1k DAU$40.90/mo$37.06/mo
Cost at 100 DAU$14.23/mo$6.45/mo
Cost at 1K DAU$40.90/mo$37.06/mo
Cost at 10K DAU$320.38/mo$240.49/mo
Cost at 100K DAU$3116.84/mo$2277.52/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • AWS (serverless) · S3 · Standard
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
  • Fly.io · Tigris · Standard
Fit score92/10086/100
Verdict: Fly.io is cheaper for this profile at every traffic level.

Internal tool

MetricAWS (serverless)Fly.io
Cost at 1k DAU$25.44/mo$32.10/mo
Cost at 100 DAU$12.68/mo$5.95/mo
Cost at 1K DAU$25.44/mo$32.10/mo
Cost at 10K DAU$165.84/mo$190.95/mo
Cost at 100K DAU$1571.52/mo$1782.20/mo
Services used
  • AWS (serverless) · Lambda + API Gateway · Pay as you go
  • AWS (serverless) · RDS Postgres · db.t4g.micro
  • Fly.io · Machines · Shared CPU 1x
  • Fly.io · Postgres · Standard
Fit score90/10078/100
Verdict: Costs trade off by traffic level — compare the table above for your expected scale.

These numbers assume a typical profile

Get numbers for YOUR app — traffic, storage, database, jobs, and budget — in about two minutes.

Get numbers for your app