What is the difference between Fly.io and Supabase?

Fly.io is best for Developers wanting to run apps close to users globally, while Supabase is best for Full-stack developers wanting a hosted Postgres backend. Fly.io starts at Free and Supabase starts at Free.

Is Fly.io or Supabase cheaper?

Fly.io starts at Free with a free tier. Supabase starts at Free with a free tier.

Is there a free alternative to Supabase?

Both Fly.io and Supabase offer free tiers.

Fly.io vs Supabase

Fly.io is platform for running full-stack apps and databases close to users with automatic scaling, while Supabase is Open-source Firebase alternative with Postgres database, auth, and edge functions. Supabase is open source and can be self-hosted, giving you full control over your data. Fly.io is built for developers wanting to run apps close to users globally, whereas Supabase targets full-stack developers wanting a hosted postgres backend.

At a glance

	Fly.io	Supabase
Best for	Developers wanting to run apps close to users globally	Full-stack developers wanting a hosted Postgres backend
Starting price	Free	Free
Free tier	✓	✓
Open source	—	✓
Free tier available	✓	✓
Open source	—	✓
Auth	—	✓
Edge Computing	✓	—
Edge Functions	—	✓
GPU Support	✓	—
Global Deploy	✓	—
Machines API	✓	—
Postgres	—	✓
Real-Time	—	✓

Fly.io

Strengths

Includes Edge Computing as a core feature, purpose-built for cloud hosting workflows
Includes Global Deploy as a core feature, purpose-built for cloud hosting workflows
Generous free tier — generous enough for most small teams to get real work done
Includes gpu support alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Developer-oriented tooling may not suit non-technical team members
Costs can spike unexpectedly during traffic surges if limits aren't configured
Limited team/admin features if your organization eventually scales up

Try Fly.io → Full review

Supabase

Strengths

Open source and transparent
Includes Postgres as a core feature, purpose-built for cloud hosting workflows
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
Free for 2 projects — generous enough for most small teams to get real work done

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Costs can spike unexpectedly during traffic surges if limits aren't configured
Community support can be slower than the dedicated support teams at commercial alternatives

Try Supabase → Full review

The bottom line

Pricing: Both tools offer free tiers, so you can test each before committing. Fly.io's free plan: Generous free tier. Supabase's free plan: Free for 2 projects.

Feature gaps: Fly.io offers Edge Computing, GPU Support and Global Deploy that Supabase lacks. Supabase brings Auth, Edge Functions and Postgres that Fly.io does not have.

Team fit: Both tools target small teams teams, so the decision hinges on features and workflow fit rather than scale.

Open source: Supabase is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Fly.io is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Fly.io's biggest strengths are: includes edge computing as a core feature, purpose-built for cloud hosting workflows. includes global deploy as a core feature, purpose-built for cloud hosting workflows. Supabase's biggest strengths are: open source and transparent. includes postgres as a core feature, purpose-built for cloud hosting workflows.

Watch out for: With Fly.io, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Supabase, the main complaint is that free plan exists but key features are locked behind the paid upgrade.

Choose Fly.io if...

Your profile matches its sweet spot: developers wanting to run apps close to users globally
You specifically need Edge Computing and GPU Support
You care about includes global deploy as a core feature, purpose-built for cloud hosting workflows
The free tier works for you: generous free tier

Choose Supabase if...

You need a tool built for full-stack developers wanting a hosted postgres backend
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Auth and Edge Functions
You care about includes postgres as a core feature, purpose-built for cloud hosting workflows
The free tier works for you: free for 2 projects