Coolify is a free, open-source, self-hostable PaaS you run on your own servers (VPS, Raspberry Pi, or cloud instance), with an optional $5/month Coolify Cloud…
Best for Coolify: Coolify fits developers who already have (or want) their own servers and want a Heroku/Vercel-style deploy experience without vendor lock-in, using 280+ one-click services and Git integration with GitHub, GitLab, Bitbucket, and Gitea.
Best for Fly.io: Fly.io fits teams that want infrastructure managed for them: VMs, managed Postgres, volumes, global anycast networking, and Kubernetes, deployed close to end users worldwide with usage-based pricing instead of provisioning servers themselves.
At a Glance
Coolify
Fly.io
Primary category
Hosting
Hosting
Rating
Not documented
Not documented
Pricing model
Free/Open Source
Usage-based
Starting price
Free
Pay-as-you-go from about $2 per month per shared-cpu-1x machine; new accounts get a limited free trial (2 VM hours or 7 days, whichever comes first) before a credit card is required
Free plan
Yes
Not documented
Free trial
Not documented
Yes
Platforms
Web
Web
Team collaboration
Not documented
Not documented
AI features
Not documented
Not documented
Public API
Yes
Yes
Key Differences
Deployment Model
Coolify: Coolify deploys onto servers you own (VPS, Raspberry Pi, or cloud instance) — you always bring your own infrastructure, whether self-hosted for free or via the $5/month Coolify Cloud control panel.
Fly.io: Fly.io deploys apps as VMs ("Fly Machines") hosted on Fly.io's own global infrastructure in regions close to end users — no server of your own required.
It determines whether you provision and maintain your own servers or hand infrastructure entirely to the vendor.
Pricing Structure
Coolify: Coolify self-hosting is free forever; Coolify Cloud starts at $5/month for 2 connected servers, with $3/month per additional server.
Fly.io: Fly.io has no published flat starting price — billing is usage-based per organization, e.g. $0.0028-$0.3577/hour per Machine, $0.15/GB/month for volumes, and $0.02-$0.12/GB for data transfer.
Coolify's flat low-cost tier is predictable, while Fly.io's granular usage-based pricing scales with resource use but is harder to estimate upfront.
Managed Data Services
Coolify: Coolify supports one-click deployment of databases among its 280+ services with automatic backups and free Let's Encrypt SSL, but you still run them on your own servers.
Fly.io: Fly.io offers Managed Postgres with automatic backups, Fly Volumes for persistent storage with snapshots, and Fly Kubernetes (FKS) as a managed container orchestration option.
It determines whether database and infrastructure operations are handled by the vendor or remain your responsibility.
Support Options
Coolify: Coolify Cloud's base plan includes only community and limited email support.
Fly.io: Fly.io offers a "Serious Support" plan at $29/month for access to dedicated engineers, and a $99/month HIPAA Compliance Package with BAAs and SOC2 documentation.
Organizations with compliance or SLA requirements need documented, paid support tiers.
Company History
Coolify: Coolify's founding year is not documented in available data.
Fly.io: Fly.io was founded in 2017 and operates as a distributed, remote-first team.
Company longevity can factor into risk assessment for mission-critical infrastructure decisions.
Feature-by-Feature
Deployment & Infrastructure
Feature
Coolify
Fly.io
Self-hosted deployment
Available
Unavailable
Managed VM hosting
Unavailable
Available
One-click service deployment
Available
Not documented
Git provider integration
Available
Not documented
Managed Kubernetes
Not documented
Available
Pricing & Plans
Feature
Coolify
Fly.io
Free self-hosted tier
Available
Unavailable
Entry paid tier
Available
Available
Dedicated support add-on
Unavailable
Available
Data & Storage
Feature
Coolify
Fly.io
Automatic backups
Available
Available
Persistent volumes with snapshots
Not documented
Available
Free SSL certificate management
Available
Not documented
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Fly Kubernetes — $75/month per cluster plus compute and storage monthly
Support plans — $29-$2,500+/month monthly
Pros & Cons
Coolify
Pros
Fully free, open-source self-hosted edition under Apache 2.0 with no feature gating
Simple, Heroku-like developer experience while retaining full control over servers and data
Large marketplace of 280+ one-click service templates reduces manual configuration
Bootstrapped and independent, giving predictable long-term project direction without VC pressure
Cons
Self-hosting requires managing your own server infrastructure and updates
Smaller support organization compared to large commercial cloud platforms
Coolify Cloud requires a separate subscription per additional team
Advanced enterprise features (formal SLAs, dedicated support contracts) are limited given its bootstrapped, community-driven nature
Fly.io
Pros
Genuine multi-region deployment with automatic Anycast routing, rather than a single-region default with manual replication
Fine-grained, container-level control over runtime behavior compared with more abstracted platforms-as-a-service
Fast microVM boot times make it well suited to ephemeral and on-demand workloads such as agent sandboxes
Usage-based pricing means very small or intermittent workloads can run cheaply compared with fixed monthly plans
Cons
The free allowance was removed in October 2024, so new users must attach a credit card almost immediately after a very short trial
Usage-based, per-resource billing across compute, storage, IPs, and bandwidth can make total monthly cost harder to predict than flat-tier competitors
Operating and debugging a distributed, multi-region deployment carries more complexity than single-region platforms like Render
Community reports describe occasional region capacity or networking troubleshooting friction (WireGuard, volume placement) compared with simpler PaaS options
Use Cases
Choose Coolify: Coolify fits developers who already have (or want) their own servers and want a Heroku/Vercel-style deploy experience without vendor lock-in, using 280+ one-click services and Git integration with GitHub, GitLab, Bitbucket, and Gitea.
Choose Fly.io: Fly.io fits teams that want infrastructure managed for them: VMs, managed Postgres, volumes, global anycast networking, and Kubernetes, deployed close to end users worldwide with usage-based pricing instead of provisioning servers themselves.
Need both: A team could self-host internal tooling on Coolify while deploying a latency-sensitive public service on Fly.io's globally distributed Machines, though this is uncommon since both tools solve the same core "deploy my app" problem and most teams standardize on one.
Coolify
Self-hosted app deployment for indie developers — Solo developers and indie hackers use Coolify to deploy side projects and SaaS apps to low-cost VPS providers without paying platform usage fees.
Agency multi-client hosting — Digital agencies use Coolify's unlimited teams and servers to host and manage many client projects from a single self-hosted control plane.
Data-residency and cost-sensitive infrastructure — Organizations with data-residency requirements or cost concerns about hyperscale PaaS pricing self-host Coolify to keep data on their own chosen infrastructure.
Fly.io
Globally distributed APIs and backends — Teams deploy backend services across multiple Fly.io regions so API requests are served from the data center nearest each user, reducing latency for internationally distributed audiences.
Real-time and low-latency applications — Applications such as multiplayer games, chat, and collaborative tools use Fly.io's Anycast routing and WireGuard backhaul to keep round-trip latency low regardless of user location.
AI agent sandboxes and ephemeral compute — The Fly Machines API and fast Firecracker microVM boot times are used to spin up short-lived, isolated Linux environments for AI coding agents and per-user code execution.
Frequently Asked Questions
Does Coolify require me to have my own server, and does Fly.io?
Yes for Coolify — both the self-hosted and Coolify Cloud versions require bringing your own server (VPS, Raspberry Pi, or cloud instance). Fly.io is the opposite: it deploys your app as a VM on Fly's own global infrastructure, so you don't provision servers yourself.
Which is cheaper to start with?
Coolify Cloud starts at a flat $5/month for 2 connected servers ($3/month per additional server), and self-hosting is free forever. Fly.io has no flat starting price; you pay usage-based rates such as $0.0028-$0.3577/hour per Machine plus storage and data transfer fees.
Does either tool offer managed databases?
Fly.io offers Managed Postgres with automatic backups as a built-in product. Coolify lets you one-click deploy databases among its 280+ supported services, but you're responsible for running them on your own server.
Can I get dedicated support with either tool?
Fly.io offers a "Serious Support" plan at $29/month for access to dedicated engineers, plus a $99/month HIPAA Compliance Package. Coolify Cloud's base plan includes only community and limited email support.
When was each company founded?
Fly.io was founded in 2017. Coolify's founding year is not publicly documented in available data.
Is vendor lock-in a concern with either tool?
Coolify is explicitly built to avoid lock-in — it deploys to any server you own with no vendor tie-in. Fly.io does not document a lock-in stance, but by design your app runs as Machines on Fly's own infrastructure.