Fly.iovsPlanetScale

Features Compared

Fly.io is a global VM deployment platform designed to run full-stack applications close to users across multiple regions. Its core strengths include the ability to run any Docker container globally, fast anycast routing that directs traffic to the nearest region, persistent volumes for stateful workloads, managed Postgres databases, and private networking capabilities. This makes Fly.io a comprehensive compute and infrastructure solution—you can deploy entire applications, manage databases, and handle networking all within one platform.

PlanetScale takes a narrower but specialized approach, focusing exclusively on database infrastructure. It provides serverless MySQL with branch-based schema changes, powered by the battle-tested Vitess engine. Key differentiators include the ability to create database branches for safe schema migrations without blocking reads or writes, non-blocking schema changes, performance insights, and global replicas for horizontal scaling. PlanetScale excels where database reliability and schema agility matter most, but it does not handle application compute or broader infrastructure concerns. Notably, PlanetScale offers MySQL only—there is no Postgres option—while Fly.io includes managed Postgres as part of its platform.

Pricing & Value

Fly.io offers a free tier that allows developers to start building at no cost, making it accessible for prototyping and small projects. PlanetScale discontinued its free tier and now starts at $39 per month, positioning it as a paid-first service. This pricing difference fundamentally changes the value proposition for early-stage teams and hobbyists. However, the comparison becomes more nuanced at scale: PlanetScale's pricing may become expensive for small teams running larger databases, while Fly.io's per-resource consumption model scales differently depending on compute and storage needs.

• Fly.io: Free tier available; pricing scales with compute and storage usage
• PlanetScale: Starts at $39/month; no free tier; flat-rate plans with defined resource allowances
• Best for bootstrapped teams: Fly.io wins due to free tier; PlanetScale requires upfront investment
• Best for database-heavy applications: PlanetScale's pricing may be predictable for large databases; Fly.io's consumption model may vary more

Ease of Use & Onboarding

Fly.io operates primarily through a CLI-first interface, which gives power users fine-grained control but introduces a steeper learning curve compared to visual platforms. The trade-off is flexibility—you can deploy any Docker container—but onboarding requires command-line familiarity and understanding of its deployment model. Cold starts on scaled-to-zero applications can also surprise new users. PlanetScale, by contrast, is database-specific and designed for developers already familiar with MySQL. Its branch-based workflow is intuitive for engineers used to Git branching patterns, making schema migrations feel familiar rather than foreign. For full-stack deployment, Fly.io demands more learning; for database management, PlanetScale feels more approachable to its target audience.

Integration & Ecosystem

Fly.io functions as a complete deployment platform, so it integrates with any Docker-compatible application, any database client, and any CI/CD system that can invoke its CLI or API. This universality is powerful but also means integration is largely the responsibility of the developer. PlanetScale integrates tightly with MySQL tooling—any framework or ORM that speaks MySQL (Prisma, Sequelize, SQLAlchemy, etc.) works seamlessly—and provides insights dashboards for monitoring query performance. However, PlanetScale is a database-only solution; it does not handle compute, so teams need a separate deployment platform (such as Fly.io, Vercel, Railway, or others) to pair with it. Neither platform has documented vendor lock-in risks, but PlanetScale's MySQL-only constraint is more restrictive than Fly.io's Docker-first flexibility.

Who Should Choose Fly.io?

Fly.io is ideal for teams building full-stack applications who want to deploy both application code and databases on a single platform with global reach. It suits developers comfortable with the CLI and Docker, startups that benefit from a free tier during early development, and applications requiring persistent volumes or custom networking. Choose Fly.io if you need to run stateful services globally, want to avoid multi-platform complexity, or require more than just database infrastructure—such as caching layers, background job workers, or microservices deployed to the same regions.

Who Should Choose PlanetScale?

PlanetScale is the right choice for teams whose primary concern is database reliability, schema agility, and horizontal scaling. It suits applications already built on MySQL that need safe, non-blocking migrations and the ability to branch databases for testing schema changes before production. Choose PlanetScale if you have budget for a dedicated database service ($39/month minimum), your application is MySQL-based, or you need the performance insights and global replication that Vitess provides. PlanetScale works best when paired with a separate compute platform—such as Fly.io—and is strongest for teams where database schema management and query performance are central challenges.