Deploy your Swift app to Fly.io
Step-by-step deployment help for Swift apps on Fly.io. We fix Swift-specific deployment issues, configure Fly.io, and get your app live. From $19.
Swift issues we fix before deploying
Common Swift problems that affect Fly.io deployments.
Force unwrapping optionals
Using ! to force-unwrap optionals instead of guard let or if let, causing runtime crashes when values are nil.
Storing secrets in UserDefaults
Saving API keys, tokens, and passwords in UserDefaults (plaintext plist) instead of Keychain, making them easily extractable from device backups.
Retain cycles from closures
Strong references to self inside closures and delegate patterns without [weak self] or [unowned self], causing memory leaks that grow over app lifetime.
Main thread blocking
Network requests, file I/O, and heavy computation performed on the main thread, freezing the UI and risking watchdog termination.
Fly.io deployment issues we check for
Common Fly.io problems that break Swift apps in production.
Dockerfile missing or misconfigured
Fly.io requires a Dockerfile for deployment. AI tools that scaffold without one force flyctl to auto-generate a suboptimal Dockerfile that misses build steps.
Volume only available in a single region
Fly volumes are pinned to one region. Multi-region deployments try to access a volume that doesn't exist in other regions, causing crashes.
Machine restarts losing in-memory state
AI-generated apps store session data or caches in memory. Fly machines can restart or migrate, wiping all in-memory state without warning.
Internal DNS resolution failing between services
Services within a Fly organization communicate via <app>.internal hostnames, but AI-generated code hardcodes localhost or public URLs.
Start with a self-serve audit
Get a professional review of your Swift project before deploying to Fly.io.
External Security Scan
Black-box review of your public-facing app. No code access needed.
- OWASP Top 10 vulnerability check
- SSL/TLS configuration analysis
- Security header assessment
- Expert review within 24h
Code Audit
In-depth review of your source code for security, quality, and best practices.
- Security vulnerability analysis
- Code quality review
- Dependency audit
- Architecture review
- Expert + AI code analysis
Complete Bundle
Both scans in one package with cross-referenced findings.
- Everything in both products
- Cross-referenced findings
- Unified action plan
100% credited toward any paid service. Start with an audit, then let us fix what we find.
How it works
Tell us about your app
Share your project details and what you need help with.
Expert + AI audit
A human expert assisted by AI reviews your code within 24 hours.
Launch with confidence
We fix what needs fixing and stick around to help.
Frequently asked questions
How do I deploy a Swift app to Fly.io?
We handle Swift deployments to Fly.io end to end. Start with our code audit ($19) to identify deployment blockers specific to your Swift project, then we configure Fly.io, fix issues, and get your app live in production.
What Swift issues affect Fly.io deployments?
Swift projects commonly have force unwrapping optionals and storing secrets in userdefaults. On Fly.io, these combine with dockerfile missing or misconfigured and volume only available in a single region to cause deployment failures.
Can SpringCode deploy my Swift project to Fly.io?
Yes. We specialize in deploying Swift applications to Fly.io. We audit your codebase for Swift-specific issues, configure Fly.io correctly, and handle the full deployment so your app runs reliably in production.
What does Swift deployment to Fly.io cost?
Our code audit ($19) identifies all Fly.io deployment blockers in your Swift project. Full deployment assistance is scoped with a fixed quote after the audit — no hourly billing or surprise charges.
Related resources
Other techs on Fly.io
Deploy Swift elsewhere
Need help deploying Swift to Fly.io?
Tell us about your project. We'll respond within 24 hours with a clear plan and fixed quote.