LaunchDarkly vs Fly.io

LaunchDarkly

Fly.io

LaunchDarkly · 15 features

• AI Configs — Manage AI prompts, models, and parameters as flags.
• Approvals — Require co-sign before flag changes in prod.
• Audit Log — Every change logged with user + timestamp.
• Auto Pause/Rollback — Guardrail metrics auto-revert a bad release.
• Code References — Scan code for flag references + stale flag cleanup.
• Contexts — Multi-context targeting: user + organization + device in one evaluation.
• Experimentation — A/B/n testing with stat significance. Bayesian + frequentist.
• Feature Flags — Boolean, multivariate (string/number/JSON) flags with targeting rules.
• Observability — Logs + traces + errors linked to flag changes.
• Relay Proxy — Self-hosted evaluation proxy for compliance / low-latency.
• Release Pipelines — Progressive rollout workflows with guards + approvals.
• SAML / SCIM — Enterprise SSO + SCIM provisioning.
• Session Replay — Frontend session recordings tied to flag exposure.
• Targeting Rules — Rule-based targeting on user attributes, country, device, custom contexts.
• Workflows — Scheduled flag changes + conditional workflows.

Fly.io · 14 features

• Auto Stop/Start — Machines auto-stop when idle, start on request (like scale-to-zero).
• Certs — Let's Encrypt + wildcard certs managed.
• Fly GPU — A100/L40S/A10 on-demand GPU machines.
• Fly Kubernetes (FKS) — Managed Kubernetes on Fly machines.
• Fly Machines — Firecracker microVMs. Start in <1s. Run any Docker image.
• Fly Postgres — Managed Postgres via Supabase partnership (2024). Also legacy self-run Postgres …
• fly-replay headers — Route request to another region at app level.
• Fly Volumes — Persistent SSD attached to a Machine. Encrypted at rest.
• Global Anycast — Single IP routes to the closest region automatically.
• LiteFS — Distributed SQLite with primary/replica across regions.
• Private Networks — 6PN WireGuard mesh. Connect machines across regions privately.
• Secrets — Encrypted env vars propagated to all regions.
• Tigris (partner) — S3-compatible storage for Fly apps. By partner.
• Upstash Redis (partner) — Managed Redis via Upstash.