Fly.io vs LaunchDarkly
Run your app close to users, globally
vs. Enterprise feature management, experimentation, release automation
Pricing tiers
Fly.io
Pay-as-you-go
No monthly fee. Machines billed per second. Free allocations: ~3 small shared machines + 3 GB volumes.
$0 base (usage-based)
Shared CPU 1x — 256 MB
Entry VM. 1 shared vCPU, 256 MB RAM. ~$2.02/month continuously on.
$2/mo
Performance 1x — 2 GB
Dedicated 1 vCPU, 2 GB RAM.
$32/mo
Reservation — Shared (1 yr)
$36/year for $5/mo credit (40% savings).
$36/mo
Shared CPU 8x — 16 GB
8 shared vCPU, 16 GB RAM.
$89/mo
Performance 16x — 128 GB
Dedicated 16 vCPU, 128 GB RAM.
$1014/mo
Enterprise
Custom. Dedicated capacity, SLA.
Custom
LaunchDarkly
Developer (Free)
Free forever. Unlimited seats + flags + projects. 30 SDKs. 5K session replays/mo. 10M logs/traces.
Free
Foundation
$12/month per service connection + $10/month per 1K client-side MAU. Unlimited seats, experimentation, SSO.
$12/mo
Enterprise
Custom. Advanced targeting, release automation, workflows, approvals, SAML/SCIM, custom roles.
Custom
Guardian
Custom. All Enterprise + release monitoring, guardrail metrics, auto pause/rollback.
Custom
Free-tier quotas head-to-head
Comparing pay-as-you-go on Fly.io vs developer on LaunchDarkly.
| Metric | Fly.io | LaunchDarkly |
|---|---|---|
| No overlapping quota metrics for these tiers. | ||
Features
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.
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.
Developer interfaces
| Kind | Fly.io | LaunchDarkly |
|---|---|---|
| CLI | flyctl CLI | LaunchDarkly Relay Proxy |
| SDK | — | go-server-sdk, launchdarkly-android-client-sdk, launchdarkly-ios-client-sdk, launchdarkly-java-server-sdk, launchdarkly-js-client-sdk, launchdarkly-node-server-sdk, launchdarkly-react-client-sdk, launchdarkly-react-native-client-sdk, LaunchDarkly.ServerSdk, launchdarkly-server-sdk-python |
| REST | Machines API | LaunchDarkly REST API |
| GRAPHQL | Fly GraphQL API | — |
| OTHER | Fly Postgres (wire) | Streaming Flag Eval, Webhooks |
Staxly is an independent catalog of developer platforms. Outbound links to Fly.io and LaunchDarkly are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.
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