Helicone vs Fly.io

Helicone

Fly.io

Helicone · 16 features

• Alerts — Thresholds on error rate, latency, cost, usage. Pro+.
• Async Logging — Log AFTER the LLM call via SDK — zero added latency.
• Cost Tracking — Automatic cost calculation per call by provider/model.
• Dashboard — Request tables, aggregate metrics, cost breakdowns.
• Evaluators — LLM-as-judge + custom evaluators on runs.
• Experiments — A/B test different models/prompts.
• HQL (SQL over traces) — Query your logged data with SQL. Pro+.
• PII Redaction — Automatically scrub emails, credit cards, etc. from logs.
• Prompt Caching — Cache identical requests → save money.
• Prompts & Versions — Store + version + A/B test prompts.
• Proxy Mode — 1-line integration via base URL swap. Captures all requests.
• Rate Limiting — Per-user + per-key rate limit policies.
• Reports — Scheduled email reports with KPIs.
• Self-Hosting — Docker + k8s deployment.
• Sessions — Group related calls (chat sessions, agent runs).
• User Metrics — Per-user cost + usage segmentation.

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.