Life is short. Use Python.

Python, Unchained.

The Instant Runtime that Python deserves.

🚧 Heavy Work In Progress. Not ready for production. Expect breaking changes.

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🚀 Why Velo?

The "Python Tax"	The Velo Fix
Cold starts take 500ms+	60x faster with Zygote pre-warming
Model loading is slow	Fork pre-loaded models in <20ms
Tests block your flow	40x faster pytest runs
Deploys are complex	Single command: velo serve main:app

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⚡ 60x Faster. See It To Believe It.

╔════════════════════════════════════════════════════════════╗
║              FastAPI Hello World (Startup)                 ║
╠════════════════════════════════════════════════════════════╣
║  CPython           ██████████████████████████░░░░░  514ms  ║
║  Velo (Instant)    ░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░    8.6ms ⚡║
╚════════════════════════════════════════════════════════════╝
                      🚀 59.7x faster than CPython

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🎯 Who Is Velo For?

For AI & ML Engineers

"My Lambda function takes 10 seconds to cold start because of PyTorch."

Velo pre-loads your model into a Zygote. Every request forks from that warm state in <20ms. Memory is shared via Copy-on-Write.

→ Read the AI Inference Guide

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For Python Developers

"I spend more time waiting for tests than writing code."

Velo's pytest --velo plugin accelerates your test suite by 40x. Combined with Vibe Mode, you get instant feedback on every save.

→ Read the Developer Workflow Guide

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🛠️ Quick Start

git clone https://github.com/velo-sh/velo.git && cd velo
cargo build --release
./target/release/velo run examples/hello.py

Commands

# Run any Python script, 60x faster
velo run script.py

# Serve a web app (FastAPI, Django, Flask)
velo serve main:app --workers 4

# Accelerate your tests
pytest --velo

# Vibe Mode: instant hot-reload
velo run --vibe app.py

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📊 Compatibility

• Python: 3.11, 3.12, 3.13+ (single binary)
• Frameworks: FastAPI, Django, Flask, Celery
• Packages: 100% of PyPI Top 100 verified ✅

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📚 Documentation

Guide	Description
AI Inference	Deploy AI models with <20ms cold start
Developer Workflow	40x faster tests, instant hot-reload
Compatibility Charter	Our commitment to zero breaking changes

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🛡️ Enterprise Ready

• Zero Python Patch: We never modify CPython. Full compatibility guaranteed.
• SLO-Backed Performance: Fork latency P99 < 100ms, contractually.
• Security Hardened: Landlock isolation, process sandboxing, supply-chain audited.

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🤝 Special Thanks & Integrations

Velo stands on the shoulders of giants. We take pride in our deep integrations with the best tools in the Python ecosystem:

• uv: Velo's first-class dependency engine. We leverage uv for lightning-fast environment synchronization and reliable lockfile detection.
• Granian: Our high-performance HTTP server backend. Velo integrates Granian to provide the raw power behind velo serve.

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License

Apache-2.0