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What is Sprites?

Sprites by Fly.io is a platform for creating stateful sandbox environments that run arbitrary code inside hardware-isolated Linux computers. A Sprite is designed to answer the question of where to safely run a blob of code, whether that code comes from an AI agent, a developer workflow, a user-uploaded binary, or an application process. Unlike short-lived stateless sandboxes, Sprites are persistent environments that can keep files, state, and execution context across runs. The platform supports checkpoint and restore so workloads can pause, resume, and recover without rebuilding everything from scratch. Sprites use a fast directly attached NVMe filesystem for active work and continuously sync that filesystem to durable external object storage. This storage model gives developers a normal Linux disk experience while supporting durable persistence and automatic growth. Developers can install the Sprites CLI, log in, create a Sprite, run commands, and connect directly to a Sprite console. The platform also provides a REST API and language support for JavaScript, Go, Elixir, and Python. Sprites include capabilities around persistence, checkpoints, Sprite URLs, sandbox VMs, and network policy for controlling how environments run and connect. Pricing is based on actual usage across CPU hours, memory hours, hot storage, and cold storage, making it practical for bursty workloads like coding agents or lightweight web apps. By combining hardware isolation, Linux compatibility, stateful persistence, checkpointing, durable storage, APIs, and usage-based billing, Sprites gives developers a flexible execution layer for AI agents, sandboxed code, and persistent application environments.

What is Agent Substrate?

Agent Substrate is an open-source runtime that enables the creation and management of isolated, stateful agent and code-execution sandboxes tailored for Kubernetes ecosystems. It efficiently oversees the lifecycle of actors and workers, directing active workloads to a shared pool of resources, and can pause inactive sandboxes while preserving their memory and filesystem states for later utilization. By leveraging gVisor or Cloud Hypervisor microVMs for enhanced isolation, these sandboxes are equipped with distinct identity and networking controls for every actor. This platform is specifically designed for infrastructure and platform teams engaged in developing services for agent hosting, coding environments, and other activities that may involve untrusted or intermittent execution. The core framework is built to be portable across Kubernetes, with Google Cloud offering specialized deployment tools that are fine-tuned for GKE. Furthermore, users have the option to incorporate Filestore agent volumes to ensure that workspaces remain intact and retrievable throughout suspension and resumption cycles, thereby increasing the reliability of the development environment. By enabling such capabilities, Agent Substrate proves to be an indispensable resource for contemporary cloud-native applications, empowering teams to streamline their operations and maximize efficiency in managing complex workloads.

Media

Media

Integrations Supported

Go
JavaScript

Integrations Supported

Google Cloud Filestore
Google Cloud Platform
Model Context Protocol (MCP)

API Availability

Has API

API Availability

Has API

Pricing Information

$30 per month
Free Trial Offered?

Pricing Information

$0
Agent Substrate on GKE is offered at no extra charge. GKE pricing applies to the resources you create.
Free Version

Supported Platforms

SaaS

Supported Platforms

On-Prem
Linux

Customer Service / Support

Web-Based Support

Customer Service / Support

Not specified

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

Fly.io

Company Location

United States

Company Website

fly.io/sprites

Company Facts

Organization Name

Google

Date Founded

1998

Company Location

United States

Company Website

github.com/agent-substrate/substrate

Categories and Features

Categories and Features

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