Restate

Restate is a durable execution runtime that records every step, LLM call and tool call of an application so it can resume after a crash without redoing finished work. It is for engineering teams building long-running AI agents, workflows and distributed backends who would otherwise write their own retry, state and recovery code.

Restate is a durable execution platform built by Restate GmbH in Berlin, a company founded in 2024 by the team that created Apache Flink, including CEO Stephan Ewen, Igal Shilman and Till Rohrmann, with former Stripe and Meta executive Ahmed Forghal. The server is a single binary built on its own distributed log and event-driven orchestrator, so it needs no external database; clustering the same binary gives high availability. Developers write ordinary handlers with SDKs for TypeScript, Java and Kotlin, Python, Go and Rust, and Restate journals each step so a retry resumes where the last attempt stopped. It adds exactly-once service-to-service calls, durable timers and promises, and isolated key-value state per entity through what it calls virtual objects. For AI agents, the docs show LLM and tool calls wrapped in durable steps, multi-turn sessions keyed by ID, human-in-the-loop approvals that survive restarts, multi-agent handoffs, and controls to pause, cancel or roll back a stuck agent, with integrations for the Vercel AI SDK, OpenAI Agents SDK, Google ADK, Pydantic AI and LangChain. Replit uses Restate for durable orchestration in the current Replit Agent, and the company says hundreds of firms run it, including Fortune 500 companies. The server is licensed under the Business Source License 1.1, which converts to Apache 2.0 after four years. Restate Cloud offers a free tier and paid plans metered by durable actions, plus a Bring Your Own Cloud option. In September 2026 Restate raised a $20M Series A led by Singular, bringing total funding to $27M, and opened a San Francisco commercial hub. Its main competitor is Temporal.

Category

Agent Development

Pricing

Freemium, Usage-based, Subscription

Target Market

CTOs, Platform Engineers, Enterprise Developers, AI Engineers

Deployment

Self-hosted, Cloud-first, Hybrid

Founded

2024

Headquarters

Berlin, Germany

Customers

Hundreds of companies, per the company, including Replit and Fortune 500 firms

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  Durable execution journal

  Records each completed step so a retried handler resumes from its last checkpoint instead of re-running LLM calls or side effects.

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  Durable agent sessions

  Keys multi-turn agent sessions by ID with built-in concurrency control, so conversations persist across crashes and scale to thousands of sessions.

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  Human-in-the-loop approvals

  Durable promises let an agent pause for a human decision and resume when it arrives, even after the process restarts.

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  Virtual objects with state

  Gives each entity isolated key-value state stored with execution progress, removing the need for a separate database for agent memory.

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  Exactly-once messaging and timers

  Request-response, one-way and scheduled calls between services are delivered exactly once, with durable timers that survive restarts.

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  Agent framework integrations

  Works with Vercel AI SDK, OpenAI Agents SDK, Google ADK, Pydantic AI and LangChain, or any LLM SDK wrapped in durable steps.

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  Built-in observability and control

  A UI and CLI show step-by-step execution journals with automatic OpenTelemetry traces, and let operators pause, cancel, kill or roll back executions.

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  Coding agent orchestration

  Replit uses Restate to orchestrate Replit Agent so long-running coding sessions keep their progress through failures and infrastructure faults.

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  Approval-gated agent actions

  An enterprise agent drafts a refund or contract change, waits durably for a manager's approval, then executes once without duplicating the action.

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  Multi-agent routing

  A support system hands tasks between specialist agents, with each routing decision persisted so a crash never loses or repeats a handoff.

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  Reliable transactional workflows

  A fintech runs payment and onboarding flows as durable workflows, guaranteeing exactly-once side effects across several downstream services.

Restate Cloud is metered by durable actions (invocations, steps, sleeps, RPC calls, completions); state reads and writes are free. Overage is $25 per million actions up to 100M, then $10 per million. A HIPAA BAA costs $300/month extra on Business and multi-AZ $200/month. Self-hosting is free under the BSL. Plan figures come from a third-party pricing summary dated October 8, 2026, because the vendor pricing page did not render for us; confirm before buying.

This page was written from 7 sources, 7 on domains other than restate.dev.

1. 1.github.com — restate
2. 2.docs.restate.dev — ai
3. 3.tech.eu — berlin based restate raises 20m
4. 4.unite.ai — unite.ai
5. 5.devtune.ai — pricing
6. 6.hn.algolia.com — search
7. 7.raw.githubusercontent.com — LICENSE