Quick verdict
Most "open source alternatives to Eve" listicles treat Eve as closed SaaS. It is not. The eve npm package is Apache-2.0. Vercel runs it in production. You can init locally and, on paper, self-host.
What those listicles are actually asking: which OSS stack lets me ship production agents without Vercel Workflows, Sandbox, Connect, and AI Gateway as the bill. License and gravity are different questions.
- Stay on Eve — you accept Vercel gravity (or a documented self-host path) because directory agents, channels, and Workflows durability are the hard part.
- Mastra — Apache-2.0 TypeScript batteries; the usual portable OSS alternative when the team still wants one framework.
- LangGraph — OSS durable graphs; best when failure cost is the product risk and Python depth matters.
- Strands Agents — Apache-2.0 AWS-native loop; best when IAM/VPC/residency is the questionnaire.
- CrewAI — OSS role crews + Flows; best when the org already thinks in specialist agents.
- OpenAI Agents SDK — MIT primitives; best when you do not need a framework yet.
Cipher's cutover rule: an Apache license does not make the happy path portable. Eve's adapters (Sandbox, Connect, Workflows) are why it is fast on Vercel and slow to leave. Pick an alternative when you must leave those meters — not because a blog called Eve "proprietary." The broader shortlist (including when to stay) lives in Eve alternatives. This page is the OSS / self-host cut only.
Eve is not a substitute for the Vercel AI SDK. The SDK is also open. It is a toolkit, not an agent OS — Eve vs AI SDK.
Last updated: August 2026. Re-verify licenses and self-host guides on draft day; preview APIs move.
OSS shortlist
| Option | License (verify) | Leaves Vercel meters? | Honest limit |
|---|---|---|---|
| Eve itself | Apache-2.0 | Self-host path exists; happy path does not | Preview/beta; deepest features assume Vercel adapters |
| Mastra | Apache-2.0 core | Yes — Node / Cloudflare / container / Hono | You assemble sandbox and workplace channels |
| LangGraph | OSS (LangChain ecosystem) | Yes — you host the graph and checkpointer | Heavier prototype; TS port trails Python |
| Strands Agents | Apache-2.0 | SDK yes; value shows on AWS + AgentCore | You trade Vercel gravity for AWS gravity |
| CrewAI | MIT (verify current) | Yes | Not the default for Next.js product agents |
| OpenAI Agents SDK | MIT | Yes — any Node host | You rebuild durability, sandbox, channels, evals |
When paid Vercel still wins
Stay on Eve — including paid Workflows, Sandbox, and Gateway — when the product already deploys on Vercel and the missing work is channels, isolated compute, and durable sessions. Replacing Eve with Mastra solely to "be more open source" is fashion. Eve is already open. You are buying adapters and an ops surface you will otherwise staff.
Self-host Eve if compliance requires it and you have read the current deployment guide on eve.dev. Do not promise a board "we can leave Vercel tomorrow" because the repo says Apache-2.0. Zack Proser's review and Vercel's own preview notes say the same thing: the coupling is the product.
Cost honesty: Eve has no flat agent SKU. You pay Functions, Workflows, Sandbox minutes, AI Gateway, and model tokens. Compare that bill to Mastra on a container you already run — what it costs to run an AI product.
Mastra and LangGraph — the two real OSS exits
Mastra is the TypeScript exit. Workflows, memory, RAG, evals, and Studio in one package. You lose Eve's channel files and first-class sandbox. You gain a host you choose. Pairwise: Eve vs Mastra · features vs Mastra.
LangGraph is the failure-cost exit. Explicit graphs, checkpoints, interrupt(). You lose directory DX. You gain an auditable control flow. Pairwise: Eve vs LangGraph.
Strands is the AWS exit, not a "no cloud" exit. Read Eve vs Strands before you treat it as generic OSS.
The cutover in practice
| If you need… | Pick |
|---|---|
| OSS license and Vercel channels/sandbox this month | Eve (it is already OSS) |
| Portable TS framework off Vercel meters | Mastra |
| OSS durable graphs / audit trails | LangGraph |
| OSS loop inside an AWS account you already run | Strands (+ AgentCore) |
| OSS role crews | CrewAI |
| OSS primitives, no framework | Agents SDK — Eve vs Agents SDK |
| Only streamed chat UI | Vercel AI SDK — not an Eve alternative |
FAQ
Is Eve open source? Yes. Apache-2.0 on the published framework. Preview/beta terms still apply to APIs and Vercel platform behavior. Read the repo license and Vercel product terms separately.
What is the best open-source alternative if I cannot use Vercel at all? Mastra for TypeScript product agents. LangGraph for high failure-cost graphs. Strands if the estate is AWS. That is the shortlist we actually implement.
Is n8n an open-source Eve alternative? For workflow automation, sometimes. For durable code-first agents with sandboxes and evals, usually no — n8n vs custom agent frameworks.
Who helps Australian and Singapore teams leave or stay? Cipher Projects — we will not sell a rewrite to "become open source" when Eve already is, and we will not hide Vercel gravity when you need to leave it.
Conclusion
Open-source alternatives to Eve start with a fact: Eve is already open. Leave when you must leave Vercel meters or AWS inheritance is the real constraint. Mastra, LangGraph, and Strands are the exits we trust. Stay when the adapters are the product and you would staff them yourself.
Related: Eve alternatives · Eve vs Mastra · Eve vs Strands · four-way comparison