# Agents-Flex vs Mastra

Agents-Flex records 5,088 monthly visits with +202.3% month-over-month growth and Free / Open Source pricing. Mastra records 318,954 monthly visits with -5% growth and Freemium, Contact for Pricing pricing.

| Metric | [Agents-Flex](https://openaitools.app/tool/agents-flex) | [Mastra](https://openaitools.app/tool/mastra) |
| :--- | :--- | :--- |
| Website URL | https://agentsflex.com | https://mastra.ai |
| Categories | AI Developer Tools, Large Language Models (LLMs), Prompt Engineering, AI Agent | AI Agent, AI Developer Tools, AI Workflow, AI App Builder |
| Pricing Model | Free / Open Source | Freemium, Contact for Pricing |
| Monthly Visits | 5,088 | 318,954 |
| MoM Growth Rate | +202.3% | -5% |
| Primary Market | China | United States |
| Direct Visits | 426 | 139,222 |
| Review Score | 4.6 | 4.6 |
| Saved Count | 0 | 0 |
| Supported Platforms | Website | Website |

## Agents-Flex

Agents-Flex is an Apache 2.0 open-source framework aimed at Java developers who want to build AI applications and autonomous agents without leaving the JVM ecosystem. It works on JDK 8+ and does not force a Spring dependency, so it can slot into existing enterprise Java stacks cleanly. The entry point is a unified chat model API: configure a provider such as OpenAI with an API key and model name, then call chat() to get a response.

Beyond basic model calls, Agents-Flex is designed as a composable toolkit. You layer in knowledge retrieval (RAG), tools and function calling, multimodality, OCR, and a Skills system where reusable, versionable capability packages combine a SKILL.md description with scripts and assets. A SkillRuntime exposes consistent command, file and search interfaces across local or remote execution targets, so long-running tasks like OCR and video generation can be submitted async and polled by status.

The framework emphasizes architectural clarity and production readiness. Its AgentRunner orchestrates policy and middleware, while a Turn Store persists snapshots and events for long-task recovery. Streaming responses, synchronous image generation and asynchronous task handling are all first-class, and observability hooks help teams operate these systems in production rather than just prototype them.

**Pricing & Plans:** Agents-Flex is free and open source under the Apache 2.0 license. There is no commercial license fee for the framework itself; costs come only from the LLM or cloud providers you connect.

- **Unified chat model API:** Configure any supported provider with an API key and model name, then call chat() for a consistent interface across models.
- **Agent orchestration:** AgentRunner combines policy and middleware to coordinate models, tools and sandboxes inside a single execution flow.
- **Skills packages:** Reusable, versionable capability definitions that bundle a SKILL.md, scripts and assets, discovered from local directories or remote storage.
- **RAG, multimodality & OCR:** Add knowledge retrieval, image generation and OCR pipelines on demand, mixing synchronous and asynchronous execution styles.
- **Production runtime:** A Turn Store persists snapshots and events so long-running tasks can recover, supported by streaming responses and observability.

**Strengths:** Apache 2.0 open source with a permissive license for commercial use; Java-native design that fits existing JVM and enterprise stacks; Composable architecture covering RAG, tools, Skills and OCR in one framework; Async task handling and a Turn Store for reliable long-running workloads

**Limitations:** Documentation and community content skew toward Chinese, which may slow English-only teams; As a younger framework, the surrounding ecosystem is smaller than more established Python options; Requires Java expertise, so it is not aimed at non-developers

[Profile (Markdown)](https://openaitools.app/tool/agents-flex.md)

## Mastra

Mastra is an open-source TypeScript framework designed for developers who want to build AI agents and workflows in the same language as the rest of their stack. Instead of stitching together a Python agent library plus a separate orchestration layer, teams define typed agents, workflows, and tools directly in TypeScript. Core building blocks include Agents (instructions, models, tools, runtime behavior), Workflows (typed steps, retries, branching), a Harness for multi-mode agents, and Memory that adds durable context through observational memory and semantic recall.

Beyond the framework, Mastra ships an opinionated observability layer: traces, metrics, logs, evaluations, datasets, and scorers, so you can see exactly what an agent did on every run and measure quality before shipping changes. Agents can register on a single Mastra server that runs locally and deploys to Mastra Cloud, and integrations cover major model providers plus MCP servers for tool use.

The project is Apache 2.0 open source and can be self-hosted, while Mastra Cloud adds managed deployment, collaboration, and enterprise controls such as RBAC, SSO, and VPC deployment. Pricing follows a freemium model with a free open-source path and contact-for-pricing cloud plans.

**Pricing & Plans:** Freemium. The framework is Apache 2.0 open source and free to self-host. Mastra Cloud offers paid/managed tiers, with enterprise pricing available on request.

- **Typed agents and workflows:** Define agents with instructions, models, tools, and runtime behavior, then compose typed workflow steps with retries and branching in TypeScript.
- **Durable agent memory:** Give agents long-lived context with observational memory, semantic recall, and thread-aware storage.
- **Built-in observability:** Traces, metrics, logs, and datasets show every model call, tool call, and handoff in a searchable timeline.
- **Evaluations and scorers:** Score agent runs against repeatable checks and experiments before changes reach production.
- **MCP and model integrations:** Connect MCP servers for tool use and route across major model providers including OpenAI, Anthropic, Google Gemini, and xAI.

**Strengths:** TypeScript-first design fits existing JavaScript and Node.js stacks; Apache 2.0 open source with a free self-hosted path; Observability, evals, and datasets are built in rather than bolted on; Memory, workflows, MCP, and multi-provider routing included

**Limitations:** Requires TypeScript and developer familiarity to get value; Cloud and enterprise pricing is quote-based with limited public detail; Fast-moving framework means APIs can change between releases; Best suited to engineering teams, not no-code users

[Profile (Markdown)](https://openaitools.app/tool/mastra.md)

## Frequently Asked Questions

### How do Agents-Flex and Mastra compare in monthly traffic?

Agents-Flex has 5,088 monthly visits, while Mastra has 318,954. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Agents-Flex has a month-over-month growth rate of +202.3%; Mastra has -5%.

### How does pricing compare?

Agents-Flex: Free / Open Source. Agents-Flex is free and open source under the Apache 2.0 license. There is no commercial license fee for the framework itself; costs come only from the LLM or cloud providers you connect. Mastra: Freemium, Contact for Pricing. Freemium. The framework is Apache 2.0 open source and free to self-host. Mastra Cloud offers paid/managed tiers, with enterprise pricing available on request.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Ollama](https://openaitools.app/tool/ollama) | 9,421,973 | +4.3% | Free, Freemium, Paid | Run and build with open AI models locally or in the cloud | [.md](https://openaitools.app/tool/ollama.md) |
| 2 | [n8n](https://openaitools.app/tool/n8n) | 4,522,449 | -7.4% | Freemium | A robust workflow automation platform uniting visual node-based building with AI agent orchestration and extensive app connectors. | [.md](https://openaitools.app/tool/n8n.md) |
| 3 | [Composio](https://openaitools.app/tool/composio) | 2,782,603 | +22.8% | Freemium, Contact for Pricing | A developer platform providing pre-built integrations, authentication, and execution tools specifically for AI agents across third-party apps. | [.md](https://openaitools.app/tool/composio.md) |
| 4 | [Exa](https://openaitools.app/tool/exa-ai) | 1,062,574 | +16.8% | Freemium, Contact for Pricing | Web search API and crawler built for AI agents | [.md](https://openaitools.app/tool/exa-ai.md) |
| 5 | [Dify](https://openaitools.app/tool/dify-ai) | 819,691 | -15% | Freemium | A comprehensive visual platform for building agent workflows and RAG pipelines via a no-code canvas instead of TypeScript. | [.md](https://openaitools.app/tool/dify-ai.md) |
| 6 | [LlamaIndex](https://openaitools.app/tool/llamaindex) | 387,910 | +19.9% | Freemium, Contact for Pricing | Turn any document into AI-ready context with agentic parsing and extraction | [.md](https://openaitools.app/tool/llamaindex.md) |
| 7 | [ERNIE Agent Platform (AgentBuilder)](https://openaitools.app/tool/ernie-agent-platform) | 371,311 | +9.3% | Contact for Pricing | Baidu's one-stop platform for building, distributing and monetizing AI agents | [.md](https://openaitools.app/tool/ernie-agent-platform.md) |
| 8 | [Pinecone](https://openaitools.app/tool/pinecone) | 286,732 | -31% | Freemium, Paid, Contact for Pricing | The managed vector database and knowledge engine for production AI | [.md](https://openaitools.app/tool/pinecone.md) |
| 9 | [Activepieces](https://openaitools.app/tool/activepieces) | 258,553 | +1.5% | Freemium | An open-source AI automation platform combining conversational workflow drafting, visual flow builders, and prebuilt app connectors. | [.md](https://openaitools.app/tool/activepieces.md) |
| 10 | [Sim AI](https://openaitools.app/tool/sim-ai) | 140,953 | +20.6% | Freemium, Paid (per user/month), and Enterprise with custom pricing; self-hosting free under Apache 2.0 | An open-source AI workspace combining visual workflows and code for building and governing agent systems. | [.md](https://openaitools.app/tool/sim-ai.md) |

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Source: https://openaitools.app/compare/agents-flex-vs-mastra

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