---
title: "ACI.dev Pricing, Features & Alternatives (2026)"
description: "ACI.dev review: Agent Auth & Tool Calling tool — Free tier, plans, pros & cons, and the best ACI.dev alternatives compared for startups in 2026."
source: https://appstackbuilder.com/tools/aci-dev
retrieved: 2026-10-17
---

![ACI.dev logo](https://www.google.com/s2/favicons?domain=aci.dev&sz=128)

[Agent Auth & Tool Calling](https://appstackbuilder.com/categories/agent-auth)Free tier

# ACI.dev: Pricing, Features & Alternatives

ACI.dev (Agent-Computer Interface) is an Apache-2.0 platform that connects agents to 600+ tools through direct function calling or one unified MCP server. It includes multi-tenant OAuth flows and secrets management for each of your end users, dynamic tool discovery, and natural-language permission boundaries on what an agent may do. You can run the full backend and frontend yourself or use the managed service at aci.dev. It is the most permissively licensed option in this category, but the main repository has had no commits since May 2026, so check its activity before you depend on it.

Category

Agent Auth & Tool Calling

Pricing

Free tier available

Free tier

Yes

Best for

Agent Auth & Tool Calling — open-source, mcp

[Visit ACI.dev official site](https://www.aci.dev)

## ACI.dev Pricing Plans (2026)

| Plan               | Price           | Highlights                                                  |
| ------------------ | --------------- | ----------------------------------------------------------- |
| Open sourcePopular | $0 (Apache-2.0) | 600+ integrations · Multi-tenant OAuth · Unified MCP server |
| Managed            | See vendor      | Hosted at aci.dev                                           |

Pricing summary: Free · then usage-based. Always confirm current pricing on the official site.

## Key ACI.dev Features

* ✓600+ integrations
* ✓Multi-tenant OAuth
* ✓Unified MCP server
* ✓Self-hosted

### ✓ Pros

* +Apache-2.0: truly open source and self-hostable
* +Multi-tenant OAuth for end users built in
* +One MCP server for all tools

### ✗ Cons

* −No commits to the main repo since May 2026
* −Smaller catalog than hosted rivals
* −You run and secure the token store yourself

## Best ACI.dev Alternatives

[Compare all ](https://appstackbuilder.com/tool-alternatives/aci-dev)

[![Composio logo](https://www.google.com/s2/favicons?domain=composio.dev&sz=128)ComposioFree · paid from $29/mo](https://appstackbuilder.com/tools/composio)[![Arcade logo](https://www.google.com/s2/favicons?domain=arcade.dev&sz=128)ArcadeFree · paid from $25/mo](https://appstackbuilder.com/tools/arcade-dev)[![Nango logo](https://www.google.com/s2/favicons?domain=nango.dev&sz=128)NangoFree · paid from $50/mo](https://appstackbuilder.com/tools/nango)

## ACI.dev Compared

[ACI.dev vs Composio](https://appstackbuilder.com/compare/aci-dev-vs-composio)[ACI.dev vs Arcade](https://appstackbuilder.com/compare/aci-dev-vs-arcade-dev)[ACI.dev vs Nango](https://appstackbuilder.com/compare/aci-dev-vs-nango)

[In-depth guideComposio vs Arcade (2026): Agent Auth & Tool Calling, Plus Open-Source Nango and ACI.devYour agent has to act inside Gmail, Slack and Salesforce as each of your users, without the model seeing a token. Composio and Arcade compared with Nango and ACI.dev on OAuth handling, licence and cost at 50 and 1,000 users.](https://appstackbuilder.com/blog/composio-vs-arcade-agent-auth-2026)

## ACI.dev FAQ

What is ACI.dev used for?⌄

ACI.dev is a agent auth & tool calling tool. Open-source (Apache-2.0) tool-calling platform: 600+ integrations, multi-tenant OAuth for end users, and a unified MCP server.

Is ACI.dev free?⌄

Yes — ACI.dev has a free tier you can start with, and paid plans for more usage and features.

How much does ACI.dev cost?⌄

ACI.dev is free to use, with usage-based pricing on some features.

What are the best ACI.dev alternatives?⌄

Popular ACI.dev alternatives include Composio, Arcade, Nango. Compare pricing and features on our ACI.dev alternatives page.

## Not sure if ACI.dev fits your stack?

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[Build my stack free ](https://appstackbuilder.com/)