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Free StackAI alternatives: 5 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rank

5 of the 6 StackAI alternatives we track can be used for free (free, open source, or with a free plan). MindStudio, n8n and Langflow rank highest, with facts last verified Nov 8, 2026.

StackAI has been acquired. Being acquired by Asana, according to an announcement on the StackAI website.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1MindStudio logoMindStudioFree plan + paid$20/month + usageNoWeb, Browser extension4 of 468.8
2n8n logon8nFree plan + paid€20/month (annual), 2.5K executionsNoWeb, Self-hosted9 of 967.6
3Langflow logoLangflowOpen source—YesWeb, Windows, macOS +25 of 564.8
4Botpress logoBotpressFree plan + paid$150/month billed annually (Plus)NoWeb7 of 759.4
5Lindy logoLindyFree plan + paid$29.99 per user/month for 3,000 creditsNoWeb, Browser extension, iOS6 of 650.0
  1. MindStudio logo

    1. MindStudioTop pick

    Best for: Non-developers building AI agents and internal tools that mix many model types

    Free plan + paidWeb, Browser extension

    68.8

    score / 100

    Why switch from StackAI

    Self-serve no-code agent builder with a low-cost individual plan and 200+ models included.

    Pros

    • 200+ AI models available without managing API keys
    • Built-in debugger and model comparison for testing
    • Cheap individual plan with unlimited agents and runs
    • Says customer data is not used for training

    Cons

    • Model usage is billed on top of the plan fee
    • Free plan allows only one agent
    • SSO, audit logs and self-hosting are limited to higher tiers
    Visit MindStudio Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is MindStudio a good StackAI alternative?

    Verified facts

    4 of 4 verified
    Free plan
    1 agent, 1,000 runs/month + usage
    Checked Nov 8, 2026mindstudio.ai(opens source in a new tab)
    Individual plan
    $20/month + usage
    Checked Nov 8, 2026mindstudio.ai(opens source in a new tab)
    AI models
    200+
    Checked Nov 8, 2026mindstudio.ai(opens source in a new tab)
    Self-hosting
    Enterprise option
    Checked Nov 8, 2026mindstudio.ai(opens source in a new tab)
  2. n8n logo

    2. n8n

    Best for: Technical teams that want self-hosted automations and AI agents without per-task fees

    Free plan + paidSelf-hostableWeb, Self-hosted

    67.6

    score / 100

    Why switch from StackAI

    Self-hostable automation platform with AI agent nodes and a large integration library.

    Pros

    • Free self-hosted Community edition
    • Priced per execution, not per step
    • Code nodes and strong AI agent tooling

    Cons

    • Fair-code licence restricts commercial resale
    • Less friendly for non-technical users
    • SSO and version control need paid editions
    Visit n8n Details and reviews
    How this score is calculated
    Editorial fit ×0.346
    Reviews ×0.363
    Clicks (90 days) ×0.15100
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is n8n a good StackAI alternative?

    Verified facts

    9 of 9 verified
    Cloud starting price
    €20/month (annual), 2.5K executions
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    Pro price
    €50/month (annual), 10K executions
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    Self-hosting
    Yes, free Community edition
    Checked Nov 8, 2026docs.n8n.io(opens source in a new tab)
    Integrations
    2,000+
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    License
    Sustainable Use License (fair-code)
    Checked Nov 8, 2026docs.n8n.io(opens source in a new tab)
    Starting price
    €20/month billed annually (Starter, 2.5K executions)
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    Pro plan
    €50/month billed annually, 10K executions
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    Business plan
    €667/month billed annually, 40K executions, self-hosted
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
    Free trial
    14 days, no credit card
    Checked Nov 8, 2026n8n.io(opens source in a new tab)
  3. Langflow logo

    3. Langflow

    Best for: Developers prototyping AI agents and RAG flows visually who want Python-level control

    Open sourceSelf-hostableWeb, Windows, macOS, Linux, Self-hosted

    64.8

    score / 100

    Why switch from StackAI

    Open-source visual agent builder you can self-host for free, with full Python control.

    Pros

    • MIT licensed and free to self-host
    • Every component is editable Python code
    • Can expose flows as MCP servers and connect to external MCP tools
    • Works with many LLM providers and vector stores

    Cons

    • Assumes some understanding of LLM concepts like embeddings and vector stores
    • Self-hosted production setups need your own scaling and monitoring
    • No built-in channel integrations like WhatsApp or live-agent handoff
    Visit Langflow Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Langflow a good StackAI alternative?

    Verified facts

    5 of 5 verified
    License
    MIT
    Checked Nov 8, 2026github.com(opens source in a new tab)
    Open source
    Yes, Python-based
    Checked Nov 8, 2026docs.langflow.org(opens source in a new tab)
    MCP server
    Yes
    Checked Nov 8, 2026docs.langflow.org(opens source in a new tab)
    Desktop app
    Langflow Desktop
    Checked Nov 8, 2026docs.langflow.org(opens source in a new tab)
    Cloud
    Free cloud account
    Checked Nov 8, 2026langflow.org(opens source in a new tab)
  4. Botpress logo

    4. Botpress

    Best for: Support teams and agencies building AI agents that need custom logic and integrations

    Free plan + paidWeb

    59.4

    score / 100

    Why switch from StackAI

    Better fit when the main goal is a customer-facing chatbot on web and messaging channels.

    Pros

    • Free plan for testing with real conversations
    • No per-seat fees on the Team plan and above
    • Visual studio plus a developer kit for custom logic
    • Large community on Discord and an open-source SDK

    Cons

    • Paid plans start well above simple chat widgets
    • Conversation packs are added automatically once the quota is reached
    • Voice channel is only on the Enterprise plan
    Visit Botpress Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Botpress a good StackAI alternative?

    Verified facts

    7 of 7 verified
    Free plan
    Yes, $0 with 100 conversations
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
    Plus plan
    $150/month billed annually
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
    Pricing basis
    Per conversation, not per seat
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
    Security
    SOC 2, GDPR compliant
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
    GitHub repo licence
    MIT
    Checked Nov 2, 2026github.com(opens source in a new tab)
    Starting price
    $150/month billed annually (Plus)
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
    Team plan
    $750/month billed annually
    Checked Nov 8, 2026botpress.com(opens source in a new tab)
  5. Lindy logo

    5. Lindy

    Best for: Small teams that want an AI assistant in Slack to handle reports, inbox and CRM chores

    Free plan + paidWeb, Browser extension, iOS

    50.0

    score / 100

    Why switch from StackAI

    Hosted AI agents for business tasks like email and scheduling, with self-serve plans.

    Pros

    • Works from Slack, email and iMessage instead of a separate app
    • 1,500+ integrations plus MCP support
    • SOC 2 Type II, GDPR and HIPAA compliance

    Cons

    • Credit-based billing makes monthly costs hard to predict
    • Free credits are a short trial rather than a lasting free plan
    • Less deterministic than step-by-step workflow tools
    Visit Lindy Details and reviews
    How this score is calculated
    Editorial fit ×0.338
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Lindy a good StackAI alternative?

    Verified facts

    6 of 6 verified
    Free credits
    $50, no card required
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)
    Integrations
    1,500+ and MCP
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)
    Compliance
    SOC 2 Type II, GDPR, HIPAA
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)
    Credit top-ups
    $10 per 1,000 credits
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)
    Starting price
    $29.99 per user/month for 3,000 credits
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)
    Free trial
    $50 in credits for 7 days, no card required
    Checked Nov 8, 2026lindy.ai(opens source in a new tab)