Agents & workflow automation
Best AI workflow builders in 2026: 4 tools compared
4 tools · Updated Sep 6, 2026
Two different jobs hide under one label here. One is connecting things: when a form is submitted, add a row, notify a channel, call a model, retry on failure. That is a workflow, and n8n and Activepieces are built for it. The other is answering questions from material you own — upload your documents and let a model reply from those rather than from whatever it absorbed in training. That is what Dify's knowledge base does, and what Langflow's canvas helps you assemble. Plenty of people arrive wanting the second and start building the first, or the reverse, so it is worth deciding which one you are doing before you pick. The other thing to know before choosing is that "open source" means three different things across these four tools. Activepieces and Langflow are MIT-licensed — permissive, with no branding or use restrictions attached. Dify's licence is Apache-2.0 with two additions: no multi-tenant SaaS built from the source without written authorisation, and its logo and copyright notice have to stay. n8n does not claim the label at all — its self-hosted edition is under the Sustainable Use License, which allows internal and personal use and no reselling. If you plan to run any of these inside a product you charge for, read the licence before you read the pricing page.
Side by side
| Tool | Best for | Free tier | From |
|---|---|---|---|
| Dify | Teams that want a chatbot answering from their own documents without assembling a retrieval pipeline by hand. | $0 on Sandbox: 200 message credits, one workspace, one member, five apps and 50 knowledge documents. | from $590/year |
| Activepieces | Small teams replacing Zapier who want the option to move the whole thing onto their own servers. | $0 forever with no card: 100 credits a day, one user and an unlimited number of flows. | from $16/month |
| Langflow | Technical teams prototyping retrieval and agent pipelines visually before committing them to code. | Everything is free; you pay for the server you run it on and for your model provider's tokens. | Free |
| n8n | Technical teams that need complex branching logic and expressions rather than a straight line of steps. | The self-hosted Community Edition is free. The cloud free trial gives 1,000 executions, five concurrent, a 180-second timeout and 800 AI Assistant credits. | from $24/month |
How we picked
Four criteria. Each tool is free to start: Dify's Sandbox and Activepieces' free plan are hosted and cost nothing, Langflow is free to self-host, and n8n has a cloud free trial and a free self-hosted Community Edition. Each can run on your own infrastructure. Each publishes what it is licensed under, which in this category turns out to matter more often than price does. And each is active rather than abandoned: Dify at 154,653 GitHub stars and a $30M Series Pre-A at a $180M valuation in March 2026, n8n at 203,568 stars and a $5.2B valuation after SAP's strategic investment in May 2026, Langflow at 154,354 stars with v1.12.0 on 1 September 2026, and Activepieces at 24,298 stars and 4.8 out of 5 on G2. Prices come from each vendor's own pricing page, read on 6 September 2026 — except Langflow, which has no working pricing page and no paid plan to put on one. We have not tested them hands-on.
The tools
Dify
from $590/yearBuild chatbots and agent workflows over your own documents. The free Sandbox gives 200 message credits, five apps and 50 knowledge documents.
Activepieces
from $16/monthAn MIT-licensed, self-hostable Zapier alternative. The free plan gives 100 credits a day, one user and unlimited flows, with no card required.
Langflow
FreeA free, MIT-licensed canvas for wiring models, prompts and data into agents. Self-host only: the hosted cloud shut down in April 2026.
n8n
from $24/monthA visual automation builder for apps and AI models. Cloud starts at $24 a month; the free self-hosted edition is source-available, not open source.
Which one should you start with?
Start with Activepieces if you want a Zapier-style automation. The free plan is 100 credits a day with no card, the licence is MIT, and of the four it is the one pitched at non-technical users who just want two apps talking to each other. Start with Dify instead if you want a chatbot over your own documents: the free Sandbox gives 200 message credits, five apps and 50 knowledge documents, which is enough to find out whether the answers are any good before you spend money. Come to n8n when a flow needs the nested branching that Activepieces' linear architecture limits — and read its licence first. Leave Langflow until you are comfortable running your own server, because since April 2026 that is the only way to run it at all.
Questions people actually ask
- What is the difference between an agent and a workflow?
- A workflow is a path you draw in advance: this trigger, then these steps, branching where you said it should branch. It runs the same way every time. An agent is handed tools and a goal and picks the order itself, which is more flexible and harder to predict. The difference bites hardest when something breaks: with a workflow you can point at the step, and with an agent you are reading a transcript. Every tool here builds workflows, and Dify, Langflow and Activepieces each describe agent building as part of what they do.
- Is n8n open source?
- No. Self-hosted n8n is under the Sustainable Use License, and n8n's own documentation says that because OSI open-source licences cannot include limitations on use, it does not call itself open source. You may run it for internal or personal use. You may not resell it as a hosted service. Files with ".ee" in the name need a separate Enterprise licence. Activepieces and Langflow are MIT-licensed, with no such conditions.
- Which of these is genuinely open source?
- Activepieces and Langflow, both MIT. Dify's licence is Apache-2.0 plus two restrictions — no multi-tenant SaaS built from the source without written authorisation, and the logo and copyright notice must stay — which is why its "open source" description has drawn pushback on GitHub and Hacker News. n8n does not claim the label.
- What can I do without paying?
- A fair amount. Dify's Sandbox is 200 message credits, one workspace, one member, five apps and 50 knowledge documents. Activepieces gives 100 credits a day, one user and unlimited flows, with no card. Langflow is free outright, since self-hosting is the only way to run it. n8n has a cloud free trial and a free self-hosted Community Edition. What neither hosted free plan here includes is SSO: Activepieces lists it on Team ($166 a month billed yearly) and n8n from Business (€800 a month, or €667 billed annually).
- Can I self-host all four?
- Yes, but read three different licences first. Langflow and Activepieces are MIT. Dify's Community edition is free to run but forbids offering a multi-tenant SaaS built from the source without written authorisation. n8n's Community Edition is free to run under the Sustainable Use License, for internal and personal use only. Self-hosting n8n needs Docker, Postgres and Redis, and self-hosted Langflow does not carry the SOC 2 Type II compliance its discontinued cloud had.
Research-compiled, not hands-on tested. Compiled from official docs, the vendor's pricing page and community reviews as of Sep 6, 2026. We haven't tested it hands-on yet.