Comparison
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Kiln | not listed | yes | Website & app builders |
 Evaligo | 7 USD/mo | yes | Website & app builders |
 LangChain | 39 USD/mo | yes | Website & app builders |
 Gemini Enterprise Agent Platform | 0,75 USD | ? | Website & app builders |
 GlideOS | 25 USD/mo | yes | Website & app builders |
 Mastra | 250 USD/mo | yes | Website & app builders |
 Pipedream | 99 USD/mo | yes | Website & app builders |
 Langflow | not listed | yes | Website & app builders |
 Bubble | 29 USD/mo | yes | Website & app builders |
Each alternative in short
1. Evaligo
Visual drag-and-drop builder for AI workflows with built-in A/B testing across models, blind AI judging, and API deployment.
Yes, there is a free plan. 500 credits per month, full visual workflow builder, 20+ AI models, web scraping, integrations, API deployment, built-in A/B testing, one-time scheduled runs, unlimited use of your own API keys.
2. LangChain
Open agent engineering platform for building, testing, deploying and monitoring AI agents, aimed at engineering teams.
Yes, there is a free plan. Developer plan: free, 1 seat, up to 5k base traces per month, then pay-as-you-go, community support. Open source frameworks are free to use.
3. Gemini Enterprise Agent Platform
Google Cloud platform for developers to build, scale, govern and optimize AI agents on Gemini models.
The vendor does not state this clearly on the homepage or pricing page.
4. GlideOS
AI platform that builds internal business apps and agents from a spreadsheet or a prompt, for operators and teams without deep coding skills.
Yes, there is a free plan. Free plan with limited credits, 2 team members, 10 projects, and integrations; no published apps or enabled workflows.
5. Mastra
Open-source TypeScript framework for building, observing and deploying AI agents, workflows and tools, from prototype to production.
Yes, there is a free plan. Free open source framework (Apache 2.0) to build and host agents anywhere; Starter plan with 100K observability events, 24 CPU hours and 15-day data retention.
6. Pipedream
Managed integration layer that lets AI agents and apps call 10,000+ prebuilt tools and 3,000+ APIs with per-user auth handled for them.
Yes, there is a free plan. Free plan: full access to build and test in development, all features, 3,000+ connectors, unlimited team members, community support. Production use requires Startup.
7. Langflow
Low-code builder for AI agents, RAG apps and MCP servers, with visual flows you can extend in Python.
Yes, there is a free plan. Get Started for Free; a free cloud account is offered for deployment. Open source version available on GitHub.
8. Bubble
No-code platform for building web and mobile apps, with AI prompting and visual editing, for founders, agencies and teams.
Yes, there is a free plan. Build any app for free in the development version; upgrading to Starter is needed to launch a live website and custom domain.
FAQ
What is the best alternative to Kiln?
The most popular option in the same category is Evaligo. See the comparison table above.