6 free tools to develop apps with AI
AI coding assistants and app builders are everywhere, and so are their subscriptions. Between Cursor, Claude, Copilot, and cloud agent platforms, it is easy to spend more on AI tooling than on hosting the app itself.
You do not have to. The open-source ecosystem now covers the full stack: run models on your machine, write code with local agents, ship RAG apps, fine-tune models, and automate workflows, without locking yourself into another monthly charge.
Here are six free tools from the NoSubscription catalog that help you develop apps with AI on your own terms.
1. Ollama: local models, simple API
Before you build anything with AI, you need a model you control. Ollama runs large language models on your own computer with a lightweight CLI, desktop app, and OpenAI-compatible API. Pull Llama, Mistral, Gemma, DeepSeek, and more, then point your app or coding agent at localhost.
No cloud round-trips for every prompt. No surprise token bills. Just a local runtime you can wire into scripts, editors, and agents.
2. OpenCode: open-source AI coding agent
OpenCode is an open-source coding agent you can use from the terminal, IDE, or desktop. Connect any model from any provider (including local models via Ollama) and let the agent write, edit, and reason about your codebase.
If you have been paying for Claude Code or similar closed agents, OpenCode is the subscription-free path: same workflow idea, models you choose, code that stays under your control.
3. OpenHands: build and scale coding agents
When one agent is not enough, OpenHands gives you an SDK, CLI, and GUI to define coding agents in Python and run them locally or in the cloud. It is built for teams and power users who want to create agents, collaborate, and scale beyond a single chat window.
Use it to automate refactors, generate tests, or run multi-step engineering tasks, without renting a proprietary agent platform by the month.
4. Dify: ship LLM apps, not just chat demos
Writing code with AI is one thing. Shipping an AI product is another. Dify is an open-source platform for LLM applications: visual workflows, RAG pipelines, agents, model management, and observability so you can go from prototype to production without stitching five SaaS products together.
Self-host it, plug in your preferred models, and build assistants, knowledge bots, or internal tools you actually own.
5. Goose: automate the engineering grind
Goose is an on-machine, extensible AI agent aimed at real engineering work: scaffolding projects, writing and running code, debugging failures, and talking to external APIs. Think of it as a free alternative mindset to cloud “AI software engineers” that charge per seat.
It lives on your machine, so your repo and secrets do not have to leave your environment just to get help with a tedious task.
6. Unsloth: fine-tune models without the GPU bill shock
Sometimes the best model for your app is not a generic chat model: it is one trained on your domain. Unsloth is an open-source toolkit for training and running LLMs and multimodal models locally, with optimized fine-tuning (including LoRA), lower memory use, and a desktop interface.
Skip the opaque fine-tuning SaaS. Tune on hardware you control, then serve the result through Ollama or your own stack.
How to combine them
A practical free stack looks like this:
- Ollama (or LM Studio) hosts the models.
- OpenCode or Goose helps you write the app.
- Dify turns those models into a product with RAG and workflows.
- Unsloth customizes a model when generic prompts are not enough.
- OpenHands scales agent workflows when you outgrow a single assistant.
Add n8n later if you need self-hosted automation between your AI app and the rest of your tools. It has a free self-host option and strong AI nodes.
Conclusion
You can build serious AI apps without renting every piece of the stack. Start with a local model runtime, pick an open coding agent, and ship the product layer with something like Dify. Your data stays closer to home, your costs stay predictable, and when a vendor changes pricing overnight, your toolchain still belongs to you.
Browse more AI and development tools in the NoSubscription catalog: free, freemium, and one-time options only.