Sarion: an AI assistant for managing tasks and notes naturally

In the last month, I’ve been working on a project I care a lot about: it’s called Sarion. It’s a web app designed with a clear goal — to simplify task and note management using an AI-powered assistant.

But not just any AI: a truly smart AI agent, designed to help you in your everyday life smoothly, naturally, and productively.

Why I created Sarion

Like many, over time I’ve tried out countless to-do apps. Beautiful and robust, but all designed for us humans, with interfaces that require time, clicks, and mental order.

With Sarion, I wanted to do something different: create a hybrid interface where you can both enter tasks directly, like in any traditional task manager, or talk to an AI agent that understands what you want to do.

The idea is that you can simply write:

“Remind me to pay the bill Monday morning and send the email to the accountant.”

And Sarion takes care of the rest: creates tasks, sets priorities, schedules reminders. No forms to fill out, no need to “think in app mode.”

My long-term goal is for Sarion to become your personal assistant, almost like a friend, to improve your life, get to know you, support you, and motivate you every day.

What Sarion does now, in a nutshell

• Manages to-do lists and notes, either through a manual editor or AI chat
• Uses a smart conversational assistant powered by Gemini 2.5
• Works on mobile and desktop, right from your browser
• Handles smart reminders, even if you don’t use chat

Everything is designed to adapt to your style: you can ignore the AI completely if you prefer to manage things manually, or you can delegate almost everything to the assistant.

A real AI agent, not just prompts

One thing I want to highlight is that Sarion isn’t just a skin over an AI model.

Behind the scenes is a real intelligent agent, built to reason based on context, use internal tools, break down complex activities into subtasks, and interact in a controlled and reliable way.

To achieve this, I built Sarion using Mastra AI, an AI orchestration framework entirely in JavaScript/Node.js. Sarion is one of the first concrete examples of how an AI agent can be integrated safely and responsively into a real-world web app.

I’ll discuss this in more detail in future articles — especially for those curious to see how it all works behind the scenes.

The user experience

The interface is simple, minimal, designed to stay out of your way.

On mobile, you have two tabs: one is the view of your tasks or notes, the other is the chat with the assistant.

On desktop, everything is at your fingertips, in a fast and clean UI, with shortcuts for those who love speed.

Every change you make is saved in real time, and every message you send to the AI is interpreted deterministically, with full control on your part.

The intelligence is there to support you, not get in your way.

Roadmap and next steps

Sarion is already up and running, but it’s constantly evolving.

I’m working on new features like:

• Adding folders for your projects
• Enhancing the agent’s capabilities
• Personal journal management
• Integration with your calendar

👉 If you’re interested in what’s coming, you can check the roadmap here.

Start using Sarion

Sarion is available online, free in the basic version.

You can create tasks, manage notes, and try out the AI assistant with a limited number of monthly tasks.

When you need more, you can move to the Pro plan, designed for those who want to use Sarion every day or in teams.

If you’re looking for a more natural and smarter way to manage your day, Sarion could really be for you.

👉 Try it free at getsarion.com

In future articles, I’ll dive deeper into how I built the AI agent, how Mastra AI works, and some of the technical challenges involved in building a robust conversational assistant for the web.

If you’re interested in agent-based AI, the LLM world, or you’re building something similar, stay tuned.