---
title: "SumizAI vs 21M Notes"
url: "https://sumizai.com/alternative-to/sumizai-alternative-to-21m-notes.html"
date: "2026-08-14T00:00:00+02:00"
modified: "2026-08-14T00:00:00+02:00"
description: "Looking for a 21M Notes alternative? SumizAI and 21M Notes side by side: price, licence, platforms and what each one actually does."
tags: ["ai notes", "sumizai", "21m-notes", "alternative to 21M Notes"]
---

# SumizAI vs 21M Notes

Looking for a 21M Notes alternative? SumizAI and 21M Notes side by side: price, licence, platforms and what each one actually does.

## What 21M Notes is

21M Notes is a Brazilian online app for organizing ideas, notes, and to-dos, built around splitting content into projects. Instead of keeping everything in one unsorted list, the user groups notes, saved prompts, links, and useful information by the specific project they belong to, making it easier to find the right content later. The app runs online only, with no dedicated desktop or mobile version.

Key features:

Organizing content by project lets users separate notes for one undertaking from an entirely different one, without mixing contexts in one shared list. Saving prompts as a distinct content category sets 21M Notes apart from classic notebooks — users can store proven AI model queries alongside plain text notes. Saving links together with context lets users build a library of useful resources tied to a specific project, instead of losing them among browser bookmarks. A simple, centralized interface keeps all these content types in one place, accessible from any browser.

Who it's for:

21M Notes appeals to people juggling several projects at once — freelancers, content creators, small business owners — who need a simple way to keep materials separate without an elaborate knowledge-management system. People who regularly use AI tools and want proven prompts on hand alongside notes for a given project will find a convenient combination of those two content types here. Free online access makes the app easily reachable for anyone without a financial barrier.

Use cases:

In practice, a freelancer serving several clients at once can create a separate project for each client, collecting meeting notes, links to reference material, and prompts used when generating content for that specific engagement. A content creator planning an article series can save topic ideas, useful sources, and proven prompts for generating drafts in one organized place. Someone learning a new skill can gather notes, links to courses, and questions to ask an AI model within a single educational project.

Pricing and business model:

21M Notes is completely free — there are no paid plans or hidden charges for extended features. That model, combined with the simple interface, suggests a tool maintained more as a niche, smaller project than a large business aimed at monetization, which for some users is an advantage (no subscription pressure) and for others a reason for caution about the service's long-term staying power.

Limitations and what to watch for:

Because the app runs online only with no official mobile app, offline access or a quick check from a phone without a browser aren't possible in the standard way. The free model with no clear funding source raises a question about the service's long-term stability — it's worth having a plan in case the app stops being developed or available in the future, for instance by regularly exporting important notes.

AI notes alongside regular notes:

21M Notes stands out for treating saved prompts as a full-fledged content category alongside regular notes — close to the idea of ai notes, saving valuable fragments of an interaction with an AI model as separate, organized entries. However, a user can save the prompt itself but not the model's answer — full ai notes from an entire exchange, question and answer together, require manually adding the answer text next to the saved prompt.

Simplicity as a deliberate choice:

Unlike elaborate knowledge-management systems with relationship graphs and advanced linking, 21M Notes deliberately sticks to a simple project split. That simplicity has a cost — no way to connect notes across different projects when a link between them emerges — but also a benefit: a new user understands the app's entire structure within minutes, without needing to learn a complex system before starting real work.

Brazilian origins and local context:

21M Notes originated in Brazil, visible in the simplicity and practical approach typical of smaller, independent projects built with a specific creator's needs in mind rather than scaling to a million users from day one. That kind of origin often means faster responsiveness to user suggestions, but also fewer resources for development compared to apps backed by large teams.

Managing a growing number of projects:

As the number of projects in 21M Notes grows, users develop their own naming conventions to quickly find the right project in the list — prefixes indicating project type (client, learning, personal), for instance, or start dates. That habit, though not enforced by the app itself, significantly eases the work once someone crosses a dozen or so active projects at once.

Risk of losing access:

Because 21M Notes offers no paid plan or clearly communicated maintenance model, users building an important project archive on it should treat it as a working tool rather than the sole place to store critical information. Regularly copying the most important notes and prompts into a separate, independent archive minimizes the risk of losing access to data should the service eventually stop working or change its access terms.

What's worth checking before choosing:

Before building out many projects in 21M Notes, it's worth checking whether the app offers a way to export data in case you switch tools later, and testing whether splitting content into projects fits the way you naturally organize your work.

Bottom line:

21M Notes is a simple, free way to organize notes, prompts, and links by project, without unnecessary complication. Anyone who wants full ai notes — question and answer together — saved automatically from a conversation with an AI model, instead of manually adding the answer text next to a saved prompt, should consider a tool built around that workflow.

Comparison with SumizAI:

21M Notes and SumizAI both organize content around projects, but they differ in where the material comes from. 21M Notes is a notebook the user fills by hand, including saving prompts for later use. SumizAI goes a step further — it turns an entire valuable exchange with an AI model, question and answer together, into a ready ai notes entry saved as a Markdown file in a vault the user owns. Anyone who wants a simple place for loose notes and prompts will pick 21M Notes; anyone who wants ai notes from full AI conversations to be created automatically without manual retyping will find SumizAI the better-fitting tool.

**Key facts**

- Price: Free
- License: Proprietary
- Origin: Brazil

## What SumizAI is

A note-taking application built around a conversation with an AI model. You ask a question, the answer streams back, and the answers worth keeping become Markdown notes — filed into a vault that is a folder on your own disk.

A vault is a directory holding `base.md`, a generated table of contents up to six levels deep, and a `notes/` folder with one `.md` file per note. Before a note is written it is checked against the ones already there, so the fourth note about the same idea gets merged instead of added. Links between notes are ordinary Markdown links to files that exist.

The model is never ours: you bring your own API key to one of seven providers — Anthropic, OpenAI, Gemini, Groq, OpenRouter, a local Ollama or your own server — and pay that provider directly. A question sends the table of contents plus at most five relevant notes within a 24,000-character budget, and the app shows you which five it used.

## Where they differ

- AlternativeTo's description of 21M Notes does not mention an AI model. That is the whole starting point in SumizAI: you have a conversation with a model on your own API key, and the answers worth keeping become notes without you filing them.
- 21M Notes is free and SumizAI costs a dollar a month after a seven-day trial that takes no card. A dollar is what it costs to run accounts and licences without reselling the model; if free is the requirement, 21M Notes wins that row outright.
- AlternativeTo's description of 21M Notes does not mention Markdown, so check what format your notes end up in before you fill it up. SumizAI writes standard `.md` files to a folder you picked, and an unpaid account can still export all of them.
- 21M Notes also does tasks. SumizAI does not — no boards, no due dates, no projects. It files knowledge, not work.
- 21M Notes runs in the browser. SumizAI is a desktop and mobile application, and on the desktop the vault is a folder on your own disk rather than a document in someone's cloud.

Full side-by-side comparison table and pricing: [https://sumizai.com/alternative-to/sumizai-alternative-to-21m-notes.html](https://sumizai.com/alternative-to/sumizai-alternative-to-21m-notes.html)