SumizAI vs Noteup

What Noteup is

What Noteup is

Noteup is a free, open-source, GitHub-flavored Markdown note-taking app available on the web, on mobile as a progressive web app, and on desktop. Notes are saved locally in browser storage, but can be imported and exported, giving some flexibility despite the lack of a proprietary cloud. It's worth flagging right away that the project is marked as discontinued — the developer has stopped actively developing it, which carries real consequences for anyone considering it as a long-term tool.

Key features

GitHub-flavored Markdown syntax lets you write formatted text — headings, lists, bold text, code blocks — without leaving the keyboard and without the formatting menus typical of WYSIWYG editors. Availability across multiple platforms, from the browser to a progressive-web-app mobile version to a desktop build, offers theoretical flexibility about where you work. The MIT license and open source code let anyone inspect how the app works, or even develop or self-host their own copy, despite official development having stopped. Import and export of notes provides a way to migrate data to another tool, which matters especially given the project's discontinued status.

Who it's for

Noteup, despite no longer being actively developed, can still be useful for people looking for a simple, free Markdown editor without installing heavy software — developers already comfortable with Markdown syntax who want a quick tool for technical notes, or open source enthusiasts who value the ability to self-host and modify the code themselves.

Use cases

In practice, Noteup can be used to quickly jot down a fragment of technical documentation formatted in Markdown, ready to be pasted into a code repository later. Someone testing different Markdown editors before picking a final tool can use Noteup as a reference point, thanks to its open code being easy to inspect. A developer wanting to understand how to implement a simple Markdown editor in their own project can review Noteup's source code as a reference example.

Pricing and business model

Noteup is entirely free and open source, released under the MIT license, with no fees, subscriptions, or ads. Because the project is discontinued, there's no question of future pricing plans either — what's available now in the source code is the final state of official development, unless the community decides to pick up the project and continue it independently as a fork.

Limitations and what to watch for

The discontinued status is Noteup's most important limitation — no active development means no bug fixes, no new features, and potential future compatibility issues with newer browser versions. Notes saved locally in browser storage are vulnerable to loss if browser data gets cleared, so regular export is practically mandatory for anyone taking this tool seriously. The lack of a proprietary cloud also means no automatic sync between devices without manual export and import.

AI notes and discontinued-project status

Given that Noteup is no longer actively developed, building a long-term archive of ai notes from AI model conversations on top of it carries risk — without further updates, compatibility with future browser versions isn't guaranteed. Anyone still wanting to preserve an ai notes entry from a conversation with an assistant can paste it in using the app's native Markdown support, but it's worth planning for regular export of such ai notes into a more durable archive right from the start.

What's worth checking before choosing

Before building anything important on Noteup, check the date of the last source code update on GitHub, and test exporting your notes to make sure you always have a backup copy outside the app itself.

Bottom line

Noteup is a free, open source Markdown editor, still functional despite discontinued official development, but risky as the sole place for important long-term notes. Anyone who wants ai notes from AI conversations to land in an actively maintained, actively developed tool should consider an alternative with guaranteed continued support.

The fate of abandoned open source projects

Noteup isn't an isolated case — many small, single-developer open source projects end this way, when the creator runs out of time, motivation, or simply moves on to other interests, leaving behind working but unsupported code. For a user, that means having to assess the risk yourself: the app might keep working fine for years, but there's no guarantee a sudden browser change won't break something critical overnight, with nobody on the other end to fix it.

Educational value despite halted development

Even as a discontinued project, Noteup's source code retains educational value for people learning to build their own web apps — it shows a working implementation of a Markdown editor, browser local storage handling, and an import-export mechanism, without wrapping it in the extra layers of abstraction typical of large commercial projects.

When it's worth the risk, and when it isn't

The decision to use a discontinued project like Noteup largely comes down to how critical the data you're storing in it really is. For loose, temporary technical notes that will end up somewhere else eventually anyway, the risk is minimal. For notes meant to serve as a primary knowledge archive for years, relying on an unsupported tool with no guarantee of continued function is a risk most users should avoid, no matter how well the app happens to work today. A reasonable compromise is treating Noteup as a transitional tool, with regular exports to a format that will survive regardless of what happens to the app itself. Ultimately, the user bears full responsibility for the safety of their data, since there's no longer a development team to turn to if something goes wrong.

Comparison with SumizAI

Noteup and SumizAI differ above all in development status and content source. Noteup is a development-halted, manual Markdown editor with no AI integration. SumizAI is an actively developed tool generating ai notes directly from a conversation with an AI model — answers worth keeping land automatically as Markdown files in a vault the user owns. Anyone looking for a simple, free editor for manual notes and willing to accept the risk of no further support might consider Noteup; anyone who wants ai notes from AI conversations to be created automatically in an actively developed tool will find SumizAI the better-fitting option.

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.

Every answer kept this way becomes one of these ai notes, ready to search again months later without hunting back through old chats.

Side by side

Where they differ

• AlternativeTo flags Noteup as no longer developed. Whatever you put into it, you will eventually have to get back out — which is an argument for keeping notes in a format that outlives the application, and the reason SumizAI writes plain .md files into a folder you already own.
• AlternativeTo's description of Noteup 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.
• Noteup is open source (MIT), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for Noteup. The guarantee SumizAI offers instead is structural rather than legal: the notes are Markdown files in a folder you chose, so they open in any editor whether or not the application is running.
• AlternativeTo's description of Noteup 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.
• AlternativeTo lists no mobile version of Noteup. SumizAI runs on macOS, Windows, iOS and Android.
• Both export. SumizAI exports a whole vault as a PDF — summary or full detail — or as a .pptx deck in table-of-contents order, with fifteen slide themes.

Which one to pick