SumizAI vs AppFlowy

What AppFlowy is

What AppFlowy is

AppFlowy is an open-source, openly declared alternative to Notion, built around giving users full control over their own data. The app combines documents, databases, kanban boards, calendars, and a wiki in one tool, running natively on macOS, Windows, Linux, iOS, and Android from a single shared codebase.

Key features

The architecture relies on Flutter for a cross-platform, native interface and Rust for a fast, memory-safe backend handling application logic — that combination translates into a fast app start and near-instant page loading, even with large databases. Full offline mode lets you work without an internet connection and sync changes once it's back. AI integration with configurable language model providers adds writing assistance without sending data to one vendor-imposed cloud.

Data ownership as a founding principle

Users have full (100%) control over their data — AppFlowy can be self-hosted on your own servers, setting it apart from Notion, where data always lands on the company's infrastructure. Open source code under the AGPL-3.0 licence also lets you modify the app itself to fit your own workflow.

Who it's for

AppFlowy appeals to individuals and teams who value Notion's flexibility — documents, databases, kanban boards in one place — but don't want to hand their data to a third-party company or be dependent on its business decisions about pricing or service availability.

Use cases

In practice, AppFlowy works well for building an internal team wiki on your own server, managing projects through kanban boards and relational databases, and migrating away from Notion for organizations with data-location compliance requirements.

Pricing and business model

AppFlowy runs on freemium — the open-source, self-hosted version is entirely free, and the company also offers a paid cloud version for people who'd rather not manage their own server infrastructure.

Limitations and what to watch for

Self-hosting means taking on responsibility for backups, updates, and server security yourself — for teams without a dedicated IT department, that can be a meaningful extra operational cost compared to a ready-made cloud service.

AI plugins with a configurable provider

Rather than locking users into one built-in model, AppFlowy lets you configure your own language model provider for AI-assisted writing features — meaning data sent to the model goes exactly where the user decides, not to a default, vendor-imposed external service.

Databases as the heart of the workspace

Beyond plain documents, AppFlowy offers relational databases with configurable fields, filters, and views — a feature especially valuable for teams managing structured data, like task lists with assigned people, deadlines, and priorities, rather than just loose text.

A community of ready-to-use templates

AppFlowy users share ready-made workspace templates — from trip planning to project management — letting new users start right away with a sensible structure instead of building everything from scratch after the first login.

AI notes in AppFlowy's database

AppFlowy has no built-in integration with chat models beyond its own writing assistant, but a fragment of a conversation with an external AI model can be pasted as a document or database entry and connected to other elements in the workspace — for anyone building an archive of ai notes in a Notion-like environment, that's a natural extension of the existing structure, though it requires a manual pasting step.

Comparison with the original Notion

The main difference from Notion isn't in features — both apps offer a similar set of documents, databases, and views — but in who controls the infrastructure holding the data, which matters when assessing the business risk of depending on a single cloud vendor.

What's worth checking before choosing

Before settling on AppFlowy, check whether you'd rather self-host with full control or pay for the company's cloud version, and test migrating your existing Notion base to gauge how much manual work the move requires.

One codebase, many platforms

Thanks to Flutter, the same interface code ships to desktop, phone, and tablet with no separate versions maintained in parallel by the team — for users that means a consistent experience regardless of device, and for the developers, faster rollout of new features across every platform at once instead of one at a time.

Community around the open code

AppFlowy is developed by an active community of contributors submitting fixes and new features directly to the GitHub repository — for an organization with its own technical team, that opens the door to shipping custom modifications without waiting for the official roadmap from the company behind the project.

Migrating from Notion step by step

Moving an existing base from Notion to AppFlowy requires exporting the source data and importing it in the new format — the process tends to be smooth for simple documents, but more complex databases with elaborate relations and formulas may need manual cleanup after migration before everything works exactly as it did before.

A trade-off between control and convenience

Choosing between self-hosting and AppFlowy's paid cloud is, in practice, a choice between maximum control (and responsibility) and the convenience of a ready-made service — there's no single right answer, only a trade-off that depends on a team's technical resources and how much weight it puts on independence from an outside vendor.

Bottom line

AppFlowy is an open-source, self-hostable alternative to Notion with native performance thanks to Flutter and Rust. Anyone who wants ai notes from AI conversations to land automatically as plain files without having to build their own database structure should consider a tool built around that workflow.

Comparison with SumizAI

AppFlowy and SumizAI differ in model and content source. AppFlowy is a flexible, self-hostable platform for hand-written documents and databases, with optional AI writing assistance. SumizAI generates ai notes automatically from a conversation with an AI model connected through your own API key to one of seven providers, saving them as Markdown files in a folder you own. Anyone who wants a full-featured workspace platform with databases and kanban boards will pick AppFlowy; anyone who wants ai notes to arise directly from an AI conversation without building the structure themselves will find SumizAI the better-fitting tool.

That is our reading of the record. For AlternativeTo's own wording, see its page for AppFlowy — the facts above were read on 2026-08-16.

AppFlowy in depth

The open source answer to Notion, and how far it has got

AppFlowy is a workspace application that puts documents, databases, kanban boards, calendars and team wikis in one place, and it is the most prominent open source attempt to occupy the ground Notion holds. The repository has been public since 16 June 2021 and has accumulated roughly 75,700 stars and 5,900 forks, which places it among the most starred productivity projects on GitHub. Release 0.13.2 landed on 11 August 2026, and the project ships builds for Android, Linux as AppImage, deb, rpm and tarball, and macOS in arm64, x86_64 and universal variants, alongside distribution through Google Play, the App Store, Snapcraft and Flathub.

Technically it is an unusual combination: the interface is written in Flutter, so one Dart codebase produces desktop and mobile clients, while the data layer is Rust. That pairing is the reason the same application runs on five platforms with a consistent feature set, and it is also why the editor sometimes feels subtly unlike a native application on any of them. The company behind it, AppFlowy.IO, is based in Singapore, and the licence is AGPL-3.0.

Data ownership is the actual product

The argument AppFlowy makes is not that it has features Notion lacks. It is that your content stays under your control. The application works offline, storing data locally, and synchronises when you choose to connect. You can run the whole backend yourself, and the code is available for inspection under a copyleft licence, so the promise is verifiable rather than merely stated. There is no advertising and no tracking, and the catalogue records the project as privacy focused, lightweight and customisable through themes, plugins and templates.

That combination answers the specific fear that drives people away from hosted workspaces: that years of team documentation live inside a service whose pricing, terms or existence can change without your consent. It is worth being precise, though. Self-hosting AppFlowy means operating a server stack, not copying files to a folder, and the free self-hosted tier the vendor publishes is limited to a single user seat with three guest editors, so a team that self-hosts still enters a commercial arrangement. One reviewer put a figure on it, reporting a cost of around 60 dollars a month for six users, and complained about exactly that gap between the open source promise and the licensing of team and on-premise use. Anyone choosing AppFlowy specifically to escape per-seat pricing should read the terms for the self-hosted edition before committing a team to it.

What the cloud plans cost

The hosted tiers are straightforward. The free plan gives one collaborative workspace with up to two members, unlimited pages and blocks, 5 GB of storage, intelligent search, real-time collaboration, the mobile app, and a small AI allowance of ten responses and two images. Pro costs 12.50 dollars per user per month billed monthly, or 10 dollars per user per month billed annually, which works out at 120 dollars per user per year. It removes the storage cap, allows up to 50 workspace members and 100 guest editors, gives unlimited AI responses and 50 AI images a month, unlimited file uploads and a custom namespace. Guest editors are not charged.

Two add-ons sit beside that. AI MAX costs 8 dollars per user per month and opens access to stronger third-party models, with GPT-5, Gemini 2.5 Pro and Claude 3.7 Sonnet named on the pricing page. Vault Workspace costs 6 dollars per user per month billed annually and does the opposite: it runs AI locally on your own hardware with no data transfer, offering unlimited responses and no file size limit for AI chat. That local option is the more interesting one, because it lets an organisation use assistant features on confidential material without shipping it to a model vendor.

The billing mechanics are worth knowing because they surprise people. Plans attach to a workspace, not to an account, so you can hold two Pro workspaces and three free ones at once and pay for each separately. Adding a member charges a prorated amount for the remainder of the cycle; removing one produces no refund, though the seat stays available for someone else until the period ends. Cancelling drops the workspace to Free immediately, and anything above the free limits may then be restricted, which for a team that has passed 5 GB is a consequence to plan for rather than discover.

Day-to-day capabilities

Content is organised as pages built from blocks, with WYSIWYG editing, Markdown support, code blocks with syntax highlighting and dark mode. Structured data is handled through grid, kanban and calendar views over the same records, which is the model Notion popularised. Project work is supported with subtasks, mentions of colleagues, recurring tasks and time tracking against tasks. Templates and themes cover customisation, and Zapier provides the bridge to outside services. AI features are integrated into the editor for brainstorming, drafting, summarising, expanding or shortening text, filling database columns automatically and answering questions about your own content, and administrators can switch the AI off from an admin panel, which matters in organisations where that is a policy question rather than a preference.

What users actually complain about

Reception is broadly positive but not uncritical. The catalogue records 212 likes, 13 comments and an average of 4.1 out of 5 from 19 ratings, with the mobile app scoring around 4.26. A five-star reviewer described it as having the potential to become the successor to Notion, and others praised its speed and the seriousness of its privacy stance.

The criticisms are specific and consistent enough to take seriously. The editor is the most common target: missing conveniences such as hashtags, keyboard shortcuts that do not match what people expect from other editors, and assorted interface bugs. Online mode has been described as laggy, and imports depend on the server, which makes migrating an existing Notion workspace less smooth than it should be. Then there is the licensing complaint described above, which is the sharpest of them, because it touches the reason many users chose the project in the first place. With 999 issues open on GitHub, the maintainers are clearly aware there is a long queue.

Who should adopt it

AppFlowy suits a team or individual who wants a Notion-shaped workspace without handing their documentation to a service they cannot leave, and who is comfortable with software that is still visibly evolving at version 0.13. The offline-first behaviour and the local AI option are genuine differentiators, and the breadth of platform coverage, with real desktop and mobile clients rather than a wrapped web page, is unusual for an open source project of this kind.

It is less suitable for anyone who needs a polished editor today, who relies on a large ecosystem of third-party integrations, or who wants a self-hosted deployment for a team without paying commercial terms. Interface localisation is also limited, with English recorded as the supported language in the catalogue. Practical advice: try the free workspace with real documents, test the import path from whatever you use now before committing, and read the self-hosting licence carefully if that is your reason for choosing it. When you compare workspace tools, the questions that separate them are whether your data can leave with you, what the assistant does with your content, and how the price scales as the team grows. SumizAI can be measured on the same three axes.

Product page: appflowy.com

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's description of AppFlowy 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.
• AppFlowy is open source (AGPL-3.0), and SumizAI is not. If reading the source is what decides it for you, that is a real argument for AppFlowy. 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.
• AppFlowy is freemium: there is a free tier and a paid one, and the line between them is the thing to read before committing. SumizAI has one plan at a dollar a month, so there is no feature held back for a higher tier — and an unpaid account still opens and exports every vault it already has.
• AlternativeTo's description of AppFlowy 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.
• AppFlowy is described as something more than one person uses at once. SumizAI is not: there are no shared vaults, no comments, no permissions and no sync between devices. If the work is a team's, that is a reason to pick AppFlowy over SumizAI.
• AppFlowy can be self-hosted. SumizAI has nothing to host on the desktop — the vault is a folder on your machine — and if you want the model on your own hardware too, a local Ollama is one of the seven providers it speaks to.
• AppFlowy is extensible through plugins. SumizAI is not, and that is a genuine trade: you cannot bend it into something else, but there is also no plugin to keep working after the next release. What it does instead is fixed and small — a chat, a filing rule and a folder of Markdown.

Which one to pick