What OwnSpace is
AlternativeTo files OwnSpace under Note-taking. It is recorded as Free, Proprietary. It ships on Online. The topics its entry raises are Markdown, offline use, local files, privacy, sync and search.
That is our reading of the record. For AlternativeTo's own wording, see its page for OwnSpace — the facts above were read on 2026-08-16.
| Price | Free |
|---|---|
| Licence | Proprietary |
| Category | Note-taking |
| Origin | AlternativeTo does not say |
| Platforms | Online |
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.
Side by side
| Side by side | SumizAI | OwnSpace |
|---|---|---|
| Price | $1/month, one plan, 7-day trial without a card | Free |
| Licence | Proprietary | Proprietary |
| Platforms | macOS, Windows, iOS, Android | Online |
| Category | Note-taking — AI chat into Markdown | Note-taking |
| Where notes live | Standard .md files in a folder you choose | Its description mentions Markdown |
| AI model | Seven providers, always on your own API key | Its description does not mention AI |
| Origin | Poland, EU | AlternativeTo does not say |
Where they differ
- AlternativeTo's description of OwnSpace 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.
- OwnSpace 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, OwnSpace wins that row outright.
- Both keep Markdown, which makes moving between them mostly a matter of copying files. In SumizAI a vault is a directory holding
base.md— a generated table of contents — and anotes/folder with one.mdfile per note. - OwnSpace 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.
- Both search. SumizAI's search reads the whole note — title, summary, body and the original question and answer — rather than titles alone.
Which one to pick
Reasons to pick OwnSpace
- it costs nothing
- you need it to run in a browser
Reasons to pick SumizAI
- the notes you want already exist inside conversations with an AI model
- you want the filing — title, chapter, duplicate check — to happen without you
- you want the result as plain
.mdfiles in a folder you picked - you would rather pay your AI provider directly than have a note app resell the model
Facts about OwnSpace: AlternativeTo, read 2026-08-16. SumizAI is not affiliated with OwnSpace, and the name is used only to identify the product being compared.
Taken from the AlternativeTo lists: Obsidian.