What Stable Assistant is
AlternativeTo files Stable Assistant under AI Chatbot, AI Image Generator. It is recorded as Paid, Proprietary, from United Kingdom. It ships on Online. The topics its entry raises are chat and image generation.
That is our reading of the record. For AlternativeTo's own wording, see its page for Stable Assistant — the facts above were read on 2026-08-16.
| Price | Paid |
|---|---|
| Licence | Proprietary |
| Category | AI Chatbot, AI Image Generator |
| Origin | United Kingdom |
| 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 | Stable Assistant |
|---|---|---|
| Price | $1/month, one plan, 7-day trial without a card | Paid |
| Licence | Proprietary | Proprietary |
| Platforms | macOS, Windows, iOS, Android | Online |
| Category | Note-taking — AI chat into Markdown | AI Chatbot, AI Image Generator |
| Where notes live | Standard .md files in a folder you choose | AlternativeTo does not say |
| AI model | Seven providers, always on your own API key | Its description mentions AI |
| Origin | Poland, EU | United Kingdom |
Where they differ
- Stable Assistant is a place to have the conversation. SumizAI is not a chatbot — the conversation is the input, not the product. What comes out of it is a
.mdfile with a title, a place inbase.mdand a duplicate check against the notes already in the vault. If you only want to talk to a model, you do not need SumizAI. - Stable Assistant is paid software. Compare the two numbers directly: SumizAI is one dollar a month, one plan, and your AI provider bills you separately for the model you chose.
- AlternativeTo's description of Stable Assistant does not mention Markdown, so check what format your notes end up in before you fill it up. SumizAI writes standard
.mdfiles to a folder you picked, and an unpaid account can still export all of them. - Stable Assistant 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.
- Stable Assistant generates images. SumizAI does not — it writes text notes, and exports them as PDF or a PowerPoint deck.
Which one to pick
Reasons to pick Stable Assistant
- 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 Stable Assistant: AlternativeTo, read 2026-08-16. SumizAI is not affiliated with Stable Assistant, and the name is used only to identify the product being compared.
Taken from the AlternativeTo lists: ChatGPT.