SumizAI vs Local Chat

What Local Chat is

What Local Chat is

Local Chat allows you to run the latest open language models on your Mac, iPad, and iPhone. Once you've downloaded the models, you can use the chat function even when your device is offline. Your chats remain totally private, since no internet connection is required to hold them. This tool's Spanish origin places it among European AI projects especially attuned to data privacy concerns, in keeping with the spirit of GDPR regulations in force across the European Union.

A freemium model lets people try core functionality for free, while a paid subscription presumably unlocks access to more models or additional features. Availability across the entire Apple ecosystem — Mac, iPad, and iPhone — means Local Chat follows a user regardless of which device they're currently working on, while maintaining the same guarantee of full privacy on each.

The ability to use chat in offline mode is a fundamental advantage of Local Chat over cloud-based AI assistants — a user traveling by plane, working somewhere without internet access, or simply wanting to avoid any data transmission whatsoever can keep working with the language model without any limitations arising from a lack of network connectivity.

Someone working with sensitive professional data, using Local Chat precisely for its guarantee of full privacy and offline capability, over time holds many conversations with the local model about delicate professional topics. Even though the conversations themselves stay locally on the device, a user may want to extract the key takeaways from them in a form easier to review than scrolling through a long chat history on a small phone screen.

SumizAI complements Local Chat exactly at that point: key takeaways from conversations held with the local model in Local Chat can be saved as ai notes in a local Markdown file, preserving the same philosophy of full privacy and zero cloud dependency at every stage. Someone working offline for most of the day ends up with ai notes instantly available to review, with no need to scroll through a long conversation history on a mobile device.

These tools complement each other: Local Chat delivers a fully private, offline-capable conversation with open language models on Apple devices, while SumizAI ensures the key takeaways from those conversations survive as ai notes stored locally, fully consistent with the privacy philosophy that led the user to choose Local Chat in the first place.

Someone who travels by plane frequently, using long internet-free flights for intensive work with the local model in Local Chat, will especially appreciate keeping these notes as a way of organizing the conclusions from such a session before landing, while memory of the conversation's details is still fresh. After landing and regaining internet access, such a previously prepared these notes becomes a ready starting point for further work, instead of having to recall from scratch what was actually established during the flight. Frequent flyers on long intercontinental routes are often surprised how much valuable work can get done offline by combining Local Chat with the discipline of keeping these notes directly during the flight, instead of postponing all analytical work until after landing.

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

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

• Local Chat 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 .md file with a title, a place in base.md and a duplicate check against the notes already in the vault. If you only want to talk to a model, you do not need SumizAI.
• AlternativeTo's description of Local Chat 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.
• Local Chat 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 Local Chat 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.
• Both are run from the EU: SumizAI's operator is registered in Poland and the servers are in Germany.

Which one to pick