Privacy-first
AI Chat Workspace BYOK, MCP tool & Chat Presets

Multi-Provider Support: Connect to any model via OpenAI/Anthropic-compatible APIs, including local models
Chat Presets: Save prompt, model, parameter, and tool as reusable presets. Switch between them with one tap to boost your workflow efficiency
MCP protocol support: MCP integration for third-party tool calling
Fine-tune Parameters: Shape every response with precise, flexible controls
Live Streaming: Real-time typewriter animation rendering with LaTeX formulas and Markdowns
Customize themes and colors: Set your theme and colors exactly the way you like

Download on the App Store Coming soon Mac App Store

New Chat

Chat Preset

Translator Research Daily Talk

Tap a preset to load model, prompt & tools

How to choose the best mortgage plan in the US in 2026 — fixed vs. variable?

Reasoning 0.5s

The right plan depends on how long I'll stay in the home. I'll pull today's rates from Freddie Mac, then run the amortization on a $500k loan to compare monthly payment and total interest for a 30-year fixed, 15-year fixed, and 5/1 ARM.

web_search 1.2s

{ "query": "current US mortgage rates August 2026", "max_results": 5 }

Freddie Mac PMMS · 30-yr 6.69% · 15-yr 6.01% · ARM 6.51%

Plan	Rate	Payment	Interest
30-yr fixed	6.69%	$3,223	$660k
15-yr fixed	6.01%	$4,222	$260k
5/1 ARM	6.51%	$3,163	$639k

Monthly payment on a $500k loan:

M = P·r(1+r)ⁿ / ((1+r)ⁿ − 1)

Amortization in Python:

Daily Talk ▸ Ollama · Qwen3.6-35B-A3B

10:24

↓ 19 ↑ 240 43.1 tok/s 5.6 s

Type a message...

Chat Presets · Live streaming · LaTeX · Tables · Code

Chat Preset

One tap, a different expert.

Stop re-entering the same settings for every task. Chat Presets are reusable prompt templates — model, system prompt, parameters, and tools in one tap.

Model · prompt · params · tools, saved once
Switch Translator to Research in one tap
Prompt variables resolved at send time

Chat Preset 1 Tap Tap to try

Presets

Prompt "Act as a research analyst. Cite sources and flag uncertainty."

Variables {{current_date}} → 2026-08-13

Model gpt-4o

Temperature 0.4

Tools web_search fetch

Model · prompt · params · tools + New Preset

MCP Tools

Plug your AI into the real world.

MCP servers give the model real capabilities mid-answer.

Any MCP server — or your own
Bearer token & custom headers
Validate, then auto-discover tools

MCP JSON-RPC

Server Details

Name web-tools

URL https://tools.local/mcp Example

Transport Streamable HTTP · SSE

Authentication

Type Bearer Token

Bearer Token ••••••••••••••••

Connected to web-tools Fetched 3 tools · protocol 2026-07-28

Tools

web_search_exaExa · Neural web search

web_fetch_exaExa · Fetch as clean markdown

batch_searchAnySearch · Parallel queries

Who won the 2026 Fields Medal?

web_search_exa 2.4s

{
  "query": "2026 Fields Medal winners",
  "numResults": 3
}

{ "results": 3, "top": "Fields Medals 2026 — IMU", "url": "https://www.mathunion.org/imu-awards/fields-medal/fields-medals-2026" }

web_fetch_exa 1.6s

{
  "urls": [
    "https://www.mathunion.org/imu-awards/fields-medal/fields-medals-2026"
  ],
  "maxCharacters": 3000
}

{ "title": "Fields Medals 2026 — IMU", "excerpt": "Awarded to Yu Deng, John Pardon, Jacob Tsimerman and Hong Wang." }

Parameters

Fine-tune it all, in your own way.

Every knob your provider exposes, no config files.

Temperature · Top P · Top K · Min P · Max Tokens
Reasoning effort: Low / Medium / High
Penalties, seed, stop sequences — plus provider JSON

Session Parameters Fine control

Temperature 0.7

Top P 0.9

Max Tokens 2048

Reasoning Effort LowMediumHigh

Presence Penalty 0.2

Frequency Penalty 0.5

Stop Sequences </output>

Per session or preset Provider JSON

Appearance

Make it yours, native SwiftUI.

Theme, accent, and text size — app-wide.

Light · Dark · Auto
Nine accent colors, or any custom one
Three text sizes · native SwiftUI

Appearance Settings Tap to try

Mode

Accent

Font size

Pricing

Free to try. Pro for life.

Free

$0

Free for everyday chat

30 trial messages, then 50 / month
1 AI provider
Bring your own API key
On-device chats & Keychain
Streaming Markdown, LaTeX & code
Themes & basic parameters
Built-in prompt templates

Get Free

Lifetime

Pro

$14.99

One-time purchase · No subscription

Everything in Free, plus:
Unlimited messages & providers
Chat Presets
MCP tools
Custom prompt templates
Advanced parameters
Bulk export history

Unlock in the App Store

Compare

How BayesChat compares

An honest look at the alternatives — each is good at what it does. Here's where the differences are.

Feature comparison between BayesChat, Chatbox AI, OpenCat, and Geeps
Feature	BayesChat	Chatbox AI	OpenCat	Geeps
Reusable Chat Preset	BayesChatYes — save model, prompt, parameters & tools; switch in one tap	Chatbox AINo	OpenCatNo	GeepsPartial — prompt library only
Prompt variables	BayesChatYes — date, time & model variables with cache-friendly hints	Chatbox AINo	OpenCatNo	GeepsNo
Auto Summarize Title	BayesChatYes — every chat named automatically, with live animation	Chatbox AINo	OpenCatNo	GeepsNo
Theme presets	BayesChatYes — Sepia, Solarized, Nord, Rosé Pine, Gruvbox & more	Chatbox AINo	OpenCatNo	GeepsYes — custom accent, background & text
Styled export & share	BayesChatYes — PDF, HTML & Markdown with math, code highlighting & theme; batch ZIP	Chatbox AINo	OpenCatPartial — raw text only	GeepsPartial — Markdown only
Backup & restore	BayesChatYes — one file backs up everything	Chatbox AINo	OpenCatPartial — iCloud sync only	GeepsPartial — iCloud sync only
Usage stats	BayesChatYes — tokens in/out, tok/s & duration per reply	Chatbox AIPartial — some stats	OpenCatNo	GeepsNo
Live rendering	BayesChatYes — streaming with LaTeX, tables & syntax-highlighted code	Chatbox AIYes — streaming Markdown	OpenCatPartial — math & tables incomplete	GeepsPartial — no math
MCP tools	BayesChatYes — any MCP server per chat with visible tool calls (Pro)	Chatbox AIPartial — hosted Pro/Pro+ plans only	OpenCatYes	GeepsNo — built-in web only
Fine-tuned parameters	BayesChatYes — temperature, penalties, stop sequences; saveable into presets	Chatbox AIPartial — small subset	OpenCatPartial — small subset	GeepsYes — per provider & chat
Native SwiftUI	BayesChatYes — built for iPhone & iPad	Chatbox AIPartial — cross-platform UI	OpenCatYes	GeepsYes
Desktop or web version	BayesChatPartial — Mac version coming soon	Chatbox AIYes — Windows, macOS, Linux & web	OpenCatYes — Mac + iPad	GeepsYes — Mac + iPad
On-device storage	BayesChatYes — Keychain keys, SwiftData chats, no account	Chatbox AIYes — local by default	OpenCatYes — iCloud optional	GeepsYes — iCloud optional
One-time purchase	BayesChatYes — Pro $14.99 once, lifetime, no subscription	Chatbox AINo — hosted plans from $3.99/mo	OpenCatNo — subscription for premium features	GeepsYes — $14.99 once + API use
Works without your own API key	BayesChatNo — bring your own API key	Chatbox AIYes — hosted plans bundle model access	OpenCatYes — cloud subscription available	GeepsNo — BYOK only

Yes Partial No

Positioning as of September 2026, from public app-store listings and vendor pages. Full write-up of BayesChat vs Chatbox AI, OpenCat, and Geeps: Read the BYOK client comparison →

FAQ

Common questions

What is an AI chat app with BYOK and MCP tools?

It's an AI chat app where you bring your own key (BYOK) to connect any provider — OpenAI, Anthropic, Gemini, DeepSeek, or local models — and enable MCP servers so the assistant can act as an agent with tools like web search and fetch. Chat Presets let you switch model, prompt, and tools in one tap.

Do you store my chats or API keys?

No. API keys stay in Apple Keychain. Conversations stay on your device. BayesChat has no account system and no cloud that receives your chats.

What does BYOK mean?

Bring your own key. You connect providers with your own API key and pay them directly. We do not resell tokens or sit in the middle of your requests.

Which devices and providers are supported?

Available now on iPhone and iPad; Mac is coming soon. Use OpenAI, Anthropic, Gemini, OpenRouter, DeepSeek, Mistral, LM Studio, Ollama, or any OpenAI-compatible endpoint with a custom URL.

Is Pro a subscription?

No. BayesChat is free to download. Pro is a one-time $14.99 in-app purchase with lifetime access — no subscription.

What is included in Free vs Pro?

Free includes BYOK, on-device storage, streaming Markdown/LaTeX, themes, and basic parameters, with message and provider limits. Pro ($14.99, one time) unlocks unlimited messages and providers, Chat Presets, MCP tools, custom prompts, advanced parameters, and bulk export.

Do I need to create an account to use BayesChat?

No. There is no account system — just add your provider and API key and start chatting. Your chats stay on your device, so nothing is tied to your identity.

Can I import or export my chat history?

Yes. You can export conversation history for backups or sharing. History is stored locally on your device via SwiftData.

Is there an Android or Windows version?

Not yet. BayesChat currently supports iPhone and iPad; Mac is coming soon. We focus on Apple platforms first and may expand to other platforms later.

Can I get started without any technical setup?

Yes. Just add a provider, paste your API key, pick a model, and send a message. For a local model such as Ollama, set its custom base URL and tap Verify.

What is MCP?

Model Context Protocol. You can add MCP servers so the model can use external tools such as web search, fetch, or your own JSON-RPC tools — enabled per chat.

Contact Us

Questions or feedback?

Email us about bugs, feature requests, or anything else. We read every message.

bayeschat@gmail.com Join Discord Follow us on X

Privacy-first AI Chat Workspace BYOK, MCP tool & Chat Presets