Arcus

Every frontier model.
One thread.

Linus SebarFounder

heyarcus.comLive on the App Store

Daytona Startup GridApplication, 2026

ArcusProblem

The problem

The best model changes every month. Your subscription doesn't.

ChatGPTOpenAI

$20/mo

ClaudeAnthropic

$20/mo

GeminiGoogle

$20/mo

GrokxAI

$30/mo

Four apps, four logins, four memories. Context, files and history are lost on every switch, so most people pick one lab and settle for a worse answer.

$90/mo

Entry-tier consumer plans, US pricing02

ArcusSolution

The solution

One thread. Every model.

Arcus puts GPT, Claude, Gemini and Grok in a single conversation, on one subscription.

01

Switch mid-conversation

The thread keeps its full context, whichever model answers next.

02

Auto mode

Fast models for everyday turns, frontier models for deep reasoning.

03

One plan

Arcus Unlimited covers every frontier model for less than two lab subscriptions.

App Store screenshot, model picker03

ArcusProduct

The product

It shows you. Not just tells you.

Charts and artifactsBuilt live, ready to export

Files of any formatPDF, Word, Excel, PowerPoint, code

ArcusCapabilities

Real work

An assistant that does the work.

01

Live web research

Private search and crawling, with citations you can open and check.

02

Charts, diagrams and documents

Native artifacts for stocks, budgets, architecture flows and printable reports.

03

Code execution

Model-written code runs in an isolated sandbox and returns real output.

04

Memory and vision

Preferences carry across chats. Send a photo and ask anything.

App Store screenshot, web research with sources05

ArcusArchitecture

How it is built

Our own stack, end to end.

01 / CLIENT

Native app

Flutter on iPhone and iPad with a token-by-token streaming parser and native artifact rendering.

FlutterSSERevenueCat

02 / GATEWAY

Agent core

Sessions, tool orchestration, approvals, memory and background jobs.

FastAPIARQPostgrespgvector

03 / MODELS

Model router

One gateway across OpenAI, Anthropic, Google and xAI with failover and per-user cost tracking.

LiteLLMAuto routing

04 / TOOLS

Tool runtime

Search, crawl, document parsing and code execution, each isolated from the gateway.

SearXNGCrawl4AIDoclingSandbox

From the production repository06

ArcusWhy Daytona

Why Daytona

Code execution is our weakest layer. Daytona fixes it.

Today

Self-hosted runner

Python only
3 second run limit, 256 MB memory
No files persist between steps
No packages, no network, no web previews
We operate and patch the sandbox ourselves

With Daytona

Managed sandboxes

Python, Node, bash and any toolchain
Real workloads: data analysis, tests, builds
A persistent workspace per conversation
Packages, network and live app previews
Isolation and scaling handled by Daytona

Current limits from our code execution adapter07

ArcusBusiness model

Business model

Subscription first. Routed for margin.

Acquire

Free

Daily quota on Auto mode, research and files. Sign in with Apple in seconds.

Trial at the point of real value

Convert

Arcus Unlimited

Monthly and annual plans unlock unlimited use of every frontier model.

Billed through Apple, managed with RevenueCat

Protect

Smart routing

Everyday turns go to efficient models and hard problems to frontier ones, so cost follows difficulty.

Per-user usage tracked at the gateway

Acquisition through Apple Ads and Google Ads on existing AI-chat intent08

ArcusStatus

Where we are

Shipped and live, not a slide.

Sep 21

Live on the App Store

Released 2026, now on version 1.1.4.

5+

Frontier model families

GPT, Claude, Gemini and Grok, plus Auto.

iOS

iPhone and iPad

Native Flutter client with streaming.

24/7

Production stack

Gateway, router, search and storage running.

ArcusTeam

LSFounder

Founder

Linus Sebar

Founder, product and engineering

01

Built Arcus end to end

The iOS app, the agent gateway, the model router and the tool runtime.

02

Shipped, not prototyped

Took Arcus from first commit to a live App Store product in 2026.

03

Craft first

A calm, editorial product in a category full of clutter and dark patterns.

ArcusThe ask

The ask

Daytona credits to make every chat a real workspace.

60%

Code execution

Replace our runner with Daytona sandboxes for multi-language code, data work and tests inside chat.

25%

App previews

Ephemeral dev environments so users can open and try the apps Arcus builds for them.

15%

Browser agent

Sandboxed headless browsers for research and task automation on the web.

Planned allocation of program credits11

Thank you.

Every frontier model. One thread.

heyarcus.com[email protected]App Store: Arcus