Nexus

Nexus

One native, local-first productivity app for the Apple ecosystem — Mac · iPhone · iPad · Watch. Tasks, notes, meetings, projects, calendar and people in a single app, with an on-device AI assistant and a full MCP server so you can drive it all from Claude or any agent.

[](https://github.com/kacperpietrzyk/Nexus/actions/workflows/ci.yml) [](LICENSE)

[](https://github.com/kacperpietrzyk/Nexus/stargazers)

> 🚧 Beta (0.3.0). All the modules below are in the app today and on TestFlight. It's still > early — the on-device AI is experimental and polish varies module to module. Single-user by > design: your data lives in your own iCloud, and there are no app servers.

Why Nexus

Most of us juggle a notes app, a to-do app, a meeting recorder, an issue tracker and a calendar — four or five subscriptions, four or five silos that don't talk to each other. Nexus folds them into one native, private, local-first app for the Apple ecosystem. Everything lives in a single graph, so a task can link to the note it came from, the meeting that spawned it, and the person who asked for it.

The long-term goal is to make a dedicated Obsidian / Notion / Todoist / Linear / Circleback unnecessary for personal use. That's the destination — it's being built in the open, and you can try where it is today.

What's in the app today

Everything below ships in the current beta. Maturity varies; the AI assistant is explicitly experimental.

• Tasks — fast capture (⌘N on Mac), Today view, Inbox, recurring tasks, reminders, and

natural-language dates in English & Polish ("tomorrow 5pm", "jutro 17:00").

• Notes — Markdown editing with [[wiki-links]], tables, and a trash/restore flow.
• Meetings — capture, transcription, summaries, and extracted action items.
• Projects — lightweight project & issue tracking: sections, cycles, stages and key dates.
• Calendar — events and day planning that schedules around your existing commitments.
• People & Organizations — a lightweight personal CRM that links people to the work they touch.
• Sync — across your devices via CloudKit (private database). No shared database, no

third-party backend.

• Markdown export — every item exports to Markdown, so there's no lock-in.

🤖 Drive it from any MCP client

Nexus ships a built-in Model Context Protocol server that exposes its data model as 100+ tools across tasks, notes, meetings, projects, calendar and people. Point Claude (or any MCP client) at it and your assistant can read, create, link and reorganize your work directly — search your notes, file action items from a meeting, plan your day. This is the integration surface: instead of bolting on point integrations, Nexus exposes itself and lets agents do the rest.

🧠 On-device AI assistant (experimental)

A local-first assistant built on small on-device models (Gemma-class via MLX), with a propose-confirm flow — it never writes to your data without you accepting the change. It powers a daily brief, task assist, an agent chat that can use the tools above, and lightweight insights. On-device is the default; any cloud call is opt-in, gated by explicit consent and a quota check.

Roadmap

| Area | Status | |---|---| | Tasks — capture, Today, Inbox, recurring, NL dates, reminders | ✅ Beta | | Notes — Markdown, wiki-links, tables, trash | ✅ Beta | | Meetings — capture, transcription, summaries, action items | ✅ Beta | | Projects — sections, cycles, stages, key dates | ✅ Beta | | Calendar — events, day planning | ✅ Beta | | People & Organizations — personal CRM | ✅ Beta | | Sync — CloudKit private database, cross-device | ✅ Beta | | MCP server — drive the app from Claude / any agent | ✅ Beta | | On-device AI — assistant, daily brief, agent chat, insights | 🧪 Experimental |

Want to help shape direction? Open a Discussion or an issue.

Try the beta

TestFlight (Apple ID required; iOS 26 / macOS 26):

• iOS / iPadOS: https://testflight.apple.com/join/cQ97NSzW
• macOS: https://testflight.apple.com/join/YBxhZ7SQ (new builds clear Apple review before installable, so this may lag)

See [TESTING.md](TESTING.md) for how to give feedback.

Build from source

Prerequisites: macOS 26+, Xcode 26+ (Swift 6.2 toolchain), Homebrew.

brew install xcodegen swiftlint
git clone https://github.com/kacperpietrzyk/Nexus.git && cd Nexus
xcodegen generate          # generates Nexus.xcodeproj (gitignored) from project.yml
open Nexus.xcworkspace

The pure-Swift packages build and test with no Apple account at all:

cd Packages/NexusCore && swift test

For signed/device builds, copy Config/Signing.local.xcconfig.example to Config/Signing.local.xcconfig and set your Team ID — see [CONTRIBUTING.md](CONTRIBUTING.md).

Architecture

A native Swift/SwiftUI modular monolith in five layers (apps → feature modules → core → persistence/sync → adapters). Domain objects are typed entities wired together by a single polymorphic Link graph rather than typed relationships, so anything can link to anything. Persistence is SwiftData mirrored to the CloudKit private database; AI sits behind protocols, on-device first. See [docs/architecture.md](docs/architecture.md).

Contributing

PRs welcome — read [CONTRIBUTING.md](CONTRIBUTING.md) and the [Code of Conduct](CODEOFCONDUCT.md). Good first issues are labeled. Security issue? See [SECURITY.md](SECURITY.md).

License

[Apache License 2.0](LICENSE) © 2026 Kacper Pietrzyk.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: kacperpietrzyk
• Source: kacperpietrzyk/Nexus
• License: Apache-2.0

Install and usage instructions live in the source repository linked above.