Finish what you started.

A macOS focus app that picks up where you left off, blocks the distractions you choose, and helps you get unstuck without leaving your work.

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Early beta for Apple silicon Macs. OpenAI API key required.

Finish CS assignment · Debug parserFocus · 24:5924:5824:5724:5624:5524:5424:5324:5224:5124:5024:4924:4824:4724:4624:4524:44

Blocking: feed.example

parser.py

def parse_group(tokens): expr = parse_expr(tokens) if not tokens.peek(): return expr tokens.expect(")")

Docsfeed.example

Blocked during Focusfeed.exampleBack to: Debug parser

Drag a rectangle around what you want explained. Click the cloud or press Esc to cancel.

Get Unstuck

if not tokens.peek(): return expr

It looks like the parser stops before consuming the closing parenthesis. Check where it returns early.

How do I fix that?

Illustrative demo

Start a session from your Commitment. Nimbus picks up at your current step and applies the rule you set: block feed.example.
Open a site you chose to block and Nimbus stops the page, then points you back to your task.
Click the cloud, then drag a rectangle around the part of your screen you want explained.
Nimbus answers beside your work, and you can keep the conversation going.

Work you can return to. Limits you choose. Help when you're stuck.

Your work doesn't end when the timer does.

Start a Commitment for anything bigger than one sitting. Break it into steps, and Nimbus remembers where you left off so the next session starts at the first unfinished step.

Example Commitment

Finish CS assignment

Implement tokenizer(done)
Debug parserCurrent
Write tests(to do)
Final review(to do)

Where each session picks up

Session 1 starts hereImplement tokenizer
Session 2 resumes hereDebug parser
Session 3 resumes hereWrite tests

Choose how firm Nimbus is.

SoftStay aware without blocking.Nimbus can check in when you leave the apps or sites you chose, or go idle.FocusBlock the distractions you choose.Ending early takes a deliberate 60-second wait.LockedOnly what you need, until the timer ends.There's no end-early button.

Focus Session

Stay with it

Mark as doneEnd Session

Time Remaining

RUNNING18:42of 25:00

Focusing in

Blocked

Allowed

EEditorTTerminalRReference

CChatVVideoSSocial

EEditorTTerminal

Actions

End SessionEdit BlocklistChange Mode

Ending, editing the allowed apps, and changing mode are all unavailable until this session ends on its own. There is no cooldown and no override for a Locked session.

Get unstuck

Apps you choose are hidden, never quit, so your work isn't lost. Websites are blocked in supported Chromium-based browsers through the Nimbus extension. Safari and Firefox aren't supported yet.

Get help with exactly what you select.

Select with Rectangle or Lasso, then ask your question. The conversation stays beside your work, so you can follow up or select another area later.

Nothing is captured until you select.

Groceries

Oat milk
Rice
Tomatoes
Printer paper
Batteries

Lecture notes

Sequences and limits

A sequence converges when its terms settle toward a single value as n grows.

The definition below makes that idea precise.

The examples that follow use the definition directly.

DefinitionFor every ε > 0 there is an N such that |aₙ − L| < ε for all n > N.

What do ε and N mean here?✓↺

Ask Nimbus ×

DefinitionFor every ε > 0 there is an N such that |aₙ − L| < ε for all n > N.What do ε and N mean here?

ε is how close you want to get to the limit L. N is how far along the sequence you must go before every term stays that close.

Can you give a quick example?

Take aₙ = 1/n with L = 0 and ε = 0.01. Once n is above 100, every term is within 0.01 of 0.

Select screen area

Ask a follow-up…

Illustrative demo

Drag a rectangle around the part of your screen you want explained, then type a question if you like.
Nimbus moves next to your selection and opens a conversation.
The part you selected goes with your question, and the answer appears in the conversation.
Keep going in the same conversation, or select another area later.

You choose what Nimbus sees.

Nimbus doesn't watch or continuously record your screen.

When you ask for help, you select the part of your screen you want Nimbus to use.

No continuous screen capture.
Screen context is shared only when you explicitly select it for Get Unstuck.
Your selection, your question and the task you're working on are sent to OpenAI using your own API key.
Your API key is stored in the macOS Keychain, not in Nimbus's settings files.

More about privacy

Screenshots are kept in memory only and are never written to disk. They are released when you start a new conversation or quit Nimbus.
During a session, Nimbus compares the front app and your browser tab's site against the list you chose, and notices when you've been inactive so it can check in. It does not read what is on screen to do this.
Records of blocked website attempts keep only the hostname, the browser and the time. Never full addresses.
Step suggestions are optional and off by default. If you turn them on and ask for suggestions, your Commitment's title and steps, and the names of apps and sites you used during sessions, are sent to OpenAI.
The app has no analytics or advertising trackers.

This website has no analytics or advertising trackers. Cloudflare Turnstile is used to protect the waitlist from automated abuse.

Before you join

What Macs are supported?

Apple silicon Macs, on macOS 11 or later. Intel Macs are not supported.

Do I need an OpenAI API key?

Yes. Nimbus uses your own OpenAI API key for Get Unstuck and optional step suggestions. It's stored in your Mac's Keychain, and OpenAI bills usage to your account.

What browsers does website blocking support?

Chromium-based browsers, through the Nimbus browser extension. During the beta, setup uses your browser's developer mode. Beta invites include instructions.

What does Nimbus see on my screen?

Only the part you select, when you ask for help. Nimbus doesn't watch or continuously record your screen. More about privacy

How will beta access work?

Invites go out in batches by email. They include the app and setup steps.

Something you keep meaning to finish?That's one thing off your list.

What you needWhen your invite arrives

An Apple silicon Mac
macOS 11 or later
Your own OpenAI API key