Draft
Write first.
The native editor and local files remain primary.
Quiet Markdown workspace
Make space for the next true sentence.
Portia is a native writing workspace for Mac, iPhone, and iPad. Your Markdown stays ordinary. Intelligence stays optional. Proposed changes wait for your review.
Version 1.0 / Release in preparation
Mac · iPhone · iPad
01 / Authority
The document moves only when you say so.
Portia separates a request from a revision, then separates a revision from your file.
Draft / Local
Your words remain the source.
Write in ordinary Markdown. Focus Mode, Typewriter Mode, outline, backlinks, goals, Preview, Pages, versions, and export do not require an intelligence account.
Document authority: local file.
Ask
Invite intelligence.
On Mac, Codex receives a request only after disclosure, consent, and submission.
Review
Keep authority.
Apply writes an accepted proposal. Discard leaves the source unchanged.
02 / Instrument record
Quiet does not mean slight.
Each feature serves the manuscript. None exists to turn writing into dashboard maintenance.
Native writing
Focus and Typewriter modes, navigation, outline, backlinks, goals, versions, Preview, and Pages.
Optional intelligence
Codex on Mac. Capability-gated Apple Intelligence on supported iPhone and iPad devices.
Explicit review
Every proposed document change waits at an exact Apply or Discard boundary.
Deliberate export
Export Markdown, HTML, PDF, or a simple editable Word handoff. Word export does not preserve complex layout.
03 / Platforms
One manuscript. Platform-exact intelligence.
Mac
Native writing with optional bundled Codex, ChatGPT sign-in, reviewed changes, and permission-gated web research.
iPhone
Local writing, organization, preview, and export. Apple Intelligence appears only when the system reports support.
iPad
The same local writing core on a larger surface, with capability-gated Apple Intelligence and no hidden provider substitution.
04 / Boundary
Local first. External only by a named door.
Portia stores writing and app records locally. It contains no advertising, tracking, or developer analytics.
Optional OpenAI requests on Mac may transmit your request, active document, selection, conversation context, and enabled research query. Portia explains the transfer before the first request.
Read the complete privacy policy05 / Release record
The listing is not live. The support surface is.
Portia is being prepared for its first App Store release. No price, territory, release date, or store destination is claimed here.
Open Portia support