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, iPhone, and iPad, ChatGPT receives a request only after disclosure, explicit 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
Use your ChatGPT account on Mac, iPhone, and iPad after explicit sharing consent. Apple Intelligence is the capability-gated fallback.
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 ChatGPT sign-in, reviewed changes, and permission-gated web research. Apple Intelligence is available as a fallback when the system supports it.
iPhone
Local writing, organization, preview, and export, with optional ChatGPT after sharing consent. Apple Intelligence is the capability-gated fallback.
iPad
The same local writing core on a larger surface, with optional ChatGPT after sharing consent and capability-gated Apple Intelligence as a fallback.
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, iPhone, and iPad may transmit your request, active document, selection, conversation context, writing guidance, permitted file excerpts, and enabled research query. Portia requires sharing consent before you submit a 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