Hollow is a complete suite of office, lifestyle, communication and automation apps that share one shell, one search box and one assistant. Ask in any app. Speak to it hands-free. Watch it do the work.
Hollow is still small. We’re onboarding teams gradually rather than all at once, so there are no customer logos or case studies here yet, just the product.
Hollow AI ships in three shapes: a full studio, a voice you can talk to, and an assistant inside every app, all backed by the same tools, the same memory and the same model choice.
The chat-first workspace. Conversations with branching and forks, a Design Space that renders live sites and React apps beside the thread, projects with indexed sources, artifacts you can edit, and image, video and audio generation in the same session.
Hollow Studio docs →Say it out loud. A live voice session that listens, answers, and runs the same tools as the chat, with a running transcript, results drawn on screen when reading them aloud would be silly, and an explicit confirm before anything is written.
Voice docs →Every app carries the same slide-in assistant, already grounded in what you are looking at. Ask Workbooks for a formula, Calendar for next week, Budgets where the money went. Same panel, same history, same models.
Assistant docs →Hollow AI carries a native toolset that reaches straight into your apps: create and complete tasks in batches, write notes, set workbook cells, build presentations and diagrams, add bills, book events, plan a week of meals, file and restore documents. Anything that changes your data is proposed first and waits for your approval.
Frontier reasoning, fast everyday chat, coding specialists, image, video and speech. Switch between them from the composer without leaving the conversation.
Every custom step in Cascade runs on HollowScript, the language we built in-house for it. Real functions, real types, real control flow, exactly like any language you already know, plus one rule the language itself enforces: a script can only reach the parts of Hollow you hand it, and it has to say so, in plain sight, before it ever runs.
// runs as a Cascade step, nothing more, nothing less uses tasks, notify constant urgent = effect tasks.where( `status:open priority:high` ) for task in urgent { match task.owner { none { effect notify("team", "Unassigned: ${task.title}") } else { effect notify(task.owner, "Urgent: ${task.title}") } } } return urgent.length()
Every capability a script can reach, such as querying Tasks or sending a notification, is declared in the open at the top of the file. Nothing ambient, nothing hidden.
A typo’d field or a mismatched type is flagged the moment the step is written, not three months later when the automation runs unattended at 3am and quietly fails.
Functions, records, loops and pattern matching, in familiar syntax. Nothing exotic to learn just to write a step.
HollowScript is what a Cascade step is actually written in: the logic that decides which tasks count as urgent, how a notification is worded, what happens if a call fails. It ships with the deterministic parts of a real language, including static types, closures, records, optionals with no null-shaped surprises, and exhaustive pattern matching, plus Hollow’s own filter syntax built in, so a step can query your data without leaving the language at all.
The backtick string inside tasks.where(...) above isn’t HollowScript. It’s HEL: a small, independent language for filtering records, shared by search boxes, saved views and smart lists across every Hollow app. HollowScript embeds it for .where(), but HEL has no knowledge of HollowScript and works anywhere Hollow needs a query someone can type by hand and get right first time.
status:todo priority>=high -tag:chore due<today+7 OR (assignee:none AND starred)
: equals, contains or is one of; = and != exact; < > <= >= for dates, numbers and ranked fields like priority.
Words, "quoted phrases", numbers, dates as 2026-07-01, ranges as a..b, and today/today+7. none and any match a field that’s empty or set.
A space is AND. OR branches. A leading - or NOT excludes. Parentheses group, so precedence is never a guess.
What each field means, such as which values rank like priority, is defined once per app; HEL itself has no idea what a task or a bill is. It never rejects a query outright: a half-finished one still returns a best-effort result, so a search box can filter live on every keystroke instead of waiting for enter.
Full syntax reference →A note can link a task. A task can block another. Mail can drop an attachment into Files. One switcher, one search, one account.
The same sidebar, topbar and dock in every app, with a switcher that never loses your place.
One search box that finds your work and runs commands, from wherever you happen to be.
Shared notes, boards, budgets and canvases show live cursors, presence and version history.
Light and Dark, plus your own accent colour, set once and applied suite-wide.
Pick your interface typeface in Appearance, including OpenDyslexic and Atkinson Hyperlegible.
Every app installs to your home screen or dock, keeps working offline and syncs when you reconnect.
Create an account and start with whichever app you need today. The rest is already waiting.
Invite-only during early access