Halo
Summary
Every AI assistant that runs in the cloud asks you to trust a server you don't control with everything you type, say, and see — Halo runs the same loop entirely on your Mac.
Halo sits in the notch, watches your screen, listens to calls, autocompletes in any app, and lets agents run standing jobs like inbox monitoring or repo watching — all without a single byte leaving the machine. The privacy story is real: the vendor states no telemetry, no cloud processing, local audio only. Where the ceiling shows up is platform lock: this is Mac-only, Apple Silicon assumed, so the moment your team mixes Windows or Linux machines, Halo covers nobody but you. Automations stop at notifications — Halo pings you before it acts, which means a human signs off every time, a feature for some and a friction point for others.
Bottom line: Pick this if you need a local AI layer across voice, writing, and call notes on a Mac and privacy is non-negotiable — but plan a different stack the moment your workflow requires agents that act without waiting for your approval or runs on anything other than Apple Silicon.
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Pros
Sign in to edit- All processing runs on-device with no telemetry, so confidential calls, proprietary code, and sensitive correspondence never touch a third-party server — the audit answer is always 'it stayed on the Mac'.
- Call recording produces a speaker-labeled transcript and summary the moment you hang up, so meeting notes and follow-up drafts exist before you close the window, without a separate app or upload step.
- Ghost-text autocomplete works across every app without switching context, so writing in a niche tool that has no native AI integration gets the same contextual assist as a first-class editor.
- Plain-language recall searches the meaning of past screen content and calls rather than exact strings, so 'what did Carlos say about the refund' returns the right answer weeks later without you remembering which app or meeting it came from.
- MCP server support means any tool with a Model Context Protocol endpoint can be added to Halo's action set, so the integration surface grows without waiting for the vendor to ship a native connector.
Cons
Sign in to edit- Halo runs only on Mac with Apple Silicon — the moment a team member is on Windows or Linux, or an older Intel Mac, they have no equivalent, and the team ends up running two separate setups with no shared memory or context between them.
- Every automation stops at a notification: Halo alerts you and waits for approval before acting, which is the right default for irreversible actions but means any workflow requiring fully autonomous execution — scheduled sends, auto-responses, triggered deploys — needs a different tool entirely.
- There is no API surface, so Halo's local memory and agent results cannot be read or written by external systems; teams that need to pipe call summaries into a CRM, push recall results into a shared knowledge base, or trigger Halo from a CI pipeline have no supported path and must export manually.
- Teams that evaluate this and need cross-platform agent coverage, shared team memory, or programmatic access will migrate to a cloud-based agent platform — the on-device privacy model that makes Halo compelling is the same constraint that makes it incompatible with collaborative or multi-machine workflows.
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About
- Platforms
- macOS (Apple Silicon)
- API Available
- No
- Self-Hosted
- Yes
- Last Updated
- 2026-07-03T04:34:44.147Z
Best For
Who it's for
- Mac users prioritizing on-device privacy
- Professionals needing meeting notes and follow-ups
- Writers seeking contextual autocomplete
- Users wanting unified local AI memory and actions
What it does well
- Voice-activated control and queries anywhere on Mac
- Autocomplete writing in any application
- Automatic call recording, transcription, and summarization
- Plain-language recall of past screen content and calls
- On-device automations for monitoring prices, inboxes, or repos
Integrations
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Frequently Asked Questions
- Is Halo free?
- Halo has a permanent free tier alongside paid upgrades. You can keep using a baseline version indefinitely without paying.
- Is Halo open source?
- No — Halo is a closed-source tool. Source code is not publicly available.
- Can I self-host Halo?
- Yes. Halo supports self-hosting on your own infrastructure.
- What platforms does Halo support?
- Halo is available on: macOS (Apple Silicon).
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Curated lists that include this category
Most AI tools that watch your screen, transcribe your calls, and autocomplete your writing do it by shipping everything to a cloud model you have no visibility into. Halo takes the opposite position: it runs on your Mac, learns from what crosses your screen and your calls, and surfaces that context — drafts, summaries, recalled details — through a persistent presence in the notch. The core loop is voice activation via ⌘⇧M or ‘Hey Halo’, contextual ghost-text autocomplete in any app, one-shortcut call recording with speaker-labeled transcripts, and plain-language recall of past screen content and conversations.
The differentiating feature is the combination of persistent local memory with autonomous monitoring. You describe a standing job — watch this inbox, track this repo, alert me when this price moves — and Halo runs it on your machine while you work. Critically, the vendor states it notifies but never sends, buys, or deletes without your approval, so you stay in the loop on every consequential action. For teams where compliance or confidentiality rules out cloud agents, that architecture matters.
Halo fits a specific profile: a Mac user who wants unified voice control, meeting notes, contextual writing assist, and lightweight agent automation without surrendering data to a third-party server. It breaks, or simply doesn’t exist, the moment you need cross-platform coverage, an API to connect Halo’s memory to other systems, or agents that execute autonomously without a confirmation step. Teams building shared automation pipelines will hit that wall fast.
On the integration side, the vendor describes built-in connections to Calendar, Mail, and Contacts, plus support for any MCP server — so you can point Halo at additional tools via the Model Context Protocol and it will use them within the same on-device loop. There is no public API, which means Halo’s context and actions stay local to the machine and are not programmable from external systems.