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Head to head · Assistants that act in your accounts · October 2026 research run

Brea vs Leon

Leon scores 41 (E) on agent readiness against Brea's 12.9 (F), and leads in every scored category. Both do assistants that act in your accounts.

Best AI personal assistants that act for one person · All 834 assistants comparisons

BreaBrea AI LLC · Platform F12.9/100#1001 of 1010 LeonLouis Grenard (Leon AI) · Agent harness E41/100#938 of 1010

Which one, for what

Brea F

Best for An iPhone user who wants an assistant across many apps and websites with per-action approval.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

No API, MCP server or A2A endpoint for an outside agent.

Leon E

Best for A developer who wants a self-hosted assistant with memory, computer use and a local model, and who will read the source.

Ahead on

  • Reliability, 32 against 15
  • Schema & documentation, 33 against 10
  • Agent ergonomics, 57 against 0
  • Security & auth, 34 against 7
  • Payments & pricing, 60 against 20
  • Maintenance & community, 15 against 4
  • Transparency & trust, 60 against 48

Also in its favour

  • No key needed to call it
  • Open source

Watch for

No tagged release of the core since 1.0.0-beta.8 on 1 May 2023. The 2.0 Developer Preview is installed by cloning the develop branch

Score by category

CategoryWeight this runBreaLeonEdge
Reliability16%201532Leon +17
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21033Leon +23
Agent ergonomics13%16.2057Leon +57
Security & auth14%17.5734Leon +27
Payments & pricing10%12.52060Leon +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8415Leon +11
Transparency & trust7%8.84860Leon +12
Negative events≤1500
TotalF 12.9/100E 41/100

Facts side by side

FactBreaLeon
KindPlatformAgent harness
VendorBrea AI LLCLouis Grenard (Leon AI)
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFree
x402nono
LicenceClosed service under Brea's terms (Brea AI LLC, last updated 2 July 2026).MIT
Read-only variant documentednono
llms.txtyesno
Last releasenone2023-05-01
Terms last updatedno document linked
Privacy policy last updatedno document linked
Customer content may train models
Terms restrict automated access
Terms restrict benchmarking
Terms or service can change without notice
Arbitration or class-action waiver
Popularitynone18k stars

Verdicts

Brea

Brea is an iMessage assistant with a free plan that needs no card, approval by reply before it sends, deletes or pays, and one-time Link cards for purchases. No outside agent can call it, paid prices sit inside the app, and no changelog or subprocessor list was found.

Leon

Connected-app credentials are encrypted per profile and the Gmail connection is read-only. The 2.0 Developer Preview has no tagged release, runs tools and a 30-minute proactive pulse with no approval step, listens on every network interface with client authentication off, and sends telemetry by default.

Before you call either

Brea

  1. Don't plan to call Brea from another agent. It answers only the owner's iMessage thread.
  2. Tell the owner that replying ALWAYS stops Brea asking again for that action.

Leon

  1. Clone the develop branch for 2.0. npm install --global @leon-ai/cli and docs.getleon.ai install and describe the legacy 1.0 betas
  2. Set client_interface.auth.enabled: true and a LEON_PROFILE_TOKEN before the machine joins a shared network. The server binds 0.0.0.0
  3. Set telemetry_enabled: false and runtime.pulse_enabled: false in the profile config.yml for an unattended or private run
  4. Use availability.tools.allowed to limit tools. Shell, file writes, computer use and browser control are otherwise available to the agent with no approval prompt
  5. Back up LEON_CONNECTIONS_ENCRYPTION_KEY from the profile .env. Without it the stored connections cannot be read

Questions

Which is better for AI agents, Brea or Leon?

Leon scores 41 (E) on agent readiness against Brea's 12.9 (F), and leads in every scored category.

Are Brea and Leon open source?

No open-source release is listed for Brea. Leon is open source (MIT).

Other comparisons with Brea or Leon

Disclosure

Brea competes with LocalGhost, which Anchor Terminal's founder builds. It's graded by the same published checklist as every listing, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed instead of keeping either award by default.

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