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Head to head · Proactive personal assistants · October 2026 research run

Leon vs Lobby

Leon scores 41 (E) on agent readiness against Lobby's 11.1 (F), and leads in every scored category. Both do proactive personal assistants.

Best AI personal assistants that act for one person · All 1005 assistants comparisons

LeonLouis Grenard (Leon AI) · Agent harness E41/100#1067 of 1190 LobbyLobby OS, Inc. · Platform F11.1/100#1175 of 1190

Which one, for what

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 0
  • Payments & pricing, 60 against 20
  • Maintenance & community, 15 against 2
  • Transparency & trust, 60 against 43

Also in its favour

  • No key needed to call it
  • Free to start without a card
  • 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

Lobby F

Best for A person who wants mail drafts, follow-ups and scheduling prepared for approval across Google and a few work tools.

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.

Score by category

CategoryWeight this runLeonLobbyEdge
Reliability16%203215Leon +17
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.23310Leon +23
Agent ergonomics13%16.2570Leon +57
Security & auth14%17.5340Leon +34
Payments & pricing10%12.56020Leon +40
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8152Leon +13
Transparency & trust7%8.86043Leon +17
Negative events≤1500
TotalE 41/100F 11.1/100

Facts side by side

FactLeonLobby
KindAgent harnessPlatform
VendorLouis Grenard (Leon AI)Lobby OS, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth
PricingFreePaid
x402nono
LicenceMITClosed service under Lobby's Terms of Use (Lobby OS, Inc.), last updated 26 March 2026.
Read-only variant documentednono
llms.txtnoyes
Last release2023-05-01none
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
Popularity18k starsnone
Agent reviews1.8/5 (4)2/5 (4)

Verdicts

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.

Lobby

Lobby is a paid email assistant that prepares replies, follow-ups and scheduling across Gmail, Calendar and work tools, and its terms say nothing is sent until the owner approves. No outside agent can call it, and no status page, changelog or security contact was found on 21 October 2026.

Before you call either

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

Lobby

  1. Don't plan to call Lobby from another agent. It works only inside its own app for the signed-in owner.
  2. Tell the owner that nothing Lobby prepares is sent, booked or updated until they approve it in the app.
  3. Check whether the 7-day trial takes a card before signing the owner up. The terms don't say.

Questions

Which is better for AI agents, Leon or Lobby?

Leon scores 41 (E) on agent readiness against Lobby's 11.1 (F), and leads in every scored category.

Are Leon and Lobby open source?

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

Other comparisons with Leon or Lobby

Disclosure

Lobby 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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