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

Leon vs szn

Leon scores 41 (E) on agent readiness against szn's 7.3 (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

LeonLouis Grenard (Leon AI) · Agent harness E41/100#938 of 1010 sznNomadic Futures · Platform F7.3/100#1010 of 1010

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 5
  • 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 23

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

szn F

Best for A person who wants calls, emails and bookings done for them and has an access code.

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

Watch for

Early access by access code only.

Score by category

CategoryWeight this runLeonsznEdge
Reliability16%20325Leon +27
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%8.86023Leon +37
Negative events≤1500
TotalE 41/100F 7.3/100

Facts side by side

FactLeonszn
KindAgent harnessPlatform
VendorLouis Grenard (Leon AI)Nomadic Futures
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreeFree
x402nono
LicenceMITClosed service. No terms of service were found on theszn.ai. A privacy policy and an acceptable use policy (both last updated March 2026) apply.
Read-only variant documentednoyes
llms.txtnoyes
Last release2023-05-01none
Terms last updatedno document linkedno 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

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.

szn

szn is an errand assistant in early access that makes calls, sends emails and books for its owner, free during the preview for people with an access code. No outside agent can call it, no terms of service or legal entity appear in its policies, and its privacy policy says nothing on training.

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

szn

  1. Don't plan to call szn from another agent. It answers only its web app, iMessage, SMS and email for the owner.
  2. Tell the owner they need an access code to start, and that the acceptable use policy makes them responsible for confirming actions.

Questions

Which is better for AI agents, Leon or szn?

Leon scores 41 (E) on agent readiness against szn's 7.3 (F), and leads in every scored category.

Are Leon and szn open source?

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

Other comparisons with Leon or szn

Disclosure

szn 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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