Get an audit

Head to head · Assistants that remember you · October 2026 research run

Leon vs Tab

Leon scores 41 (E) on agent readiness against Tab's 10.7 (F), and leads in 6 of 7 scored categories. Tab leads on maintenance & community. Both do assistants that remember you.

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

LeonLouis Grenard (Leon AI) · Agent harness E41/100#938 of 1010 TabTerrasoft, Inc. · Platform F10.7/100#1003 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 0
  • Agent ergonomics, 57 against 0
  • Security & auth, 34 against 4
  • Payments & pricing, 60 against 0
  • Transparency & trust, 60 against 45

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

Tab F

Best for A person who wants a texting assistant that browses, calls and buys with tight checkout controls.

Ahead on

  • Maintenance & community, 58 against 15

Watch for

Private beta behind a waitlist.

Score by category

CategoryWeight this runLeonTabEdge
Reliability16%20325Leon +27
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.2330Leon +33
Agent ergonomics13%16.2570Leon +57
Security & auth14%17.5344Leon +30
Payments & pricing10%12.5600Leon +60
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81558Tab +43
Transparency & trust7%8.86045Leon +15
Negative events≤1500
TotalE 41/100F 10.7/100

Facts side by side

FactLeonTab
KindAgent harnessPlatform
VendorLouis Grenard (Leon AI)Terrasoft, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthNoneOAuth or key
PricingFreePaid
x402nono
LicenceMITClosed service under Tab's Terms of Use (Terrasoft, Inc., effective 2 September 2026).
Read-only variant documentednono
llms.txtnono
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

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.

Tab

Tab is a private-beta texting assistant with a detailed security page on credential isolation and checkout binding, and a public updates page. No outside agent can call it, no price is published, and its privacy policy says nothing on training with user content.

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

Tab

  1. Don't plan to call Tab from another agent. It answers only the owner's Messages or WhatsApp thread.
  2. Tell the owner that access needs a waitlist place and no price is published.

Questions

Which is better for AI agents, Leon or Tab?

Leon scores 41 (E) on agent readiness against Tab's 10.7 (F), and leads in 6 of 7 scored categories. Tab leads on maintenance & community.

Are Leon and Tab open source?

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

Other comparisons with Leon or Tab

Disclosure

Tab 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.

Machine-readable

For companies

Do agents find, use and choose your tools?

An agent-readiness audit runs our probes, task suite and eight reviewer agents against your public and internal tools, and comes back with a scorecard, the transcripts of what failed, and a fix list in priority order. From $2,500, re-run included. We never take payment to move a rank. We do help companies earn one.

Get an auditSee a sample report