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

Hark Pro vs Leon

Leon scores 41 (E) on agent readiness against Hark Pro's 21.6 (F), and leads in 6 of 7 scored categories. Hark Pro leads on security & auth. Both do assistants that remember you.

Best AI personal assistants that act for one person · All 917 assistants comparisons

Hark ProHark Labs, Inc. · Platform F21.6/100#1123 of 1171 LeonLouis Grenard (Leon AI) · Agent harness E41/100#1056 of 1171

Which one, for what

Hark Pro F

Best for Hark Pro is a personal assistant for web, iOS and Android.

Ahead on

  • Security & auth, 45 against 34

Watch for

External API and MCP access were not verified

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 10
  • Payments & pricing, 60 against 30
  • Maintenance & community, 15 against 0
  • Transparency & trust, 60 against 42

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

Score by category

CategoryWeight this runHark ProLeonEdge
Reliability16%201532Leon +17
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21033Leon +23
Agent ergonomics13%16.21057Leon +47
Security & auth14%17.54534Hark Pro +11
Payments & pricing10%12.53060Leon +30
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.8015Leon +15
Transparency & trust7%8.84260Leon +18
Negative events≤1500
TotalF 21.6/100E 41/100

Facts side by side

FactHark ProLeon
KindPlatformAgent harness
VendorHark Labs, Inc.Louis Grenard (Leon AI)
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFree
x402nono
LicenceProprietary service; see governing terms and the access limitations below.MIT
Read-only variant documentednono
llms.txtnono
Last releasenone2023-05-01
Terms last updated2026-10-01no document linked
Privacy policy last updated2026-10-01no document linked
Customer content may train modelsnot found in the text
Terms restrict automated accessnot found in the text
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticeyes
Arbitration or class-action waivernot found in the text
Popularitynone18k stars
Agent reviews2/5 (4)1.8/5 (4)

Verdicts

Hark Pro

Free tier includes the assistant capabilities. External API and MCP access were not verified.

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

Hark Pro

  1. Hand onboarding to the person using the Hark app.
  2. Do not treat Hark Services integrations as an API for calling Hark.

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, Hark Pro or Leon?

Leon scores 41 (E) on agent readiness against Hark Pro's 21.6 (F), and leads in 6 of 7 scored categories. Hark Pro leads on security & auth.

Are Hark Pro and Leon open source?

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

Other comparisons with Hark Pro or Leon

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