# Gemini Spark vs Leon

> Leon scores 41 (E) to Gemini Spark's 24.5 (F) for assistant proactive. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gemini-spark-vs-leon
- Markdown: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.md (~2,600 tokens)
- Slim: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.min.md (~630 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-12

Leon scores 41 (E) on agent readiness against Gemini Spark's 24.5 (F), and leads in 5 of 7 scored categories. Gemini Spark leads on security & auth. Both do assistant proactive.

- Gemini Spark: grade F, 24.5/100, rank #974 of 986. Markdown https://www.anchorterminal.com/tools/gemini-spark.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-spark.json
- Leon: grade E, 41/100, rank #934 of 986. Markdown https://www.anchorterminal.com/tools/leon.md · JSON https://www.anchorterminal.com/api/v1/tools/leon.json
- Best AI personal assistants that act for one person: https://www.anchorterminal.com/best/personal-assistants/index.md
- All 190 assistants comparisons: https://www.anchorterminal.com/compare/personal-assistants/index.md

## Which one, for what

### Gemini Spark (F)

Good for: A person who already keeps mail, calendar and files in a personal Google Account and accepts Keep Activity being on.

Ahead on:
- Security & auth, 60 against 34

Watch for: No public API, SDK or MCP server for an outside agent was found. Spark is reached in the Gemini mobile app, the Mac app and gemini.google.com

### Leon (E)

Good 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 14
- Schema & documentation, 33 against 17
- Agent ergonomics, 57 against 9
- Payments & pricing, 60 against 10
- Transparency & trust, 60 against 49

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

| Category | Weight | Gemini Spark | Leon | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 14 | 32 | Leon +18 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 17 | 33 | Leon +16 |
| Agent ergonomics | 13% (16.2 this run) | 9 | 57 | Leon +48 |
| Security & auth | 14% (17.5 this run) | 60 | 34 | Gemini Spark +26 |
| Payments & pricing | 10% (12.5 this run) | 10 | 60 | Leon +50 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 17 | 15 | Gemini Spark +2 |
| Transparency & trust | 7% (8.8 this run) | 49 | 60 | Leon +11 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **24.5 · F** | **41 · E** | |

## Facts side by side

| Fact | Gemini Spark | Leon |
| --- | --- | --- |
| Kind | Platform | Agent harness |
| Vendor | Google LLC | Louis Grenard (Leon AI) |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth | None |
| Pricing | Paid | Free |
| x402 | no | no |
| Licence | Proprietary hosted service under the Google Terms of Service | MIT |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-05-19 | 2023-05-01 |
| Terms last updated | 2026-07-30 | no document linked |
| Privacy policy last updated | 2026-09-24 | no document linked |
| Customer content may train models | yes, with an opt-out |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | none | 18k stars |

## Verdicts

**Gemini Spark.** Google's help pages state what Spark confirms before doing, how to delete its remote browser and code data, and the risks of prompt injection. Spark has no public API, Google calls it experimental, and it runs only with Keep Activity on, the setting under which chats are used for model training and human review.

**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

### Gemini Spark

1. Do not plan an integration against Spark. No public API or MCP server was found, and a person must hold a Google AI Pro or Ultra subscription
2. Expect a confirmation request before sends, edits, purchases and web form submissions, and note that bulk changes to private Google Tasks run without one
3. Delete remote browser data and remote code execution data in Gemini Spark Settings after a sensitive session. Deleting a task thread or Gemini Apps activity does not remove them
4. Keep within 15 running tasks and 50 active schedules. A schedule does not run when 15 tasks are running or the usage limit is reached
5. Treat every safety statement here as Google's own description. None was tested, and no message was sent to the service

### 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, Gemini Spark or Leon?

Leon scores 41 (E) on agent readiness against Gemini Spark's 24.5 (F), and leads in 5 of 7 scored categories. Gemini Spark leads on security & auth.

### Are Gemini Spark and Leon open source?

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


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.json, and with the fewest tokens: https://www.anchorterminal.com/compare/gemini-spark-vs-leon.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "gemini-spark", "b": "leon"}`. From a terminal: `anchor compare gemini-spark leon`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/gemini-spark.json and https://www.anchorterminal.com/api/v1/tools/leon.json

## Other comparisons with Gemini Spark or Leon

- [AstrBot vs Gemini Spark](https://www.anchorterminal.com/compare/astrbot-vs-gemini-spark.md)
- [AstrBot vs Leon](https://www.anchorterminal.com/compare/astrbot-vs-leon.md)
- [CowAgent vs Gemini Spark](https://www.anchorterminal.com/compare/cowagent-vs-gemini-spark.md)
- [CowAgent vs Leon](https://www.anchorterminal.com/compare/cowagent-vs-leon.md)
- [GAIA vs Gemini Spark](https://www.anchorterminal.com/compare/gaia-vs-gemini-spark.md)
- [GAIA vs Leon](https://www.anchorterminal.com/compare/gaia-vs-leon.md)
- [Gemini Spark vs Grok Bot](https://www.anchorterminal.com/compare/gemini-spark-vs-grok-bot.md)
- [Gemini Spark vs Haven](https://www.anchorterminal.com/compare/gemini-spark-vs-haven.md)
- [Gemini Spark vs Hermes Agent](https://www.anchorterminal.com/compare/gemini-spark-vs-hermes-agent.md)
- [Gemini Spark vs Instinct](https://www.anchorterminal.com/compare/gemini-spark-vs-instinct.md)
- [Gemini Spark vs IronClaw](https://www.anchorterminal.com/compare/gemini-spark-vs-ironclaw.md)
- [Gemini Spark vs Lindy](https://www.anchorterminal.com/compare/gemini-spark-vs-lindy.md)
- [Gemini Spark vs nanobot](https://www.anchorterminal.com/compare/gemini-spark-vs-nanobot.md)
- [Gemini Spark vs NanoClaw](https://www.anchorterminal.com/compare/gemini-spark-vs-nanoclaw.md)
- [Gemini Spark vs Dots](https://www.anchorterminal.com/compare/gemini-spark-vs-openai-dots.md)
- [Gemini Spark vs OpenClaw](https://www.anchorterminal.com/compare/gemini-spark-vs-openclaw.md)
- [Gemini Spark vs PicoClaw](https://www.anchorterminal.com/compare/gemini-spark-vs-picoclaw.md)
- [Gemini Spark vs Poke](https://www.anchorterminal.com/compare/gemini-spark-vs-poke.md)
- [Gemini Spark vs QwenPaw](https://www.anchorterminal.com/compare/gemini-spark-vs-qwenpaw.md)
- [Gemini Spark vs ZeroClaw](https://www.anchorterminal.com/compare/gemini-spark-vs-zeroclaw.md)
- [Gemini Spark vs Zo Computer](https://www.anchorterminal.com/compare/gemini-spark-vs-zo-computer.md)
- [Grok Bot vs Leon](https://www.anchorterminal.com/compare/grok-bot-vs-leon.md)
- [Haven vs Leon](https://www.anchorterminal.com/compare/haven-vs-leon.md)
- [Hermes Agent vs Leon](https://www.anchorterminal.com/compare/hermes-agent-vs-leon.md)
- [Instinct vs Leon](https://www.anchorterminal.com/compare/instinct-vs-leon.md)
- [IronClaw vs Leon](https://www.anchorterminal.com/compare/ironclaw-vs-leon.md)
- [Leon vs Lindy](https://www.anchorterminal.com/compare/leon-vs-lindy.md)
- [Leon vs nanobot](https://www.anchorterminal.com/compare/leon-vs-nanobot.md)
- [Leon vs NanoClaw](https://www.anchorterminal.com/compare/leon-vs-nanoclaw.md)
- [Leon vs Dots](https://www.anchorterminal.com/compare/leon-vs-openai-dots.md)
- [Leon vs OpenClaw](https://www.anchorterminal.com/compare/leon-vs-openclaw.md)
- [Leon vs PicoClaw](https://www.anchorterminal.com/compare/leon-vs-picoclaw.md)
- [Leon vs Poke](https://www.anchorterminal.com/compare/leon-vs-poke.md)
- [Leon vs QwenPaw](https://www.anchorterminal.com/compare/leon-vs-qwenpaw.md)
- [Leon vs ZeroClaw](https://www.anchorterminal.com/compare/leon-vs-zeroclaw.md)
- [Leon vs Zo Computer](https://www.anchorterminal.com/compare/leon-vs-zo-computer.md)