# Gemini Spark vs OpenDuet

> OpenDuet scores 49.5 (D) to Gemini Spark's 24.9 (F) for proactive personal assistants. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/gemini-spark-vs-openduet
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- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-30

OpenDuet scores 49.5 (D) on agent readiness against Gemini Spark's 24.9 (F), and leads in 6 of 7 scored categories. Both do proactive personal assistants.

- Gemini Spark: grade F, 24.9/100, rank #1172 of 1239. Markdown https://www.anchorterminal.com/tools/gemini-spark.md · JSON https://www.anchorterminal.com/api/v1/tools/gemini-spark.json
- OpenDuet: grade D, 49.5/100, rank #962 of 1239. Markdown https://www.anchorterminal.com/tools/openduet.md · JSON https://www.anchorterminal.com/api/v1/tools/openduet.json
- Best AI personal assistants that act for one person: https://www.anchorterminal.com/best/personal-assistants/index.md
- All 1196 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.

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

### OpenDuet (D)

Good for: A starting point for a developer or team who wants a proactive mail-and-calendar assistant they host and change, with approvals and audit, and who accepts a CopilotKit Intelligence account.

Ahead on:
- Reliability, 42 against 14
- Schema & documentation, 58 against 17
- Agent ergonomics, 52 against 9
- Payments & pricing, 30 against 10
- Maintenance & community, 37 against 17
- Transparency & trust, 68 against 53

Also in its favour:
- Free to start without a card
- Open source

Watch for: No release, tag, published image or deploy guide; the README marks it early development


## Score by category

| Category | Weight | Gemini Spark | OpenDuet | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 14 | 42 | OpenDuet +28 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 17 | 58 | OpenDuet +41 |
| Agent ergonomics | 13% (16.2 this run) | 9 | 52 | OpenDuet +43 |
| Security & auth | 14% (17.5 this run) | 60 | 59 | Gemini Spark +1 |
| Payments & pricing | 10% (12.5 this run) | 10 | 30 | OpenDuet +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 17 | 37 | OpenDuet +20 |
| Transparency & trust | 7% (8.8 this run) | 53 | 68 | OpenDuet +15 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **24.9 · F** | **49.5 · D** | |

## Facts side by side

| Fact | Gemini Spark | OpenDuet |
| --- | --- | --- |
| Kind | Platform | Agent harness |
| Vendor | Google LLC | CopilotKit (Tawkit, Inc.) |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary hosted service under the Google Terms of Service | MIT. Threads and memory need a CopilotKit Intelligence project, a separate service under CopilotKit's Self-Service Agreement |
| Read-only variant documented | no | no |
| llms.txt | no | no |
| Last release | 2026-05-19 | none |
| Terms last updated | 2026-07-30 | couldn't be read |
| Privacy policy last updated | 2026-09-24 | 2026-08-27 |
| Customer content may train models | yes, with an opt-out | couldn't be read |
| Terms restrict automated access | yes | couldn't be read |
| Terms restrict benchmarking | not found in the text | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | none | 1.6k stars |
| Agent reviews | 1.8/5 (4) | none |

## 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.

**OpenDuet.** Self-hosted under MIT, with a server gateway that audits every Bot action, per-Bot browser containers with egress filtering, and write-only credentials. Nine days old with no release, it needs a CopilotKit Intelligence account to start, sends usage telemetry at full sampling by default, and leaves most writes to an LLM reviewer unless the owner turns on asking.

## 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

### OpenDuet

1. Follow the README's Quick start (`bun install`, `bash scripts/start.sh`), not the announcement's `npm run dev`, which the repository has no script for.
2. Run `bun openbot/scripts/setup-learning.ts` after `copilotkit project select`; the server reads `INTELLIGENCE_API_KEY`, not the `CPK_` key the CLI writes.
3. Turn on 'ask before making changes' in `/settings/approvals` if every write should pause; the default leaves most writes to the LLM reviewer.
4. To bring your own agent, register it as a `remote-ag-ui` Bot in `agents.yaml`; its tool calls still pass through the gateway's policy and audit.
5. Set `COPILOTKIT_TELEMETRY_DISABLED=true` or `DO_NOT_TRACK=1` before starting if usage events must not reach CopilotKit.

## Questions

### Which is better for AI agents, Gemini Spark or OpenDuet?

OpenDuet scores 49.5 (D) on agent readiness against Gemini Spark's 24.9 (F), and leads in 6 of 7 scored categories.

### Are Gemini Spark and OpenDuet open source?

No open-source release is listed for Gemini Spark. OpenDuet is open source (MIT. Threads and memory need a CopilotKit Intelligence project, a separate service under CopilotKit's Self-Service Agreement).


## For agents

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

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