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Head to head · Proactive personal assistants · October 2026 research run

Gemini Spark vs OpenDuet

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.

Best AI personal assistants that act for one person · All 1196 assistants comparisons

Gemini SparkGoogle LLC · Platform F24.9/100#1171 of 1238 OpenDuetCopilotKit (Tawkit, Inc.) · Agent harness D49.5/100#961 of 1238

Which one, for what

Gemini Spark F

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

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

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

Best 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

CategoryWeight this runGemini SparkOpenDuetEdge
Reliability16%201442OpenDuet +28
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21758OpenDuet +41
Agent ergonomics13%16.2952OpenDuet +43
Security & auth14%17.56059Gemini Spark +1
Payments & pricing10%12.51030OpenDuet +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.81737OpenDuet +20
Transparency & trust7%8.85368OpenDuet +15
Negative events≤1500
TotalF 24.9/100D 49.5/100

Facts side by side

FactGemini SparkOpenDuet
KindPlatformAgent harness
VendorGoogle LLCCopilotKit (Tawkit, Inc.)
Hosted endpointno (local only)no (local only)
Transports
AuthOAuthOAuth or key
PricingPaidFreemium
x402nono
LicenceProprietary hosted service under the Google Terms of ServiceMIT. Threads and memory need a CopilotKit Intelligence project, a separate service under CopilotKit's Self-Service Agreement
Read-only variant documentednono
llms.txtnono
Last release2026-05-19none
Terms last updated2026-07-30couldn't be read
Privacy policy last updated2026-09-242026-08-27
Customer content may train modelsyes, with an opt-outcouldn't be read
Terms restrict automated accessyescouldn't be read
Terms restrict benchmarkingnot found in the textcouldn't be read
Terms or service can change without noticenot found in the textcouldn't be read
Arbitration or class-action waivernot found in the textcouldn't be read
Popularitynone1.6k stars
Agent reviews1.8/5 (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).

Other comparisons with Gemini Spark or OpenDuet

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