# Gemini Spark vs OpenDuet (slim)

> 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.

- Full: https://www.anchorterminal.com/compare/gemini-spark-vs-openduet.md (~4,050 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/gemini-spark-vs-openduet.json · canonical https://www.anchorterminal.com/compare/gemini-spark-vs-openduet
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-30
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

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: F 24.9, rank #1172 of 1239 · https://www.anchorterminal.com/tools/gemini-spark.min.md
- OpenDuet: D 49.5, rank #962 of 1239 · https://www.anchorterminal.com/tools/openduet.min.md
- Gemini Spark, good for A person who already keeps mail, calendar and files in a personal Google Account and accepts Keep Activity being on.
- OpenDuet, 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 Free to start without a card; Open source.

| Category | Gemini Spark | OpenDuet |
| --- | --- | --- |
| Reliability (16%) | 14 | 42 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 17 | 58 |
| Agent ergonomics (13%) | 9 | 52 |
| Security & auth (14%) | 60 | 59 |
| Payments & pricing (10%) | 10 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 17 | 37 |
| Transparency & trust (7%) | 53 | 68 |

| Fact (where they differ) | Gemini Spark | OpenDuet |
| --- | --- | --- |
| Kind | Platform | Agent harness |
| Vendor | Google LLC | CopilotKit (Tawkit, Inc.) |
| Auth | OAuth | OAuth or key |
| Pricing | Paid | Freemium |
| 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 |
| 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 |