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

Caddy vs Gemini Spark

Gemini Spark scores 24.5 (F) on agent readiness against Caddy's 16.7 (F), and leads in 4 of 7 scored categories. Caddy leads on payments & pricing and maintenance & community. Both do proactive personal assistants.

Best AI personal assistants that act for one person · All 834 assistants comparisons

CaddyCaddy Technologies Inc. · Platform F16.7/100#996 of 1010 Gemini SparkGoogle LLC · Platform F24.5/100#982 of 1010

Which one, for what

Caddy F

Best for People who want a free assistant in iMessage or RCS that watches mail, calendars and work tools and asks before acting.

Ahead on

  • Payments & pricing, 30 against 10
  • Maintenance & community, 55 against 17

Watch for

No API, MCP server or A2A endpoint for an outside agent.

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.

Ahead on

  • Schema & documentation, 17 against 10
  • Agent ergonomics, 9 against 0
  • Security & auth, 60 against 0

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

Score by category

CategoryWeight this runCaddyGemini SparkEdge
Reliability16%201014Gemini Spark +4
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.21017Gemini Spark +7
Agent ergonomics13%16.209Gemini Spark +9
Security & auth14%17.5060Gemini Spark +60
Payments & pricing10%12.53010Caddy +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.85517Caddy +38
Transparency & trust7%8.85249Caddy +3
Negative events≤1500
TotalF 16.7/100F 24.5/100

Facts side by side

FactCaddyGemini Spark
KindPlatformPlatform
VendorCaddy Technologies Inc.Google LLC
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyOAuth
PricingFreePaid
x402nono
LicenceClosed service under Caddy's Terms of Service (Caddy Technologies Inc., last updated 27 April 2026).Proprietary hosted service under the Google Terms of Service
Read-only variant documentedyesno
llms.txtyesno
Last release2026-10-132026-05-19
Terms last updated2026-07-30
Privacy policy last updated2026-09-24
Customer content may train modelsyes, with an opt-out
Terms restrict automated accessyes
Terms restrict benchmarkingnot found in the text
Terms or service can change without noticenot found in the text
Arbitration or class-action waivernot found in the text

Verdicts

Caddy

Caddy is a free iMessage and RCS assistant in public beta that watches connected mail, calendars and work apps and asks before sending email or changing data. No outside agent can call it, and no status page, changelog or security contact was found, though its iOS app ships every week or two.

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.

Before you call either

Caddy

  1. Don't plan to call Caddy from another agent. It answers the owner's text messages, Siri and group chats it's added to.
  2. Expect Caddy to ask the owner before it sends email or creates an invite.

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

Questions

Which is better for AI agents, Caddy or Gemini Spark?

Gemini Spark scores 24.5 (F) on agent readiness against Caddy's 16.7 (F), and leads in 4 of 7 scored categories. Caddy leads on payments & pricing and maintenance & community.

Other comparisons with Caddy or Gemini Spark

Disclosure

Caddy competes with LocalGhost, which Anchor Terminal's founder builds. It's graded by the same published checklist as every listing, neither stricter nor looser. Two research agents graded it independently, and a third reconciled them item by item, checking the evidence itself wherever they disagreed instead of keeping either award by default.

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