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CosVoice
CosVoice
Gives your AI assistant (Grok, Claude, ChatGPT and others) its own US phone number and email, so it can make and answer calls and send written summaries.
Martin
Martin
A personal AI assistant like Jarvis: manages your calendar, inbox, reminders, and even makes calls and texts on your behalf.
Highlighted rows differ between these picks
| Attribute | CosVoice | Martin |
|---|---|---|
| Category | Personal Assistant Agent | Personal Assistant Agent |
| Pricing | From $29/mo Starter $29/month for 100 minutes; Plus $79; Pro $199; extra minutes $0.25 | From $21/mo Free trial; Standard from $21/month billed yearly |
| Test it | Free trial | Free trial |
| Channels | Phone SMS Email MCP | iOS Web Phone SMS Slack Email WhatsApp |
| Call direction | Both | — |
| Human handoff | No | — |
| Setup | Low Low - connect your assistant over MCP and save the number | Low Low - connect calendar and inbox, then talk to it |
| Useful for |
|
|
| Integrations | ||
| Google Calendar | ||
| Gmail | ||
| MCP | — | |
| Grok | — | |
| Claude | — | |
| ChatGPT | — | |
| Cursor | — | |
| Calendly | — | |
| Zoom | — | |
| OpenTable | — | |
| +6 more across these tools — see each profile for the full list. | ||
| Strengths |
|
|
| Limitations |
|
|
Category
- CosVoice
- Personal Assistant Agent
- Martin
- Personal Assistant Agent
Pricing
- CosVoice
From $29/mo
Starter $29/month for 100 minutes; Plus $79; Pro $199; extra minutes $0.25
- Martin
From $21/mo
Free trial; Standard from $21/month billed yearly
Test it
- CosVoice
- Free trial
- Martin
- Free trial
Channels
- CosVoice
- PhoneSMSEmailMCP
- Martin
- iOSWebPhoneSMSSlackEmailWhatsApp
Call direction
- CosVoice
- Both
- Martin
- —
Human handoff
- CosVoice
- No
- Martin
- —
Setup
- CosVoice
Low
Low - connect your assistant over MCP and save the number
- Martin
Low
Low - connect calendar and inbox, then talk to it
Useful for
- CosVoice
- • Giving an AI assistant a phone line
- • Delegated calls and bookings
- • Answering missed personal calls with summaries
- • MCP-based assistant workflows
- Martin
- • Calendar and inbox management
- • Reminders and wake-up calls
- • Delegating texts and calls
- • Daily organization
Integrations
| CosVoice | Martin | |
|---|---|---|
| Google Calendar | ||
| Gmail | ||
| MCP | — | |
| Grok | — | |
| Claude | — | |
| ChatGPT | — | |
| Cursor | — | |
| Calendly | — | |
| Zoom | — | |
| OpenTable | — |
+6 more across these tools — see each profile for the full list.
Strengths
- CosVoice
- • Gives existing AI assistants a real phone number
- • Works over MCP with several assistants
- • Written summary after every call
- Martin
- • Takes real actions, not just answers
- • Reachable by phone call and SMS, not just an app
- • Calendar, inbox, and messaging in one assistant
Limitations
- CosVoice
- • US phone numbers only
- • Trial requires a card and converts to a paid plan
- • Several listed integrations are marked as coming soon
- Martin
- • Requires broad account access to be useful
- • No free tier beyond the trial
- • Young product compared to big-tech assistants