Scheduling and meetings decision
Coco
A capable developer can build a useful single-user replacement (messaging + calendar integrations + simple NLU) but reproducing Coco's long-term memory, polish, reliability, and multi-provider scale is nontrivial, so keeping the paid product is reasonable for full parity.
Visit website↗$4/mo
$48/yr
Read off the official pricing page.
$100one-off44 h to build
$50/mo6 h/mo upkeep
On cash alone, building overtakes the subscription at 15 seats.
Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need - the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship. All Coco alternatives, with the arithmetic →
What a replacement has to do
- Receive text/voice via WhatsApp/Telegram → parse intent and time → create/update calendar events or reminders in user's Google/Outlook calendar → schedule delivery of reminder messages → allow simple dashboard for preferences and billing.
What it still won’t have
- Polished, trained conversational prompts and long-term memory tuning
- Priority support and branded/whitelabeled event creation
- The product's existing user base and operational telemetry
- Production-hardened reliability, analytics, and edge-case dialect handling
- Any proprietary personalization/data optimizations not documented on the site
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 15 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a WhatsApp+Telegram calendar assistant using Node.js (Express), Postgres, and Redis for scheduling, integrate Google Calendar and Microsoft Graph via OAuth, and use OpenAI (or another LLM) for natural-language-to-scheduling parsing. Core features in scope: inbound message webhook handlers for WhatsApp/Telegram, OAuth calendar connect, create/edit/cancel events, recurring rules support, timezone-aware reminder scheduling jobs, user accounts, a minimal React dashboard for preferences and subscription management, and Stripe billing for the Executive tier. Out of scope: large-scale multi-tenant monitoring, advanced long-term memory storage beyond simple user preferences, and bespoke enterprise admin UI. Include error handling for OAuth failures, calendar conflicts, and delivery retries; include unit tests for parsing and integration tests for calendar operations.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 4 cited sources+3
- Price verified on pricing page+3
- Evidence score63
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 4
Every page the run actually retrieved.
- official productCoco — Your Calendar Assistant on WhatsApp & Telegram
- official pricingCoco Pricing
- open sourcemhss1/MyBrain
- open sourcelukevella/rallly
Integrity checks
What held up, and what did not.
