WhatSyncWhatSync vs TimelinesAI: which WhatsApp–Attio integration fits?
An honest 2026 comparison of WhatSync and TimelinesAI for Attio sync, shared inboxes, AI access, pricing, and WhatsApp connection options.
· 8 min read
The quick answer
WhatSync is the leaner Attio-first choice. TimelinesAI is the broader WhatsApp operations suite. The right answer depends on whether the CRM record or the shared inbox is your team's real home.
At a glance
| Decision | WhatSync | TimelinesAI |
|---|---|---|
| Product centre | Attio CRM | WhatsApp workspace plus CRM integrations |
| Existing number | Yes, linked like WhatsApp Web | Yes, linked like WhatsApp Web |
| Official API path | Available for WABA workflows | Listed as coming soon on current Attio page |
| Attio sync | Automatic notes and phone matching | Automatic notes and phone matching |
| Send from Attio | Business plan | CRM Integration plan |
| Shared inbox | Inside Attio on Business | Standalone and inside Attio on $40 tier |
| AI access | MCP search and user-approved sends | MCP, agents, summaries, and automation features |
| Monthly entry | $19 per number | $25/seat |
Prices are vendor software prices checked September 1, 2026. Taxes, Meta messaging charges, and setup work are separate.
This is the closest comparison
Both products can link an existing WhatsApp number, match a conversation to an Attio person, create a person when no match exists, save messages as CRM context, and send from Attio. Unlike Zapier or Make, neither asks you to assemble the basic sync from individual automation steps.
The difference is product shape. WhatSync keeps narrowing toward an Attio-native WhatsApp layer. TimelinesAI is expanding into a broader WhatsApp system with a shared inbox, campaigns, assignments, analytics, several CRMs, APIs, and workflow tools.
Choose WhatSync for an Attio-first operating model
WhatSync works best when sales and client work already happens in Attio and WhatsApp is the missing data source. Its Personal plan handles automatic sync and contact creation. Business adds reply and inbox tools in Attio. The MCP connector adds permitted history search and user-approved one-to-one sends.
It is deliberately narrower and less expensive at the entry point. Personal is $19 a month, or $15 a month when billed annually.
- Your team lives in Attio, not in a separate inbox all day
- You want a lower-cost automatic sync before buying a larger suite
- AI search and approved one-to-one replies are useful
Choose TimelinesAI for a broader WhatsApp operation
TimelinesAI is stronger when conversation operations need their own workspace. Its $40 shared inbox tier adds team-wide inbox access, filters, full history, mass-message credits, and the ability to start chats from the inbox. The platform also lists assignments, labels, workflow automation, public API, webhooks, AI agents, and several native CRM integrations.
For a support or high-volume sales team, those are not side features. They may be the reason to buy. TimelinesAI also states that it syncs chat media and attachments into Attio. WhatSync saves photos, videos, voice notes and documents with the messages on linked personal WhatsApp.
- The team needs a dedicated shared inbox with ownership and filters
- You use several CRMs or may move away from Attio
- Campaigns, analytics, API access, and automation sit in one vendor
- Syncing attachment files into the CRM is important today
Connection method is not a footnote
Linking personal WhatsApp is quick and works with the WhatsApp account a person already uses. It is useful for founder-led sales and teams whose relationships live on individual numbers. An official WhatsApp Business Account is better suited to approved templates, governed business messaging, and a dedicated business number, but setup and Meta rules are different.
WhatSync supports personal WhatsApp and an official API path, with different capabilities on each. TimelinesAI's current Attio page is centred on linked personal numbers and marks WABA support as coming soon on its automation plan. Buyers should test the exact connection they intend to operate rather than assuming every feature works on both paths.
The AI story is different too
WhatSync's agent access lets a verified user search permitted synced messages and prepare a one-to-one send. The signed-in user approves the recipient and exact text in WhatSync. Attachment names and captions are searchable when available, but document contents, image text, and voice notes are not yet indexed.
TimelinesAI markets a wider AI and automation surface, including WhatsApp MCP, MCP skills, ChatGPT agents, summaries, auto-replies, and workflow tools. Buyers should compare the exact connection and approval flow their team needs.
Bottom line
Pick WhatSync when you want WhatsApp to disappear into a clean Attio workflow. Pick TimelinesAI when you want a WhatsApp operations product that also keeps Attio current. If the team cannot answer where conversations should be assigned, reviewed, and replied to every day, run both trials against that workflow before comparing feature counts.
Questions
- Is WhatSync cheaper than TimelinesAI?
- At published monthly entry prices, yes. WhatSync Personal starts at $19 a month and TimelinesAI CRM Integration starts at $25 per seat monthly. The included feature sets differ, so compare the tier that covers your actual inbox and sending needs.
- Which product has the better shared inbox?
- TimelinesAI has the broader standalone inbox product, with filters, assignments, history, analytics, and campaign features across its tiers. WhatSync's inbox is designed to keep work inside Attio rather than replace it with a broad separate workspace.
- Can both sync media into Attio?
- TimelinesAI says its Attio integration syncs chats, media, and contact data. WhatSync saves photos, videos, voice notes and documents from linked personal WhatsApp, with their type, caption and filename.
- Which one supports AI assistants?
- Both market AI-assistant connections. WhatSync supports MCP search over permitted history and user-approved one-to-one sends. TimelinesAI markets a broader set of MCP, agent, summary, auto-reply, and workflow capabilities.
Sources
We checked official vendor pages and project READMEs, not other comparison posts, and say where we used news coverage instead. WhatSync publishes this article and is one of the options covered.
- WhatSync pricing: Plans and current feature scope.
- WhatSync MCP guide: Read access and current media limitations.
- TimelinesAI Attio integration: Attio features, setup, media, and per-seat pricing.
- TimelinesAI pricing: Current CRM, shared inbox, and mass-messaging tiers.
Keep reading
Want your WhatsApp chats inside Attio?
Connect the number your team already uses, or start with the official WhatsApp Business API.