We're delivering on your biggest requests, including an advanced flow designer that ends AI unpredictability and a brand new test center that allows you ship perfect agents every time. And for the first time ever, we're bringing Synthflow Voice AI Agents to Whatsapp, with super easy integration and 24/7 inbound call coverage in the world's most popular messaging app.

Catch all the latest details in the changelog below. And as always, stay tuned for more great features coming soon!

Advanced Flow Designer

When you're handling millions of business critical calls, hoping for the best isn't a strategy. That’s why we’ve created the Advanced Flow Designer. The Advanced Flow Designer offers several improvements over the original version:

• Reliable conversation flow: Conversations now move through each node in a predictable, step-by-step sequence. This makes outcomes more reliable and easier to debug.

• Variable collection: Collect and store variables directly from users during calls, enabling more dynamic and personalized interactions.

• Branching logic: Define concrete rules—for example, if the user asks for Sales, route them to the Sales flow.

When creating a new agent, you can choose between the Original Flow Designer and the Advanced Flow Designer.

• Use the Original Flow Designer if you want a balance of flexibility and structure.

• Use the Advanced Flow Designer if you need strict, deterministic business logic.

Note: The Advanced Flow Designer is currently in beta, and we’re rapidly adding new features.

Learn more

Dynamic Transfers

Transfer calls dynamically based on conversation context, inputs, or business logic. No manual steps required.

• Context Aware Routing: Use conversation variables and conditional logic to send calls exactly where they need to go.

• Seamless Context Handoffs: Preserve the full conversation thread when transferring to human agents or external systems.

• First Call Resolution: Get customers to the right expert on the first try.

Transform every transfer into the right transfer.

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WhatsApp Business Calls

Your Voice Agents now work directly in WhatsApp, the world's most popular messaging platform. Connect with customers on their preferred channel without rebuilding your conversation logic.

• Zero Friction Access: Customers make calls directly in WhatsApp.

• Unified Experience: Your existing prompts, routing logic, and integrations work seamlessly across channels.

• Enterprise Ready: Built with compliance and scale in mind, so you can roll out globally with confidence.

Transform how customers connect with your business. Start reaching them where they already spend their time.

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Test Center & Simulations

Stop crossing your fingers when you deploy. Simulate complete phone conversations with your Synthflow AI Agent in the Test Center, validating changes before they reach production.

• Comprehensive Testing: Measure accuracy, prompt adherence, custom actions results, and regression test prompts and flows automatically.

• AI Generated Test Suites: Auto generate test cases from your agent's prompt and actions, then customize scenarios and success criteria as needed.

• Success Criteria Validation: Test for Customer Satisfaction (CSAT), Accuracy of Responses (Hallucinations), Repetitive Phrases & Fillers, Conversational Naturalness, and Task Completion automatically.

Prevent breaking changes from reaching production. Hit play, catch problems, and ship agents that work perfectly from day one.

Recording & Transcription Toggle

Control consent for recording and transcription across your assistants from the Configure tab or via API. Your agent will request consent and automatically start recording only when permission is granted.

• Set and Forget Configuration: Enable consent requirements across all agents from a single settings panel or via API.

• Personalized Messaging: Customize exactly what your agent says when requesting recording permission.

• Developer Friendly: Full API support with consent_recording and consent_text parameters in all agent endpoints.

Deploy compliant recording practices in minutes, not months.

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Secure Invites

Send invitation links that only work for the intended recipient, with automatic workspace access when they sign up.

• Foolproof Security: Invitation links are bound to specific email addresses, preventing unauthorized access.

• Zero Admin Overhead: Matching email addresses automatically grant workspace access without manual approval.

• Clear User Experience: Mismatched emails get helpful guidance to request new invitations.

Secure your workspace without slowing down your team.

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Role Management

We now support multiple Admins. The Super Admin retains full org control and is the primary workspace contact, while Admins (now multiple) can manage users and roles (except Super Admin), billing, and API keys. Members remain unchanged with access to core features only.

Learn more

More Updates

We've hardened the foundation so your agents keep working even when the unexpected happens.

• Automatic TTS Fallback: If ElevenLabs experiences issues, calls seamlessly switch to backup voice providers. Conversations continue without dropping, though you might notice slight voice changes in rare cases. Learn more

• 100% Uptime: Synthflow delivered uninterrupted reliability in August and September and implemented a 0-bugs policy.

• Support for External Call Identifiers: Instead of relying only on Synthflow’s internal call ID, you can include your own call ID (E.external_id) and preserve it across every transferred leg of a call. This makes it easier to match Synthflow activity with your PBX or CRM logs.

This is just the beginning. Quality, reliability, and scale remain our highest priorities. Thank you for the feedback that drives us to build what matters most.