Synthflow
by Synthflow AI
Enterprise AI voice agents for contact centers, BPOs and multi-location phone operations
Synthflow is an enterprise voice AI platform whose agents answer and place phone calls, book appointments, qualify leads and update CRMs during the call. It is for contact centers, BPOs and multi-location brands that need routine calls handled inside existing phone systems without adding agent headcount.
Synthflow is a Berlin-based voice AI platform that builds agents to answer and place phone calls for contact centers, business process outsourcers and multi-location brands. Agents route calls, book appointments, qualify leads, update CRMs during the call and hand off to a person with a transcript, and callers can interrupt or switch languages mid-call. SMS and WhatsApp agents are limited to US workspaces, with web chat in all regions. The company connects to phone systems including Zoom, Five9, RingCentral, 8x8, Twilio, Telnyx, Vonage and Freshcaller, with Genesys Cloud and other SIP-compatible systems through an Enterprise setup, and to business systems such as Salesforce, HubSpot, Zendesk and Freshworks. Founded in 2023 by Albert Astabatsyan, Hakob Astabatsyan and Sassun Mirzakhan-Saky, it raised a $20 million Series A led by Accel in June 2025, for $30 million in total funding. Synthflow began with self-serve plans for small businesses and has since retired them: its pricing page now says every new deployment starts on an annual Enterprise contract, with no published rate. The vendor reported 1M+ calls a day, 99.99% uptime and 100+ enterprise customers on its site in November 2026, naming YMCA, Batteries Plus, Yardi, 8x8, Visma, Freshworks and Thryv. It lists SOC 2 Type II, ISO 27001, PCI DSS v4.0.1, a HIPAA BAA and US or EU workspace hosting. Independent evidence is mixed. Trustpilot showed 4.1 out of 5 from 215 reviews on November 11, 2026, with recent complaints about cancellation billing and slow support, and competitor CloudTalk cites two tests measuring response times of 800 to 2,000 ms against the vendor's 500 ms figure.
A contact center or BPO operations leader with high routine call volume on a supported phone system and budget for an annual enterprise contract.
Routine inbound and outbound calls are handled by AI agents that write results to the CRM and transfer exceptions to staff with a transcript.
At a Glance
- Category
- Audio & Voice
- Pricing
- Contact for pricing
- Target Market
- Contact Center Leaders, BPO Operators, VPs of Customer Experience, CIOs
- Deployment
- Cloud-only
- Founded
- 2023
- Headquarters
- Berlin, Germany
- Team Size
- 51-200
- Customers
- 100+ enterprise customers (vendor figure, synthflow.ai, November 2026)
Key Features
- ✓Inbound and outbound voice agents
Agents answer and place calls, route them, book appointments, qualify leads and send SMS follow-ups in supported regions.
- ✓Telephony integrations
Connects to Zoom, Five9, RingCentral, 8x8, Twilio, Telnyx and Vonage, so deployments keep the existing phone system.
- ✓Human handoff with transcript
Transfers a caller to a person along with the full transcript so the caller does not repeat details.
- ✓Pre-launch testing and staged rollouts
Tests agents before launch, releases them in customer-approved stages and measures every call after go-live.
- ✓Call-level diagnostics
Exposes SIP ladders, packet captures and quality scores so telephony teams can trace individual call failures.
- ✓Data retention controls
Optional settings delete recordings, transcripts and caller IDs after 30 days, with US or EU workspace hosting.
Capabilities
Use Cases
- •Routine contact center deflection
Freshworks reports up to 65% of routine calls handled by AI alone and 75% shorter waits, per Synthflow's case study.
- •Multi-location call answering
Batteries Plus runs Synthflow across 700+ US locations on Zoom Phone, with a pilot delivered in five weeks, per Synthflow.
- •Full call coverage for SMB software
Thryv reports answering 100% of calls after reaching production in about a month, according to Synthflow's published case study.
- •White-label BPO deployments
BPO operators run white-label voice agents in separate client workspaces, all covered under a single annual Synthflow agreement.
Ideal For
Best For
- ✓Contact centers automating routine inbound calls on Five9, Zoom, RingCentral or 8x8
- ✓BPO providers that need white-label voice agents and separate client workspaces
- ✓Multi-location retail or service brands answering calls across hundreds of sites
- ✓Appointment booking and lead qualification over the phone with CRM updates during the call
- ✓European operators that need EU workspace hosting and a data processing agreement
Not Ideal For
- ✗Small teams and low-volume users, because self-serve plans are gone and third parties report contracts starting at $30,000 a year
- ✗Developers who want a code-first voice stack, since CloudTalk reports no official SDK and Vapi publishes usage-based rates
- ✗Teams automating email and chat ticket backlogs, since the product is built phone-first
- ✗Buyers outside the US that need SMS or WhatsApp agents, which are limited to US workspaces
Deployment
Market & Ratings
100+ enterprise customers (vendor figure, synthflow.ai, November 2026)
Market Analysis
Pros
- ✓Named enterprise references with published outcomes, including Batteries Plus, Freshworks and Thryv
- ✓Broad contact center telephony coverage across Five9, Zoom, RingCentral and 8x8
- ✓Reviewers on Trustpilot praise voice quality and ease of setup
- ✓Vendor-listed compliance covers SOC 2 Type II, ISO 27001, PCI DSS and a HIPAA BAA
Cons
- ✗No published prices and a reported $30,000 annual entry point after self-serve plans were retired
- ✗Trustpilot reviewers from March 2025 to April 2026 report continued billing after cancellation and difficulty reaching a person
- ✗Support after onboarding is the most consistent complaint, per CognitiveFuture's August 2026 review of G2 and Trustpilot feedback
- ✗Competitor CloudTalk cites two tests measuring 800 to 1,200 ms and about 2,000 ms, above the vendor's 500 ms response figure
- ✗Reviewers report glitches and latency spikes during calls, along with trouble with interruptions and ambiguous requests
- ✗Most public review volume predates the move upmarket, with only six Trustpilot reviews in the last 12 months
Pricing
Enterprise annual agreement
Contact for pricing
- ✓Scoped to call volume, phone system, integrations and security needs
- ✓Custom concurrency planning
- ✓White-label branding with separate client workspaces
- ✓Launch support where the agreement includes it
Synthflow's pricing page on November 11, 2026 lists only an annual enterprise agreement, with no published rate by the minute and no free plan. Macha and CloudTalk, both competitors, reported in August and September 2026 that contracts start at $30,000 a year. The former $29 to $899 monthly plans are retired.
Security & Compliance
Connect
Sources
This page was written from 10 sources, 6 on domains other than synthflow.ai.
- 1.synthflow.ai — synthflow.aivendor
- 2.synthflow.ai — pricingvendor
- 3.synthflow.ai — companyvendor
- 4.synthflow.ai — synthflow raises 20m series avendor
- 5.tech.eu — synthflow ai raises 20m to transform the global conversation
- 6.verdict.co.uk — synthflow ai raises 20m to expand voice ai platform
- 7.trustpilot.com — synthflow.ai
- 8.cloudtalk.io — synthflow ai review
- 9.getmacha.com — synthflow complete guide
- 10.cognitivefuture.ai — cognitivefuture.ai
Stay Ahead of the Curve
Weekly enterprise AI insights for technology leaders. No spam, no vendor pitches—unsubscribe anytime.
SubscribeRelated Products
Bland AI
Enterprise voice AI phone agents on in-house speech and language models, with self-hosted deployment for regulated calls
Pipecat
Open-source Python framework for real-time voice and multimodal AI agents, with a managed Pipecat Cloud
Retell AI
Developer platform for building, deploying and monitoring AI phone agents, billed per minute
AssemblyAI
Speech-to-text, speech understanding and voice agent APIs priced per hour of audio