Shehub Arefin
Founder, Wave Runner
Wave Runner vs Synthflow AI
Wave Runner and Synthflow AI both serve agencies selling voice AI. Wave Runner charges $999/mo plus $0.10/min with white-label included, unlimited agents, and sub-800ms latency. Synthflow uses pay-as-you-go pricing at $0.15 to $0.24/min, and white-label costs an additional $2,000/mo on top of usage fees.
Synthflow is the most-searched voice AI platform name among agencies right now. They offer a no-code builder and claim 200+ integrations. Their pricing model recently shifted to component-based pay-as-you-go, and white-label access now sits behind a $2,000/mo add-on.
Here's the real cost math, feature gaps, and trade-offs so you can pick the right platform for how your agency actually operates.
What Is Synthflow AI?
Synthflow AI is a pay-as-you-go voice AI platform with a no-code builder for creating inbound and outbound AI phone agents. They claim 200+ integrations and target AI automation agencies, small businesses, and enterprises.
White-label is available, but only on their Agency plan at $2,000/mo on top of per-minute usage fees.
Synthflow lists SOC 2, HIPAA, PCI DSS, GDPR, and ISO 27001 certifications on their site.
The reviews are split. Synthflow holds a 4.5/5 on G2 and 4.4/5 on Trustpilot with 211 reviews. But 9% of Trustpilot reviews are one-star, with complaints about pricing bait-and-switch tactics, unexpected charges after plan changes, and support going silent after the sale.
Several Reddit threads echo the pricing frustration. Users describe signing up on one pricing model, then getting moved to a different structure mid-contract.
What Is Wave Runner?
Wave Runner is a white-label voice AI platform built specifically for agencies, MSPs, BPOs, and VoIP providers. One flat price: $999/mo plus $0.10/min.
The Partner plan includes everything:
→ Unlimited workspaces and unlimited agents → RAG knowledge base per client → Multilanguage support → Live call transfer to human agents → Custom domain and full white-label branding → Role-based access controls and client data isolation → Per-client reporting dashboards → Private Slack channel with dedicated account manager → Sub-800ms latency, included (not a paid add-on)
Setup is no-code. Most agencies deploy their first client in under an hour.
Wave Runner has 13 native integrations: HighLevel, HubSpot, Twilio, Slack, Gmail, Cal.com, Google Sheets, Notion, Webhooks, HTTP Request, OpenAI, Gemini, and Anthropic. Fewer than Synthflow's claimed 200+, but built around the tools agencies actually use daily.
Side-by-Side Comparison
| Feature | Wave Runner | Synthflow AI |
|---|---|---|
| Pricing | $999/mo + $0.10/min | Pay-as-you-go: $0.15-$0.24/min (voice engine + LLM + telephony) |
| White-label | Yes, included | Yes, $2,000/mo add-on |
| White-label cost | $0 (included in $999/mo) | $2,000/mo on top of usage |
| Latency | Sub-800ms, included | ~420ms average (low latency is $0.04/min add-on) |
| Multi-client management | Unlimited workspaces, one dashboard | Sub-accounts on Agency plan only |
| Workspaces/agents | Unlimited | Varies by plan |
| Setup | No-code, under 1 hour | No-code, drag-and-drop builder |
| Integrations | 13 native (agency-focused) | 200+ claimed |
| Inbound + outbound | Yes | Yes |
| Live call transfer | Yes | Yes |
| Knowledge base | RAG per client | Yes |
| Multilanguage | Yes | Yes |
| Appointment booking | Yes (Cal.com, HighLevel, HubSpot) | Yes |
| Per-client reporting | Yes, isolated dashboards | Limited, Agency plan only |
| Support | Private Slack + dedicated AM | Ticketing (Slack for first 30 days, then revoked) |
| Best for | Agencies scaling past 5K min/mo | Low-volume testing, compliance-heavy verticals |
Pricing Comparison: What You'll Actually Pay
Synthflow's pricing page looks simple until you calculate the real cost. Their pay-as-you-go model breaks into three components:
→ Voice engine: $0.09/min → LLM processing: $0.02 to $0.05/min (depends on model) → Telephony: $0.02/min
That puts your all-in cost at $0.15 to $0.24 per minute before any add-ons.
Want low latency? That's an extra $0.04/min. Want white-label? That's $2,000/mo on top of everything.
Wave Runner charges $999/mo flat plus $0.10/min. White-label included. Low latency included. Unlimited agents included.
Run the numbers at real agency volumes:
| Monthly Minutes | Wave Runner | Synthflow (no white-label) | Synthflow (with white-label) |
|---|---|---|---|
| 1,000 | $1,099 | $150 - $240 | $2,150 - $2,240 |
| 5,000 | $1,499 | $750 - $1,200 | $2,750 - $3,200 |
| 10,000 | $1,999 | $1,500 - $2,400 | $3,500 - $4,400 |
| 20,000 | $2,999 | $3,000 - $4,800 | $5,000 - $6,800 |
Synthflow looks cheaper if you don't need white-label and you're running low volume. Add white-label (which every agency reselling voice AI needs), and Wave Runner is cheaper at every volume level above 5,000 minutes.
At 20,000 minutes per month, the gap is $2,000 to $3,800 in Wave Runner's favor.
The Revenue Side
White-label access turns voice AI from a cost center into a revenue line.
Both platforms offer white-label. The difference is access. Wave Runner includes it at $999/mo. Synthflow charges $2,000/mo extra before you make your first client call.
With white-label, agencies typically charge clients $500 to $2,000/mo for voice AI as a managed service. Run 10 clients at $1,000/mo each, and you're generating $10,000/mo in recurring revenue.
On Wave Runner, your platform cost is $999/mo plus usage. Your margins stay healthy from client one.
On Synthflow, you're paying $2,000/mo for white-label access before adding per-minute costs. You need four or five clients just to cover the white-label fee. Every month.
That $2,000/mo white-label tax is the difference between building a profitable voice AI practice and subsidizing Synthflow's revenue.
Latency and Voice Quality
Synthflow advertises an average latency of around 420ms. That number requires a paid add-on.
Low latency on Synthflow is a paid add-on at $0.04/min extra. Without it, expect higher response times. Users on community forums report noticeable pauses on complex call flows, especially when the no-code builder chains multiple decision nodes.
Wave Runner delivers sub-800ms latency included in the base price. No add-on required.
Anything under 500ms feels natural in a phone conversation. Between 500ms and 800ms is acceptable. Above 800ms, callers start talking over each other.
Synthflow's paid latency add-on can produce lower raw numbers. Wave Runner provides consistent, included latency without surprise line items on your invoice.
White-Label and Multi-Client Management
Both platforms offer white-label branding. The economics are different.
Wave Runner includes white-label at $999/mo. Custom domain, your logo, your colors. Clients never see Wave Runner's branding. Every partner gets unlimited workspaces with isolated data per client, role-based access controls, and per-client reporting dashboards.
Synthflow requires the Agency plan at $2,000/mo on top of per-minute usage for white-label. The Agency plan includes sub-accounts for client management. Below the Agency tier, there's no white-label and no multi-client architecture.
For agencies running 10+ clients, Wave Runner's unlimited workspace model means onboarding client number 11 costs the same as client number 1. On Synthflow, the $2,000/mo white-label fee is fixed regardless of whether you have 2 clients or 200. That favors scale, but the entry cost is steep for agencies just starting their voice AI practice.
Setup and Ease of Use
Both platforms are no-code. Neither requires developers to deploy a basic voice AI agent.
Synthflow's drag-and-drop builder lets you visually map call flows. It handles simple use cases. But users describe it as "rigid" when building advanced multi-step flows. Conditional logic, dynamic routing, and complex branching push the limits of the visual editor. At that point, you're working around the builder instead of with it.
Wave Runner deploys a new client workspace in under an hour. The setup flow is guided: connect a phone number, upload a knowledge base, configure the agent personality, set call routing rules, and go live. No visual builder to wrestle with.
Synthflow has a visual flow builder. Wave Runner gets you live faster.
Integrations
Synthflow claims 200+ integrations. That number includes CRMs, calendars, messaging platforms, and various third-party tools.
Wave Runner has 13 native integrations: HighLevel, HubSpot, Twilio, Slack, Gmail, Cal.com, Google Sheets, Notion, Webhooks, HTTP Request, OpenAI, Gemini, and Anthropic.
Synthflow claims more integrations. If you need a native connection to a niche CRM or industry-specific tool, they list more connectors.
Wave Runner wins on depth for agency workflows. HighLevel and HubSpot cover the two CRMs that 80%+ of marketing agencies actually use. Twilio handles telephony. Cal.com handles booking. Webhooks and HTTP Request cover custom connections to anything else.
Most agencies don't need 200 integrations. They need the 10 to 15 that actually touch their daily workflow. That's what Wave Runner was built around.
Support and Onboarding
Synthflow's lower-tier plans get ticketing support only. New users get Slack access for 30 days, then it's revoked. Enterprise customers get a dedicated Slack channel. Multiple Trustpilot reviews (one-star) call out support response times and unanswered tickets. One reviewer described submitting a billing dispute and waiting three weeks with no resolution.
Wave Runner gives every partner a private Slack channel and a dedicated account manager from day one. No 30-day expiration. No tier gating. The AM handles onboarding, troubleshooting, and ongoing account support.
When a client's voice AI agent goes down at 9 PM and their next campaign call is at 8 AM, you need someone in Slack. Not a ticketing queue with a 72-hour SLA.
When Synthflow Might Fit
Synthflow holds SOC 2, HIPAA, PCI DSS, GDPR, and ISO 27001 certifications. Relevant if your clients require those specific compliance frameworks.
200+ claimed integrations versus 13 native. Relevant if your agency depends on niche CRMs not in Wave Runner's integration set.
Pay-as-you-go with no platform fee. Lower upfront cost for single-client testing under 2,000 min/mo without white-label.
~420ms latency available as a paid add-on ($0.04/min extra).
Where Wave Runner Wins
White-label is included. $0 extra for full white-label branding, custom domain, your logo, client-facing dashboards with your brand. Synthflow charges $2,000/mo for the same capability.
Pricing is predictable. $999/mo plus $0.10/min. One line item for the platform, one rate for usage. No stacking voice engine, LLM, telephony, and latency add-ons to calculate your real cost.
Every partner gets a private Slack channel and a dedicated account manager. Not gated behind enterprise pricing. Not revoked after 30 days.
Above 5,000 minutes per month with white-label, Wave Runner costs less than Synthflow at every volume tier. The gap widens as volume grows.
No per-agent pricing. No workspace caps. Onboard your 50th client at the same platform cost as your first.
FAQ
Is Synthflow or Wave Runner cheaper?
It depends on volume and white-label needs. Synthflow costs less for low-volume testing without white-label (under 2,000 min/mo). With white-label, Wave Runner is cheaper at every volume level above 5,000 minutes per month. At 20,000 minutes, Wave Runner saves $2,000 to $3,800/mo compared to Synthflow with white-label.
Does Synthflow include white-label?
No. Synthflow's white-label access requires their Agency plan, which costs $2,000/mo on top of per-minute usage fees. Lower-tier plans do not include white-label branding or sub-account management. Wave Runner includes full white-label (custom domain, branding, client dashboards) in the base $999/mo price.
Can I use Synthflow without developers?
Yes. Synthflow has a no-code drag-and-drop builder for creating voice AI agents. Simple call flows work well in the visual editor. Users report the builder becomes "rigid" with complex multi-step flows, conditional logic, and advanced branching. Wave Runner is also no-code, with guided setup that deploys in under an hour.
How does Synthflow's latency compare to Wave Runner?
Synthflow averages around 420ms with their paid low-latency add-on ($0.04/min extra). Without the add-on, latency is higher. Wave Runner delivers sub-800ms latency included in the base price, no add-on required. Synthflow's lower number requires an extra per-minute charge. Wave Runner's included latency is the better value for agencies watching per-minute costs.
What if I'm already on Synthflow?
Migration is straightforward. Wave Runner's onboarding team handles the transition during your first week. You can run both platforms in parallel during the switch. Most agencies migrate existing call flows, knowledge bases, and phone numbers within a few days. Book a discovery session to map out the migration path.
The Bottom Line
Synthflow is an option for agencies testing voice AI at low volume without white-label needs, or agencies where SOC 2 and HIPAA certifications are non-negotiable.
Wave Runner works for agencies building voice AI into their service offering. White-label included, predictable pricing, unlimited scale, and support that doesn't disappear after 30 days.
If you're running (or planning to run) voice AI for more than a handful of clients, the math favors Wave Runner.
Book a discovery session to see the platform and get a cost comparison for your specific client volume.