Key takeaways
On Synthflow’s official pricing page (checked November 2026), self-serve monthly tiers have been retired for new customers in favor of annual enterprise contracts starting at $30,000 per year.
Synthflow campaigns are created through its Platform API and scoped over weeks with forward-deployed engineers, and its calling windows run on the agent’s single time zone rather than each lead’s local area-code time zone.
We found no documented multi-number rotation pool or automated pre-dial Federal/State DNC and TCPA litigator scrubber in Synthflow’s public documentation.
Outbound System starts at a flat $1,499/month on strict month-to-month terms ($0 annual lock-in), with 5,000 to 20,000 monthly calls, 50 to 200 local area-code numbers, pre-dial DNC scrubbing, and per-lead local time zone scheduling built in.
Updated November 4, 2026. All Synthflow pricing and documentation facts were verified directly against synthflow.ai/pricing and docs.synthflow.ai in November 2026.
How much does Synthflow cost in 2026?
As of November 2026, Synthflow’s official pricing page states that new contracts start at $30,000 per year on an annual enterprise agreement, scoped through its sales team and deployed over several weeks by forward-deployed engineers. Synthflow’s legacy low-cost self-serve plans ($29 to $450/month) are no longer available to new customers on its pricing page.
If you are looking for a ready-to-run AI voice agent platform that does not require a $30,000 annual contract lock-in or an API implementation project, Outbound System starts at a flat $1,499 per month (5,000 calls/mo), $2,499 per month (10,000 calls/mo), and $3,999 per month (20,000 calls/mo) on strict month-to-month terms with $0 setup fee.
Who Should Pick Synthflow vs. Who Should Pick Outbound System?
Following a transparent comparison standard, here is who each platform fits best in 2026:
Decision Factor | Pick Synthflow ( | Pick Outbound System If... |
|---|---|---|
Contract & budget | You are an enterprise procurement team ready to sign a $30,000+/year annual contract upfront. | You want month-to-month flexibility ($1,499 to $3,999/mo) where we earn your renewal every 30 days. |
Deployment model | You want forward-deployed engineers to scope a multi-week custom project and trigger calls via the Platform API. | You want a turnkey revenue engine with pre-tested scripts, 50 to 200 local numbers, and 15-second speed-to-lead live in days. |
Outbound telecom | You are primarily routing inbound calls on a single verified caller ID in one time zone. | You are running nationwide outbound speed-to-lead, qualification, and reactivation across 191 area codes and local time zones. |
Compliance & data | Your internal legal and engineering teams manage DNC lists and time-zone filtering via API. | You want pre-dial Federal/State DNC + TCPA litigator scrubbing (22.3% blocked) and per-lead local time windows built in. |
Synthflow vs. Outbound System: 2026 Pricing & Capability Table
Feature / Pricing Dimension | Synthflow (2026 Enterprise Model) | Outbound System (Starter / Growth / Scale) |
|---|---|---|
Published starting price | From $30,000 / year ( | $1,499 / $2,499 / $3,999 per month |
Contract commitment | Annual enterprise agreement | Month-to-month (10 business days’ notice, $0 setup) |
Monthly call capacity | Custom-scoped per annual contract | 5,000 / 10,000 / 20,000 calls/month ($0.20-$0.30/call) |
Local number rotation pool | Single purchased/verified caller ID (no pool documented) | 50 / 100 / 200 local numbers included (10 dials/day cap) |
Pre-dial DNC & litigator scrub | Not documented in public docs | Automatic before every dial (58,230 of 260,965 blocked) |
Multi-state calling hours | Runs on the agent’s single time zone | Schedules every call in the lead’s own local time zone |
Apple iOS 18 screener handling | Not published | 32,412 iOS screeners handled (1,220 live calls rescued) |
Live phone demo before buying | Must book an enterprise sales scoping call | Call your own cell phone in 15 seconds live on our site |
4 Reasons Buyers Search for Synthflow Alternatives in 2026
Searches for “synthflow alternatives” jumped to 1,300 US searches per month in September 2026 for four specific reasons:
1. The $30,000/Year Minimum Contract Barrier
Most growth-stage B2B companies, home-services operators, mortgage lenders, and marketing agencies want to prove ROI on live leads in Month 1 before committing thirty grand. Locking into a $30,000 annual contract before hearing how the voice handles your real prospects puts 100% of the financial risk on the buyer. Outbound System is strictly month-to-month starting at $1,499/mo.
2. Single Caller ID vs. 191-Area-Code Number Rotation
Synthflow’s documentation requires a single purchased or verified caller ID per agent and does not document an automated local number rotation pool. As we proved across 442,408 production calls in our carrier spam-flag study, dialing more than 10 to 15 prospects a day from a single number triggers “Scam Likely” flags and drops pickup to 1.4%. Outbound System rotates calls across 50 to 200 dedicated local numbers capped at 10 dials per number per day.
3. Agent Time Zone vs. Each Lead’s Local Area-Code Time Zone
In Synthflow’s documentation, calling windows run on the agent’s time zone. If your agent is set to Eastern Time and dials a California lead at 8:30 AM ET, that prospect’s phone rings at 5:30 AM PT, violating state calling-hour rules and burning your brand (see our 2026 TCPA & AI calling compliance guide). Outbound System resolves every prospect’s local time zone from their area code and ZIP before placing a single dial.
4. Script Hallucinations vs. Pre-Launch Coordinator Shield Guardrails
Multiple Synthflow reviewers on Trustpilot note that unguarded LLM prompts can deviate from instructions and invent pricing promises on live calls. Outbound System enforces pre-launch script linting, 6-step CRM company name normalization, and our Coordinator Shield script psychology framework, holding Do Not Call opt-outs to 0.27% across 442,408 dials.
See our dedicated comparison page at /comparison/synthflow and our 4-platform teardown of Retell vs. Vapi vs. Bland vs. Synthflow.
Frequently asked questions
Does Synthflow still have a $29 or $99 per month plan in 2026?
No. As of November 2026, Synthflow’s official pricing page states that new deployments are sold as enterprise annual contracts starting at $30,000 per year, scoped with their sales team.
How does Synthflow’s “sub-100ms” latency claim compare to real turn-taking?
Synthflow’s sub-100ms figure refers to telephony network transport, not the total conversational turn-around time after a human finishes speaking. Across 442,408 production calls, Outbound System’s phone-native voices (John and Eric) deliver sub-300ms conversational responses and hold “Are you an AI?” questions under 0.80% (see the psychology of AI voice selection).
What is the best month-to-month Synthflow alternative?
Outbound System ($1,499 to $3,999/month, strictly month-to-month with $0 setup fee) is the top month-to-month alternative to Synthflow. Test our live AI caller on your own phone or book a demo today.
Outbound System
Fixed monthly price, local numbers, and you approve every script. Hear real calls before you decide.
Matthew Johnson is the founder and CEO of Outbound System, which runs cold email, LinkedIn outreach and AI calling for 1,000+ active clients. He has personally sold over $12 million in outbound services, and his team has sent 52 million+ cold emails and helped clients close $26 million in revenue.
About Outbound System
Outbound System runs done-for-you cold email, LinkedIn outreach and AI calling for growing businesses. 1,000+ active clients and 10,400+ campaigns launched.
