Synthflow AI pricing

About

Synthflow AI is a no-code platform for building AI voice agents that automate phone conversations at scale — answering, routing, qualifying, and booking across customer service, receptionist, and contact-center use cases. Founded in 2023 by brothers Albert and Hakob Astabatsyan together with Sassun Mirzakhan-Saky, the company positions itself as an enterprise AI voice platform and says it powers more than 65 million voice calls per month across 30+ countries, with 1,000+ G2 reviews.

In June 2025 Synthflow raised a $20M Series A led by Accel (with Atlantic Labs and Singular), bringing total funding to roughly $30M, and reportedly reached around $1.1M revenue with a roughly 10-person team. That enterprise repositioning is reflected directly in pricing: the company has retired its cheap flat subscription tiers for new customers and moved to a usage-based, per-minute model plus a quoted Enterprise plan.

For the most current information, visit Synthflow.

Pricing summary : How Synthflow’s pricing model works

Synthflow now sells two paths. Pay As You Go carries no platform fee — you build agents for free and pay only when calls run. The bill is the sum of three per-minute meters: the Synthflow Voice Engine at $0.09/min, your chosen LLM (GPT-4.1 mini $0.02/min, GPT-5/5.1/5.2 $0.04/min, GPT-4.1 $0.05/min, or bring your own), and telephony (Synthflow-managed Twilio $0.02/min, or $0.00 if you bring your own Twilio). All-in, that composes to a low double-digit-cents-per-minute rate depending on configuration. PAYG includes 5 concurrent calls, then $20/month per reserved concurrency (up to 50), plus optional add-ons like Performance Routing and Global Low-Latency Edge ($0.04/min each) and White-Label ($2,000/month).

Enterprise is custom-quoted for teams handling 10,000+ minutes/month (annual commitment). It folds in a 99.99% SLA, native telephony and SIP trunking, unlimited concurrency, the white-label/reseller toolkit, HIPAA and advanced compliance (MSA, geo-based sub-processing, on-premise multi-region), and dedicated support with a solution architect and CSM.

What makes this different: Synthflow unbundles the cost into composable per-minute meters (voice + LLM + telephony) rather than a single blended rate — and it deliberately walked away from low-end flat tiers. The old Starter / Pro / Growth / Agency flat subscriptions (see Pricing evolution) are grandfathered for existing customers but gone for new signups.

Pricing by product

Legacy flat tiers — grandfathered for existing customers and no longer sold to new signups — were Starter (50 minutes), Pro (2,000 minutes), Growth (4,000 minutes, 50 concurrency, 25 subaccounts) and Agency (6,000 minutes, 80 concurrency, unlimited subaccounts), each with overage in the low-teens of cents per minute (see Pricing evolution for the historical figures).

Sales motions across products: self-serve PLG for Pay As You Go (free to start, instant agent building) and sales-led for Enterprise. Phone numbers are $1.50 each on PAYG and included on Enterprise. Text channels (API, widget, SMS, WhatsApp) bill at 5 messages = 1 minute of voice usage.

Hidden costs : What Synthflow users actually pay

The “$0.09/min” headline is only the voice engine — the real per-minute cost is a stack. Add the LLM and telephony meters and a typical agent runs $0.11–$0.24/min before any add-ons. The pricing page’s own calculator illustrates the build-up: Voice Engine $0.09 + GPT-4.1 $0.05 + native telephony = ~$0.14/min in its default example.

Other things to budget for: concurrency beyond the 5 included calls is $20/month per reserved slot (up to 50), phone numbers are $1.50 each, white-label/reseller is $2,000/month on PAYG, and HIPAA, 99.99% SLA, and native telephony are Enterprise-only. Because there is no included-minute floor on PAYG, light usage is cheap but high-volume callers are steered toward an Enterprise annual commitment.

Want to estimate your own Synthflow bill? Use the Synthflow pricing calculator to model your costs based on usage patterns.

Pricing evolution : Synthflow pricing history and changes

Cadence

Tracked range: 2024–present. Live capture 2026-06-09; legacy tier detail corroborated by third-party pricing write-ups (Wayback access was blocked at capture time, so historical snapshot metadata is left empty rather than guessed).

Notable changes

• 2024 — Sells flat subscription tiers: Starter $29/mo (50 min), Pro $375/mo (2,000 min, $0.13 overage), Growth $750/mo (4,000 min, $0.12 overage, 50 concurrency, 25 subaccounts), Agency $1,250/mo (6,000 min, $0.12 overage). 14-day free trial; $1.50/mo per phone number.
• 2025-06 — Raises $20M Series A led by Accel (~$30M total); pivots messaging toward enterprise-grade voice agents.
• 2026 — Replaces flat tiers with Pay As You Go (no platform fee — $0.09/min Voice Engine + LLM $0.02–$0.05/min + telephony $0.00–$0.02/min; 5 concurrency included, then $20/mo each) and custom Enterprise (10K+ min/mo). Legacy Starter/Pro/Growth/Agency grandfathered for existing customers.

What’s unique : Synthflow’s distinctive pricing mechanics

1. Composable per-minute meters, not a blended rate. Synthflow bills the Voice Engine, the LLM, and telephony as three separate per-minute lines. Buyers can dial cost up or down by swapping the model (GPT-4.1 mini vs full GPT-4.1) or bringing their own Twilio ($0.00 telephony) — transparency most voice-AI vendors hide behind a single number.

2. No platform fee on the entry path. Pay As You Go removes the monthly subscription entirely — you only pay for minutes consumed. That eliminates the “shelfware” risk of a flat plan and makes pilots genuinely $0 to start.

3. Deliberately dropping the low end. Most platforms add cheaper tiers over time; Synthflow did the opposite, retiring its $29 Starter and pushing serious volume toward a quoted Enterprise commitment. Concurrency is sold à la carte ($20/month per call) rather than bundled, which keeps the entry price low but meters scale separately.

Strengths & weaknesses

Billing UX : Synthflow billing controls and transparency

• Billing controls — Pay As You Go is self-serve with no platform fee; you add reserved concurrency ($20/month each, up to 50) and add-ons as needed. Enterprise is invoiced under an annual commitment with an MSA. Existing legacy-tier customers keep their plan and price.
• Usage visibility — The pricing page ships an interactive cost calculator that lets you pick the LLM and telephony and shows a live per-minute cost breakdown (Voice Engine + LLM + telephony = total), giving strong forward visibility into the composed rate before you commit.
• Payment options — Self-serve card billing for Pay As You Go; Enterprise is contract/invoice-based with custom terms (geo-based sub-processing, flexible hosting, on-premise multi-region). Phone numbers bill at $1.50 each; failed-call and minute-rounding rules are covered in Synthflow’s billing FAQ.

Strategic wins : Why Synthflow’s pricing decisions worked

1. Removing the platform fee to win pilots

By making Pay As You Go free to start with no monthly subscription, Synthflow lowers the barrier for builders and pilots to ship an agent and only pay once real calls run. This aligns cost with realized value and removes the friction of committing to a flat plan before proving ROI. See how AI companies structure pricing.

2. Unbundling the cost stack

Exposing voice, LLM, and telephony as separate per-minute meters lets buyers optimize their own rate (cheaper model, BYO telephony) and builds trust through transparency — a sharp contrast to competitors that quote a single opaque per-minute number. Related: outcome-based pricing trends.

3. Steering volume toward Enterprise

Retiring the cheap flat tiers and routing 10,000+ minute/month callers into a quoted, annual-commitment Enterprise plan captures more value from the accounts that matter post-Series A. See choosing the right usage metric.

Areas to improve : Gaps in Synthflow’s pricing approach

1. The all-in cost is easy to under-estimate

Because the bill is the sum of three meters plus optional add-ons and per-call concurrency, the advertised “$0.09/min” understates reality — third-party reviews report buyers feeling surprised when the real rate lands closer to $0.14–$0.24/min. Surfacing a clearer “typical all-in” number would reduce friction. See bill shock and cost unpredictability.

2. No free or included-minute floor

PAYG bills from the first minute with no perpetual free allotment. For a no-code product whose funnel depends on hobbyist experimentation, even a small monthly free-minute grant would smooth onboarding versus competitors offering free tiers.

3. Concurrency priced à la carte

Charging $20/month per reserved concurrent call beyond the included 5 can add up fast for busy lines, and it sits awkwardly next to an otherwise pure usage model — buyers must forecast peak concurrency separately from minutes.

Key takeaways

1. You can move pricing upmarket by removing tiers, not adding them. Synthflow killed its $29 Starter and pushed volume toward Enterprise after its Series A.
2. No platform fee lowers the bar to pilot. PAYG is $0 to start and bills only on real call minutes, aligning cost with value.
3. Unbundling builds trust but raises estimation risk. Separate voice/LLM/telephony meters are transparent, yet the all-in rate is easy to undercount.
4. Composability is a feature. Letting buyers swap models or bring their own telephony lets them tune their own per-minute cost.
5. Voice AI economics are converging on per-minute usage. Synthflow’s shift mirrors a broader move away from flat seat/tier plans in the conversational-AI category.

UBP implications

1. Per-minute (media-minutes) is the natural value metric for voice AI — it maps directly to what the buyer’s business produces (handled calls) and scales cleanly with usage.
2. Unbundle the cost stack when each input has a real cost driver. Splitting voice, LLM, and telephony lets customers self-optimize and makes the meter defensible — but publish a representative all-in figure to avoid bill shock. See usage-based pricing strategy.
3. Reserve fixed commitments for the high end. A no-fee usage entry plus a quoted enterprise annual commitment captures both PLG funnel and large-account value without a cheap flat tier in the middle.

Sources

• Synthflow pricing page (live capture, accessed 2026-06-09)
• Synthflow AI raises $20M Series A (Accel) (accessed 2026-06-09)
• Synthflow AI raises $20M — Yahoo Finance (accessed 2026-06-09)
• Decoding Synthflow Pricing and Plans in 2025 — Dograh (legacy tier detail, accessed 2026-06-09)
• Synthflow Pricing 2026 — PxlPeak (accessed 2026-06-09)
• Synthflow pricing in 2026 — Ringly (accessed 2026-06-09)
• Synthflow billing overview — docs (accessed 2026-06-09)
• How Synthflow AI hit $1.1M revenue — GetLatka (accessed 2026-06-09)

Bottom line

Synthflow AI is a no-code AI voice-agent builder (founded 2023, $20M Series A led by Accel in June 2025) that re-architected its pricing around per-minute usage. Pay As You Go has no platform fee — you pay $0.09/min for the Voice Engine plus an LLM rate ($0.02–$0.05/min) plus telephony ($0.00–$0.02/min), about $0.11–$0.24 all-in, with 5 concurrent calls included and $20/month per extra concurrency. Custom Enterprise covers 10,000+ minute/month teams with a 99.99% SLA, native telephony, white-label, and HIPAA. The old flat Starter/Pro/Growth/Agency tiers are grandfathered for existing customers only. Browse the pricing blueprint for more fully-researched company profiles.

Want to compare Synthflow against other voice and conversational-AI companies? Browse the pricing blueprint.

Pricing timeline : Major events on a vertical axis

Each milestone below corresponds to a public pricing change, product launch, or material adjustment. Major events use a filled marker; minor adjustments use a faded one.

Pay-as-you-go usage model replaces flat tiers

Jun 2026

Pricing page now shows two paths: Pay As You Go (no platform fee — $0.09/min Voice Engine + LLM $0.02–$0.05/min + telephony $0.00–$0.02/min ≈ $0.11–$0.24 all-in; 5 concurrent calls included, then $20/mo per reserved concurrency) and custom Enterprise (10,000+ min/mo, 99.99% SLA, native telephony/SIP, unlimited concurrency, white-label, HIPAA). Legacy Starter/Pro/Growth/Agency tiers grandfathered for existing customers.

$20M Series A (Accel) — enterprise repositioning

Jun 2025

Raised a $20M Series A led by Accel (with Atlantic Labs and Singular), ~$30M total funding, and repositioned around enterprise-grade AI voice agents. This precedes the shift away from low-end flat tiers toward usage-based and enterprise pricing.

Flat monthly tiers — Starter/Pro/Growth/Agency

Jun 2024

Synthflow sells flat subscription tiers with bundled minutes: Starter $29/mo (50 min), Pro $375/mo (2,000 min, $0.13/min overage), Growth $750/mo (4,000 min, $0.12 overage, 50 concurrency, 25 subaccounts), Agency $1,250/mo (6,000 min, $0.12 overage, 80 concurrency), plus custom Enterprise. 14-day free trial; $1.50/mo per phone number.