Synthflow vs Vapi — Pricing, Plans, and Verified Costs (2026)
Synthflow starts at $29/mo. Vapi starts at Free. Vapi is $29/mo cheaper on the entry tier than Synthflow.
How pricing works
These two tools don't price the same way, so the headline numbers below aren't directly comparable until you plug in your own volume.
- Synthflow (Hybrid) — Synthflow is hybrid: a fixed subscription from $29/mo plus metered usage on top (Starter). Your real bill moves with volume, not seat count.
- Vapi (Per Usage) — Vapi bills purely on usage — PAYG. There is no fixed per-seat fee, so the monthly cost depends entirely on how much you consume.
Per-minute, per-credit and per-token rates exclude any downstream model, speech or telephony costs unless the vendor states otherwise.
No-code AI voice agent builder with tiered subscriptions + per-minute overages. Starter $29 (50 min), Pro $99 (200 min), Growth $449 (1000 min), Agency $899 (2000 min), Enterprise custom (10K+ min). White-label option runs ~$2,000/mo. Voice engine alone ~$0.09/min; all-in $0.15–0.37/min with LLM + telephony.
Voice AI agent platform for developers building conversational voice apps. Base orchestration at $0.05/minute PAYG (STT/LLM/TTS/telephony billed separately, ~$0.07–0.25/min all-in). 10 concurrent lines included; extra lines $10/mo each. HIPAA add-on $2K/mo, ZDR $1K/mo. Enterprise starts $40K–70K/year. Backed by Bessemer and Y Combinator. Direct competitor to Retell AI and Bland AI.
All plans compared
| Tier role | Plan | Synthflow monthly | Synthflow annual | Vapi monthly | Vapi annual |
|---|---|---|---|---|---|
| Free / starter | — / PAYG | — | — | Free | Free |
| Entry paid | Starter / — | $29 | $29 | — | — |
| Mid tier 1 | Pro / — | $99 | $99 | — | — |
| Mid tier 2 | Growth / — | $449 | $449 | — | — |
| Pro / power | Agency / — | $899 | $899 | — | — |
| Enterprise | Enterprise | Custom | Custom | $3333 | $3333 |
Tier names differ across vendors. Rows are aligned by tier role, not name. Full tier structures on each tool's page.
What each is best for
Synthflow is worth it if… small businesses and agencies that want no-code AI voice agents without touching a developer platform like Vapi or Retell. Starter ($29) makes prototyping cheap.
Vapi is worth it if… developers who want maximum control over the voice stack — swap any STT, LLM, TTS, or telephony provider without vendor lock-in. 05/min is the lowest orchestration fee in the category, but the real cost is what you stack on top.
Bottom line: Choose based on how you want to pay — Synthflow is hybrid, Vapi is per usage.
Choose Synthflow over Vapi if…
Choose Synthflow if…
- You're fine with a base subscription plus metered usage on top (from $29/mo).
- You match the profile Synthflow is built for: small businesses and agencies that want no-code AI voice agents without touching a developer platform like Vapi or Retell.
- You need a general-purpose voice agents & speech/audio option rather than a vertical-specific one.
Choose Vapi if…
- You want a fully open voice stack — swap STT, LLM, TTS, or telephony providers freely.
- You're a developer prioritising maximum control over opinionated defaults.
- You need HIPAA or zero-data-retention compliance without switching platforms.
Feature comparison
| AI Voice Agents | Synthflow | Vapi |
|---|---|---|
| Bring-your-own LLM | Partial | |
| Bring-your-own voice | ||
| Multilingual (5+ languages) | ||
| Inbound + outbound | ||
| Human transfer | ||
| HIPAA | ||
| SOC 2 | ||
| Self-serve signup |
Feature parity verified against vendor pricing and docs pages on September 10, 2026. Missing a feature? Tell us — we'll fact-check and update.
At a glance
| Synthflow | Vapi | |
|---|---|---|
| Free plan | No | Yes |
| Entry price | $29/mo | Free |
| Enterprise available | Yes | Yes |
| Pricing model | Hybrid | Per Usage |
| Last verified | September 10, 2026 | September 10, 2026 |
| Full pricing | View full pricing | View full pricing |
Pricing last verified September 10, 2026. Tracked daily.