The short version
Synthflow is a no-code platform for building AI phone agents, sold on monthly subscription tiers. It's a good fit if voice is all you need and a fixed monthly plan works for you.
How they compare
| CustomWeb | Synthflow | |
|---|---|---|
| Channels | Phone + web chat + SMS — one agent, one knowledge base | Voice-focused |
| Pricing model | Pay-as-you-go: a small per-minute / per-message fee, everything else at provider cost. No subscription. | Monthly subscription tiers |
| Free to start | $1 in credits, no card required | Plan-dependent |
| Bring your own provider keys | Yes — OpenAI, ElevenLabs, Deepgram and more (spend no tokens) | Plan-dependent |
| White-label / reseller | Built-in — your brand, your pricing, client portal | Higher tiers |
| Languages | Multilingual agents + full EN/DE interface | Multilingual |
Comparison reflects each platform's public positioning as of 2026 — check vendor sites for current details.
Features compared
| CustomWeb | Synthflow | |
|---|---|---|
| Phone (voice) | ||
| Free phone number | Paid | |
| Web chat | ||
| SMS / text | ||
| No-code builder | ||
| Calendar booking built in | — | |
| White-label / reseller | Higher tiers |
Pricing compared
CustomWeb
- Entry price
- $0.03 / min voice · $0.003 / msg chat & SMS — provider usage at cost
- Subscription
- None — pay as you go
- Free to start
- $1 in free credits + a phone number, no card
One flat orchestration fee; LLM, voice, and telephony pass through at provider cost. Every account includes one phone number for testing.
Synthflow
- Entry price
- Reportedly ~$0.09 / min (not officially published)
- Subscription
- Enterprise tiers (from ~$30,000/yr listed)
- Free to start
- Not listed
Mostly sales-gated — the public page lists only enterprise plans.
Competitor pricing is each vendor's published rate as of June 2026 (or "contact sales" where none is listed) — check their site for current pricing. CustomWeb's rates are fixed and shown in full.
Why teams pick CustomWeb
One agent, every channel
Phone, website chat, and SMS share one knowledge base and one wallet — teach it once, it answers everywhere.
No subscription
Pay only for what you use. A flat orchestration fee per minute and message; provider usage at cost.
You own the build
Build your agent in the no-code builder; we host the real-time infrastructure behind it.
Who each is best for
CustomWeb is best for
Businesses that want one assistant across phone, chat, and SMS without a monthly commitment.
Synthflow is best for
Teams that only need voice and prefer a fixed monthly plan.