Simple Phones vs Synthflow AI
Simple Phones starts $2403/mo cheaper than Synthflow AI.
Both pages checked by August 19, 2026
- Simple PhonesAI only
- $97/mo
- Basic plan
- Turnkey AI phone answering service for small businesses: Simple Phones generates a starter agent from your business details, assigns a number you forward missed calls to, and their team makes ongoing agent customizations on request rather than you building the agent yourself.
- Synthflow AIAI only
- $2500/mo
- Enterprise plan
- Enterprise voice AI platform with in-house telephony for automating inbound and outbound calls, sold through sales-scoped contracts rather than published self-serve plans, with the agent designed, tested and launched by the customer in Synthflow's Flow Designer or Prompt Builder.
Feature by feature
| Capability | Simple Phones | Synthflow AI |
|---|---|---|
| Live transfer | Yes | Yes |
| Books appointments | Yes | Yes |
| Text follow-up | Yes | Yes |
| Outbound calls | Yes | Yes |
| Spanish | Yes | Yes |
| Human backup | No | No |
| Call recordings | unstated | Yes |
| Transcripts | Yes | Yes |
| Spam screening | unstated | unstated |
| Custom voice | unstated | Yes |
| API | Yes | Yes |
"unstated" means the vendor doesn't claim it in their own documentation. It is not the same as no — it means nobody will put it in writing.
Simple Phones plans
| Plan | Published price | Includes | Over that |
|---|---|---|---|
| Basic | Simple Phones starts at $97/mo for 100 calls/mo. | 100 calls | If you cancel your plan, or you exceed the number of calls per month for your tier, your phone numbers will be released. |
| Advanced | not published | 500 calls | If you cancel your plan, or you exceed the number of calls per month for your tier, your phone numbers will be released. |
| Premium | not published | 2500 calls | If you cancel your plan, or you exceed the number of calls per month for your tier, your phone numbers will be released. |
| Pay As You Go | $0.19/min | — | — |
Synthflow AI plans
| Plan | Published price | Includes | Over that |
|---|---|---|---|
| Enterprise | Enterprise contracts start at $30,000 annually(annual billing) | — | — |
Simple Phones sources
- Pricing / features / FAQ page (renders the site's pricing and FAQ sections: $97 for 100 calls, 14-day free trial, no commitment, overage = numbers released, country list, language list, forwarding, CRM/Zapier, transfer to a team member)simplephones.ai · read August 19, 2026
- Homepage (inbound, outbound, logging, customization, routing, voices, crawling)simplephones.ai · read August 19, 2026
- In-app billing screen (tier names "Basic Subscription - 100 calls/month", "Advanced Subscription - 500 calls/month", "Premium Subscription - 2,500 calls/month"; Pay As You Go $0.19/min and its 250 minutes/month minimum; >2,500 calls or >20 agents triggers Pay As You Go; whitelabel answer)app.simplephones.ai · read August 19, 2026
- Help centre: Creating an agent (one agent on the Basic plan)help.simplephones.ai · read August 19, 2026
- Help centre: Inbound Callshelp.simplephones.ai · read August 19, 2026
- Help centre: Outbound Calls (1 call per number per 24h, callback-only unless BYO Twilio)help.simplephones.ai · read August 19, 2026
- Help centre: Routing (transfer to any number, time-of-day rules, email/text/webhook alerts)help.simplephones.ai · read August 19, 2026
- Help centre: Crawling (website/FAQ knowledge base)help.simplephones.ai · read August 19, 2026
- Help centre / API: Call Details & Transcript (response fields: minutesUsed, start/end time, transcript; no recording URL)help.simplephones.ai · read August 19, 2026
- Help centre documentation indexhelp.simplephones.ai · read August 19, 2026
Synthflow AI sources
- Pricing page (Enterprise-only; "Enterprise contracts start at $30,000 annually"; scoping variables and contract inclusions)synthflow.ai · read August 19, 2026
- Homepage (positioning, target industries, free-trial FAQ answer and PAYG statement)synthflow.ai · read August 19, 2026
- Docs: Billing Overview ("Synthflow uses sales-led pricing", legacy billing labels, do-not-quote-from-docs warning)docs.synthflow.ai · read August 19, 2026
- Docs: Usage and Billing (per-second measurement, minute aggregation with carryover, flat 5s for no-answer, call-state billing table, chat at 5 AI messages per minute, allowances and carryover)docs.synthflow.ai · read August 19, 2026
- Docs: Concurrency (concurrency vs CAPS, "Scoped with Synthflow", no published defaults)docs.synthflow.ai · read August 19, 2026
- Docs: Languages (transcribers Deepgram and Synthflow STT, full supported-language list)docs.synthflow.ai · read August 19, 2026
- Docs: Integrations overview (GoHighLevel, Salesforce, HubSpot, Zendesk, Freshworks, Cal.com, Stripe, WhatsApp, ElevenLabs, Zapier, Make, Bubble, OpenAI/Anthropic/Azure BYOK, telephony)docs.synthflow.ai · read August 19, 2026
- Docs: Logs (call recordings and transcripts, live monitoring, CSV export, opt-out of saving recordings)docs.synthflow.ai · read August 19, 2026
- Docs: Getting started (BELL framework — the customer builds, evaluates and launches)docs.synthflow.ai · read August 19, 2026
- Docs: Custom pricing / reseller plans (Stripe reselling deprecated September 15, 2026; configurable subaccount plans, included minutes, concurrency caps, trials up to 200 minutes)docs.synthflow.ai · read August 19, 2026
- Docs index (call transfer TEL/SIP/dynamic, real-time booking, post-call SMS, in-call SMS/WhatsApp messaging, campaigns/batch calling, IVR handling, telephony and SIP integrations, Platform API)docs.synthflow.ai · read August 19, 2026
- Imprint (operating entity AgentFlow AI GmbH, Kurfürstendamm 15, 10719 Berlin; HRB 255004 B)docs.synthflow.ai · read August 19, 2026