Synthflow alternatives
If Synthflow's current pricing page wasn't what you expected, here's what it says. Enterprise contracts start at $30,000 a year, scoped around call volume, concurrency, telephony and integrations (checked 24 September 2026). For a business that needs its phone answered and its calendar filled, here's the field that sells by the month.
| Service | Bills by | Entry price | Overage published? |
|---|---|---|---|
| GreetKeeper | Answered call | $49 for 200 calls | Yes, $0.45 a call |
| Smith.ai | Per call | Free tier at $0 for 25 calls, then $3.00 a call | Yes |
| Ruby | Per minute | $250/mo for 50 minutes | No |
| Rosie | Per minute | Professional $49/mo for 250 minutes | No |
| Goodcall | Per unique caller | Starter $79/mo ($66 annual) for 100 unique customers | Yes |
| Synthflow | Annual enterprise contract | Enterprise contracts from $30,000 a year | No |
Read from each vendor's own pricing page in September 2026, except vendors who gate pricing behind a form. Check before you buy.
What GreetKeeper does differently from Synthflow
Every line below is on our pricing page or in the product today.
Why teams switch to GreetKeeper
- GreetKeeper is sold by the month: $49 for 200 answered calls, $149 for 750 and $349 for 2,000.
- Annual billing is optional and gives two months free, so a year of Starter is $490.
- You set it up yourself, starting from a draft GreetKeeper builds from your website's hours, services and FAQs.
- Calls that arrive together are answered at the same time, and each answered call counts once toward your plan.
- Booking into Google Calendar or Outlook comes on every plan, and a transfer that isn't picked up tries a second number you nominate.
- A signed webhook posts each call's outcome, summary and caller details to a URL your developer sets.
Why people leave Synthflow
Not a general complaint about the category. The specific wall this vendor puts in front of you.
Synthflow's pricing page is written for enterprise buyers: contracts from $30,000 a year, with implementation, onboarding, testing and launch support scoped into the deal. A dental office, a plumber or a small law firm has no use for a telephony plan or a concurrency review. What they want is a greeting, a calendar and a transfer number, set up by the person who owns the phone, and billed like any other monthly tool.
What the bill does as you grow
The entry price is the cheapest month you will ever have. This is the shape of the rest.
Synthflow scopes price by call volume and concurrency inside the contract, so the bill is settled at signing. GreetKeeper's meter is printed instead. $49 covers 200 answered calls, $149 covers 750 and $349 covers 2,000, and each extra call costs $0.45, $0.35 or $0.25. Calls that arrive together are answered side by side, and you pay per answered call, whatever the concurrency.
What moving off Synthflow actually involves
Forwarding takes five minutes. Here is the part that takes an afternoon.
Moving an agent off Synthflow means rebuilding its script, not its code. Copy out the prompt, the FAQ answers and the transfer rules your agent uses today. In GreetKeeper, start from the draft it builds from your website, then paste those rules in. Forward your number to GreetKeeper's dedicated local number: the ring count is set where the forwarding is set, and GreetKeeper answers the moment the call arrives. If a developer wired your old agent into a CRM, GreetKeeper's signed webhook posts each call's outcome and summary to the URL they choose.
Common questions
What is a Synthflow alternative for a small business?
A ready-to-run AI receptionist sold by the month. GreetKeeper is $49 for 200 answered calls, with booking included. Rosie and Goodcall also sell monthly plans. Developer platforms such as Vapi, Retell and Bland bill by the minute, for teams building their own agent.
What should I copy out of Synthflow before I leave?
Your agent's prompt, its FAQ answers, the transfer rules and any call recordings you want to keep. The prompt and FAQs become the first draft of your GreetKeeper script. Check your contract's notice terms before you pick a date.
How is GreetKeeper billed?
Monthly, by plan, with annual billing at two months free. There's no setup fee, and every plan starts with a 14-day free trial with every feature on and no card. Overage is printed: $0.45, $0.35 or $0.25 a call by plan.
A receptionist, not a project
Every plan and overage rate is printed. Try any plan free for 14 days.