GreetKeeper vs Synthflow
Synthflow sells enterprise voice AI, and its pricing page says contracts start at $30,000 a year (checked 24 September 2026). GreetKeeper is a ready-to-run AI receptionist for a business that answers its own phone, at $49 a month for 200 answered calls. You pick a plan and forward a number; there's no scoping phase.
| GreetKeeper | Synthflow | |
|---|---|---|
| Billing unit | Per answered call | Annual enterprise contract |
| Entry plan | $49/mo for 200 answered calls | Enterprise contracts from $30,000 a year |
| Higher tiers | $149 for 750, $349 for 2000 | Not published; scoped around call volume, concurrency, telephony, integrations and launch support |
| Overage rate | $0.45 a call on Starter, published | Not published; set inside each contract |
| Appointment booking | Included on every plan | Check current plan terms |
| Human fallback | Transfers to your team | Transfers to your team |
Synthflow figures read from their own pricing page in September 2026. Check before you buy.
Why people move off Synthflow
One vendor's specific wall, not a general complaint about the category.
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.
Where we differ
Every line below is on our pricing page or in the product today.
What GreetKeeper does differently from Synthflow
- 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.
What a busy month costs on each meter
The headline price tells you about a quiet month. This is the other one.
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.
| Plan | Monthly | Calls included | After that |
|---|---|---|---|
| StarterFor a single location taking calls one line at a time. | $49 | 200 | $0.45 per call |
| ProfessionalBooking, routing and transfers included, not an add-on. | $149 | 750 | $0.35 per call |
| ScaleFor busy phones and longer opening hours. | $349 | 2,000 | $0.25 per call |
Moving off Synthflow in practice
The technical part is a forwarding change. The rest is the part nobody warns you about.
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.
Questions people ask about this comparison
How much does Synthflow cost?
Synthflow's pricing page says enterprise contracts start at $30,000 a year, with the final price scoped around call volume, concurrency, telephony, integrations and launch support (checked 24 September 2026). GreetKeeper starts at $49 a month for 200 answered calls, and annual billing gives two months free.
Do I need a developer to run GreetKeeper?
No. You set the greeting, hours, calendar and transfer numbers yourself, starting from a draft GreetKeeper builds from your website. A developer only comes in if you want the webhook to feed another system.
Can GreetKeeper answer calls that arrive at the same time?
Yes. GreetKeeper answers calls that arrive together at the same time, so nobody queues. The usual ceiling is your own phone line's channel limit, and each answered call counts once toward your plan.
Skip the scoping call
Pick a plan, forward a number and hear it answer. 14 days free, no card.