cyberstaff

The best Synthflow alternatives for UK businesses in 2026.

Synthflow gives you the toolkit to ship your own AI voice agent — which is exactly the point, and exactly the catch: the design, the integrations and every later tweak land on your plate, billed in US dollars, with no UK human on the other end. We benchmarked the leading done-for-you options on setup effort, predictability and price, so you can decide whether to wire one up yourself or hand the whole thing off.

John Oberlin-Harris

Written by John Oberlin-Harris

CRO, Cyberstaff

Last updated 16 July 2026

The quick verdict

If you enjoy shipping infrastructure, want to own every layer of the stack and don’t mind tuning a voice agent as you go, Synthflow is genuinely flexible and cheap on a per-minute basis. If you’d rather skip the build entirely — a receptionist live in under 60 seconds, run for you, at one flat monthly figure — then a done-for-you AI receptionist is the buy-not-build option. For most UK trades and SMBs that means Cyberstaff, from £30 a month: it reads your website, fields calls 24/7 and books into your diary, with zero assembly required.

Why businesses look beyond Synthflow

A solid toolkit — but the engineering work is on you.

You ship it and you own it

Synthflow gives you the building blocks, not a finished agent; writing the prompts, wiring the call flows and tuning them is your work today, and it stays your work tomorrow.

Usage pricing is hard to forecast

The advertised per-minute figure sits on top of separate LLM and telephony line items, so the number that lands on your invoice is anyone’s guess.

Scaling lines and white-label adds up

Push past the bundled concurrent lines and you’re paying roughly $20 each, while white-label deployment runs into the thousands a month.

No UK human in the loop

This is a self-serve platform end to end — there’s no UK team to stand it up for you, fine-tune it or take responsibility when something breaks.

Bring your own telephony and keys

You connect and manage your own telephony and model accounts, so phone numbers, integrations and the bills behind them are yours to set up and maintain.

Billing model in flux

Synthflow swapped fixed tiers for usage-based billing and some customers pushed back on the shift, so pin down the live rates before you commit.

What to look for in an alternative

What to pressure-test before you commit to building.

  1. 1

    Buy, don’t build. A receptionist that already works, not an empty canvas to wire up.

  2. 2

    One predictable flat bill. No per-minute, LLM and telephony charges piling on top of each other.

  3. 3

    A UK team behind it. Real people to configure it and own the outcome.

  4. 4

    Minutes to launch, not a sprint. It should learn your business and go live fast.

At a glance

Synthflow and six alternatives, side by side.

Provider From Overage 24/7 Setup Min term Rating Notes
Cyberstaff Customisable AI £30/mo £0.30/min ✓ Included Included Rolling monthly 4.6 Trustpilot
Moneypenny Customisable AI £99/mo £2.20/call ✓ Included £250 4 months 4.8 Trustpilot Some changes chargeable @ £70/hour
Moneypenny Virtual Receptionist £282/mo £2.25/min +£150/mo Included 4 months 4.8 Trustpilot
Reception HQ Virtual Receptionist (My Assistant) £99/mo £1.10/min ✓ Included From £20 Rolling monthly 3.2 Trustpilot
AnswerConnect Virtual Receptionist £168.75 £1.75/min ✓ Included £49.99 Rolling monthly 4.9 Trustpilot Transcripts @ +£30/mo, Transfer @ +£30/mo
AllDayPA Virtual Receptionist £123 £1.34/min ✓ Included Included 3 months 4.8 Trustpilot
JAM Virtual Receptionist £109.60 £1.15/min ✓ Included Included 4 months 4.6 Trustpilot + post call transcription costs
Face for Business Inclusive Minutes Plan · Virtual Receptionist From £189/mo Not stated Not available Included 4 months 5.0 Verified Trusted No charge for sales/nuisance calls

Based on 100 minutes/50 calls minimum using cheapest published/quoted plan. As of June 2026. Trustpilot ratings used where found, otherwise first ranking independent review site from Google search with ≥5 reviews.

The alternatives, ranked

Six Synthflow alternatives, each with the straight case for it.

1

Cyberstaff AI

Best for: Small businesses looking for instant set up, great support and market leading pricing

From £30/mo

100 mins then £0.30/min

A UK based AI receptionist that configures a bespoke AI receptionist based on a 1 minute website scan. Rated Excellent on Trustpilot with great reviews and a growing list of integrations, but newer on the block.

Flat pricing, 24/7 included on every plan

Answers unlimited calls at once, no queue

No setup fee, cancel anytime

Reads your website and is live in under 60 seconds

Newer brand than the incumbents

Built for inbound, not large outbound campaigns

4.6 Trustpilot

The recent reviews for Cyberstaff are overwhelmingly positive, with users giving the company a 5-star rating for its AI receptionist service. Reviewers consistently praise the tool for sounding natural, saving them hours of admin work, and efficiently handling customer bookings and calls while they are busy.

2

AnswerConnect Human

Best for: Businesses wanting human receptionists with 24/7 included

From £168.75/mo

100 mins then £1.75/min

A long-standing human answering service that bundles round-the-clock and bilingual cover as standard, and carries the highest Trustpilot score in this field. The catch is per-minute pricing that mounts as volume grows and most plans have a £49.99 set up fee.

24/7 human cover included as standard

App to manage and integrations with many popular CRMs

Excellent 4.9 Trustpilot from over 200 reviews

Over 5 times the price of leading AI agent options and £49.99 set up fees

Per-minute rates are towards the higher end at £1.75/min

Transcripts and Transfers each come with a £30/month add on price

4.9 Trustpilot

Recent reviews for AnswerConnect UK are overwhelmingly positive, with customers highly praising the supportive customer service team, smooth onboarding processes, and quick, professional call handling. While the service is widely described as reliable and highly effective at filtering calls, a minor critique notes that it can be quite expensive.

3

AllDayPA Human

Best for: UK firms wanting a human team and willing to commit for long term

From £123/mo

100 mins then £1.34/min

A Manchester outfit that has been at it since 1999 and claim to cover a number of sectors including Business Support and Finance. Provides 24/7 service as standard.

UK-based human receptionists

Can handle web chat and email management as additional services

Strong 4.8 Trustpilot for staff friendliness

Pricing not published and sits behind a quote form

90-day notice period to terminate in the Terms and Conditions

Weaker review score on Google Reviews (3.7)

4.8 Trustpilot

Recent reviews for AllDayPA are overwhelmingly positive, with clients consistently praising the team's professional, reliable, and friendly call handling that seamlessly extends their own business operations. Reviewers frequently highlight their prompt communication, quick turnaround times, and exceptional long-term support spanning over many years.

4

Moneypenny Human or AI

Best for: Businesses wanting a hybrid human/AI service and willing to pay a premium for it

From £282/mo (human), £99/mo (AI)

100 mins then £2.25/min (human) or £2.20/call (AI)

One of the best-known UK answering services, with a strong name, a decent app and a hybrid human/AI service. But 24/7 costs extra, the included minutes are lower than others, overages are among the highest in the market and there's a minimum 4 month term.

Well-known UK brand with a polished app

High 4.8 Trustpilot score

Use of a dedicated group of agents

Overages high at £2.25 per minute

24/7 costs around £150/mo extra

Four month or longer contracts

4.8 Trustpilot

Recent reviews overwhelmingly praise Moneypenny for its exceptionally friendly, professional, and reliable staff, with many customers noting that the team acts as a seamless extension of their own business. While the feedback is highly positive, a rare minor complaint noted an issue with incorrect account settings that resulted in zero work being carried out.

5

Reception HQ Human

Best for: Businesses looking for a great value human agent option and 24/7 coverage included as standard

From £99/mo

100 mins then £1.10/min

UK receptionists handle the weekday calls, with offshore teams taking the after-hours shift so 24/7 comes built in, all billed by the second and free of any contract. A neat fit for overflow and seasonal spikes, though reviews do flag the odd billing and cancellation snag.

24/7 included, no after-hours surcharge

No lock-in, 7-day free trial

Per-second billing, no minute rounding and some of the lowest rates for human agents

Out of hours and surge calls are answered off shore

Small number of mainly negative reviews on Trustpilot

A human handles one call at a time

3.2 Trustpilot

The page currently has only one review, which gives the company a 1-star rating. The reviewer strongly advises against using the service, warning that receptionists mispronounced or incorrectly used their company name during a trial and offered no apology for the mistake.

6

JAM Human

Best for: Businesses wanting the longest-running UK human service at a reasonable price

From £109.60/mo

100 mins then £1.15/min

The longest-established answering service in the UK, running since 1977, with dedicated PA teams, 24/7 cover at no extra charge and a 4-month minimum (a 3-month minimum plus 30 days' notice).

Long UK track record, bespoke PA teams

24/7 included at no extra charge

Transparent pricing published online

Charges for type up time on top of calls

One team, not unlimited parallel calls

Premium versus AI on cost

4.6 Trustpilot

Recent reviews for JAM are largely positive, with customers frequently praising the professional call handling, efficient support team, and the service's role as a helpful extension of their business. While most users are satisfied, a few noted minor issues regarding setup, spam call filtering, and occasional delays in administrative processes like refunds.

7

Face for Business Human

Best for: SMEs wanting UK PAs with per-second billing

From £189/mo

100 mins, overage not stated

UK-based virtual PAs, running since 2011, billed by the second with no setup fee. Evenings and weekends for an extra fee but not 24/7. A dedicated team rather than a call-centre queue, on a 4-month term.

Per-second billing, no rounding

No setup fee and no charges for sales/nuisance calls

Dedicated UK PA team, ISO 9001 accredited

Still per-time human pricing at volume and expensive minimum package of £115

No Trustpilot reviews found

24/7 coverage not available

5.0 Verified Trusted

Recent reviews overwhelmingly praise Face For Business for their professional, efficient, and friendly telephone answering service, noting that they act as a seamless extension of clients' teams. Many small business owners highlighted how the service prevents missed calls, saves time, and smoothly integrates with their existing setups.

Head to head

Cyberstaff vs Synthflow, feature by feature.

Feature Cyberstaff Synthflow
24/7 cover ✓ Included free +£75/mo add-on
Pricing model Generous bundled minutes + lowest overage rates Base + per-minute
Starting price From £30/mo From £99/mo
Included minutes/calls 100 to 600 mins/mo Variable, with premium overages
Per-minute overage 20p to 30p/min, same as contract rate £1.10 to £2.35/min
Setup fee £0 Up to £250
Minimum contract Rolling monthly 4 months with some providers
Calls at once ✓ Unlimited parallel Limited by staffing
Calendar and CRM booking ✓ Built in Mostly message taking
Call transcripts ✓ Included Often an additional charge
Time to go live Under 60 seconds Days to weeks

Pricing in the real world

What you actually pay as call volume grows.

Flat AI pricing stays low while per-minute human services climb with volume. Below is each provider on its cheapest published or quoted plan, at three usage tiers.

Monthly mins/callsCyberstaff (AI)AnswerConnect (human)AllDayPAMoneypenny (Virtual Receptionist)Moneypenny (AI Receptionist)Reception HQJAMFace for Business
100 mins (c. 50 calls) £30/mo +£0.30/min£168.75/mo +£1.75/min£123/mo +£1.34/min£282/mo +£2.35/min£99/mo +£2.20/call£99/mo +£1.10/min£109.60/mo +£1.15/min£189 +£2.00/min
300 mins (c. 150 calls) £75/mo +£0.25/min£332.50/mo +£1.75/min£369/mo +£1.34/min£679.50/mo +£2.09/min£260/mo +£1.90/call£265/mo +£1.10/min£309.60/mo +£1.15/min£465 +£1.70/min
600 mins (c. 300 calls) £120/mo +£0.20/min£692.50/mo +£1.75/min£738/mo +£1.34/min£1,298/mo +£2.09/min£489/mo +£1.80/call£505/mo +£1.10/min£618/mo +£1.09/min£875 +£1.70/min
Additional fees/notes Simple pricing inc. full transcripts and transfers+£30/mo for transcripts +£30/mo for transfers+£150/mo for 24/7 coverage£250 set up feeSet up from £20 depending on complexityType up time charged on top of call time.

Data from published plans or quotes provided by email as at June 2026.

The honest take

Where Synthflow is the right call.

A comparison that never concedes a point isn’t worth your time. Synthflow is the one to reach for when:

You’re technical and want the keys to everything. Own the prompts, call flows, voice and LLM choices end to end.

You’re building for clients. White-label and an open API make it a platform for agencies and developers.

You want the rock-bottom per-minute rate. Pay only for usage, if you are happy to assemble the pieces yourself.

You need many languages or bespoke flows. 30+ languages and deep branching suit bespoke, non-standard use cases.

Switching from Synthflow

Trade the build for a receptionist that just runs.

  1. 1

    Start free, no card needed

    Spin up your account and a fresh Cyberstaff AI number is yours immediately. It scrapes your website to learn your services and area — nothing for you to wire up.

  2. 2

    Keep your number

    Point conditional forwarding from your existing business number to Cyberstaff. Customers keep dialling the number they already know.

  3. 3

    Run them side by side

    Put Cyberstaff up against your Synthflow agent for a week and weigh the calls, the bookings and the effort each one demands.

  4. 4

    Decommission the build

    Once Cyberstaff is fielding your calls, move the number across in full and stop babysitting the DIY agent.

How to choose

Choose by how your business actually fields calls.

Choose Cyberstaff

You want a done-for-you AI receptionist that’s answering within 60 seconds, run for you, at a flat UK price with no build to manage.

Choose Synthflow

You’re technical, you want the keys to the build, and you’re fine designing, integrating and maintaining your own AI voice agent.

Choose a human service

AnswerConnect, AllDayPA or Moneypenny suit you if every caller must reach a real person.

Choose Smith.ai

You want trained human agents on complex calls and deep US CRM workflows, and US hours are not an issue.

FAQ

Synthflow vs Cyberstaff, answered.

Make the switch in under 60 seconds.

Start free and keep your number. Your AI receptionist is answering as your business in about 60 seconds.