Put an AI agent
on every conversation

Synth builds, runs and grades AI agents across chat, voice and email. Every decision is traced, every answer can be replayed, and every rule stays yours to change.

A support lead working on a laptop in a quiet office booth

Resolved without a hand-off

4,912 conversations today

Synth

Online, replies instantly

Hi Maya, I can see your latest order. How can I help?

09:41

My order arrived damaged. Can I get a refund?

09:41

Sorry about that. Order #48213 was delivered on Tuesday and is inside the returns window, so I have refunded it.

09:42

Refund issued

€64.00 to Visa ending 4821

09:42

That was fast. Thank you!

09:42

Write a message…

A support lead working on a laptop in a quiet office booth

Resolved without a hand-off

4,912 conversations today

Synth

Online, replies instantly

Hi Maya, I can see your latest order. How can I help?

09:41

My order arrived damaged. Can I get a refund?

09:41

Sorry about that. Order #48213 was delivered on Tuesday and is inside the returns window, so I have refunded it.

09:42

Refund issued

€64.00 to Visa ending 4821

09:42

That was fast. Thank you!

09:42

Write a message…

Running in production at 400+ support teams

  • Google
  • Cloudflare
  • Vercel
  • Stripe
  • Shopify
  • Slack
  • Spotify
  • Airbnb
  • Dropbox
  • Duolingo
  • Atlassian
  • Hubspot

71%

of conversations resolved end to end, with no hand-off

0.8s

median time to first word on a voice call

38

languages, detected and answered in the same turn

5 wks

from signed contract to live traffic, on average

71%

of conversations resolved end to end, with no hand-off

0.8s

median time to first word on a voice call

38

languages, detected and answered in the same turn

5 wks

from signed contract to live traffic, on average

One system to build, run and grade every agent

Most teams stitch together a prompt tool, a bot vendor and a spreadsheet of spot checks. Synth is the whole loop, so a fix found in grading is live in minutes.

1

Build

2

Run

3

Grade

Write the rules once. The agent follows them every time.

Language models handle the conversation. Flows handle the money. Refunds, cancellations and identity checks run as fixed steps you can read, so the model never improvises policy.

Persona, tone and escalation rules in one editor

Knowledge synced from help centres, PDFs and product feeds

Flows that call your APIs with typed inputs and outputs

Brand voice

Warm, brief, no jargon

Knowledge

2,418 articles synced 4 minutes ago

Refund flow

4 steps, published as v14

Escalation rules

Draft with 2 changes

Build

Run

Grade

Write the rules once. The agent follows them every time.

Language models handle the conversation. Flows handle the money. Refunds, cancellations and identity checks run as fixed steps you can read, so the model never improvises policy.

Persona, tone and escalation rules in one editor

Knowledge synced from help centres, PDFs and product feeds

Flows that call your APIs with typed inputs and outputs

Brand voice

Warm, brief, no jargon

Knowledge

2,418 articles synced 4 minutes ago

Refund flow

4 steps, published as v14

Escalation rules

Draft with 2 changes

Build

Run

Grade

Write the rules once. The agent follows them every time.

Language models handle the conversation. Flows handle the money. Refunds, cancellations and identity checks run as fixed steps you can read, so the model never improvises policy.

Persona, tone and escalation rules in one editor

Knowledge synced from help centres, PDFs and product feeds

Flows that call your APIs with typed inputs and outputs

Brand voice

Warm, brief, no jargon

Knowledge

2,418 articles synced 4 minutes ago

Refund flow

4 steps, published as v14

Escalation rules

Draft with 2 changes

Every answer arrives with its working

Open any conversation and replay it step by step: what the customer meant, which tool was called, which rule allowed the action, and what the model was given to write the reply.

100%

100%

of steps logged, tool calls and rules included

90 days

90 days

of full traces kept, longer on Enterprise

1 click

1 click

to replay a conversation on a new flow or model

Synth

My order arrived damaged. Can I get a refund?

Sorry about that. Order #48213 was delivered on Tuesday and is inside the returns window, so I have refunded it.

How this answer was made

Intent

refund_request, confidence 0.97

12 ms

Order lookup

#48213, delivered, €64.00

94 ms

Knowledge

Returns policy §2, damaged on arrival

141 ms

Rule

Refund under €200, allowed

203 ms

Action

Refund RF-90412 issued

288 ms

Reply

Drafted in brand voice

402 ms

Checks

PII and policy scan clean, sent

446 ms

Synth

My order arrived damaged. Can I get a refund?

Sorry about that. Order #48213 was delivered on Tuesday and is inside the returns window, so I have refunded it.

How this answer was made

Intent

refund_request, confidence 0.97

12 ms

Order lookup

#48213, delivered, €64.00

94 ms

Knowledge

Returns policy §2, damaged on arrival

141 ms

Rule

Refund under €200, allowed

203 ms

Action

Refund RF-90412 issued

288 ms

Reply

Drafted in brand voice

402 ms

Checks

PII and policy scan clean, sent

446 ms

Synth

My order arrived damaged. Can I get a refund?

Sorry about that. Order #48213 was delivered on Tuesday and is inside the returns window, so I have refunded it.

How this answer was made

Intent

refund_request, confidence 0.97

12 ms

Order lookup

#48213, delivered, €64.00

94 ms

Knowledge

Returns policy §2, damaged on arrival

141 ms

Rule

Refund under €200, allowed

203 ms

Action

Refund RF-90412 issued

288 ms

Reply

Drafted in brand voice

402 ms

Checks

PII and policy scan clean, sent

446 ms

Bring any model. Keep the stack you have.

Pick a model per step, not per contract. Route simple intents to a fast model and hard ones to a frontier model, and switch either without rebuilding the agent.

Model routing

median latency

01

Classify intent

fast

Open-weight 8B

42 ms

02

Extract fields

fast

Your fine-tune v3

58 ms

03

Compose reply

standard

Frontier model A

410 ms

04

Transcribe voice

speech

Speech model S2

160 ms

05

Grade conversation

careful

Frontier model B

680 ms

Regression suite passes on every swap

Model routing

median latency

01

Classify intent

42 ms

Open-weight 8B

02

Extract fields

58 ms

Your fine-tune v3

03

Compose reply

410 ms

Frontier model A

04

Transcribe voice

160 ms

Speech model S2

05

Grade conversation

680 ms

Frontier model B

Regression suite passes on every swap

Connected systems

calls today

Helpdesk

Tickets and warm hand-offs

18,420

CRM

Customer profiles and history

12,977

Commerce

Orders, stock and returns

9,364

Payments

Refunds and disputes

2,108

Data warehouse

Traces and scores, exported

41,250

Identity

Verification and SSO

6,733

Built around the work, not the chat window

Each industry ships with flows, rubrics and integrations for the conversations that fill its queues.

Retail

Where is my order, can I return it, does it come in blue. Answered with live stock and order data, refunds issued inside policy.

78%

resolved without an agent

−41%

cost per contact

Banking

Insurance

Telecom

Travel

Healthcare

Retail

Where is my order, can I return it, does it come in blue. Answered with live stock and order data, refunds issued inside policy.

78%

resolved without an agent

−41%

cost per contact

Banking

Insurance

Telecom

Travel

Healthcare

Retail

Where is my order, can I return it, does it come in blue. Answered with live stock and order data, refunds issued inside policy.

78%

resolved without an agent

−41%

cost per contact

Banking

Insurance

Telecom

Travel

Healthcare

Teams that stopped sampling and started reading every conversation

Portrait of Priya Raman

parcelry

“We used to review fifty tickets a week and hope they were typical. Now every conversation has a score, and the first thing we fixed was a flow we thought was fine.”

Priya Raman

VP Customer Operations, Parcelry

−38%

handle time in the first quarter

1 / 4

Portrait of Priya Raman

parcelry

“We used to review fifty tickets a week and hope they were typical. Now every conversation has a score, and the first thing we fixed was a flow we thought was fine.”

Priya Raman

VP Customer Operations, Parcelry

−38%

handle time in the first quarter

1 / 4

Ready for the teams who get audited

Synth runs in your region or your cloud, keeps customer data out of model training, and records every action with who approved the rule behind it.

Data residency

EU, US or UK hosting, or a private deployment in your own cloud account.

Single sign-on

SAML and OIDC with SCIM provisioning, and roles down to a single flow.

PII redaction

Card numbers, IDs and health data masked before any model sees them.

Guardrails

Policy checks on every reply, with blocked answers routed to a person.

Audit log

Every rule change, deployment and action, exportable to your SIEM.

No training on your data

Conversations are never used to train shared models. In writing.

ISO 27001

ISO 27001

Certified

SOC 2 Type II

SOC 2 Type II

Audited annually

HIPAA

HIPAA

BAA available

GDPR

GDPR

EU data residency

Synth meets the requirements for ISO 27001, SOC 2 Type II, HIPAA and GDPR.

Questions teams ask before they sign

Questions teams ask before they sign

Which language models does Synth use?

How long does a typical launch take?

What happens when the agent cannot help?

Is our data used to train models?

What counts as a resolved conversation?

Put Synth on your busiest queue

Bring a week of real transcripts. We will show you how many the agent resolves, and exactly how it got there.

5 weeks

to live traffic

71%

resolved end to end

0

policy breaches

Put Synth on your busiest queue

Bring a week of real transcripts. We will show you how many the agent resolves, and exactly how it got there.

5 weeks

to live traffic

71%

resolved end to end

0

policy breaches

Product notes, once a month.

What shipped, what we measured, and what we got wrong. No tracking pixels.

Sign-up is off in this preview. Connect a form endpoint in the site config to turn it on.

© 2026 Synth. All rights reserved.

Create a free website with Framer, the website builder loved by startups, designers and agencies.