We build the agents we wanted to hand our own queues to

Synth started in a support team that was drowning. Five years on, we build, run and grade AI agents for more than 400 support teams, and we still read the transcripts every week.

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Four colleagues talking around a table of laptops in a bright office

Why we started

In 2021 our founders ran support at a fast-growing marketplace. The bots they bought guessed at policy, and the only way to know how they were doing was to read a sample of fifty conversations on a Friday.

So they built the opposite: agents that follow fixed flows for anything involving money, explain every step they take, and are graded on every conversation rather than a sample.

That is still the whole company. Everything we ship has to make an agent more useful to a customer, or easier for a team to trust.

founded in London: 2021
support teams in production: 400+
conversations handled: 1.2B
people across 14 countries: 64

How we got here

2021
First flow in production
A refund flow for one marketplace, graded on every conversation from day one.
2022
Seed round and first ten customers
Retail and travel teams, all found through support leads telling each other.
2023
Voice goes live
Phone agents with sub-second replies, built on the same flows as chat.
2024
Series A, Lisbon hub opens
Funding to grow research and a second home for the product team.
2026
A billion conversations
Across 38 languages, with every one of them traced and scored.