Developer tools

Synth

Website
Founded 2024Origin source ↗Checked 2026-09-15

Overview

Choose a coding agent harness, model, and task dataset and optimize context and prompts to get the best performance for long-horizon tasks

Company description As recorded 2026-11-08
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Developer toolsInfrastructureDevelopersDevelopersSubscription

Founders & team

Josh Purtell

Founder/CEO

Josh is the founder and CEO of Synth. Before Synth, Josh was employee #3 and research scientist at Basis, which uses AI agents to automate accounting tasks. Previously, he built out the ML core of a Cyber Threat Intelligence SaaS product at Halborn, a cyber security startup that acqui-hired his startup Politeia. He founded Politeia while wrapping up a Math undergrad at Yale, where he did time-series ml research for fun.

LinkedIn X
Founder profile As recorded 2026-09-15
2team members reported
Source-reported As recorded 2026-09-15

Founded 2024 · Source

News & product activity

Sources & observations

Y Combinator

Profile depthverified profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented

Source-based assessment · automated evidence rules

The retained text does not establish product availability or customer use.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced peoplesourced founding year
startup.observe Directory coverage · Sources & method