# How Tolan uses Braintrust

**4x**: “4x faster prompt iteration”

As published on [braintrust.dev](https://www.braintrust.dev/customers/tolan). Captured by usedby on 2026-11-05.

- Company: [Tolan](https://www.usedby.ai/companies/tolan.md)
- Tool: [Braintrust](https://www.usedby.ai/tools/braintrust.md)
- Industry: [Artificial Intelligence](https://www.usedby.ai/companies/industry/artificial-intelligence.md)
- Teams: Research & Product

## The use case: how Tolan deploys Braintrust

Tolan, an AI companion app, uses Braintrust so non-technical subject matter experts can review conversation logs, curate problem-specific datasets, compare prompt versions in playgrounds, and deploy prompt changes to production without engineering handoffs.

Summary written by usedby from the source page, in English. The figures are those of Braintrust and Tolan, not ours.

> Before implementing this workflow, prompt changes required coordination between subject matter experts and engineers. Now, domain experts identify issues, create datasets, test solutions, and ship changes, resulting in 4x the number of weekly prompt iterations.

> A lot of what we're working on is really squishy stuff
>
> Lily Doyle, Research & Product

Source: [braintrust.dev](https://www.braintrust.dev/customers/tolan), captured 2026-11-05.

## Braintrust users in Artificial Intelligence

- [Rex](https://www.usedby.ai/companies/rex.md) — Confirmed
- [Granola](https://www.usedby.ai/companies/granola.md) — Observed
- [Lovable](https://www.usedby.ai/companies/lovable.md) — Observed
- [Suno](https://www.usedby.ai/companies/suno.md) — Observed

## What usedby checked

We compared the story with its live page on 2026-11-05.

- Checked: the figure 4x is printed word for word on the page, near the name of Tolan.
- Checked: the passage quoted above is copied word for word from the page, near the name of Tolan.
- Checked: Tolan uses Braintrust. Confirmed line. Latest check across sources: 2026-11-05.
- Not checked: the result itself. We quote it; we did not measure it.

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Source: https://www.usedby.ai/case-studies/tolan-braintrust · How we check: https://www.usedby.ai/methodology