Sierra
Sierra builds branded voice and chat agents for support, charging per resolved conversation rather than per seat.
Full Sierra record →Head to head
Sierra vs Browser Use
Sierra (Sierra) and Browser Use (Browser Use) both sit in Agents & Automation. Browser Use shipped more tracked changes in the last 30 days (18 vs 1). Every value below comes from the latest crawl of the vendors' own pages.
| Attribute | Sierra Sierra | Browser Use Browser Use |
|---|---|---|
| Segment | Agents & Automation | Agents & Automation |
| Version | Agent OS 2.0 | API V4 |
| Entry cost | Pricing is not published (outcomes-based model: pay for results, not tokens). Contact sales. | Free tier · from $5/mo |
| Pricing tiers | Outcome pricing free | Free Credits free · Pay as you go (Browsers only) $5 · Browser Use Agents $5 · Enterprise free |
| Model stack | Claude · GPT-5 class · Sierra Agent OS 2.0 | Bring your own key · BU 2.0 · Claude Opus 5 · Claude Sonnet 5 · Gemini 3.6 Flash · GPT-5.6 · GPT-5.6 Luna · GPT-6 Astra · Grok 4.5 · MiniMax M3 |
| Context window | Model-dependent | Depends on chosen model |
| Public API | ||
| Routes models | ||
| Changes / 30d | 1 | 18 |
| Origin | Global | Global |
| Capabilities | Voice and chat agents, Agent OS, Brand persona control, Supervisor tooling, Outcome analytics, Horizon (Long-horizon agents), Ghostwriter (Agent-building agent), Agent Studio 2.0 | DOM-aware agent loop, Playwright control, Structured output, Cloud runners, Session recording, Fully Hosted Web Agents, Stealth Browsers, Browser Harness |
Browser Use
Open-source library that gives LLM agents reliable browser control.
Full Browser Use record →