Promptster vs Helicone
Prompt comparison tool vs LLM gateway. Testing and evaluation vs production monitoring.
Apache 2.0 open-source platform for LLM monitoring and gateway proxying. YC-backed with $5M in funding, 4,900 GitHub stars.
| Feature | Promptster | Helicone |
|---|---|---|
| Primary focus | Prompt comparison | LLM gateway/proxy |
| Multi-provider comparison | All major providers | 100+ via proxy |
| Setup time | 30 seconds | One-line proxy |
| Cost tracking | Yes | Yes |
| AI consensus analysis | Yes | No |
| Scheduled monitoring | Yes | No |
| Production logging | No | Yes |
| Request caching | No | Yes |
| MCP for AI editors | 10 tools | No |
| Open source | No | Apache 2.0 |
| Starting price | Free | Free |
| Paid plans | $9\u201329/mo | $79/mo |
Why Choose Promptster
- Purpose-Built for Comparison: Designed from the ground up for prompt testing and provider comparison, not bolted onto a gateway.
- More Affordable: Full-featured plans from $9/mo vs $79/mo. Get comparison, scheduling, and analytics for less.
- AI-Powered Analysis: Consensus reports, LLM-as-a-Judge quality scoring, and cost optimization recommendations built in.
Choose Promptster When
- You want to compare AI providers before building
- You need structured quality scoring (LLM-as-a-Judge)
- You want scheduled regression testing
- You prefer a simple testing UI over proxy configuration
- Cost optimization across providers is your priority
Choose Helicone When
- You need a production API gateway/proxy
- You want request caching and rate limiting
- You need production-level logging and observability
- You prefer self-hosted open-source solutions