Promptster vs Portkey
Prompt testing tool vs AI gateway. Compare providers during development vs route them in production.
Unified AI gateway supporting 250+ models with observability, caching, failover, and load balancing. $3M in funding.
| Feature | Promptster | Portkey |
|---|---|---|
| Primary focus | Prompt comparison | AI gateway |
| Supported models | All major providers | 250+ models |
| Setup time | 30 seconds | API integration |
| Side-by-side comparison | Yes | No |
| AI consensus analysis | Yes | No |
| Cost comparison | Yes | Via logs |
| Failover / load balancing | No | Yes |
| Request caching | No | Yes |
| Prompt versioning | Yes | Yes |
| MCP for AI editors | 10 tools | No |
| Starting price | Free | Free |
| Paid plans | $9\u201329/mo | $49/mo |
Why Choose Promptster
- Built for Testing: Purpose-built for comparing AI providers. Run the same prompt across all supported providers and see results side-by-side.
- Quality Scoring: LLM-as-a-Judge evaluation scores every response on relevance, accuracy, completeness, and clarity.
- Simpler Pricing: Plans from $0\u201349/mo with straightforward API call limits. No per-request pricing tiers.
Choose Promptster When
- You\u2019re evaluating which AI provider to use
- You want quality scoring and consensus analysis
- You need scheduled regression monitoring
- You want a simple web UI for prompt testing
- You want MCP integration for AI coding assistants
Choose Portkey When
- You need a production AI gateway with failover
- You want to route requests across 250+ models
- You need caching and load balancing in production
- You want a unified API endpoint for all providers