PromptLayer vs ProofHound
PromptLayer
promptlayer.com
ProofHound
proofhound.orgSide by side
| Figure | PromptLayer | ProofHound |
|---|---|---|
| Price from | $49/mo | $29/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 4 | 3 |
| Spec score · Prompting Tool | 7.8 (#6) | 7.6 (#7) |
| Spec score · AI Prompt Management Software | 7.9 (#12) | 7.6 (#18) |
| Spec score · AI Prompt Generators | 7.9 (#15) | 7.7 (#18) |
| Spec score · Prompt Management Software | 7.9 (#14) | 7.7 (#18) |
| Spec score · Prompt Engineering Tools | 7.8 (#17) | 7.7 (#18) |
| Integrations | The LangChain integration exports traces through OpenTelemetry and supports cost and latency analytics, searchable metadata, and turning traces into evaluation datasets. | The site lists Web UI, Webhook, API Token, and MCP as connection options for business systems and AI agents. |
| Intended users | PromptLayer describes its platform as serving engineers and domain experts who build and improve AI products together. | The product targets critical classification workflows including risk control, financial judgment, content moderation, and customer service intent recognition, including low-code work by operations, risk, and analyst teams. |
| Support | The pricing comparison lists basic support for Free, Pro, and Team, and dedicated support for Enterprise. | The site lists GitHub, Discord, a Chinese-speaking QQ group, and email for community discussion, product updates, and business contact. |
Plans
In their own words
PromptLayer
PromptLayer combines a prompt registry and visual prompt CMS with evaluations, observability, and agent tracing for teams building AI products. Teams can visually edit, version, test, and deploy prompts without waiting for an application redeploy, allowing domain experts and non-technical stakeholders to work alongside engineers. Evaluations can run when prompt versions change, through the API, or on demand in the UI. They include historical backtests and side-by-side model comparisons. Tracking covers requests, traces, cost, latency, token usage, scores, and custom metadata, with OpenTelemetry span support. The OpenAI integration includes versioned prompts, release labels, request observability, evaluations, and model comparisons. Free, Pro, and Team are cloud-hosted in the US; Enterprise offers self-hosting on GCP, AWS, or Azure, EU cloud hosting, or single-tenant cloud hosting. PromptLayer states that it maintains SOC 2 Type 2, HIPAA, GDPR, and CCPA compliance. Free costs nothing, Pro costs $49 a month, and Team costs $500 a month. Enterprise pricing is custom.
ProofHound
ProofHound is a prompt-optimization platform for LLM classification work, available through an API, self-hosted deployment, or the web. It examines error cases, iterates prompts, validates outputs, and provides controlled deployment and rollback. Dataset uploads accept CSV, TSV, JSONL, JSON arrays, and ZIP files, with field mapping in the interface. Optimization can target overall accuracy or category measures such as recall for high-risk categories and precision for error-prone classes. Immutable prompt versions retain variable configurations, output rules, and differences between revisions. Experiment records include datasets, model configurations, sample judgments, and overall and category metrics. Release controls include gray traffic, A/B testing, full rollout, and one-click rollback. Connections include the web UI, webhooks, API tokens, and MCP. Customers supply their own model provider, and ProofHound says model calls are not charged. A free plan is listed at free, while self-hosted open source is also free.