Prompt Assay vs PromptFluent
Prompt Assay
promptassay.aiPromptFluent
promptfluent.comSide by side
| Figure | Prompt Assay | PromptFluent |
|---|---|---|
| Price from | $49/mo | $14/mo |
| Free plan | — | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | — |
| Plans published | 4 | 12 |
| Spec score · Prompt Management Software | 7.7 (#17) | 9.1 (#4) |
| Intended users | The maker describes the product for prompt engineers, teams sharing prompt libraries, researchers evaluating models, and developers retrieving prompts through an API or SDK. | The About page identifies enterprise leaders, revenue/marketing/growth teams, risk and compliance leaders, founders, agencies, and individual power users as audiences. |
| Product | Prompt Assay is a workbench for authoring, refining, versioning, testing, and shipping LLM prompts and Agent Skills. | PromptFluent describes itself as an enterprise AI execution management and governance platform for prompts, workflows, standards, approvals, and execution intelligence. |
Plans
Prompt Assay
- Solo$49 a month
- Team$99 a month
- EnterprisePriced on request
- FreePrice not published
PromptFluent
- FreeFree
- Magic on Demand – 10 scans$12, paid once
- Magic on Demand — 10 scans$12, paid once
- Wand Boost$14 a month
- Magic on Demand – 25 scans$25, paid once
- Magic on Demand — 25 scans$25, paid once
- Pro$25 a month
- Wand Pro Pack$29 a month
- Magic on Demand – 50 scans$40, paid once
- Magic on Demand — 50 scans$40, paid once
In their own words
Prompt Assay
Prompt Assay is a web and API workbench for authoring, refining, versioning, testing, and shipping LLM prompts and Agent Skills. Its critique feature evaluates clarity, completeness, structure, technique use, robustness, and efficiency, with written reasons. An in-editor AI pair can brainstorm, critique, improve, rewrite, compare, and convert content. Connect your own Anthropic, OpenAI, or Google models to run a prompt across 2–5 models in parallel and compare outputs, latency, token use, and cost; optional LLM-as-Judge scoring is available. For Agent Skills, users can create multi-file bundles, critique them, and run Behavioral Evals across Claude, GPT, and Gemini. Imports accept Markdown, Anthropic JSON, OpenAI JSON, or raw text; its bundle preserves versions, tags, fragments, and metadata. The Free plan is free, with 250 calls monthly and one seat; seven initial platform-funded calls are available before BYOK is needed for ongoing use. Solo costs $49 a month and includes API and TypeScript SDK access. The public API and SDK require Solo or higher.
PromptFluent
PromptFluent is an AI prompt and workflow management platform focused on enterprise governance and execution intelligence. Its library advertises more than 20,000 practitioner-built prompts across 13 business functions and more than 30 industries. Prompt Studio creates structured prompts, adapts library prompts, builds multi-step chains and saves work to versioned personal or team libraries. Team capabilities include shared libraries, approvals, version control and role-based access; analytics surface patterns, trends, anomalies and recommendations across shared AI work. A Chrome or Edge extension searches and inserts prompts inside ChatGPT, Claude, Gemini, Copilot and Perplexity, and supports Windows, macOS, Linux and ChromeOS. PromptFluent says customer data is encrypted at rest and in transit, organization data is isolated with row-level security, and private business material is not used to train public AI models. Free access is available; Pro costs $25 a month when billed annually. Team costs $50 a month when billed annually per user. Enterprise pricing is custom through a limited Founding Customer Program.