PromptFluent vs Vellum
PromptFluent
promptfluent.comVellum
vellum.aiSide by side
| Figure | PromptFluent | Vellum |
|---|---|---|
| Price from | $14/mo | $30/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | — |
| iOS | — | Yes |
| Android | — | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 12 | 9 |
| Spec score · Prompt Management Software | 9.1 (#4) | 8.6 (#7) |
| Company legal name | The Chrome Web Store identifies the developer as PromptFluent LLC. | Vellum's privacy notice identifies Vocify, Inc. as the provider of the service. |
| Notable news | PR Newswire lists a PromptFluent release dated March 3, 2026 about enterprise AI governance and the cost of unmanaged AI execution. | On April 21, 2026, Vellum released one-click Chrome Web Store installation, generally available X integration, expanded Slack permissions, and web voice settings. |
| Product | PromptFluent describes itself as an enterprise AI execution management and governance platform for prompts, workflows, standards, approvals, and execution intelligence. | Vellum describes itself as a personal AI assistant that can read files, manage calendars, send email, run code, and control a computer. |
| Rating on Chrome Web Store | 5.0 out of 5 from 1 rating. | 5.00 out of 5 from 3 ratings |
| Self-hosting | The cited product and security pages describe a hosted service and do not state that self-hosting is available. | The runtime can be self-hosted locally or on user infrastructure, including Linux hosts and customer VPC deployments. |
| Support | The contact page says general inquiries receive a response within 24 hours, and the Learn section provides guides and tutorials. | Vellum lists support contact as [email protected]. |
| What it does | PromptFluent describes itself as an AI execution management and governance platform for prompts, workflows, approvals, standards and execution intelligence. | Vellum is a personal AI assistant that can read files, manage calendars, control computers, take calls, perform transactions, and retain personal context. |
Plans
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
Vellum
- BaseFree
- FreeFree
- Mighty$30 a month
- Mighty$30 a month
- Custom$50 a month
- Super$100 a month
- Super$100 a month
- Ultra$200 a month
- Ultra$200 a month
In their own words
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.
Vellum
Vellum is a personal AI assistant that can read files, manage calendars, send email, run code, and control a computer. It saves preferences and context in its workspace for later conversations, and users can create, install, and manage skills. Listed OAuth services include Discord, GitHub, Google services, HubSpot, Linear, Twitter (X), Asana, Notion, Microsoft Outlook, and Todoist. Vellum says OAuth tokens stay in a credential vault rather than being exposed to the language model. Sensitive actions prompt for approval, and users can set trust rules for standing permissions. By default, conversation context is sent to Anthropic to generate responses; OpenAI, Google, OpenRouter, Fireworks, and local Ollama are listed alternatives. An internet connection is required. Vellum Cloud runs assistants in isolated environments with private storage and 24/7 availability. The Free plan includes first tasks and pay-as-you-go credits. Mighty costs $30 a month, Super $100 a month, and Ultra $200 a month. There is no shipped Linux desktop client, but Linux users can use the web app, Chrome extension, or self-host the runtime.