UncannyPrompt vs Vellum
UncannyPrompt
uncannyprompt.comVellum
vellum.aiSide by side
| Figure | UncannyPrompt | Vellum |
|---|---|---|
| Price from | — | $30/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 9 |
| Spec score · Prompt Management Software | 6.6 (#26) | 8.6 (#7) |
| Product | UncannyPrompt is a structured home for reusable AI prompts, variables, versions, sharing rules, and audit history. | Vellum describes itself as a personal AI assistant that can read files, manage calendars, send email, run code, and control a computer. |
| Self-hosting | The product can run in the user's infrastructure with Docker Compose, SQL Server, and configurable authentication. | The runtime can be self-hosted locally or on user infrastructure, including Linux hosts and customer VPC deployments. |
Plans
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
UncannyPrompt
UncannyPrompt has no write-up on Specifiction yet; its figures are above.
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.