PromptForge vs Vellum
PromptForge
promptforge-app.comVellum
vellum.aiSide by side
| Figure | PromptForge | Vellum |
|---|---|---|
| Price from | $9/mo | $30/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 4 | 9 |
| Spec score · Prompt Management Software | 7.9 (#13) | 8.6 (#7) |
| Audience | The homepage presents PromptForge as a prompt management tool for AI developers who want to update prompts without redeploying application code. | Vellum characterizes the product as a personal assistant rather than a team or shared company tool. |
| Integrations | The integrations page lists providers and tools including OpenAI, Anthropic Claude, Google Gemini, Grok, Groq, Mistral, Vercel AI SDK, Ollama, Cohere, Together AI, Azure OpenAI, and AWS Bedrock. | OAuth integrations include GitHub, Notion, Linear, Airtable, Spotify, Gmail, Google Calendar, Slack, and other services, while MCP servers provide additional tools. |
| Support | The terms direct users to contact Mavity by email with questions. | Vellum lists support contact as [email protected]. |
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
PromptForge
PromptForge manages AI prompt templates and makes them available through a REST API. It is aimed at AI developers who want to update prompt text without redeploying application code. Templates can include reusable placeholders using {{variable}} syntax. Each edit creates an immutable version, and users can compare line-by-line changes and roll back. Applications can request a stable, latest, or specific prompt version; API requests use Bearer token authentication and GET or POST methods. Listed integrations include OpenAI, Anthropic Claude, Google Gemini, Grok, Groq, Mistral, Vercel AI SDK, Ollama, Cohere, Together AI, Azure OpenAI, and AWS Bedrock. PromptForge stores, organizes, versions, and shares text prompts; it does not perform AI generation, analysis, or training. The free Hobby plan is billed forever and allows one production prompt and 1,000 API requests per month. Starter costs $9 a month, Pro $29 a month, and Business $49 a month. The terms state that there is no export feature or formal SLA or uptime credits.
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.