Promptotype vs Vellum

Promptotype is a web-based platform for developing and evaluating structured tasks for language models. Its playground lets users build prompt templates, configure models, and work with function calling. Test queries can include expected JSON schemas or values; a model query can fill in an expected result. Users can run prompts against collections, from smaller development sets to larger checks for production readiness. The platform also provides run and test history, scheduled automated tests with email summaries, and automatic fine-tuned model creation from query collections. A JSON Schema Editor supports schemas compatible with the OpenAI API’s json_schema response_format. The free plan is free. Basic costs $6 a month and adds libraries for templates, configurations, and queries, plus collection testing. Professional costs $10 a month and includes 60 days of history, fine-tuning, and one weekly scheduled run. Team features are contact-based. The maker is Baionic, LLC, which lists a New York, New York mailing address.

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.