Modular Prompt Library vs Prompt Bunker
Modular Prompt Library
modularprompt.comPrompt Bunker
promptbunker.comSide by side
| Figure | Modular Prompt Library | Prompt Bunker |
|---|---|---|
| Price from | $2.50/mo | $8/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Plans published | 5 | 2 |
| Spec score · Prompt Management Software | 8.2 (#10) | 8.1 (#12) |
| Product | Modular Prompt Library is an AI prompt management platform for building, managing, sharing, testing, and comparing prompts. | Prompt Bunker is a workspace for organizing AI prompts and turning them into repeatable team workflows. |
| Support | The site provides a support contact form for questions and help with the product. | The Pro plan includes priority support and faster feature access. |
| Team collaboration | Teams can share libraries, review changes, and collaborate on prompt development. | Shared workspaces and owner, editor, and viewer roles help teams share prompts with related notes, tasks, and status. |
| Version history | The product tracks prompt changes with version history and supports reverting to previous versions. | Teams can save prompt iterations, attach version notes, and keep changes connected to project context. |
Plans
Modular Prompt Library
- Personal AccountFree
- StarterFree
- Growth$2.50 a month
- Professional$5 a month
- EnterprisePriced on request
In their own words
Modular Prompt Library
Modular Prompt Library is a web platform for building, managing, sharing, testing, and comparing AI prompts. Users can assemble prompts from reusable components and use them across projects. Version history records changes and supports returning to an earlier version, while shared libraries let teams review and collaborate on prompt work. For testing, users connect their own OpenAI, Anthropic, or Google API keys, fill prompt variables, adjust temperature, top-p, and max tokens, and save presets for a prompt version. The comparison environment displays outputs side by side with latency, token counts, and estimated cost. The site says keys are encrypted at rest, usage is billed directly by the model provider, and prompts, variables, and outputs remain in the user's workspace. Personal Account is free for personal use, with up to five workspaces and unlimited prompts and modules. Starter is free for up to five users or three workspaces; Growth costs $2.50 a month and Professional costs $5 a month. Organizational accounts have a 60-day free trial, and no credit card is required to start.
Prompt Bunker
Prompt Bunker has no write-up on Specifiction yet; its figures are above.