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Modular Prompt Library
What it is
Modular Prompt Library is a web platform for creating, organizing, testing, and sharing AI prompts. Its reusable components let users assemble prompts from parts and use them in multiple projects. Version history records prompt changes and allows a return to an earlier version. Teams can share libraries and review prompt development together. For testing, users connect their own OpenAI, Anthropic, or Google API keys, fill prompt variables, and adjust temperature, top-p, and max tokens. They can save presets for prompt versions and compare model outputs side by side, including latency, token counts, and estimated cost. The Personal Account plan is free for personal use and allows up to five workspaces with unlimited prompts and modules. Starter is free; Growth costs $2.50 a month, and Professional costs $5 a month. Organizational plans have a 60-day free trial with no credit card required to start. The product says keys are encrypted at rest and prompt content stays in the user’s workspace.
For and against
For
- Reusable components work across projects
- Version history supports reverting changes
- Side-by-side comparisons show latency and token counts
- Free personal plan includes unlimited prompts and modules
Against
- Personal Account is for personal use only
- Users provide their own model API keys
- Model usage is billed by the provider
- Enterprise pricing is custom and not listed
The verdict
Modular Prompt Library brings prompt building, version tracking, team collaboration, and model comparison into one web workspace. Consider the workspace and user limits, API-key requirement, and provider-billed model usage when choosing a plan.
Who it suits
It suits prompt engineers and teams in content creation, marketing, software development, customer support, and education. Personal users can use the free plan, while teams can share libraries and review changes.
Plans and prices
Personal Account
Up to 5 workspaces · Unlimited prompts & modules · Prompt testing with own API keys · Personal use only
Read 8 Oct 2026 · modularprompt.com
Starter
Up to 5 users OR 3 workspaces · MFA · Team collaboration · Granular user access control
Read 8 Oct 2026 · modularprompt.com
Growth
6–10 users OR 4–10 workspaces · MFA · Team collaboration · Granular user access control
Read 8 Oct 2026 · modularprompt.com
Professional
11–30 users OR 11–15 workspaces · MFA · Team collaboration · Granular user access control
Read 8 Oct 2026 · modularprompt.com
Enterprise
30+ users OR 15+ workspaces · MFA · Team collaboration · Granular user access control
Read 8 Oct 2026 · modularprompt.com
On the record
- API key handling
- The site says API keys are encrypted at rest, never shared, and model usage is billed directly by the provider.modularprompt.com · read 8 Oct 2026
- Free tier limits
- The Personal Account plan is for personal use and allows up to 5 workspaces with unlimited prompts and modules.modularprompt.com · read 8 Oct 2026
- Intended users
- The site identifies AI content creation teams, prompt engineers, marketing agencies, software development teams, customer support teams, and educational institutions as audiences.modularprompt.com · read 8 Oct 2026
- Model comparisons
- The test environment compares outputs side by side and shows latency, tokens, and estimated cost.modularprompt.com · read 8 Oct 2026
- Model integrations
- Users can connect their own OpenAI, Anthropic, and Google API keys to test prompts across models.modularprompt.com · read 8 Oct 2026
- Organizational security
- Organizational plans list MFA security, granular user access control, and organizational management.modularprompt.com · read 8 Oct 2026
- Product
- Modular Prompt Library is an AI prompt management platform for building, managing, sharing, testing, and comparing prompts.modularprompt.com · read 8 Oct 2026
- Prompt controls
- Users can fill prompt variables, tune temperature, top-p, and max tokens per model, and save presets per prompt version.modularprompt.com · read 8 Oct 2026
- Reusable modules
- Users can build prompts from reusable components and combine them across projects.modularprompt.com · read 8 Oct 2026
- Support
- The site provides a support contact form for questions and help with the product.modularprompt.com · read 8 Oct 2026
- Team collaboration
- Teams can share libraries, review changes, and collaborate on prompt development.modularprompt.com · read 8 Oct 2026
- Trial
- Organizational accounts have a 60-day free trial for all tiers, and the site says no credit card is required to start.modularprompt.com · read 8 Oct 2026
- Version history
- The product tracks prompt changes with version history and supports reverting to previous versions.modularprompt.com · read 8 Oct 2026
- Workspace privacy
- The site says prompts, variables, and outputs stay in the user's workspace and that prompt content is never accessed, used, or shared by the maker.modularprompt.com · read 8 Oct 2026
