Free trial
No credit card is needed to start. The free plan remains free and covers up to 50 prompts, with Pro available for larger libraries and additional features.
Learn moreSpacePrompts
A versioned prompt library that follows you across every AI model
Beginner API
What is SpacePrompts?
SpacePrompts is a prompt manager for people and teams who use AI daily. It combines a Playground editor with variables and model selection, an Evaluator that scores weak spots, full version history, shared workspaces with role-based permissions, browser extensions for Chrome, Edge and Firefox, and an HTTPS API for pulling prompts into apps.
SpacePrompts is a prompt management workspace for individuals and teams who use AI assistants every day and keep losing the instructions that actually work. The core pitch is retrieval rather than storage: a single library that holds your prompts, keeps every revision, and makes the current version available whether you are typing in ChatGPT, Claude, or your own application code. The working loop starts in the Playground, an editor with variable support and a model picker where you can write from scratch, generate a prompt from a stated goal, or fork a template. Running a prompt there feeds into an Evaluator that scores weaknesses such as missing output structure, vague rules, absent length constraints, and undefined source criteria, then suggests fixes. Every save creates a version, so a bad edit can be rolled back to the previous revision. Saved prompts move into a shared workspace with role-based permissions and an audit trail, and can be pulled into production with a single HTTPS API call, no SDK required. Distribution is handled by browser extensions for Chrome, Edge, and Firefox. Clicking the toolbar icon opens a searchable view of the whole library and copies a prompt in one click. Text highlighted on any page can be saved into the library directly, which suits people who draft prompts inside chat windows rather than a dedicated editor. The tool is aimed at prompt engineers, AI product teams, and heavy daily users who currently default to Notion documents or git repositories and hit the limits of both. The free tier covers up to 50 prompts without a credit card, and paid plans add capacity and team features. Anyone working across several models at once is the clearest fit.
How do you use SpacePrompts?
1Create your account
Sign up from the login page. No credit card is required and the free tier stays free, with a library limit of 50 prompts.2Write or generate a first prompt
Open the Playground and either write a prompt from scratch, generate one from a stated goal, or fork an existing template. Add variables where the prompt needs reusable slots.3Run and score it
Pick a model in the Playground and run the prompt. The Evaluator then scores specific weaknesses such as vague rules or missing output structure and points to fixes.4Save a version and iterate
Saving captures a version. Keep editing and saving, and roll back to an earlier revision whenever a change performs worse than what came before.5Install the browser extension
Add SpacePrompts to Chrome, Edge or Firefox. The toolbar icon gives a searchable library from any page, and highlighted text can be saved as a prompt.6Fetch prompts over the API
Read the API documentation and replace pasted prompt text with an HTTPS call that returns the current saved version inside your application.
Pros and cons
Pros
- Playground with variables and a model picker lets a prompt be tested before it is committed to a libraryAI
- Version history on every save makes it practical to roll back a regression such as v13 performing worse than v12AI
- Browser extensions for Chrome, Edge and Firefox expose the library from any page, including saving highlighted textAI
- Role-based permissions and an audit trail give teams a clear record of who changed whatAI
- HTTPS API pulls the current prompt version into an application without an SDKAI
Cons
- Free plan caps the library at 50 prompts, which a working professional can exhaust quicklyAI
- The Evaluator judges prompt quality by its own criteria, so scores are a starting signal rather than a guarantee of better outputAI
- No dedicated mobile apps are listed; mobile use depends on the browserAI
- Extension coverage stops at Chromium and Firefox browsers, leaving Safari users outAI
- Teams already comfortable with git and a CI pipeline may find an API round trip less natural than versioned prompt filesAI
How much does SpacePrompts cost?
Pricing
There is a free plan that requires no credit card and holds up to 50 prompts. A Pro tier exists for users who need more capacity and features, and a satisfaction guarantee is offered, with a refund if the product does not work out. Exact Pro pricing is not stated on the homepage.
Learn moreSupport
Support is reached through the contact page or on Twitter/X at @spaceprompts_, with responses typically within 24 hours. The same contact page takes feedback and feature requests.
Learn moreIntegrations
Prompt access is available through a REST API over HTTPS, documented at the API docs page, and through browser extensions for Chrome, Edge and Firefox, which also let highlighted page text be saved into the library.
Learn moreFeatures
Playground editor with variables, model picker and instant runs; prompt generation from a goal; an Evaluator that scores weaknesses with suggested fixes; version history on every save; shared workspaces with role-based permissions and an audit trail; browser extensions for Chrome, Edge and Firefox; HTTPS API access to current prompt versions.
Frequently asked questions about SpacePrompts
How much does SpacePrompts cost?
There is a free plan that requires no credit card and holds up to 50 prompts. A Pro tier exists for users who need more capacity and features, and a satisfaction guarantee is offered, with a refund if the product does not work out. Exact Pro pricing is not stated on the homepage.Does SpacePrompts offer a free trial?
No credit card is needed to start. The free plan remains free and covers up to 50 prompts, with Pro available for larger libraries and additional features.Does SpacePrompts have an API?
Yes, SpacePrompts offers an API.How do you use SpacePrompts?
The walkthrough on this page covers 6 steps: 1. Create your account 2. Write or generate a first prompt 3. Run and score it 4. Save a version and iterate 5. Install the browser extension 6. Fetch prompts over the API.What platforms does SpacePrompts support?
SpacePrompts is available on Web App and Browser extension.What does SpacePrompts integrate with?
Prompt access is available through a REST API over HTTPS, documented at the API docs page, and through browser extensions for Chrome, Edge and Firefox, which also let highlighted page text be saved into the library.
Status
StatusActive
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Added10/21/2026
Platforms
Web AppBrowser extension
Pricing
FreemiumFreeSubscription
