PromptSource vs SpacePrompts
PromptSource
github.comSpacePrompts
spaceprompts.comSide by side
| Figure | PromptSource | SpacePrompts |
|---|---|---|
| Price from | — | $5/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 0 | 3 |
| Spec score · Prompting Tool | 6.9 (#9) | 8.4 (#3) |
| Spec score · Prompt Management Software | 7.0 (#25) | 8.5 (#8) |
| API | The API provides Template, Metadata, DatasetTemplates, and TemplateCollection classes to store, manipulate, and use prompts and metadata. | The API can retrieve and run prompts, count tokens, and enhance prompts; access is available on Pro and Team plans and limited to 60 requests per minute per API key. |
| Prompt library | The repository describes a collection called P3, with about 2,000 English prompts for more than 170 English datasets as of January 20, 2022. | The service stores prompts in categories and tags and supports searching and reuse. |
Plans
In their own words
PromptSource
PromptSource has no write-up on Specifiction yet; its figures are above.
SpacePrompts
SpacePrompts is a prompt management platform for people and teams working with AI. It runs on the web, through an API, and with Chrome, Edge, and Firefox extensions. Users can save, organize, run, version, and reuse prompts. The Playground combines an editor, variables, model selection, and immediate runs. An Evaluator scores prompts, highlights weak areas, and gives improvement guidance. Every save creates a version that can be restored later. The prompt manager extension can turn highlighted webpage text into a prompt. Its token counter supports OpenAI, Claude, Gemini, and DeepSeek models, showing token counts and estimated costs. Pro and Team plans provide API access, limited to 60 requests per minute per key. Team workspaces add shared libraries, collaborative editing, and role permissions for up to five members. Free includes 50 prompts and daily usage limits; Pro is $5 a month billed annually, and Team is $9 a month billed annually.