SpacePrompts

Free plan APIExtensionWeb

What SpacePrompts is

SpacePrompts is a prompt management platform for saving, organizing, running, versioning, and reusing AI prompts. Its web Playground provides an editor, variables, a model picker, and immediate runs for trying prompts. The Evaluator scores prompts, highlights weak areas, and offers guidance for improvement. Each save creates a version, and users can return to an earlier version.

The prompt manager extension works with Chrome, Edge, and Firefox, and can save highlighted webpage text as a prompt. A separate browser token counter supports OpenAI, Claude, Gemini, and DeepSeek models, showing token counts and estimated costs. That counter sends prompt text to SpacePrompts’ API for counting and says it does not retain the text after responding. By contrast, the prompt manager extension syncs prompts to SpacePrompts servers and caches prompts and authentication tokens locally; extension data is transmitted over HTTPS.

Free includes up to 50 prompts, with daily limits for AI enhancements, generations, and Playground runs. Pro is $5 per month billed annually and includes API access. Team is $9 per month billed annually for up to five members, with shared prompts, collaborative editing, and role-based permissions. API access is limited to 60 requests per minute per key and is available on Pro and Team. The service serves individuals and teams working with AI, including designers, writers, marketers, and API automation users.

Who it suits

SpacePrompts suits people and teams who create or reuse AI prompts, including designers, writers, marketers, and API automation users. Its shared library, collaborative editing, and workspace roles are relevant to teams of up to five members.

What it does well

Playground combines editing, variables, model selection, and prompt runs.
Evaluator scores prompts and gives improvement guidance.
Every save creates a version users can roll back.
Browser extensions support Chrome, Edge, and Firefox.
Team workspaces include shared prompts and role-based permissions.

What to know first

Free limits prompts to 50 and caps daily AI actions.
API access is limited to 60 requests per minute per key.
Team plan supports up to five members.

Limits

Free allows 50 prompts, 3 AI enhancements per day, 3 AI generations per day, and 3 Playground runs per day. Pro includes 300 enhancements, 300 generations, and 300 Playground runs per month; API access on Pro and Team is capped at 60 requests per minute per API key. Team includes up to five members.

Plans

Plan	Billed and limits	Price
Free	50 prompts · 3 enhancements/day · 3 generations/day · 3 Playground runs/day · BYOK · version history · Chrome extension · JSON/Excel export	Free
Pro	$60 billed annually (Save $48) · Unlimited prompts · 300 enhancements/month · 300 generations/month · 300 Playground runs/month · custom fields · API access · public sharing · priority support	$5 a month
Team	$108 billed annually (Save $72) · Everything in Pro · up to 5 members · shared library · collaborative editing · role-based permissions · dedicated onboarding	$9 a month

As spaceprompts.com lists them, read 15 Oct 2026. The maker's own page has the final word.

Getting started

Visit https://www.spaceprompts.com/ and choose the Free, Pro, or Team plan.
Use the web Playground to edit a prompt, add variables, choose a model, and run it.
Install the prompt manager extension for Chrome, Edge, or Firefox if you want to save highlighted webpage text.
Use the token counter extension for supported OpenAI, Claude, Gemini, or DeepSeek models.
Choose Pro or Team for API access, subject to its per-key request limit.

Verdict

Pick SpacePrompts if you want a place to manage prompt versions, test prompts, and use browser extensions or an API. Free has capped prompt and daily-use allowances; API access requires Pro or Team and has a per-key request limit.

Questions

Is SpacePrompts free?

Yes. Free costs nothing and includes 50 prompts, 3 enhancements per day, 3 generations per day, and 3 Playground runs per day.

What do the paid plans cost?

Pro is $5.00 per month, billed annually at $60. Team is $9.00 per month, billed annually at $108.

Which platforms does SpacePrompts support?

It is available on the web and through an API and browser extensions. The prompt manager extension supports Chrome, Edge, and Firefox.

What does Team include?

Team supports up to five members and includes a shared prompt library, collaborative editing, and role-based permissions.

What can the API do, and who can use it?

The API can retrieve and run prompts, count tokens, and enhance prompts. It is available on Pro and Team, with a limit of 60 requests per minute per API key.

How does the prompt manager extension handle data?

Extension data is transmitted over HTTPS. The extension syncs prompts to SpacePrompts servers and caches prompts and authentication tokens locally.

Facts from SpacePrompts's own pages

AI model token counter: The browser token counter supports OpenAI, Claude, Gemini, and DeepSeek models and shows token counts and estimated costs. · spaceprompts.com, 4 Oct 2026
AI tool integrations: The extension injects or reads prompts in ChatGPT, Claude, DeepSeek, Gemini, Copilot, Meta AI and Perplexity. · spaceprompts.com, 15 Oct 2026
API: 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. · spaceprompts.com, 4 Oct 2026
API availability: REST API access is offered on Pro and Team plans through personal API keys. · spaceprompts.com, 15 Oct 2026
API documentation depth: The public reference documents authentication, base URL, rate limits, four endpoints, examples and response codes. · spaceprompts.com, 15 Oct 2026
API enhancement: The enhancement endpoint accepts prompt text up to 3,000 characters and returns an improved prompt. · spaceprompts.com, 15 Oct 2026
API execution: POST /prompts/run/{slug} runs a stored prompt against an optional query using SpacePrompts' default AI model. · spaceprompts.com, 15 Oct 2026
API rate limit: API keys are limited to 60 requests per minute and excess requests receive HTTP 429. · spaceprompts.com, 15 Oct 2026
API retrieval: GET /prompts/{slug} returns a prompt owned by the API-key holder and can return plain text or JSON. · spaceprompts.com, 15 Oct 2026
API token counter: The token-count endpoint supports OpenAI, Claude, Gemini, DeepSeek, Qwen and Llama model aliases. · spaceprompts.com, 15 Oct 2026
Authentication: Login supports email magic links plus Google, GitHub and Microsoft sign-in; the login page says data is never shared. · spaceprompts.com, 15 Oct 2026
Browser extensions: The prompt manager extension is available for Chrome, Edge, and Firefox and can save highlighted webpage text as a prompt. · spaceprompts.com, 4 Oct 2026
Browser support: The extension is available for Chrome, Firefox and Microsoft Edge and can save highlighted webpage text as a prompt. · spaceprompts.com, 15 Oct 2026
Evaluation: The Evaluator scores prompts, identifies weak areas, and offers guidance to improve them. · spaceprompts.com, 4 Oct 2026
Export: The library can be exported to JSON or Excel. · spaceprompts.com, 15 Oct 2026
Founded: SourceForge lists the company as founded in 2025. · sourceforge.net, 15 Oct 2026
Founder origin: The founder says SpacePrompts began after an API-automation project created too many difficult-to-track prompts. · spaceprompts.com, 15 Oct 2026
Import update: A June 14, 2026 release added JSON import for up to 300 prompts per file and raised character limits. · spaceprompts.com, 15 Oct 2026
Integrations: The privacy policy lists Google, GitHub, and Microsoft as OAuth providers for account authentication. · spaceprompts.com, 4 Oct 2026
Intended users: The maker describes SpacePrompts as serving people and teams who work with AI, including designers, writers, marketers, and API automation users. · spaceprompts.com, 4 Oct 2026
Licence: AlternativeTo categorizes SpacePrompts as proprietary software rather than open source. · alternativeto.net, 15 Oct 2026
Limit: collaboration information: HyperStore says the available product information gives limited detail about collaboration features. · store.hypergpt.ai, 15 Oct 2026
Limit: pricing information: HyperStore says pricing and subscription details were not disclosed in the documentation it reviewed. · store.hypergpt.ai, 15 Oct 2026
Playground: The Playground lets users edit prompts, fill variables, choose a model and run prompts live. · spaceprompts.com, 15 Oct 2026