Perpend
Free AI playground for OpenAI GPT modelsExperiment with GPT models for free
Highlights
What you can do with it
- Developers test prompt behaviour quickly
- Users compare how different models answer
- Teams build reusable conversation prompts
How to use it
- 1 Open Perpend in your browser.
- 2 Add your OpenAI API key.
- 3 Choose a model such as GPT-4.
- 4 Start chatting or import a saved prompt.
Who it is for
Pros
- Free to use as a playground
- You control the model and your own key
- Prompt import and reuse built in
Limitations
- Requires your own OpenAI API key and credits
- Site availability has been inconsistent
- Scope is experimentation, not production
What Perpend is
Perpend is a free AI playground built for experimenting with OpenAI's GPT models. It is not a hosted assistant with its own credits; instead you bring your own OpenAI API key, pick a model, and start talking to it through a clean interface. GPT-4 is listed among the model choices. Beyond plain chat, it lets you create, explore, and import conversation and form prompts, which makes it useful for building a small personal library of prompts you reuse rather than retyping. The page also mentions a PLUS version that provides more direct access for users.
What you can do with it
- Chat with OpenAI GPT models through one interface
- Switch models, including GPT-4, to compare answers
- Build and store your own conversation prompts
- Import existing prompts instead of retyping them
Who it is for
- Developers testing how a prompt behaves
- Users who already hold an OpenAI API key
- Anyone comparing outputs across GPT models
- People who want a lightweight experimentation surface
What to watch out for
Because you supply the API key, your usage is billed by OpenAI on your own account, so the playground being free does not make experimentation free. Set spend limits on your key before you start, especially if you plan long or repeated runs, because a stuck loop can burn credits quietly. The tool is aimed at experimentation rather than production, so do not build a customer-facing product on it, and expect rough edges. Site availability has been inconsistent, which matters if you depend on it for work. The distinction between the free playground and the PLUS version is not spelled out, so confirm what each includes before relying on either.
FAQ
Is Perpend free?
It is described as a free AI playground, with a PLUS version mentioned for more direct access.
Do I need an API key?
Yes. You add your own OpenAI API key, which means your usage is billed by OpenAI.
Which models can I use?
You choose a model from the OpenAI line-up, and GPT-4 is listed as an option.
Why it is free
What the official page says： 免费
Free limits, trial length and features are decided by the official site and can change at any time.
Product preview
Screenshot archived from the listing page, for preview only.
