Langfa.st vs. Supabase
Langfa.st
Langfa.st is a fast and minimal playground for testing and refining AI prompts. It supports over 50 large language models, including OpenAI, Anthropic, Mistral, Cohere, Google, and others — all available instantly without setup. You can insert variables, use Jinja2 templating, and compare outputs across models. There’s no need to sign up or bring your own API keys — it works out of the box. Langfa.st was built to eliminate the friction of existing tools: complicated UIs, required credentials, or overpriced subscriptions. It gives AI teams and prompt engineers a clean, disposable space to experiment, debug, and iterate — all in one tab. Free to use. You only pay if you need more volume or power features.
Supabase
Supabase is the open-source alternative to Firebase. Like Firebase, it's a complete app development platform with user authentication, cloud functions, APIs, Postgres database, storage, vector embeddings, and other features. Supabase projects come with PostgreSQL's policy engine for fine-grained user access rules. It has social login integrations with Google, Facebook, GitHub, Azure (Microsoft), Gitlab, Twitter, Discord, and many more. They offer a customizable authentication component for React. Phone login and MFA can be added through third-party SMS providers such as Twilio or Bird. The free tier comes with 50,000 monthly active users. The Pro plan, at $25/month, comes with 100,000 MAUs and $0.00325/MAU beyond that.
Reviews
Reviews
| Item | Votes | Upvote |
|---|---|---|
| Works without login or API key | 1 | |
| Supports 50+ models out of the box | 1 | |
| Built-in support for variables and Jinja2 templating | 1 | |
| Instant response, no setup required | 1 | |
| Clean and distraction-free UI | 1 |
| Item | Votes | Upvote |
|---|---|---|
| No custom API key support (yet) | 1 | |
| Not ideal for running complex multi-turn chats | 1 |
| Item | Votes | Upvote |
|---|---|---|
| No pros yet, would you like to add one? | ||
| Item | Votes | Upvote |
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| No cons yet, would you like to add one? | ||
Frequently Asked Questions
Langfa.st is specifically designed for testing and refining AI prompts, offering a fast and minimal interface with support for over 50 large language models without the need for login or API keys. It is ideal for AI teams and prompt engineers looking for a distraction-free environment to experiment. In contrast, Supabase is an open-source app development platform that provides a comprehensive suite of features for building applications, including user authentication and database management. If your focus is on AI prompt testing, Langfa.st is the better choice, while Supabase is more suitable for full app development.
Yes, Langfa.st offers more flexibility for AI model testing as it supports over 50 models out of the box and allows users to insert variables and use Jinja2 templating. This makes it easier to compare outputs across different models instantly. Supabase, while powerful for app development, does not focus on AI model testing and lacks the specific features that Langfa.st provides for that purpose.
Langfa.st is designed to be user-friendly for quick testing, with a clean and distraction-free UI that requires no setup or login. This makes it easy for users to start testing AI prompts immediately. Supabase, while user-friendly for app development, involves more setup and configuration due to its comprehensive features, making it less ideal for quick testing compared to Langfa.st.
Langfa.st is a fast and minimal playground for testing and refining AI prompts. It supports over 50 large language models, including OpenAI, Anthropic, Mistral, Cohere, Google, and others — all available instantly without setup. Users can insert variables, use Jinja2 templating, and compare outputs across models without needing to sign up or provide API keys.
Pros of Langfa.st include: it works without login or API key, supports over 50 models out of the box, has built-in support for variables and Jinja2 templating, provides instant responses with no setup required, and features a clean and distraction-free user interface.
Cons of Langfa.st include the lack of custom API key support at this time and it may not be ideal for running complex multi-turn chats.
Langfa.st is particularly beneficial for AI teams and prompt engineers who need a clean, disposable space to experiment, debug, and iterate on AI prompts without the friction of complicated UIs or required credentials.
Yes, Langfa.st is free to use. Users only pay if they need more volume or access to power features.
Supabase is an open-source alternative to Firebase, offering a complete app development platform that includes user authentication, cloud functions, APIs, a Postgres database, storage, vector embeddings, and other features.
Supabase offers a variety of features such as user authentication, cloud functions, APIs, a Postgres database, storage, and vector embeddings. It also includes PostgreSQL's policy engine for fine-grained user access rules, social login integrations, and a customizable authentication component for React.
Supabase offers social login integrations with Google, Facebook, GitHub, Azure (Microsoft), Gitlab, Twitter, Discord, and many more.
Yes, phone login and multi-factor authentication (MFA) can be added to Supabase through third-party SMS providers such as Twilio or Bird.
Supabase offers a free tier with 50,000 monthly active users (MAUs). The Pro plan is priced at $25 per month and includes 100,000 MAUs, with an additional cost of $0.00325 per MAU beyond that.
