ChromeWinner vs. Langfa.st

ChromeWinner

🏅 ChromeWinner is "ahrefs for extensions". Analyze the competition, learn from the best and promote your extension. Receive daily updates on how your extensions perform and what competitors do. Grow your user base organically in Chrome Web Store by learning from already successful extensions. Subscribe to daily email digest and receive detailed updates: 📈 SERP for Chrome Store: monitor search results in the Chrome Web Store 👤 daily user growth: know which extensions acquire users faster ⚠️ get alerts when there are new players in the market (new competitors) ✍️ new reviews and rating changes - use competitors' feedback for your own profit ✨ get notified when competitors release new versions

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.

Reviews

Reviews

Pros
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Cons
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Pros
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Works without login or API key1
Supports 50+ models out of the box1
Built-in support for variables and Jinja2 templating1
Instant response, no setup required1
Clean and distraction-free UI1
Cons
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No custom API key support (yet)1
Not ideal for running complex multi-turn chats1

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