LangFast Alternatives

LangFast is described as 'Next-generation AI prompt development platform that empowers teams to prototype, test, and ship robust AI features 10x faster — with no signup required' and is an website in the office & productivity category. There are 2 alternatives to LangFast, not only websites but also apps for Mac, iPhone and iPad. The best LangFast alternative is WhichModel. It's not free, so if you're looking for a free alternative, you could try My Prompt Tester.

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Alternatives list

  1. WhichModel icon

    WhichModel

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    Compare models and optimize prompts with our comprehensive benchmarking platform. Make data-driven decisions for your AI applications.

    Cost / License

    • Subscription
    • Proprietary

    Platforms

    • Online
    WhichModel screenshot 1
     

    • WhichModel is the most popular Web-based alternative to LangFast.

    • WhichModel is the most popular commercial alternative to LangFast.

    • WhichModel is Paid and ProprietaryLangFast is Freemium and Proprietary
  2. My Prompt Tester icon

    My Prompt Tester

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    Draft and test prompts and app/assistant instructions for Apple Intelligence. Copy the prompt, instruction, and response together in one tap—or save them as a set. Saved sets sync with iCloud so you can access them on Mac, iPhone, and iPad.

    Cost / License

    • Free
    • Proprietary

    Platforms

    • Mac
    • iPhone
    • iPad
    My Prompt Tester screenshot 1
     

    • My Prompt Tester is the most popular Mac, iPhone & iPad alternative to LangFast.

    • My Prompt Tester is the most popular free alternative to LangFast.

    • My Prompt Tester is Free and ProprietaryLangFast is Freemium and Proprietary
    • My Prompt Tester is Privacy focused and LightweightLangFast is not according to our users
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