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p/langtailShip AI Apps With Fewer Surprises
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Petr Brzek

Langtail Public Beta - Ship AI apps with fewer surprises

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Langtail is an LLMOps platform that helps teams speed up the development of AI-powered apps and ship to production with fewer surprises. With Langtail, you can debug prompts, run tests, and observe what’s happening in production.

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Petr Brzek
Maker
📌
👋 Hi Product Hunters! I’m Petr, co-founder and CEO of Langtail. Over the past year, I’ve spoken with dozens of founders and engineers about their experiences building AI-powered apps. I heard from almost everyone that taking an app from a simple demo to a great product that can be shipped to users is HARD WORK. Some of the common challenges I heard: - LLMs can be unpredictable, making traditional testing tools more frustrating than helpful. - Writing a good prompt is an art form, and sometimes the best person for the job isn’t an engineer - which is a problem if all of the prompts live in git. - The best practices for using LLMs are constantly changing as new models are released and as teams get more experience. We built Langtail to address the pain points that a team experiences as they take their proof-of-concept and turn it into a real product. Here are the top features in Langtail: 🧪 **Playground:** Debug and collaborate on prompts with your team. ✔️ **Tests:** Create a suite of tests to evaluate how changes affect your prompt’s output. 🚀 **Deployments:** Publish prompts as API endpoints, allowing you to easily invoke them from your app. 📊 **Observability:** Logs provide insight into how your prompt is responding to real-world users and metrics help you monitor key metrics like latency and cost. If you give Langtail a try today, use the promo code PH50 for 50% off for life. You can claim it in the Billing section. If you have any thoughts about your first few minutes poking around the platform, drop them as a comment here and me or someone else on the team will respond!
Petr Brzek
Maker
Thanks Michael. 🙏
Honza Sládek
Just yesterday I recommended Langtail to a friend who is starting to build with LLMs. I think it's the best choice out there to start with a simple prototype and move to production.
Ryan Hefner
Maker
@honzasladek Thank you Honza — that is a high honor!
Martin Duris
Maker
@honzasladek Thank you Honza!
Jakub Žitný
💡 Bright idea
This is already a killer tool for many use-cases we are already using it for. Super excited for the upcoming features and good luck with the launch and further development! 💜
Petr Brzek
Maker
@jakubzitny Thank you very much for your support. We appreciate it. 🙏
Ryan Hefner
Maker
@jakubzitny great to hear @jakubzitny! So grateful for all of the early feedback we've gotten from the Deepnote team!
Martin Duris
Maker
@jakubzitny Thanks Jakub! We're excited to work with Deepnote on upcoming features. Thanks for all the feedback and trust. ❤️
Lubos Buracinsky
Top product and team! The jingle helps too 😂
Ryan Hefner
Maker
@lubos_buracinsky Thank you Lubos! We went back and forth about the jingle, so I'm glad that it's a hit 😀
Petr Brzek
Maker
@lubos_buracinsky Thank you. Suno AI helped us sing the jingle. 😀
Martin Duris
Maker
@lubos_buracinsky Thanks Lubos. I'm happy you like the video even though it is a bit cringe. 😂
Tomas Rychlik
Maker
Hey! I’m Tomas, co-founder and CTO of Langtail. I’m keen to hear about your first impression of Langtail! Could you take a minute to click around our website and then come back here and reply to this comment answering these two questions? - What's one thing you’re hoping that Langtail can do for you? - Are there any features that you expected but seem to be missing? Many thanks for your help and support on our launch!
Sudhanshu Gautam
Been using LangTail for a few months now, highly recommend. It has kept me sane. If you want your LLM apps to behave uncontrollably all the time, don't use LangTail. On the other hand, if you are serious about the product you are building, you know what to do :P Love the product and the team's hard work. Keep up the great work!
Petr Brzek
Maker
@sudhanshug16 Thanks, it means a lot to us.
Martin Duris
Maker
@sudhanshug16 Thanks a lot Sudhanshu! A great roadmap lies ahead of us; stay tuned.
Soham Adwani
Been using Langtail for a while, and it has made working with our clients a breeze
Ryan Hefner
Maker
@snazzyham It was great to chat with you last week and learn how your team has been using Langtail. What a cool use case!
Petr Brzek
Maker
@snazzyham ❤️
Martin Duris
Maker
@snazzyham Thank you for your trust, Sohan, in using Langtail with your clients. We are working on new features that speed up your workflow with clients even more. 🚀
Vojta Tranta
Great! And we have discovered a huge talent for narration jobs @ryan_hefner !
Petr Brzek
Maker
Agree, @ryan_hefner sounds nice. 😀
Hitesh Suthar
A much-needed playground before the production. Best of luck with your launch! Congratulations.
Ryan Hefner
Maker
@hiteshsuthar Thank you, Hitesh!
Petr Brzek
Maker
@hiteshsuthar Thanks, we put a lot of effort into our Playground. 🚀
Martin Duris
Maker
@hiteshsuthar Thank you, Hitesh! Have you tried Deployments yet?
Michal Stoklasa
Unpredictable behavior of LLMs, team collaboration on prompts and robust evaluation were the biggest pains for me when I was building my app. But now it's solved thanks to LangTail. It's a great product.
Ryan Hefner
Maker
@michal_stoklasa That's music to our ears, Michal! 🙌
Martin Duris
Maker
@michal_stoklasa Thanks Michal, let us know if you miss any features for your use case.
jølly🔥good
👋 Hey, I've tried your platform a few times now, and wow, the UX is outstanding! The effort that went into the tool you launched today is incredible - great job, @petrbrzek @rychlis and the Langtail team!  What’s in the pipeline for the future? Any chance you’ll support hot new open-source models like Llama3? Also, super keen to see if there's a plan for a self-hosted/on-premise gateway option. Thanks, and good luck on your journey! 🚀
Tomas Rychlik
Maker
@good_lly Hello, thanks for your feedback! Actually, last week when LLama3 came out, I was pretty intrigued and started experimenting with that myself. If you upvote the feature request here, I will reach out and invite you to an experimental version of Langtail supporting more models in the coming weeks: https://lngt.io/mlVS7
Petr Brzek
Maker
Hello @good_lly, thanks for the great comment. We are preparing: ▶️ Support for multiple LLM providers ▶️ Focus on prompt evaluations ▶️ Support for OpenAI assistants We are already internally testing Llama3 and will launch it soon.
Yiğit Konur
💡 Bright idea
LLM products are creating a flurry of bad experiences in their rush to hit the market quickly. But Petr and his team have been demonstrating since day one just how serious they are about doing this job with outstanding designs. I've been following them for over a year now and I highly recommend them to everyone. I'm certain they're going to reach fantastic places.
Ryan Hefner
Maker
@yigitkonur Thank you so much for being one of our most active users, Yiğit! We appreciate your feedback!
Martin Duris
Maker
@yigitkonur Thanks for your support along the way.
Václav Matějka
This tool provides great savings on infrastructure costs if you wish to develop LLM apps.
Ryan Hefner
Maker
@vaclav_matejka1 📉📉📉 thanks for your feedback @vaclav_matejka1 !
Martin Duris
Maker
@vaclav_matejka1 Thanks a lot Vasek!
Tomas Hermansky
Good stuff guys! I'm definitely going to give it a shot as an AI enthusiast, so I'm happy you offer even the free tier for me :).
Ryan Hefner
Maker
@tomas_hermansky Great to hear! We'd love to hear any feedback about your first impressions! You can leave a comment here or send them to our support 🙂
Martin Duris
Maker
@tomas_hermansky That sounds great, Tomas! Let me know, and we'll personally onboard you and extend your trial so you can get the most value out of it.
Johan Cutych
Exciting! Let's go!
Petr Brzek
Maker
@johancutych Thanks 🚀
Jiří Vicherek
Great team, great market, great investors! I am super excited to see it in production!!!!
Ryan Hefner
Maker
@jiri_vicherek Thank you, Jíří! We are too!
Martin Duris
Maker
@jiri_vicherek Thanks Jiri. Let me know if you need any help with onboarding.
Mikias Abera
Cool! Does this use Langchain under the hood? I wonder how OpenAI's Assistant API compares to your offering.
Petr Brzek
Maker
Hello @mikias, we don't use Langchain on the backend, but we support Langchain, so it's possible to use Langtail with Langchain. https://langtail.com/docs/proxy/... As for the OpenAI Assistant, we think they are great, and we are planning native support for them in Langtail. That said, we think there's value in offering a compatible Assistant API but with more flexibility and customization (like, for example, supporting different LLM providers).
Jakub Novák
Looks super useful, will definitely try in the near future!
Petr Brzek
Maker
@jakub_novak2 Great, let us know how you find using Langtail.
Martin Duris
Maker
@jakub_novak2 Thanks Jakub! Let us know if you need any help with onboarding.
Tomáš Kafka
Ever since I have known @petrbrzek, he and his team has always built tools you want to use - attention to detail is their brand. And current state of LLMs can really use a debugging & testing workbench :).
Ryan Hefner
Maker
@tomaskafka We like to think so! We've been obsessing over every detail of Langtail in preparation for this launch. It isn't perfect, but we think it's the best UX out there today. 🙂
Petr Brzek
Maker
Thank you, @tomaskafka, for the nice comment. I appreciate it. ❤️
Martin Duris
Maker
@tomaskafka Thank you Tomas!
Thomas Barragry
Nice job guys! Hearing great things about Langtail from the team at Ceros! Good luck with everything post launch!
Ryan Hefner
Maker
@thomas_barragry Thank you, Thomas!! We've learned a lot from the Ceros team and greatly appreciate you guys 🙂
Petr Brzek
Maker
@thomas_barragry Thanks, we are very happy to be able to collaborate with Ceros and together improve Langtail. 🚀
Martin Duris
Maker
@thomas_barragry Thanks Thomas!