Javelin by Lean Startup Machine

All-in-one platform for building products people want


Javelin helps you test startup ideas with potential customers and gives you data to guide your decisions.

Record and transcribe customer interviews, test landing pages, and use pre-designed surveys to analyze the most important feedback.

Eight years working with startups around the world. ProductHunt's Founder is 2x alumnus of our workshop.

29 Reviews
Harry Raymond
Ray Wu
Muneeb Ali
 +105 reviews
  • Michael Gold
    Michael GoldFounder, Holojam

    If you're looking for a low risk way to test new product innovations, Javelin gives you a framework designed by experts.


    It will be even more powerful with lots of users. So sign up :)

    Trevor and Grace are well known experts in bringing products from idea to market. This software allows companies to leverage their knowledge and insights at scale.

    I was an early beta user of this product and have worked with Trevor and Grace since 2012.

    Looking forward to seeing the next generation of great ideas and business models that are developed now that Javelin has reached 1.0.

    Michael Gold has used this product for one year.
  • Ray Wu
    Ray WuCo-Founder, MagicBus.io

    It's like having a guide to help you fill out the assumptions you want to test


    I have not gone through the entire interview cycle to have an informed opinion

    I've tried the previous iteration of Javelin and I didn't stick. I'm constantly doing interviews, and I really dig the new structured approach to formulate assumptions and interview directions.

    Ray Wu has used this product for one day.
  • Pros: 

    Validating customers who love your product before you build or invest too much is invaluable. It's incredible that this is free to use now


    Waited forever for something like this, so happy it's here.

    The hardest part for any startup I've built or worked with is finding paying users and fully validating your idea. It's not enough to have some paying users if you have never explored other customer segments and their pain points. You may not be servicing the largest pain point and the largest potential customer segment. I can not stress how this issue of building product in the wrong direction is, it can turn a great team, and a decent product into a failure.

    For me it took years until I went through the lean startup machine to see how focused product validation helps. It's the opportunity cost of building product and spending time on something people don't want that scares me the most.

    Javelin is the combination startup lessons and failures into a working model for startups. The teachings are in almost every accelerator in the world and javelin is here to bring this to everyone for free.

    It's not enough to know what you want to build. Your customers need to want your idea, and want to pay for it. I've see this problem over and over again. Pushing though our own ego lets you build the best version of the product. This process of pushing beyond what you think, in to what you know is what the Javelin process does. This is what lean means for a startup. Our best intentions can divert our focus away from the prize, away from cash flow. This is why I love this process and I know it will help many people all over the world.

    Shuken has used this product for one month.
  • Kapil Kane
    Kapil KaneDirector of Innovation, Intel China

    Great way to capture & track customer validation


    None so far

    If more & more startups begin to use Javelin, this can become de facto standard for investors to do due dilligence on the startups they are investing in.

    Kapil Kane has used this product for one week.
  • Pros: 

    Easy to set up, quick to test hypothesis, Hypothesis testing is FREE.


    Interview templates and AdWords Integration is PAID. Should have had a Freemium model.

    Amazing and must use tool for anyone who is trying to validate their business idea.

    The tools helps you identify the right customer segment and their top problem by means of customer interview and landing pages.

    Will save months of time if used appropriately.

    Rohith Veerajappa has used this product for one week.
  • Casey Abbott Payne
    Casey Abbott PayneFounder, Being Bipolar, Inc.

    Holds your hand through the process of coming up with customer hypothesis to finding product market fit.


    There was an issue with the automated dialing feature a little while ago so I haven't tested it yet.

    I'm working on my first startup as a solo-founder and using Javelin to help sketch out and conduct customer interviews has been awesome for me. I just finished my second interview today (in person). The UX is really clean and it's allowed me to stuff a lot of different thoughts and ideas into it. Since it forces me to be clear about what I'm doing I've been much more focused than I would have been if I solely relied on what I've picked up from books and videos. I'm also excited about seeing the digital and IRL communities grow with the tool!

    Casey Abbott Payne has used this product for one month.
  • Brooks Rao
    Brooks RaoInvestment Analyst Chinaccelerator

    It's a full stack product innovation service. How do you not waste time and precious resources? It's simple. Use Javelin.


    Interviews are big aspect of this platform, but many entrepreneurs may undervalue the importance of speaking directly to the customer.

    Trevor, Grace, and Ryan are all veterans in the field. They've helped many startups navigate the perilous early stages of customer acquisition and product development. They've taken the lessons they've learned over the years and turned it into a platform that can help any entrepreneur avoid failing slow.

    Brooks Rao has used this product for one month.
  • Pros: 

    Intuitive app that helps you test new ideas at low cost.


    None that I've experienced so far.

    I enjoy using Javelin, it's a great tool for early stage, pre-product-market-fit startups. I also appreciate the wealth of knowledge about the Javelin method that is available on the site. Educational and functional, I can't wait to see where Trevor and Grace take this product.

    John Light has used this product for one year.
  • Pros: 

    A must have tool for any up and coming startups!


    Haven't found any cons so far.

    Provides a repertoire of tools for startups to validate their ideas and understand customers needs to make better decisions in the direction of the startup. Especially love the feature of auto-transcribing interviews and to gauge the likeliness of conversion. Highly recommend to all new startups to check it out! (Y)

    Daren Tan has used this product for one week.
  • Pros: 

    Love the method and I've used with in my own accelerator called MOX. We use it to validate ideas and help our startups grow in new markets


    Nothing right now, it's a solid product.

    This method works, it help people understand what they don't know. What they don't know is the most dangerous and can kill them. The platform is free and lets anyone validate their ideas.... It's awesome!

    Ryan Shuken has used this product for one month.
  • Marek Koyš
    Marek KoyšImpact community Shenzhen

    Holistic practical tool for every serious entrepreneur who want to know quickly how much His/Her idea suck :)


    I’m not aware of any major cons. Maybe tune up the mobile version little bit?

    I believe that most entrepreneurs can find this tool very useful anytime they want to test a new idea. If you’re willing to put in the work, Javelin will guide you through the lean process of validating your idea with the real costumers. In the world where everything is relative and most people are “thinking by feelings” it’s just so valuable to have a holistic and practical tool which guides your through the “reality check” quickly and efficiently. I’m using in for couple months and I love it! I definitely recommend you to sign up and test it ~ it’s for free.

    Marek Koyš has used this product for one month.
  • Faiz Fadzil
    Faiz FadzilCo-founder, Beta Factory

    Good framework, well-structured. Run time-boxed experiments. Quickly iterate and identify the right problem, customer and solution.


    Nothing that can't be done IRL without a digital equivalent.

    We've used the JEB method on all ideas our startup has worked on so far, all with great success. But after you get familiar with the process and methodology, those with more tactile tendencies can rely on good old-fashioned sticky notes, whiteboards and pens.

    Faiz Fadzil has used this product for one month.
  • Jan Smejkal
    Jan SmejkalCo-Director Startup Grind

    Easy to use, FREE, well structured, great support


    The only con I can think of is not having access earlier

    I can't wait to see Javelin helping entrepreneurs globally!

    Jan Smejkal has used this product for one month.
  • Pros: 

    All set up, just try it with a project, real or fake, even for testing or educational is a great tool


    not anyone by now

    Keeping an eye on this project since 2015, happy to see it finally happen.

    pascual aparicio has used this product for one month.
  • Scott Bales
    Scott BalesInnovation Ronin

    Solid methods, used in the real world


    Thought it was dead

    Great for those wanting to better understand their customer needs as it relates to their product or service

    Scott Bales has used this product for one year.
  • Adrian Lai
    Adrian LaiFounder - http://yu-mi.us

    Systematic approach to Lean, Easy to follow steps, Fast


    No Chinese transcripts (yet)

    We are using Javelin to optimize product-market fit for our own startup and its working great!

    Adrian Lai has used this product for one week.
  • Pros: 

    Helps a team structure the work and keep focused on measurable results.


    All products and startups are different. The framework is a bit skewed towards B2C.

    Was very helpful for my team where we had different backgrounds - gave us a very strong common platform to work based on

    Heidi Berg has used this product for one month.
  • Pros: 

    Love that we can do LSM online now


    Waited for this too

    LSM is awesome and I follow the programs

    Svetlana Khovracheva has used this product for one week.
  • Pros: 

    Focused, Excellent User Interface, Lean and only has what you need - no extra fluff.


    None yet

    Love the focused flow and how it allows you to capture an experiment from start to finish.

    Karina B has used this product for one week.
  • Jonas Wolf
    Jonas WolfAngelHack China Director

    Great team behind the product, proven experience, FREE, well structured


    finally on the market

    can't wait to test my next idea.

    Jonas Wolf has used this product for one day.