I've been meeting more and more\u00a0app\u00a0entrepreneurs who have made it in the app world without spending a penny on promoting their app. And I've known entrepreneurs who've earned more than a million dollars selling their app, largely promoting it for free. Some have made use of press publicity and some generated a lot of buzz on\u00a0social media. While some manually recruited\u00a0customers, others had tremendous customer referrals.\r\n\r\nIn my experience, it does not make sense to pay advertising dollars to get customers because the cost of a customer acquisition is never lower than the price of the app. What's more, there are many ways out there to promote your app for free. Here are 25 of your most creative options to promote your app:\r\n\r\n1. Build a microsite.\u00a0This one or two-pager showcases your app to the web audience. Take cues from\u00a0Snapchat\u00a0and\u00a0Path.\r\n\r\n2. Build a teaser website.\u00a0Do this\u00a0a month or two before your launch to collect email addresses of people who would like to know when the app launches.\r\n\r\n3. Start a blog.\u00a0Attach it to your microsite. Write interesting content that will draw people to your website.\u00a0Buffer app\u00a0does this really effectively.\r\n\r\n4. Share your content.\u00a0\u00a0Use your Twitter, Facebook, Google+ and LinkedIn profiles to promote the app several times in a week.\r\n\r\n5. Create a product video.\u00a0Make it creative, funny, thought-provoking or personal. Tell the story, but in a way people can identify with. Here's a great one as example from the\u00a0Dollar Shave Club.\r\n\r\n6. Get press, tons of it.\u00a0Entrepreneur\u00a0Neil Patel\u00a0says: "Press is the best way to kick start your startup, and the best way to get it is to manually reach out to journalists."\r\n\r\n7. Pitch to app review websites.\u00a0Sites like\u00a0148apps,\u00a0AppStoreApps\u00a0andAppAdvice\u00a0can generate a lot of buzz for your app if they mention it.\r\n\r\n8. Contact bloggers who would care.\u00a0Identify bloggers who write on niches that relate to your app. For instance, a children's app can be pitched to bloggers write write for\u00a0mothers.\r\n\r\n9. Apply for awards. Look into awards such as the\u00a0Kiip Build Fund\u00a0orThe Mobileys. If you win, you also get a ton of press, not to mention winner's booty.\r\n\r\n10. Start a podcast.\u00a0Publish it on iTunes or your own website. Draw content from the niche your app caters to most.\r\n\r\n11. Always be collecting emails.\u00a0Gather potential customer emails through Facebook, Twitter or your website. An email list of people who have opted in is a powerful marketing tool.\r\n\r\n12. Create a six-second how-to series.\u00a0Make the most of\u00a0Vine\u00a0with videos potential customers will find useful. The hashtag #howto is one of the top trending tags on Vine.\r\n\r\n13. Use Dubbler.\u00a0Promote your blog posts or content having to do with your app's niche on\u00a0Dubbler\u00a0--\u00a0a 60-second audio social network.\r\n\r\n14. Post on Pinterest.\u00a0Use blog images, infographics and visual content from your app to create content on your Pinterest board. \u00a0You can even use happy customer photos or hold contests.\r\n\r\n15. Manually recruit customers.\u00a0The creator behind\u00a0Canvsly\u00a0reaches out to local art schools, libraries and pediatricians to get more customers. Know your audience and find them.\r\n\r\n16. Run a contest.\u00a0For example, you can encourage\u00a0people to tweet and share content on their social networks promoting your app. A random person every week can win a promo code to download your app for free if it is a paid one.\r\n\r\n17. Create a Facebook group.\u00a0\u00a0Form a group for people with common interests related to your app's niche so they can meet and socialize regularly. If your app caters to hikers, for example, create a hiking group.\r\n\r\n18. Get speaking opportunities.\u00a0Research events that touch on the topic your app addresses and make an appearance. Start small and get recognized as an authority in the space.\r\n\r\n19. Take advantage of voicemail.\u00a0Include a creative mention of your app in your phone's voicemail recording.\r\n\r\n20. Be obsessive about resolving negative reviews. Remember: A happy customer is a brand ambassador for your app.\r\n\r\n21. Make good use of\u00a0App Store Optimization.\u00a0You can find it at\u00a0the app store.\r\n\r\n22. Contact admins of related Facebook pages.\u00a0Look for pages with 100k+ likes and reach out to their admins. Make sure these pages have something to do with the focus of your app. Then give them a compelling reason to mention it.\r\n\r\n23. Optimize your email signature.\u00a0Provide a catchy one-liner about your app along with the link to download it in your email signature.\r\n\r\n24. Consider offering a promotional price.\u00a0If your app is a pay-to-download one, consider a promotional pricing of $0.99 during the launch time. This price point encourages impulse purchases.\r\n\r\n25. Integrate social within the app.\u00a0This will make it obvious to users to share with others.\u00a0Path app\u00a0allows users to share photographs on social networks and\u00a0Draw Something\u00a0makes sure you rope in a friend or more.