Udemy, a leading marketplace for online learning, is offering nearly every course in their catalog to io9 readers for just $15. We’ve highlighted some great web and app development classes, but their catalog ranges from new languages to architectural design. With promo code SUMMER1515 this Udemy sale will save you up to 95% on courses.

Below are a few of the most popular web and app development classes available at Udemy:

If you don’t see what you’re interested in above, don’t fret, there’s over 10,000 courses at $15 each to help you learn a new skill or perfect an existing one. Use promo code SUMMER1515 and save up to 95% on courses throughout the Udemy catalog.

Choose From Over 10,000 Udemy Courses For $15 Each, Save Up To 95%

Terms and Conditions: Coupon codes SUMMER1515 is not valid with any other promotional offer or discount and is valid until 5/30/15 11:59 PST, respectively. One coupon code use per purchase only. Coupon code requires a Udemy account, and is subject to terms and conditions found here. Udemy reserves the right to cancel the coupon code at any time. Coupon code is not exchangeable for cash.Coupon code is not valid with purchases made on the Udemy iPhone, iPad or Android app. Some courses do not apply. If you return your purchase, you will be refunded the amount paid. Offer good while supplies last.

The Promotions team (we’re on the business side, not editorial) negotiates special offers on notable products. Interested in partnering with us? Drop us a line at promotions@gawker.com.