Stunning
Stunning helps SaaS and subscription businesses recover failed payments and reduce churn. It automates dunning, smart retries, and customer outreach for billing stacks including Stripe, Foxy, and Subbly.
Visit stunning.co →Software company · Est. 1998
We build software that helps online businesses earn more
Shiftedfrequency is an independent software company founded by Richard Felix. For more than 25 years we have designed, shipped, and operated products used by founders, agencies, and growing e‑commerce brands.
About Shiftedfrequency
Shiftedfrequency develops commercial software for entrepreneurs and online businesses. Our work spans website creation, customer communication, and operational tooling—areas where small teams need enterprise-grade capability without enterprise complexity.
The company was founded in 1998 and has shipped multiple generations of web and mobile products. We operate as a lean, product-focused organization: design, engineering, and customer support are handled in-house so we can iterate quickly and stand behind what we release.
Our products are sold and supported directly to business customers worldwide. We maintain public websites for each product, documented support channels, and ongoing development across our active product lines listed below.
What we do
Design and operate SaaS and web applications for revenue growth, marketing, and day-to-day business operations.
Who we serve
Founders, freelancers, agencies, and small-to-mid-size online businesses that sell products or services on the web.
How we work
Long-term product ownership: we build, host, support, and improve the software we publish under the Shiftedfrequency name.
Products
Shiftedfrequency publishes and maintains the following software products. Each is a standalone business operated on its own domain with dedicated support and documentation.
Receiver
Receiver is conversion and attribution software for SaaS and ecommerce. It shows who’s ready to buy, captures why others leave, triggers smart offers at exit, and reports which channels drive paying customers—connected to Stripe.
Visit receiverhq.com →
Are My Sites Up
Are My Sites Up provides uptime and availability monitoring for websites and APIs. Teams receive alerts when a property goes offline so they can respond before customers notice.
Visit aremysitesup.com →Leadership
Richard Felix — Founder
Richard Felix founded Shiftedfrequency in 1998 and leads product and engineering across the company’s software portfolio. He has spent his career building tools for online businesses—from early web applications through today’s SaaS products.
Contact
For general business inquiries, partnerships, press, or support routing, use the form below. Product-specific support is available on each product’s website.