Polymorph develops a new mobile app for OneDayOnly







The situation

OneDayOnly, founded in 2009, saw an opportunity in the South African market to offer goods for sale via an online platform at huge discounted prices for a limited period of 24 hours – for “one day only”.  Over the past 12 years, the company grew to over 200 staff with headquarters in Cape Town. They still offer their customers a brand-new batch of deals every 24 hours from gadgets to groceries, at prices below retail value. Since partnering with Polymorph to develop their new mobile app, these deals can now be accessed through both their mobile app and website. The OneDayOnly app provides customers with access to exclusive app-only deals and competitions. Customers can make use of the wish list to earmark their favourite deals for later and search for their favourite categories using the all-new categorisation functionality.

In 2020, Polymorph was briefed to build OneDayOnly’s  mobile app in close cooperation with the company’s own team of backend developers using the existing backend Application Programming Interface (API). The goal was to have a prototype of the app on the table as soon as possible to simulate user experience and then to validate the app with their customers.  Ultimately, OneDayOnly wanted the app to be live in time for Black Friday – the biggest South African shopping day of the year!

The solution

Polymorph worked with OneDayOnly’s design agency to identify the app requirements, grouped these requirements into delivery milestones, and created a robust product roadmap to follow. Based on this roadmap, Polymorph commenced the app-building process.  The skills and necessary development technology tools were further identified keeping in mind that iOS and Android mobile platforms make use of different development technology stacks. In order to be ready for the Black Friday deadline, the team decided to use the React Native platform that could be deployed to both iOS and Android platforms, instead of building on and maintaining separate code bases. A further reason for choosing React is the fact that Polymorph knew that OneDayOnly had an experienced internal team with Javascript skills who would be able to take over and maintain the code base after the project was completed and handed over. Polymorph further gave substantial input on the design side of the app such as how the information should be displayed and presented by, for example, adding animation to ensure a seamless and effortless user experience.

The results

In collaboration with Polymorph, OneDayOnly was able to deliver an innovative mobile solution for iOS and Android devices. Data collected one year after the launch of the app in October 2020 shows that the impact on the client’s business included:

  • Increased business momentum, with the mobile app attracting 2,800 new users daily.
  • Overall growth of 515,438 installs  since launching the app.
  • A scalable solution capable of handling increased server loads across various mobile networks.


“At the time when we approached Polymorph,  we already had a solid backend and an in-house team of experienced web app developers. However, we realised that our customers needed a mobile app designed and built by mobile development experts and that web and mobile dev are not one and the same thing. Polymorph surpassed all our expectations. Collaborating with the team at Polymorph was seamless, professional and all milestones were met on time and within budget. Not only did our user base grow since using the new app but our total business growth also saw a definite surge,” says Charl Greeff, Head of Engineering at OneDayOnly.

Software development is an ongoing process and Polymorph will continue to provide assistance and add additional functionality as required.


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“Collaborating with the team at Polymorph was seamless, professional and all milestones were met on time and within budget. Not only did our user base grow since using the new app but our total business growth also saw a definite surge.”

Charl Greef, Head of Engineering at OneDayOnly

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