I was recently looking for a simple percentage calculator for iPhone and I came across OffOf, an app developed by Daeo Corp. and available for free on the App Store.
As the name suggests, OffOf lets you calculate the percentage off an amount or the percentage of an amount. While this operation is possible with any calculator, OffOf has a visual interface with buttons to switch calculation types with a single tap. If you want to calculate how much a $50 t-shirt is going to cost you at “25% off”, select the Off button, tap percentage and enter a number, then tap Amount and the app will calculate it in real time. On the other hand, if you have to know how much the 20% of 135 corresponds to, you can choose the Of type and let the app calculate it for you with no additional manual operations.
My main concern with OffOf is that, in an effort to provide a colorful iOS 7 design (reminiscent of Numerical), it’s hard to distinguish the selection state for the Percentage and Amount fields. The app uses a white highlight for numbers in those areas, but I find it hard to parse when compared to the light gray used for the non-selected state. It’s a minor problem, but it confused me when I started using the app.
OffOf won’t become a hit among calculator power users, but, for me, is solves a common problem, and it’s free on the App Store.
Unlock More with Club MacStories
Founded in 2015, Club MacStories has delivered exclusive content every week for over six years.
In that time, members have enjoyed nearly 400 weekly and monthly newsletters packed with more of your favorite MacStories writing as well as Club-only podcasts, eBooks, discounts on apps, icons, and services. Join today, and you’ll get everything new that we publish every week, plus access to our entire archive of back issues and downloadable perks.
The Club expanded in 2021 with Club MacStories+ and Club Premier. Club MacStories+ members enjoy even more exclusive stories, a vibrant Discord community, a rotating roster of app discounts, and more. And, with Club Premier, you get everything we offer at every Club level plus an extended, ad-free version of our podcast AppStories that is delivered early each week in high-bitrate audio.
Choose the Club plan that’s right for you:
- Club MacStories: Weekly and monthly newsletters via email and the web that are brimming with app collections, tips, automation workflows, longform writing, a Club-only podcast, periodic giveaways, and more;
- Club MacStories+: Everything that Club MacStories offers, plus exclusive content like Federico’s Automation Academy and John’s Macintosh Desktop Experience, a powerful web app for searching and exploring over 6 years of content and creating custom RSS feeds of Club content, an active Discord community, and a rotating collection of discounts, and more;
- Club Premier: Everything in from our other plans and AppStories+, an extended version of our flagship podcast that’s delivered early, ad-free, and in high-bitrate audio.