CALC Smart Calculator ±

• Annual Contributor — $2.99/year ($0.24/mo)
• Annual Contributor — $5.99/year ($0.49/mo)
• Quarterly Supporter — $0.99/quarter
• Quarterly Supporter — $1.99/quarter

Last verified 6 Aug 2026

4.8 2364 ratings · App Store

1. 5/5So close...

   I searched and searched for a decent calculator for my Apple Watch. After deliberating the cost, I finally went for this one. It has the features I need/want, and works pretty well. I like the haptics feedback when typing. For some reason, I couldn’t add the complication to my watch face from the phone app, so I had to do it on my watch. It took me a bit of time to figure out how this app works, but I think it’ll be easy and fast to use with time/practice.

   cady.not.katie · 6 Aug 2026

2. 4/5One time purchase now requires a subscription

   I purchased this calculator and have enjoyed it for years. It was advertised as one-time purchase. Now with the latest version it is popping up a subscription authorization screen every time I press the equals button asking for a subscription. It has also disabled a lot of the unit conversion functionality. You can’t offer a product as a one time purchase and then years later after the sale come back requiring me to pay you more money. If this is not resolved soon I will delete the app and never purchase anything else from this developer. UPDATE: this has been fixed and is no longer requesting a subscription. Thanks for fixing this. I will update my review.

   Gazell25000 · 6 Aug 2026

3. 5/5Amazing function

   I do not use any other calculator…on my phone or off. This is simply the best. It does way more than what I need for my modest math requirements, but it also is perfect for what I need. Especially love the ability to erase parts of equations if I make a mistake and the conversions capability is superb, too. I’ve used this app for years and will not switch.

   JayarOH · 6 Aug 2026

4. 5/5Love it!

   As someone who is bad at math, I rely on a calculator for the simplest equations. I love this app because I can see what I’ve typed in written out as I go, so in case I make a mistake I can go back and fix it.. I always use it instead of the calculator that comes with my iPhone.. it’s perfect for my iPad too!

   Lindseygrimey · 6 Aug 2026

5. 1/5Ugh I just want to do math

   I have used this calculator for a number of years. However the most recent update throws up a dialogue that I’m supposed to swipe down to close but it doesn’t close and now I can’t do any kind of math to save my life! ~~~~ I received a dev response email today. I can’t tell who is being lame here. iIs it Apple because I only received the email about the developer response today, Oct. 2018? Or is it the developer because they somehow backdated their response, which is dated the day after I posted this review. I suspect it’s both! And restarting the app I didn’t help! You had a bad update own it!

   SuperShoeDiva · 6 Aug 2026

Privacy

• Data Not Linked to You — Analytics — Identifiers — Device ID Developer declared
• Data Not Linked to You — Analytics — Usage Data — Product Interaction Developer declared
• Data Not Linked to You — Identifiers Developer declared
• Data Not Linked to You — Usage Data Developer declared

Accessibility

• Dark Interface — SUPPORTED Store published
• Differentiate Without Color Alone — SUPPORTED Store published
• Larger Text — SUPPORTED Store published
• Reduced Motion — SUPPORTED Store published
• Sufficient Contrast — SUPPORTED Store published