Demoz Calculator

My Experience with Demoz Calculator

What surprised me most was how a simple calculator could feel so hostile to use. I downloaded it after seeing a random comment about it on a forum, thinking maybe it had some cool feature my stock app didn’t. The first time I really needed it was on a Tuesday morning, rushing to figure out a client’s budget adjustment before a 9 AM call. I tapped it open, and bam—a full-screen ad for a mobile game. I swiped it away, punched in the numbers, and just as I hit equals, the screen went blank for a second and then showed a generic error message. My entire input was gone. I had to scramble to use the browser on my laptop instead, which made me nearly late. For an app with one job, failing at that exact moment felt like a personal insult to my schedule.

Features Worth Noting

Look, there isn’t much to praise here, which is the core of the problem. The history function is there, tucked behind a tiny icon. I used it once to check a previous calculation from the day before, and it did save it, so that’s something. The layout is basic, which in theory is good—it’s not trying to be a scientific graphing calculator. The button for switching between standard and scientific mode is clear, though I never used the latter. After my support ticket, they actually got back to me. The agent was polite and asked for my phone model (Galaxy S23) and Android version, which suggests they might be trying to diagnose issues, even if the response took almost four days.

What Needs Work

Everything else. The performance is janky. Button presses sometimes don’t register unless you tap them dead center, which ruins your flow when you’re adding up receipts. The ads are relentless. Beyond the opening ad, banner ads sit at the bottom, and every few calculations, a video ad with sound will interrupt you. I was at a coffee shop last week trying to split a bill three ways, and an ad blared out, drawing stares. It’s embarrassing. The app also feels bloated; it doesn’t open or close snappily. For a professional who needs quick, accurate numbers, this app introduces doubt and wasted time at every step.

Pricing

It’s free, but that’s a trap. The price is your attention, your data, and your patience. There is no option to pay to remove the ads. You are the product, and the service you’re getting in return—basic arithmetic—is fundamentally broken. I’d gladly pay a few dollars for a calculator that works instantly and without fuss. This model of “free but unusable” is worse than a straightforward paid app because it wastes the one thing I can’t get back: time.

Developer Notes

The update history in the Play Store is sparse, with notes that just say “performance enhancements” every few months. It doesn’t feel like active development. My one support experience, while eventually helpful, took way too long. Several days for a reply on a crashing app isn’t acceptable when my phone’s built-in calculator works instantly. It gives the impression this is a side project that isn’t a priority, which explains the persistent bugs and ad-heavy approach. They’re not building a tool; they’re running an ad platform with a calculator skin.

Security & Privacy

I got it from the Play Store, so I’m not worried about malware. The privacy policy is a standard link in the listing. The real concern for me is what the app is doing in the background to serve so many targeted ads. It clearly has permissions to track usage for ad-serving purposes. For a calculator, that feels invasive. I don’t need an app that’s profiling my calculation habits to sell me things. I just need 2+2 to equal 4 without a three-second lag and an ad for weight loss tea.