Owl Decide vs Adam's Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Owl Decide
This app helps users make decisions with various random selection tools. Features include yes/no answers, picking one option from a list with weighted choices, generating random numbers within a range, rolling multiple dice, and using a spinner to select from a circular list.
- Yes or No decision maker
- Weighted choice picker
- Random number generator
- Multi-dice roller
- Circular spinner tool
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MAKING DECISIONS IS A HOOT WITH OWL DECIDE! Whether it’s picking a place for lunch, deciding who has to do a chore, or deciding which artisanal lettuce you want on your hipster sandwich, some decisions just aren’t easy. Owl Decide is here to help, featuring Moberto the Owl and his arsenal of features that help you and your friends choose between options in fair and fun ways: === Yes or No === Some answers are best left to fate. When you just need a yes or no answer, Owl Decide can give you guidance with its “Yes or No” feature. It’s like everyone’s favorite black-pool-ball-fortune-teller, but without the uncertainty. (You’ll never have to “ask again later”!) === Pick One === It can be hard to choose amongst multiple options. The “Pick One” feature lets you input all your options, and then have Moberto choose one at random. Favor one option slightly more than another? Not a problem. You can weight choices to your heart’s content before getting a decision. Perfect for picking an ice cream flavor. === Pick a Number === Whether you need a number between 1-10, or 6-135, Moberto’s got you covered. The “Pick a Number” feature allows you to quickly generate a random number between any interval. (And unlike the number of fingers behind your friend’s back, this number generator is guaranteed to be random!) === Dice === Dice have been used for thousands of years. But for just as long, people have forgotten them, accidentally eaten them, or had them roll under a couch. Owl Decide’s “Dice” feature lets you quickly and easily roll multiple (up to a dozen) dice at once on your iPhone or iPad. Never be without dice again! === Spinner === Around and around Moberto spins; where he lands, you’ll soon know. Owl Decide’s “Spinner” feature lets you quickly hone in on a random person or item in a circle. Moberto will slowly come to a stop, pointing toward one of the 22 points in a circle. (We do not condone the use of this feature for Spin the Bottle.)
Adam's Calc
A utility calculator that adds memory functionality to standard calculations. Designed to make your device's calculator more helpful by remembering previous results.
- Memory function for calculations
- Enhanced utility calculator
- Intuitive design
- Remembers previous results
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Adam's Calc is a utility calculator designed by rdConcepts. This design is intended to help make the standard calculator more useful by building some "memory" into the device. Inspiration -> Donald Norman.
Screenshots
Verdict
The clearest difference is in-app purchases: Owl Decide at none against Adam's Calc's 1. Owl Decide also leads on ads (none vs shown) and ratings volume (9 vs 2). Adam's Calc's advantage is rating (5.0 vs 4.6) and update cadence (every 4 months vs every 14 months). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Adam's Calc sells 1 one-off in-app purchase. Owl Decide asks for nothing beyond the download.
Adam's Calc holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 9 and 2 respectively.
Owl Decide ships an update every 14 months, Adam's Calc every 4 months. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.
| Parameter | Owl Decide | Adam's Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (9 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 83.3% of reviews | — |
| Number of ratings | 9 — better | 2 |
| Update frequency | Every 14 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 15.0 |
| Further details — not scored | ||
| Size | 20 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Baydin Inc. | RD Concepts |
Customer experience
Owl Decide
Adam's Calc
In-app purchases
Owl Decide
No in-app purchases
Adam's Calc
- Remove Advertising$2.99









