Arithmus vs Keep R
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Arithmus
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Challenge your brain and sharpen your logic with Arithmus, the number puzzle game that turns arithmetic into an addictive strategy challenge. You are given 7 Playing Numbers and a single Goal Number. Using basic operators (+, −, ×, ÷), your goal is to build an equation that gets as close to the Goal Number as possible. - Each playing number can only be used once. - Combine numbers creatively across multiple lines to build complex results. - Reach the exact goal for a massive score bonus! Features: - Daily Challenge: Complete a custom challenge each day, and compete with your friends on the same puzzle! - Progression System: Earn XP for every equation and build up your levels - Difficulty Selector: Choose between Easy and Normal difficulty to cater the challenge to your liking - Intuitive Interface: Simple and easy-to-navigate UI with smooth animations and haptics - Multi-Line Equations: Build equations that span multiple lines to crunch big numbers. - Track Your Stats: Keep a tally of your best games and total equations solved, week by week. - Streaks: Play a puzzle every day and maintain a daily streak. Upgrade to Arithmus Premium to unlock the full potential of your brain training: - Unlimited Gameplay: Play as many puzzles as you want with no daily game limit - Ad-Free Experience: Enjoy uninterrupted focus with zero advertisements. - Support Development: Directly support the future features of Arithmus. Whether you're a math whiz looking for a challenge, bored on your daily commute, or just want to keep your mind sharp, Arithmus is your perfect daily dose of brain training. Download Arithmus today and start solving! Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://arithmus.com.au/privacy-policy
Keep R
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Protect the egg for 60 seconds! Defend a single egg from endless incoming threats. From archers' arrows and tank barrages to lightning strikes, meteors, and mysterious aliens—the attacks targeting the egg never stop. Use a variety of skills in critical moments and dodge incoming assaults to protect the egg until the very end. Just 60 seconds. Your objective is simple: Keep the egg safe. Can you survive the 60 seconds and defend the egg? Key Features • A survival challenge to protect a single egg for 60 seconds • Endless waves of diverse threats • Powerful skills to overcome critical moments • Simple controls that anyone can pick up easily • Fast-paced, thrilling 60-second gameplay
Screenshots
Verdict
The clearest difference is ads: Keep R at none against Arithmus's shown. Arithmus's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, in-app purchases 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. Arithmus sells 2 in-app purchases, starting at $2.99 per month and Keep R sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Arithmus ships an update every 9 days, Keep R every 2 weeks. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.
| Parameter | Arithmus | Keep R |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days — better | Every 2 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 50 MB | 256 MB |
| Age rating | 4+ | 4+ |
| Developer | Arithmus Team | boyoung kim |
In-app purchases
Arithmus
- Premium (Monthly)$2.991 Month
- Premium (Yearly)$29.991 Year
Keep R
- Golden Egg$0.99









