Solve the Outbreak vs Number Line, by MLC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Solve the Outbreak
Become a Disease Detective and solve simulated outbreaks by analyzing clues and data. Make critical decisions to contain diseases and save lives, earning badges and climbing ranks. Learn about real-world disease investigation in an engaging, game-like experience.
- Solve simulated outbreaks
- Analyze clues and data
- Make critical decisions
- Earn badges and ranks
- Learn about diseases
- Challenge friends
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Your mission, if you choose to accept, is to get clues and analyze data to solve the outbreak and save lives! In this fun app, you get to be a Disease Detective. Do you quarantine the village? Interview people who are sick? Run more lab tests? The better your answers, the higher your score - and the quicker you’ll climb the ranks to become a decorated Disease Detective. In level 1, you’ll start as a Trainee and earn badges by solving scenarios — with the goal of earning the top rank: Disease Detective. Unlock Level 2 by mastering all the 12 outbreaks of Level 1. Then earn honors by solving new and more challenging scenarios. Earn recognitions like Surveillance and Treatment Honors. New outbreaks happen every day and CDC's Disease Detectives are on the front lines — working 24/7 to save lives and protect people. When a new outbreak occurs, Disease Detectives are sent in to figure out how the outbreak started before it spreads further. In this app, you'll also: • Learn about diseases and outbreaks in an engaging way. • See how CDC's Disease Detectives save lives around the world. • Have the option to post your scores on Facebook or Twitter and challenge your friends to play!
Number Line, by MLC
This app allows students to visualize number sequences and demonstrate mathematical strategies. It supports various number types and offers tools for annotation, problem-solving, and sharing work. Ideal for elementary classrooms and iPad learning environments.
- Visualize number sequences
- Demonstrate counting, adding, subtracting, multiplying, dividing
- Use whole numbers, fractions, decimals, or negative numbers
- Add custom tick marks and labels
- Hide and reveal numbers and jumps
- Annotation and drawing tools
- Save and share work
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Number Line helps students visualize number sequences and demonstrate strategies for counting, comparing, adding, subtracting, multiplying, and dividing. Choose number lines labelled with whole numbers, fractions, decimals, or negative numbers. Or use a blank number line, with or without tick marks. Describe intervals between points on the line using forward or backward jumps above and below the line. Jumps can be labelled with their values or left blank. Add custom tick marks to the number line to show equivalence or compare number values. Show strategies with drawing and annotation tools. Hide elements of the sequence shown on the number line, which challenges students to use what they know about number relationships and computation to identify those missing elements. This virtual number line is an open-ended educational tool, ideal for elementary classrooms and other learning environments that use iPads. For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps FEATURES • Mark the number line with multiples of whole numbers, fractions, or decimals. In addition, set the starting value of the line, including using negative values. • Add and manipulate forward and backward jumps, above or below the line. • Label jump bars, manually or automatically, to show intervals or hide labels altogether. • Add custom tick marks and values to blank number lines. • Hide and reveal numbers on the number line. • Hide and reveal jumps, numbers, and other elements with resizable covers to create your own problems and model strategies. • Use the drawing tools to annotate work and show understanding. • Add equations, expressions, and descriptions with the math text and writing tools. • Share your work by saving an image or providing a share code to others. MORE APPS For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps LEARN MORE To learn about Bridges in Mathematics, an elementary curriculum that employs visual models like number line, visit: www.mathlearningcenter.org/bridges/overview ABOUT US This resource is brought to you by The Math Learning Center, a nonprofit organization dedicated to K-12 education since 1976. ACKNOWLEDGEMENTS This app was crafted by Clarity Innovations. We help improve teaching and learning by creating solutions that match promising technologies with the needs of education. Visit us: www.clarity-innovations.com
Verdict
The clearest difference is review sentiment: Solve the Outbreak at 96% against Number Line, by MLC's 67%. Solve the Outbreak also leads on rating (4.6 vs 4.4) and update cadence (every 5 months vs every 13 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Solve the Outbreak holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 61 and 15 respectively. Written reviews point the same way: 96% of Solve the Outbreak's written reviews are positive against 67% of Number Line, by MLC's.
Solve the Outbreak ships an update every 5 months, Number Line, by MLC every 13 months. The most recent releases landed on November 3, 2026 and November 1, 2026 respectively.
| Parameter | Solve the Outbreak | Number Line, by MLC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (61 ratings) — better | 4.4 (15 ratings) |
| Positive reviews | 95.7% of reviews — better | 66.7% of reviews |
| Number of ratings | 61 — better | 15 |
| Update frequency | Every 5 months — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPad |
| Requires iOS | 12.0 — better | 16.1 |
| Further details — not scored | ||
| Size | 258 MB | 7 MB |
| Age rating | 12+ | 4+ |
| Developer | Centers For Disease Control and Prevention | The Math Learning Center |
Customer experience
Solve the Outbreak
Number Line, by MLC
Bugs and requests
Solve the Outbreak
Reported bugs
3 issues- App crashes when attempting to reset scores in settings
- Old scores and progress remain after reset attempt
- Accidental question selection due to bottom screen placement
Requested features
10 requests- Add more outbreak cases and scenarios
- Create harder difficulty levels for advanced players
- Include visual aids and images for better understanding
- Add background music and sound effects
- Implement branching storylines with different outcomes
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- Create Level 3 with more complex cases
- Add ability for users to create custom outbreaks
- Improve text size and readability on smaller screens
- Release app on iPhone in addition to iPad
- Include more historical and special plague scenarios
Number Line, by MLC
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Solve the Outbreak
No in-app purchases
Number Line, by MLC
No in-app purchases
Questions
Is Solve the Outbreak free?
Is Number Line, by MLC free?
Which has better reviews, Solve the Outbreak or Number Line, by MLC?
Do Solve the Outbreak or Number Line, by MLC have ads?
Which is updated more often, Solve the Outbreak or Number Line, by MLC?
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