Count Sort vs Number Line, by MLC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Count Sort
This app introduces young children to basic number concepts and counting. It helps them understand one-to-one correspondence and early numeral recognition with adjustable counting targets. An iPad version offers 10 Frames for visual counting.
- One-to-one counting practice
- Adjustable counting targets (up to 32)
- Early numeral recognition
- Number family recognition
- 10 Frames option (iPad)
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A very basic set of activities for children just beginning to learn about numbers. Using numbers up to 32, Count Sort helps children recognize that counting must be done in a “one-to-one” fashion. Options exist to limit the counting target to 10, 15, 20, 25, and 32 chips. The activities also develop early numeral recognition and early recognition of number “families.” The iPad version includes an option to display the chips in 10 Frames. Developed as part of the Number Sense Project at Augustana College in Rock Island, IL.
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
Screenshots
Verdict
The clearest difference is rating: Number Line, by MLC at 4.4 against Count Sort's 1.0. Number Line, by MLC also leads on review sentiment (67% vs 50%) and ratings volume (15 vs 1). Count Sort's advantage is device support (3 vs 1) and iOS requirement (10.0 vs 16.1). On price, update cadence, ads and in-app purchases 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.
Number Line, by MLC holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Number Line, by MLC has 15 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Count Sort's written reviews are positive against 67% of Number Line, by MLC's.
Count Sort ships an update every 7 months, Number Line, by MLC every 13 months. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.
| Parameter | Count Sort | Number Line, by MLC |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 4.4 (15 ratings) — better |
| Positive reviews | 50.0% of reviews | 66.7% of reviews — better |
| Number of ratings | 1 | 15 — better |
| Update frequency | Every 7 months — better | Every 13 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 10.0 — better | 16.1 |
| Further details — not scored | ||
| Size | 41 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Classroom Focused Software | The Math Learning Center |
Customer experience
Count Sort
Number Line, by MLC
In-app purchases
Count Sort
No in-app purchases
Number Line, by MLC
No in-app purchases
Questions
Is Count Sort free?
Is Number Line, by MLC free?
Which has better reviews, Count Sort or Number Line, by MLC?
Do Count Sort or Number Line, by MLC have ads?
Which is updated more often, Count Sort or Number Line, by MLC?
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