Comparison

Number Line, by MLC vs BOT Spelling

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

BOT Spelling

This app helps high school students prepare for the Proofreading section of the Texas UIL Spelling contest. It presents word groups, requiring users to identify and correctly spell misspelled words, reinforcing learning until mastery.

Highlights
  • UIL Proofreading section preparation
  • Identify and spell misspelled words
  • Incorrectly spelled words repeat
  • Progress tracking
  • Full content subscription
Features
Read full description

Get ahead of the game and on your way to being a champion! Best of Texas Contest's Spelling: Proofreading for high school students helps you learn all the words for the Proofreading section of the Texas UIL Spelling contest. Select the incorrectly spelled word from a group of five words and type in your spelling. Incorrectly spelled words stay in the mix until you have spelled them correctly. Track your progress as you go. A fun and convenient way to learn the words for the High School UIL Spelling & Vocabulary contest. Access to full content requires a subscription. A school-year subscription gives you access to all High School spelling words for the current school year UIL contest.

Screenshots

BOT Spelling4 screens

Verdict

The call

The clearest difference is review sentiment: Number Line, by MLC at 67% against BOT Spelling's 0%. Number Line, by MLC also leads on monetization model (free vs subscription). BOT Spelling's advantage is device support (3 vs 1) and iOS requirement (12.0 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Number Line, by MLC ships an update every 13 months, BOT Spelling every 7 months. The most recent releases landed on October 9, 2026 and October 29, 2026 respectively.

Scorecard4 real differences · 6 level
Number Line, by MLC versus BOT Spelling: the parameters behind the verdict, then further details
ParameterNumber Line, by MLCBOT Spelling
PriceFreeFree
Rating4.4 (15 ratings) — better—
Positive reviews66.7% of reviews — better0.0% of reviews
Number of ratings15 — better—
Update frequencyEvery 13 monthsEvery 7 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterSubscription
DevicesiPadiPhone, iPad, iPod — better
Requires iOS16.112.0 — better
Further details — not scored
Size7 MB36 MB
Age rating4+4+
DeveloperThe Math Learning CenterPeggy Markham

Customer experience

Number Line, by MLC

All ratings15 ratings
Positive86.7%
Neutral0.0%
Negative13.3%
Written reviews12 reviews
Positive66.7%
Neutral16.7%
Negative16.7%

BOT Spelling

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Number Line, by MLC

No in-app purchases

None

BOT Spelling

No in-app purchases

Questions

Is Number Line, by MLC free?
Number Line, by MLC is free to download, with no in-app purchases.
Is BOT Spelling free?
BOT Spelling is free to download, with no in-app purchases.
Do Number Line, by MLC or BOT Spelling have ads?
Neither Number Line, by MLC nor BOT Spelling shows ads.
Which is updated more often, Number Line, by MLC or BOT Spelling?
Number Line, by MLC ships an update every 13 months, and BOT Spelling every 7 months. Most recently, Number Line, by MLC was updated on October 9, 2026 and BOT Spelling on October 29, 2026.

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