OrbitNote vs Number Line, by MLC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OrbitNote
This tool allows users to read, annotate, and listen to PDF documents. It converts image-based PDFs to accessible text and offers features like speech playback, highlighting, and iCloud sync for seamless document management across devices.
- Annotate PDFs with highlights, underscores, and notes
- Convert image PDFs to searchable text
- Listen to PDFs with human-quality voice playback
- Change background and text colors for readability
- Sync documents and annotations with iCloud
- Import/export PDFs from cloud storage and other apps
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OrbitNote is an accessible, reading and study PDF tool for all. Annotate, mark up, listen to and save PDF files which are then still fully compatible with other popular PDF apps. Have accessible text PDF files spoken back to you with human quality voice & synchronised highlighting. PDF image files or photographs of text can be converted to accessible, searchable PDF files and read in the app. + Speech, Productivity and Accessibility Alongside the full range of iOS system voices, OrbitNote comes with a range of high-quality voices in different languages. A ‘Speak in Background’ option lets you listen to a PDF while viewing another app - great for proofreading PDF files while you’re working in other apps. The ‘Speak on tap’ and ‘Stop on tap’ options make speech easy to control. + OrbitNote allows the background colour of the PDF to be changed, and text colour inverted, to enhance readability. OrbitNote fully supports VoiceOver. + Annotations, Notes and Comments OrbitNote includes a powerful Annotation toolbar that lets you add notes and other comments. These are fully interchangeable with most other popular PDF apps, so your OrbitNote comments will still be there if you open the PDF on another device. Annotations created in another PDF app can also be viewed and edited. Annotation features include: highlight; underscore; strikeout; notes; free text (type straight into the PDF); free line draw; shapes (circle, square, line - with many options); images (you can even insert photos from your iPad camera or photo library into the PDF file); audio and video. + Photos and Image PDF to Text PDF Conversion You can convert photos and other images to fully accessible text PDF files that can be spoken, searched, copied and highlighted. As well as converting photos, you can also convert any PDF Image file into a fully accessible Text PDF file. Along with making these PDF files accessible and searchable, it will also compress them, reducing file size. Further credit can be purchased in app. Photos and Image PDF to Text PDF Conversion in OrbitNote requires an internet connection. + Managing PDF Files PDF files can be opened in OrbitNote from all other apps, including Mail and Safari. All opened PDF files will be placed in the OrbitNote Documents List for later viewing. You can also open files from Google Drive, OneDrive, or import directly from your device. PDF files can be saved into OrbitNote Documents, OneDrive or Google Drive, sent by email, or opened in other apps that support PDF files. + Sync with iCloud You can sync ClaroPDF with your iCloud account. This lets you store and synchronise your PDF files and annotations across multiple devices. Sync with iCloud can also act as a document backup so you can keep your documents safe. + Switch Accessibility OrbitNote responds to switch or Bluetooth keyboard commands: 1 (~1) Start speech 2 (~2) Stop speech 3 (~3) Turn to previous page 4 (~4) Turn to next page + Fullscreen mode Allows the full document to be seen without toolbars in view. Ideal for smaller screens!
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 in-app purchases: Number Line, by MLC at none against OrbitNote's 10. Number Line, by MLC also leads on review sentiment (67% vs 50%). OrbitNote's advantage is update cadence (monthly vs every 13 months) and rating (4.7 vs 4.4). On price, ads and iOS requirement 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. OrbitNote sells 10 one-off in-app purchases. Number Line, by MLC asks for nothing beyond the download.
OrbitNote holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 60 and 15 respectively. Written reviews complicate that: 50% of OrbitNote's written reviews are positive against 67% of Number Line, by MLC's, so the app with the better star average is not the one people write more warmly about.
OrbitNote ships an update monthly, Number Line, by MLC every 13 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.
| Parameter | OrbitNote | Number Line, by MLC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (60 ratings) — better | 4.4 (15 ratings) |
| Positive reviews | 50.0% of reviews | 66.7% of reviews — better |
| Number of ratings | 60 — better | 15 |
| Update frequency | Monthly — better | Every 13 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 15.5 — better | 16.1 |
| Further details — not scored | ||
| Size | 252 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Everway Opco Ltd. | The Math Learning Center |
Customer experience
OrbitNote
Number Line, by MLC
In-app purchases
OrbitNote
- Krzysztof$1.99
- Joaquim$1.99
- 5000 Credits$3.99
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- Elise$3.99
- Valentin$3.99
- Elias$3.99
- Emilie$3.99
- Filip$3.99
- Freja$3.99
- Unlock ClaroPDF Pro$9.99
Number Line, by MLC
No in-app purchases
Questions
Is OrbitNote free?
Is Number Line, by MLC free?
Which has better reviews, OrbitNote or Number Line, by MLC?
Do OrbitNote or Number Line, by MLC have ads?
Which is updated more often, OrbitNote or Number Line, by MLC?
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