iCalcline vs Noteflow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iCalcline
This app is a modern algebra calculator for iOS that can solve complex math expressions with variables and functions. It offers a customized keyboard for easy input and displays results instantly. Users can create and manage an unlimited number of variables and constants.
- Evaluates complex algebraic expressions
- Supports variables and constants
- Customized keyboard for easy input
- Instant result display
- Unlimited variable and constant management
- Step-by-step solving option
- High precision calculations
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iCalcline is a modern algebra calculator for iOS It can solve math expression with any level of parenthesis and functions You can use algebraic expression with numeric values and or variables constant names You can use in expression the variables and constants you created in the internal tables: 'alpha=bravo+K_1' (bravo will be taken from the variable table, K_1 from the const table and alpha will be assigned or created in the variable table) You can create, manipulate, delete and use how many variables you like inside the app. The internal iOS keyboard provides helpers to insert available functions, variables, constants, operators. Result is displayed immediatly. KEY POINTS • Evaluates mathematical expressions with parentheses, nested functions, variables and constants • Easy to use • The user simply inserts an expression and iCalcline displays the result • Variable creation and reference inside expressions are very easy using an interactive list. FEATURES • Algebra made easy and simple • Manages any nested level of parentheses using the correct precedence • Check your expression syntax in advance signaling errors • Can use an internal variable and constant table with editable values • You can manages unlimited numbers of variables and constant you like in the internal tables. • You can use in expression the variables and constants you created in the internal tables: 'alpha=bravo+K_1' (bravo will be taken from the variable table, K_1 from the const table and alpha will be assigned or created in the variable table) • Customized keyboard with Functions, variables table, constants table and frequent used symbols available to insert with a single touch • Can change on the fly calculation precision (up to 9 decimals thanks to use of long double calculation) • Variable font sizes • Select a variable or a value and inserting a function will wrap it inside the function parenthesys • Uses decimal and group separator in accordance with your local settings • Full log of executed calculations • Optional step by step solving showing all the mathematical passages in the log. • Retains values over successive re-launch • DEG° and RAD calculation for trigonometric functions • Based on a custom fast calculation engine and used also on macOS in Calcline and TS Calc (available on the Mac App Store). • Uses long double calculation (High precision with up to 9 decimal digit precision) • Works great in Portrait and Landscape mode • Works great on iPad as SlideOver FACILITIES: • A calculation area where you can insert algebraic expressions and immediatly see the result as you type • A Variable table where you can insert infinite variables with custom values, Variables can be created as result of calculations (x=1+1) will create automatically the variable x inside the table assigning the value = 2 • A constant table with constant value usable in calculations. Off course constant can't be assigned by calculation • A log with all the result , available step by step or in concise format AVAILABLE FUNCTIONS sqrt cbrt sin cos tan asin acos atan sinh cosh tanh asinh acosh atanh log log10 exp, exp2 expm1 abs ceil floor pow
Noteflow
This app offers a digital notebook experience designed to replace pen and paper. It allows for note-taking, PDF annotation, sketching, and freeform idea capture with vector ink that scales without quality loss. Seamlessly integrate real-world content and organize your thoughts digitally.
- Digital notebook replacement for pen and paper
- Annotate PDFs and sketch freely
- Convert real-world images to vector ink
- Fluid editing without traditional layers
- Drag-and-drop integration with iOS
- Cloud storage synchronization
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Noteflow is designed to replace pen and paper. It is a modern digital notebook that lets you get the most from your iPad and iPhone. Use it for taking notes, annotating PDFs, sketching and doodling, plus a whole lot more: Copy and paste from the real world: Use Inkport gen 2 to snap a picture of a whiteboard or writing and convert it into Noteflow's native vector ink. No special paper needed. Then resize, re-color, or edit as if you wrote it in Noteflow. Create layered drawings without layers: Use the highlighter tool to color and shade behind existing ink. Use Color-Select to separate and edit individual colors. It's a much more fluid and natural editing experience than with layers. Use the straight-line tool with a grid for fast and intuitive wireframes and drafting. Drag-and-drop, cloud-storage, and more: Noteflow natively integrates with iOS's file system and drag-and-drop capabilities. Drop photos and text into Noteflow, and drag your drawings into other apps. Store your files locally or sync with the cloud service of your choice. Make Noteflow a seamless part of your workflow, the way you like. SPACE FOR YOUR IDEAS TO ROAM Our vision for Noteflow is simple: to be digital pen and paper. The magic of pen and paper is in their versatility. They are useful for so many things, but particularly for the freeform capture of ideas. Noteflow expands upon this quality. You can naturally do all the things you normally do with pen and paper: take notes in meetings or class, and jot down flashes of inspirations on the go. And you can take that to a whole new level: One of Noteflow’s best uses is for "thinking on digital paper": quickly capture key ideas and concepts, then move and organize them on the screen. Noteflow's vector ink engine lets you scale and edit your work without any loss of quality. Your words and drawings remain tack sharp when zoomed in, giving you a huge effective working canvas even on a single page. There are analogues in the physical world, such as sketchnotes or everyday working on a white board, but being able to fluidly edit and move your ideas around the page is something you can only do digitally. When you represent the ideas in your head with your own personal scribbles on the screen, it effectively becomes an extension of your mind - giving you more room to think. We've designed every part of Noteflow to let you intuitively capture and work on your ideas the way you like. Whether it's dropping in existing information, quickly sketching concepts, or assembling polished presentations for others. EVALUATE NOTEFLOW RISK FREE Rather than just read about Noteflow, go ahead and try it out: We've decided to make the Basic Edition completely FREE. The Basic Edition is a full featured note-taking and sketching app. It comes with the Fountain Pen with black ink, photos, and a standard set of 5 popular fonts for text. Books max out at 20 pages each, but you can create as many as you like. NOTEFLOW+ Upgrade instantly at any time to get: + Inkport + Import and annotate PDFs + A customizable, full color palette, + The Marker, Write-Behind Highlighter and Straight Line tools. + Rotate, Cut, Copy, Paste Ink, and Page Management, + Notebooks with unlimited pages, + Page backgrounds and sizes, + An additional 50+ fonts, + And more! Learn more in the in-app Quickstart Guide. DIGITAL TOOLS FOR A DIGITAL AGE I hope you'll find Noteflow a useful part of your workflow, and that you'll discover new ways to do things with it that weren't easy before. We're very proud of the work we've put into Noteflow, but we're also just seen the beginning of what's possible with powerful new digital platforms like the iPad. Our goal is to push these platforms to their limits to craft useful tools. Tools that can help us think a little more clearly, communicate a bit more effectively, and connect with other in new and enriching ways. Thanks for joining us on this journey! -- The App Makers @ Qrayon.
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Verdict
The clearest difference is review sentiment: Noteflow at 47% against iCalcline's 0%. Noteflow also leads on price (Free vs $0.99) and rating (4.2 vs 1.0). On ads, 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
Noteflow is free to download; iCalcline costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Noteflow holds the better App Store score, 4.2 against 1.0. That said, the two scores are not equally well evidenced: Noteflow has 182 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of iCalcline's written reviews are positive against 47% of Noteflow's.
iCalcline ships an update every 24 months, Noteflow every 6 weeks. The most recent releases landed on September 28, 2026 and October 10, 2026 respectively.
| Parameter | iCalcline | Noteflow |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (1 ratings) | 4.2 (182 ratings) — better |
| Positive reviews | 0.0% of reviews | 46.7% of reviews — better |
| Number of ratings | 1 | 182 — better |
| Update frequency | Every 24 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.4 — better |
| Further details — not scored | ||
| Size | 1 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Roberto Panetta | Qrayon, LLC |
Customer experience
iCalcline
Noteflow
In-app purchases
iCalcline
No in-app purchases
Noteflow
No in-app purchases









