Squid: Take Notes, Markup PDFs

Analysis by All-app

When I need to turn a phone or tablet into something closer to a paper notebook, Squid: Take Notes, Markup PDFs is one of the more convincing options I have used. It is a free productivity app from Steadfast Innovation, LLC, built around handwritten notes rather than forcing every idea into a keyboard-first layout. That difference matters most when I am working through a lecture, marking up a document, sketching a quick diagram, or writing down a thought that would feel awkward in a standard text editor.

My first impression is that Squid makes sense when the starting point is messy. I can begin with a blank page, write naturally, and organize the result later. It feels less like a miniature word processor and more like a digital pad that happens to make sharing and document work easier. The app is rated for Everyone, costs nothing to download, and has become widely used, with over ten million installs. Its average rating sits at 4.1 from around seventy thousand ratings, which matches my overall view: it is useful and approachable, but the experience depends heavily on the device, stylus, and workflow I bring to it.

From a blank page to a usable set of notes

In this section, I look at how a loose handwritten thought becomes a note I can actually return to: choosing a page with its purpose in mind, then adding only the structure that helps me understand it later. I also consider the point where a private scribble needs clearer labels before it can be useful to someone else.

Starting with the right kind of page

I get the most from Squid when I decide in advance what the note is for. A quick meeting record, a worked maths problem, a reading annotation, and a rough drawing should not all be treated the same way. Starting with a dedicated notebook or page for each purpose keeps the app from becoming a pile of unrelated handwriting. This is a small habit, but it makes the later handoff much easier.

The blank-page approach is especially comfortable for people who think spatially. I can place a heading near the top, leave room for a diagram, circle an important phrase, and add an arrow without rebuilding the entire page. In a conventional notes app, those actions often require separate formatting controls. Here, the page itself is the main workspace, so the structure follows the way I write rather than the way a form expects me to write.

For a student, that can mean keeping one notebook for a class and using a fresh page for each lesson. For work, I would use separate pages for an agenda, decisions, and follow-up tasks. I would not rely on handwriting alone for information that must later be searched, copied into a spreadsheet, or reused in a long report. Squid is strongest at capturing and understanding information, not at replacing every text-based productivity tool.

A realistic class-to-study workflow

Imagine I am attending a class with a PDF handout. I open the document in Squid, move through it at the pace of the lesson, and write beside the sections that need explanation. Instead of copying whole paragraphs, I can mark the key sentence, add a short handwritten example, and draw a connection to a later page. That produces a record of how I understood the material, not merely a duplicate of the handout.

After class, I review the pages and add a small visual hierarchy. I might underline definitions, box a formula, and place a question mark beside something I still need to check. This second pass is where the app becomes more than a digital photocopy. The PDF remains the source material, while my annotations show what mattered, what confused me, and what deserves another look.

A useful tip is to keep the first pass deliberately quick. Trying to make every line neat while someone is speaking slows me down and can make me miss the explanation. I prefer rough handwriting during the session, followed by a short cleanup pass later. Squid supports that paper-like rhythm better than a keyboard-based editor because I can add marks directly where my attention already is.

Using handwriting for thinking, not just recording

The app also works well for planning. I can sketch a timeline, draw boxes around competing ideas, and move through a problem visually. This is where a stylus makes a major difference. With a responsive pen and a comfortable screen, writing feels direct enough for short sessions. With only a finger, precise annotation becomes tiring, and the experience shifts from natural handwriting to careful tracing.

I would therefore treat the hardware as part of the decision. Someone who already owns a tablet and stylus may find Squid immediately useful. A person using a small phone without a pen may still benefit from quick marks, but should not expect the same comfort as writing on a larger display. Screen size also affects PDF work: a dense page can require frequent zooming, and that interrupts the flow when I am trying to follow a presentation or read technical material.

One of my preferred workflows is to use a page as a visual inbox. I write down ideas without interrupting the task, then later sort them into cleaner notes or another app. This avoids the common mistake of trying to organize every thought at the exact moment it appears. Squid is particularly good at that first capture because handwriting is fast, flexible, and forgiving of incomplete sentences.

Moving from capture to review

Once the initial note exists, I look at it as a working document rather than a finished product. I can add emphasis, correct a label, or extend a diagram without recreating the page. That makes revision less intimidating than editing a polished typed document. The visual history of the page also helps me remember the original context, which is valuable when I return to notes several days later.

For revision, I would use a consistent marking system. A star can identify an important idea, a question mark can show uncertainty, and a box can reserve something for memorization. The exact symbols are up to me, but consistency turns a collection of handwriting into a review method. This is a more advanced use than simply writing everything down, and it is one reason I would recommend the app to learners who prefer visual study.

There is a trade-off, though. Handwritten pages can become visually crowded quickly. If I keep adding arrows and comments without leaving space, the page becomes harder to review than the original document. Squid gives me freedom, but freedom also requires discipline. I get better results when I leave margins, use separate pages for major topics, and avoid treating every available area as space that must be filled.

Handing notes to another person

The real test comes when the note leaves the app. A student may need to send annotated material to a classmate. A colleague may need to share a marked document after a meeting. In these situations, I want the result to be readable by someone who was not present while I wrote it. Before sharing, I review the page at normal viewing size rather than assuming that every small handwritten detail will remain clear.

This handoff changes how I write. During private note-taking, shorthand is fine. For a shared document, I add a short title, clarify abbreviations, and make sure important marks are not hidden in the margins. I also prefer one purpose per shared file. Sending a complete notebook when the recipient only needs two annotated pages creates unnecessary friction and makes the useful information harder to find.

Squid’s ability to work with PDF markup is the central advantage here. A regular drawing app can place ink on a canvas, but it is not necessarily designed around reading and annotating documents. A text notes app is better for searchable paragraphs, but less natural when I need to point at a sentence, circle a figure, or write between existing sections. Squid sits between those approaches, and that position is what makes it distinctive.

It is also worth deciding whether the recipient needs editable working notes or a finished document. For a quick exchange, an annotated page may be enough. For formal work, I would inspect the final output carefully before sending it, especially if the document contains small handwriting, dense diagrams, or marks close to the page edge. The handoff is successful only when the other person can understand the result without asking me to explain every symbol.

What the finished result feels like

At the end of a good session, I have something more useful than a typed transcript: a visual record of the important material and my response to it. For studying, that can make review faster because the page preserves emphasis and relationships. For work, it can show decisions directly on a proposal or agenda. For personal projects, it can keep sketches and written reminders together without forcing a rigid template.

I especially like the outcome when the original material is already in PDF form. The document provides the structure, while my handwriting adds context. This avoids switching between a reader and a separate notes app, which is a small but meaningful reduction in mental overhead. I can stay focused on the document instead of remembering which page in another app contains each comment.

That said, the result is not automatically polished. Handwriting varies from person to person, and a page that looks clear to me may be difficult for someone else to read. Squid does not remove the need for editing judgment. I still need to check spacing, legibility, and the order of ideas before treating an annotated page as a final deliverable.

Where the workflow breaks down

The first weak point is long-form typed writing. If I need several pages of carefully structured prose, a conventional document editor is more efficient. Squid can capture the outline or handwritten draft, but I would not choose it for a report that depends on fast text entry, extensive revision, or precise formatting. Its strength is the page as a visual surface, not the paragraph as a publishing unit.

Search is another practical consideration. Handwriting is excellent for memory and spatial thinking, but it is not as immediately reusable as typed text. If I know that I will later need to find every mention of a particular term, copy a passage, or reorganize content into a database, I start in a text-first tool instead. Squid can be part of that workflow, but it should not be mistaken for a full replacement.

There can also be friction when a PDF is complex. A document with tiny text, multiple columns, forms, or crowded graphics leaves less room for comfortable annotation. Zooming helps, but repeated zooming and panning can break concentration. My workaround is to annotate only the sections that matter and add a separate page for longer explanations rather than trying to squeeze every thought into the original margins.

Device comfort is equally important. On a larger tablet with a stylus, the app feels much closer to a real notebook. On a phone, I use it for short notes and quick marks rather than extended writing. Finger input works for occasional gestures, but I would skip Squid as a primary handwriting tool if I dislike writing on glass or if my device makes precise strokes uncomfortable.

Who should use it, and who should choose something else

I would recommend Squid to students, teachers, visual planners, and anyone who regularly reads documents while adding personal explanations. It is also a good fit for people who have tried typed notes and found that they remember less because the process feels too mechanical. The free entry point makes it easy to test the workflow without committing to a paid productivity suite.

I would be more cautious for users whose work depends on collaboration, live text editing, or deep document management. If several people must revise the same content continuously, a shared text editor may be the better center of the workflow. If the main requirement is task tracking, a dedicated task manager will provide clearer status fields and reminders. If the goal is professional page design, a document or layout tool will offer more control.

The app includes optional in-app purchases priced from one dollar to fourteen dollars and ninety-nine cents per item. I see that as a reason to begin with the free experience and decide whether the basic workflow already solves the problem. I would not pay simply because handwriting feels appealing; I would pay only if the additional capabilities fit a repeated need in my study or work routine.

My final view after using the complete workflow

Squid succeeds because it respects the difference between writing and typing. I can start with a rough thought, attach it to a page or document, develop it with marks and diagrams, and pass the result to someone else without rebuilding everything in another tool. That end-to-end path is the app’s real value. It turns a tablet into a practical notebook while keeping PDF annotation close at hand.

My advice is to test it with one specific project rather than judging it from a blank page. Import a document you genuinely need to study, annotate only the important sections, review the result the next day, and share a small sample with another person. That experiment reveals the issues that matter most: whether the writing surface feels comfortable, whether your notes remain legible, and whether the finished handoff is useful.

Steadfast Innovation, LLC has built a focused productivity app rather than an all-purpose office suite. That focus is both its appeal and its boundary. I would choose Squid when handwriting, visual explanation, and PDF markup belong in the same session. I would choose a text editor, task manager, or collaborative workspace when typed structure and searchable content matter more. For the right device and the right workflow, Squid is a genuinely practical bridge between paper notes and digital documents, and its free price makes that bridge easy to try.