Squid: Take Notes, Markup PDFs

Paper notes and PDF files solve different parts of the same problem, and moving between them is where I usually lose time. A lecture handout arrives as a PDF, my comments belong in the margins, and a few minutes later I am searching for a pen, opening another app, or trying to remember which page contains the important diagram. Squid: Take Notes, Markup PDFs is built around removing that repeated friction. It gives handwritten notes, document markup, and sharing a common workspace instead of making me treat them as separate jobs.

I reviewed it as a productivity app rather than as a digital notebook with endless decoration. That distinction matters. Squid is most convincing when I want the physical feeling of writing on a page while keeping the result easy to store, edit, and send. It is less compelling if my priority is a large database of linked text notes, advanced team collaboration, or a highly automated research system. My overall impression is that it is a focused tool from Steadfast Innovation, LLC, with a clear purpose: make handwriting useful on a mobile device.

Why Squid is useful when notes and documents keep getting separated

The recurring problem is not simply “I need to take notes.” It is that the information I need is often already somewhere else. A teacher shares slides, a manager sends a form, or a colleague provides a PDF to review. Writing comments in a separate notebook creates a second location, while typing into a plain document can feel awkward when the source contains sketches, arrows, equations, or a layout that should remain visible.

Squid handles that situation by treating the page as a surface rather than a text field. I can write directly on a note page and mark up a PDF in the same general style. That makes it especially natural for students, people reviewing documents, and anyone who thinks faster with handwriting than with a keyboard. The app is free to start, carries an Everyone content rating, and includes optional in-app purchases ranging from about one dollar to roughly fifteen dollars per item.

Its long presence also gives it some useful context. The app first appeared on March 28, 2012, and it has grown into a widely used Android productivity option with over ten million installs. Its average rating sits at 4.1 from around seventy thousand ratings, alongside roughly six thousand written reviews. Those figures do not replace personal testing, but they suggest that the basic idea has found a substantial audience rather than being a niche experiment.

What I like most is the reduction in small decisions. I do not have to decide whether a thought belongs in a handwriting app, a PDF editor, or a sharing tool before I begin. I can start with the page in front of me and choose the appropriate form of note as the work develops. That sounds minor, but repeated interruptions are exactly what make short study or review sessions feel inefficient.

The first setup is simple, but the important choice is how you organize pages

My first useful setup was not about changing every visual option. It was about creating a small structure that matched the work I actually do. I would keep class or project material together rather than making a new, isolated note for every thought. That way, a handwritten explanation, a marked document, and a follow-up checklist can remain connected in a way that feels closer to a physical folder.

The best starting point is to test both blank notes and imported documents before committing to a workflow. Blank pages are comfortable for free-form writing, diagrams, and quick planning. PDFs are better when the source itself needs attention. If I am reviewing a contract, worksheet, presentation, or reading assignment, writing on the original page saves the mental effort of copying references into a separate note.

I also recommend deciding early whether a page is meant for temporary thinking or long-term reference. A quick scratch page can stay loose and informal. A study page benefits from a consistent title and a predictable order. This small distinction prevents the common digital-notebook problem where everything is saved but nothing is easy to find later.

One practical tip is to use handwriting for decisions and short explanations, not for every word. When I annotate a document, I mark the important passage, add a brief reason, and move on. Trying to reproduce an entire article by hand defeats the advantage of working on a digital copy. Squid is strongest when the handwriting adds judgment, emphasis, or visual context.

Another useful habit is to leave room around dense material. A PDF page may look spacious on a large screen but become crowded on a phone. I find it easier to write a concise note in a clear margin or on a separate page than to force several lines into a tiny gap. This is one of the trade-offs of digital markup: the canvas is flexible, but readability still depends on restraint.

How it fits into real study and work routines

Imagine a student receiving a lecture PDF shortly before class. Instead of printing it or opening a separate document, the student can keep the handout visible and write short explanations beside the diagrams. During class, an arrow can connect a spoken explanation to the exact part of the page it clarifies. Afterward, the marked document is more useful than a page of disconnected notes because the original context remains attached.

I can see the same workflow working for a tutor preparing feedback. Rather than rewriting a student’s work, the tutor can point to a sentence, circle an issue, and add a handwritten suggestion. The visual relationship between the comment and the original text makes the feedback faster to understand. It also avoids the impersonal feeling of a long list of corrections detached from the work being discussed.

For office tasks, the value is similar. I might receive a form that needs checking, mark the fields that require attention, and share the annotated result instead of composing a separate explanation. A project planner can sketch a rough sequence, revise it by writing over the page, and keep the evolving idea visible. These are not glamorous use cases, but they are exactly where an app like this can save repeated small steps.

It is also useful for personal planning when typing feels too formal. I can sketch a weekend plan, draw a quick room layout, or write a short list beside a rough diagram. A conventional notes app is usually faster for a long typed list, but Squid becomes more natural when the note includes shapes, spatial relationships, or visual emphasis.

The app is not limited to serious work in my experience. The store positions it for class, work, or fun, and that breadth makes sense. Handwritten journaling, casual drawing, and visual brainstorming fit the same page-based approach. Still, I would not choose it simply because it can hold any kind of note. Its real identity comes from the combination of handwriting and document markup.

What friction it removes compared with ordinary alternatives

The usual alternative is a paper notebook. Paper still wins for instant freedom, zero battery concerns, and a familiar writing feel. Squid wins when the note must travel with a digital document or be shared without scanning. I can keep the original page and my comments together, which is much cleaner than photographing loose paper or trying to decipher notes from several notebooks.

A typed notes app has a different advantage: search, fast editing, and efficient long-form writing. If I am building a reference library made mostly of paragraphs, I would rather use a tool designed around text. Squid is a better fit when the shape of the information matters. A handwritten arrow, a circled detail, or a quick sketch can communicate a relationship that takes several typed sentences to describe.

Dedicated PDF editors may offer a more document-centered experience, particularly for people who need extensive form handling or formal review processes. Squid feels more approachable when the PDF is part of a broader handwritten workspace. The choice depends on the job: if I am signing, restructuring, or processing documents in a highly standardized workflow, a specialized editor may be the more efficient option.

There is a less obvious benefit in the way handwriting changes my attention. Typing often encourages me to transcribe. Writing by hand forces me to select what matters. When I annotate a reading, I tend to leave shorter, more personal observations instead of producing a duplicate version of the source. That makes the final page more useful for revision because it contains my interpretation rather than a wall of copied text.

Sharing is another practical part of the experience. The store summary specifically highlights sharing, and that matters because an annotation is often created for someone else. A marked page can communicate priority quickly: a circle shows where to look, an arrow shows how two points connect, and a brief handwritten note preserves the tone of a direct explanation. I would still check the final page at a comfortable zoom before sending it, especially when several marks overlap.

Small workflow decisions that make a noticeable difference

My first advanced tip is to separate “capture” from “polish.” During a meeting or lecture, I write quickly and accept uneven spacing. Later, I can add a short heading or clarify an abbreviation. Trying to make every line neat while listening creates more friction than the app is meant to remove.

Second, I use visual marks consistently. For example, a box can mean an action, a circle can mean a question, and an underline can mean a key idea. The exact system is personal, but keeping it stable turns a page into a quick visual index. This is more valuable than filling notes with decorative formatting that does not help me return to them.

Third, I treat PDF markup as a conversation with the source document. I do not cover important text with large notes, and I avoid placing comments where they could be mistaken for original content. Clear margins and restrained marks make a shared document easier for another person to read. This is a genuine trade-off: the freedom to write anywhere does not remove the need for editorial judgment.

A fourth tip is to test the sharing result with a short page before preparing a large packet. Different documents have different visual density, and an annotation style that looks comfortable on one page can feel cramped on another. A quick test helps me catch illegible handwriting, crowded margins, or marks that do not stand out enough.

Finally, I would not rely on a single giant notebook for everything. A large catch-all space feels convenient at first, but it makes later retrieval harder. Separate notebooks or clearly named groups for school, work, and personal projects keep the handwritten freedom without turning the app into a digital drawer full of unrelated pages.

Where the experience becomes less comfortable

Handwriting on a phone screen is the biggest limitation. It can work for short annotations, but extended writing is more comfortable on a larger display or with a suitable stylus. Fingers are less precise, and cramped screens make detailed diagrams or dense notes tiring. If your main device is a small phone and you expect to write several pages every day, I would test that experience carefully before moving your entire workflow.

There is also a learning curve in choosing the right balance between free-form writing and organized notes. The app makes it easy to place marks on a page, but that freedom can produce messy documents if I do not use headings, spacing, or a consistent visual language. The problem is not that Squid lacks flexibility; it is that flexibility shifts some organizational responsibility to me.

People who need advanced text search across a large knowledge base may find a typed, database-style notes app more efficient. Likewise, users who expect extensive collaboration, synchronized team editing, or a formal document-management system should compare those needs against Squid’s handwriting-first design. I would skip it if my work is almost entirely long typed notes or if every document must follow a strict professional markup process.

The optional purchases are another consideration. The app is free, which makes it easy to try the core experience, but some users may eventually want capabilities beyond the basic starting point. Since the available items range from about one dollar to about fifteen dollars each, I would decide based on a real workflow rather than buying extras immediately. First confirm that writing on screen genuinely saves time for you.

One question many people have is whether this can replace paper completely. For me, no. It replaces paper best when the note belongs beside a digital document or needs to be shared. Paper remains more relaxing for unrestricted sketching and can be more comfortable for long sessions. I see Squid as a practical bridge between paper habits and digital files, not as proof that every notebook should disappear.

Another question is whether it is suitable for children or general family use. The Everyone rating makes it broadly accessible from a content standpoint, and the simple page metaphor is easy to understand. However, the best experience still depends on the device, screen size, and whether the user has a comfortable way to write. Accessibility in age rating does not guarantee equal physical comfort for every user.

For my final question—whether it is worth trying—the answer is yes if your repeated problem is annotating PDFs, writing visual notes, or sharing handwritten explanations. Steadfast Innovation, LLC has kept the product focused on that intersection instead of forcing handwriting into a purely typed-note model. The result is not perfect, but it is coherent.

My verdict is that Squid saves time by keeping the source page and the handwritten response together. It removes the need to print, copy references, or explain every visual comment in a separate message. The trade-off is that its strengths depend on a suitable screen, a reasonably organized notebook habit, and a genuine preference for handwriting. With over ten million installs and a 4.1 average, it has clearly earned a substantial place in Android productivity, but its real value is personal: if your work is visual and document-based, it can make everyday review feel much less fragmented.