PERRLA vs Scribbr: free citations, or the whole paper

It's Sunday night, and this week's discussion post is due at midnight. You've done the reading and you know what you want to say. What's left is the citations. You paste each article's DOI into a citation generator, copy the reference, paste it under your post, then copy the in-text citation into the right sentence. Next week brings a new post and the same routine. A citation generator makes that reference line quickly and for free, and Scribbr's is one of the best known. The rest of the job, from the in-text citations to the formatting to a last check before you post, is where Scribbr and PERRLA part ways.

What Scribbr does

Scribbr started in 2012 as a proofreading and editing company. Today it's part of QuillBot, within the Learneo family of businesses. Most students know it for its free Citation Generator: search by title, URL, DOI, or ISBN, and it fills in the reference and the in-text citation. It offers APA, MLA, Chicago, Turabian, Harvard, AMA, IEEE, Vancouver, and other styles it says its experts have verified, plus more it labels unverified. A free extension for Chrome and Edge cites the page you're on. When you're signed in, your citations stay in lists and folders, and a list exports to Word or BibTeX or, with the extension, syncs into a Google Doc.

Around the generator, Scribbr sells help one job at a time: a Plagiarism Checker priced per document, an AI Proofreader sold as a 30-day pass, an APA Citation Checker, and human proofreading, citation editing, and paper formatting. It also has free AI writing tools (an AI Detector, a grammar checker, a paraphrasing tool, an AI Humanizer, and a summarizer) and a free Knowledge Base of clear explainer articles and short videos on citing sources, APA Style, and research writing.

What PERRLA does that Scribbr's generator doesn't

PERRLA starts from the paper rather than the citation, and it does the formatting while you write:

• Sets up the whole document in APA 7, MLA 9, or Turabian 9: title page, margins, spacing, page numbers, headings, and the references page or bibliography.
• Puts the citation where you are typing. Type an opening parenthesis in APA or MLA, pick the source, and the in-text citation lands in place. Nothing to copy, nothing to paste.
• Builds the references page from what you cited, alphabetized, with hanging indents, and keeps it in sync when you add, move, or delete a citation.
• Handles the weekly discussion post. Discussion posts are half of the papers students write in PERRLA. Start a Discussion Post, cite as you write, and in PERRLA Online click Copy paper to clipboard to paste the post, references included, into your course discussion board.
• Reads the finished paper against the format when you click I'm Finished: a citation after the period, a quote without its page number, a reference you never cited. It offers a one-click fix for most of what it finds, and it comes with every plan.
• Keeps one shared library of your references, their PDFs, and your notes, ready in PERRLA Online, Word, and Google Docs, so the sources from your Week 2 post are there for Week 5. The Chrome extension adds sources from 85+ research databases, with the PDF when there is one.

PERRLA's rule engine was written and tested by people against the APA, MLA, and Turabian manuals. It's deterministic: the same source gives the same reference every time.

Side by side

Where Scribbr is the better tool

We won't pretend PERRLA is better at everything. Scribbr is the better pick when:

• You need one quick citation and don't want an account or a subscription
• Your assignment uses a style PERRLA doesn't format, like Harvard, AMA, IEEE, or Vancouver
• You want a similarity check or an AI check on your paper before you turn it in. PERRLA doesn't do either.
• You want a person to proofread your writing or check your citations

Its free Knowledge Base also explains citation rules clearly, whichever tool you use.

Do you need both?

For citations, usually not. In PERRLA, the reference work happens inside the paper: you look a source up once, cite it as you write, and the references page follows, in every paper and discussion post that term. There are two common exceptions. A course that asks for a style PERRLA doesn't support needs a generator for that paper. And PERRLA doesn't run a similarity check, which Scribbr sells by the document. Your school may already run one on submissions, so it's worth asking before you pay.

A note on accuracy

Both tools fill in references from data on the web, and that data is sometimes thin: a missing volume number, an author's initials, a title in the wrong case. Scribbr's generator is built on the open-source Citation Style Language and citeproc-js, the same software behind Zotero and Mendeley, with Scribbr's own layer on top, and its help center asks you to double-check each reference against the source. PERRLA looks sources up in the published record (the DOI registry, PubMed, and book databases like Open Library) and formats them with rules people wrote from the manuals, but no lookup is better than its source. When you click I'm Finished, PERRLA also points out a reference you never cited and a reference title in the wrong capitalization. Whichever tool you use, give each reference a glance before you submit. The Purdue OWL says the same about using citation generators responsibly.

A note on AI

Scribbr offers several AI tools next to its citation generator, some free and some paid: an AI Proofreader that corrects your document with tracked changes, a paraphrasing tool powered by QuillBot and an AI Humanizer that reword text, a summarizer, and an AI Detector. Its Chrome extension also uses AI to pull key sentences from a page and write a summary of it. If your syllabus limits AI tools, ask your instructor where those fall. PERRLA never writes or rewrites a word of your paper and never invents a source. In the software, AI is used in one narrow spot: when you upload a PDF of an article, AI reads its first pages to help fill in the reference, and the details are checked against published databases. Your paper is never sent to it.

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Questions about PERRLA and Scribbr