AI Detector AI Humanizer ChatGPT Detector AI Content Detector AI Humanizer Detector Accuracy Private Detector How it works Tools

Comparison

A Private, Unlimited Originality.ai Alternative

For writers and editors who want a no-cost, private check.

Related: GPTZero Alternative · Turnitin Alternative
Try it on a known sample — we already know what each one is:
Paste your text here to analyze it. Use at least 40 words for a reliable read.
Likely human Mixed Possibly AI Likely AI

Probability, not a verdict. Colors show per-sentence signals, not accusations.

Words: 0/5000

By using our detector, you agree to our Terms.

0%
of text is likely AI
Human vs AI, across the passage
Human written AI generated
Awaiting text
Paste a passage to begin
Your result and the reasoning behind it will appear here after you run a scan.
AI-generated0%
Human-written0%
AI-refined0%

Astra AI Detector shows probability, not proof — no AI checker is 100% accurate.

0%
0%
01The suite

What Originality.ai is built for

A serious commercial platform for publishers, agencies and SEO teams — bulk scanning, plagiarism and API included.

Originality.ai targets publishers, agencies and SEO teams, bundling AI detection with a plagiarism checker, a Chrome/Google Docs extension and an API, on paid plans.

In the independent RAID benchmark it ranked among the strongest detectors, including on paraphrased text. If you need bulk scanning, an API or team workflows, it's a serious commercial tool.

Bundles AI detectionPlagiarism checkerChrome / Docs extensionAPITeam workflows
02The difference

How Astra is different

Free, private and in-browser — with honest trade-offs where a paid suite still wins.

Astra is free and runs entirely in your browser, so drafts and client copy are never uploaded or stored — a real consideration when checking work under NDA.

It gives an AI score with sentence-level highlights and flags AI-refined (paraphrased or rewritten) text, with no account or subscription.

Trade-offs to be honest about: Astra doesn't include a plagiarism checker, a bulk API or team dashboards — if those are core to your workflow, a paid platform may fit better.

03Which to pick

Which should you choose?

Per-piece and private points to Astra; API, plagiarism bundling and volume point to a paid platform.

Choose Astra when you want a fast, private, no-cost check for individual pieces — verifying a freelancer's draft or your own article before publishing.

Choose a paid platform when you need API access, plagiarism bundling or high-volume scanning.

See the content detector guide for editorial workflows and the accuracy page for how we think about evidence.

04Side by side

Originality.ai vs Astra: a side-by-side comparison

Where each tool wins, without the marketing spin.

FeatureAstraOriginality.ai
PriceFree, unlimitedPaid (credit-based)
Account / sign-upNoneRequired
Where your text goesStays in your browser, nothing uploadedUploaded to its servers
Sentence-level highlightsYesYes
Extra suite (plagiarism, team, API)Focused detector, plus separate free toolsYes, full publisher/SEO suite
Best forPrivate, free individual checksAgencies & publishers needing a paid suite

Both tools give an AI-likelihood score and highlight the passages driving it. They differ most in cost, privacy and scope. Here is the honest split:

Price

Originality.ai is paid — you buy credits (roughly $0.01 per 100 words at the time of writing), after a small one-time trial. Astra is free, with no credits, word caps or subscription.

Privacy

Originality.ai is a server tool, so your text is uploaded to be analysed. Astra runs entirely in your browser, so drafts and client copy never leave your device — which matters for work under NDA.

Sign-up

Originality.ai needs an account and payment details. Astra needs neither; you paste and go.

Plagiarism and sources

Originality.ai bundles a plagiarism checker that matches text against the web. Astra is an AI detector only.

API and bulk

Originality.ai offers an API, team seats and dashboards for scanning at volume. Astra is a single-page tool for one piece at a time.

Integrations

Originality.ai has Chrome and Google Docs extensions; Astra works on any page you open in a browser, with nothing to install.

Neither is strictly better. Originality.ai is built for agencies scanning at scale and needing plagiarism plus audit trails. Astra is built for a fast, private, no-cost read on an individual piece of writing.

05The cost

What Originality.ai costs, and when a free check is enough

The credit model explained, so you can decide whether you even need to pay.

Originality.ai has no ongoing free plan.

New users get a small credit allotment to trial it, then pay per scan. At the time of writing, credits work out to about $0.01 per 100 words — so a 1,500-word article costs roughly fifteen cents, and a month of heavy scanning adds up. Its pricing changes, so always check the current rates.

That model is efficient if you scan constantly, or need plagiarism matching and API access bundled in. But many people open Originality.ai for a single question: does this read as AI? For that alone, paying per word is overkill.

A free, browser-based check answers the same question without a credit balance to watch:

Approve an invoiceVerifying one freelancer's draft before you approve the invoice.
Before you publishChecking your own article before you publish it.
Spot-check a paragraphSpot-checking a paragraph a colleague forwarded you.
Train your eyeLearning what AI-ish writing actually looks like, sentence by sentence.

If your work is occasional and per-piece, a free alternative covers it comfortably. If you scan hundreds of URLs a week, or need plagiarism reports and shared dashboards, paid credits earn their keep. Match the tool to your volume, not to the marketing.

06Migrate

How to switch from Originality.ai to Astra

Move a single-piece check across in about a minute — no export, migration or account to close.

Moving a single-piece check across takes about a minute — there is no export, migration or account to close:

Open the detector

in any browser. Nothing installs, and nothing uploads to a server.

Paste the text

you would have dropped into Originality.ai. Aim for at least 40 words so the signals are stable; very short snippets are unreliable in any detector.

Run the scan

and read the overall AI-likelihood score alongside the human-versus-AI bar.

Read the sentence highlights

to see which lines look machine-written, and note anything marked AI-refined — paraphrased or lightly rewritten text.

Treat it as one signal

A score is not proof of authorship; weigh it with context, and when it matters, talk to the writer.

Two capabilities stay with a paid tool for now: plagiarism matching against the web, and bulk or API scanning across many pages. A practical setup is to use a free in-browser check for day-to-day, private, per-piece reads, and keep a paid plan only if plagiarism or high-volume automation is genuinely part of your job. Some writers find that once their paid credits are only doing plagiarism, a dedicated plagiarism tool works out cheaper than an all-in-one.

07Questions

Originality.ai alternative FAQ

Free plans, pricing, privacy and how the two tools work together.

Does Originality.ai have a free plan?

No. It gives new users a small one-time credit trial, then charges per scan; there is no ongoing free tier. Astra, by contrast, is free to use in your browser with no credits or account.

How much does it cost to check an article on Originality.ai?

Pricing is credit-based — roughly one cent per 100 words at the time of writing, so a 1,500-word post is about fifteen cents. Check its current rates, and remember a free browser tool costs nothing per scan.

Why do writers look for an Originality.ai alternative?

The usual reasons are cost (it is paid and credit-metered) and privacy (text is uploaded to its servers). A free, in-browser tool addresses both directly, without an account or a credit balance to manage.

Can I use Astra alongside Originality.ai?

Yes — they are complementary. Many people use a free in-browser check for quick, private, per-piece reads and keep a paid tool only for plagiarism matching or bulk API scanning.

Is there a free alternative to Originality.ai?

Yes — Astra is a free AI detector that runs in your browser with no account or word limit.

Does Astra have an API?

Not yet — Astra is a browser tool. If a bulk API is essential to your workflow, a paid platform may fit better for now.

Does Astra check plagiarism?

No — Astra is an AI detector only. See AI detector vs plagiarism checker.

Is Astra good for publishers and SEO teams?

Yes for fast, private per-piece checks — see the content detector guide. For high-volume scanning, a paid API-based tool may suit better.

Does Originality.ai store my content?

It's a server-side tool, so content is uploaded for analysis — check its current policy. Astra never uploads your text.

How accurate is each?

Independent benchmarks rate Originality.ai strongly; every tool varies by test. See our accuracy page — we don't claim to be the most accurate.

AI-generated
H
High Confidence