First, the honest version
There's a decent chance you landed here because TextGuard's ad showed up when you searched for us. Fair enough — that's how a lot of these tools find customers now. So instead of a hit piece, here's a straight comparison: what each tool is genuinely good at, and where it falls short.
TextGuard.ai is an all-in-one. In a single subscription you get an AI detector, a plagiarism checker, a citation generator, a summarizer, and a humanizer. If what you want is one tab that covers the whole “is this going to get me in trouble” checklist before you submit an assignment, that breadth is real, and it's the strongest thing TextGuard has going for it. SupWriter doesn't do plagiarism checking or citations — we deliberately don't try to be five tools at once.
But most people choosing between these two aren't really comparing bundles. They want one specific outcome: take AI-written text and turn it into something that reads like a person wrote it and doesn't get flagged. On that single job, the picture gets less flattering for TextGuard.
The humanizer: what independent testing found
We didn't want to rely on our own word here, so we looked for third-party testing. In a review published by TwainGPT, text run through TextGuard's humanizer was still flagged as AI by every major detector they tried — Turnitin, GPTZero, Originality.ai and Copyleaks among them. To be fair to TextGuard, they don't loudly advertise “beat Turnitin” the way some tools do, so this is more a gap than a broken promise. But if you're paying a humanizer to get you past a detector and it doesn't, the marketing distinction won't help you much.
The built-in detector draws similar complaints. On Trustpilot, multiple users report it hands back inconsistent scores — flagging clearly human writing as AI in one run, then missing obvious AI text in another. A detector that disagrees with itself is hard to make decisions with.
SupWriter goes the other direction: we do one thing. The humanizer rebuilds your text with the kind of natural variation — uneven sentence lengths, less predictable word choices, real rhythm — that detectors key off of, while keeping your meaning intact. That focus is why we hold a 99%+ bypass rate across Turnitin, GPTZero, Originality.ai and the rest, and why there's a built-in detector you can check against before you submit.
Trying it, and paying for it
This is the part that comes up most in reviews: TextGuard has no free trial. It's $15/month on the web, and you pay before you can see what the output actually looks like on your own text. The mobile app lists higher tiers still. A few reviewers also mention word limits that aren't spelled out upfront and overage charges that caught them off guard.
SupWriter starts at $9.99/month, and you can start with 300 words free — no card required. Run your own paragraph through it, check it against the built-in detector, and decide from there. You can also buy extra credits when you need them instead of guessing at a hidden cap. For most people weighing these two, “try it on my actual text first” settles the question quickly.
So which should you pick?
Pick TextGuard.ai ifyou specifically want a plagiarism checker and citation generator living in the same tool as your humanizer, and you're comfortable paying $15/month upfront to get the bundle. The convenience is genuine.
Pick SupWriter if the actual job is humanization — AI drafts that need to read naturally and pass detection for a class, a client, or a publication. You get a focused engine with a 99%+ bypass rate, an advanced editor, Writing DNA to match your own voice, 110+ languages, and a free way to test all of it before you spend a cent. If you're shopping around, the TextGuard.ai alternative breakdown goes deeper on the switch.
Related reading
- Best TextGuard.ai Alternative — why people switch, in detail
- How to Pass Turnitin's AI Detection
- Best AI Humanizer Tools (2026) — the full ranked list