HumanFlow vs StealthWriter

StealthWriter's free plan allows 10 humanizations a day, each up to 1,000 words. Used fully, that is 10,000 words a day. HumanFlow's free plan is 2,000 humanizer words a month.

There is no reading of those numbers that favours us on volume. A student with a heavy term's writing gets more done on StealthWriter's free tier than on our paid Writer plan, and the honest thing is to put that in the second paragraph rather than the twelfth.

Where the picture changes is the shape of a single document. Their free per-input cap is 1,000 words; ours is 1,500. A 1,400-word essay is one paste here and two there. Above 1,500 words, neither free plan handles the document whole and both of us are asking you to split it.

StealthWriter meters in humanizations per day. HumanFlow meters in words per month. The difference matters more than it first appears.

A daily count rewards steady work and punishes bursts. Ten rewrites is generous on a Tuesday and useless the night before a deadline when you have four documents to get through and have already used them. Unused days do not bank.

A monthly word budget does the opposite. You can spend the whole allowance in one sitting, and nothing expires until the month turns. Neither model is better in the abstract; they suit different working patterns, and it is worth knowing which one you are.

One more wrinkle: a 40-word rewrite and a 990-word rewrite both cost one humanization on StealthWriter. If you make lots of small fixes, that is expensive. If you always paste near the cap, it is very good value.

This is the only competitor on the site that shares our detection approach. StealthWriter's Deep Scan reports sentence by sentence, as ours does, and both return per-sentence reads rather than one document percentage.

They also give 10 free scans a day. Our free plan gives 10,000 detection words a month, with a 1,500-word cap per scan. For heavy checking, theirs is more generous again.

What neither of us can offer is a detector whose output means what people want it to mean. Detection scores are estimates produced by systems that disagree with each other on identical text, and peer-reviewed testing has put false positive rates above 60% for non-native English writers. HumanFlow does not promise to beat any detector — nobody honestly can — and we would say the same about any number StealthWriter published.

StealthWriter Starter is $20 a month, or $200 a year at $16.67 a month. HumanFlow Writer is $18 a month, or $129.60 a year at $10.80 a month. On annual billing we are around a third cheaper.

Their Starter allows 50 humanizations a day at up to 5,000 words each — a ceiling far above our 25,000 words a month. Priced per word of capacity, StealthWriter's paid plans are better value than ours, and by some distance.

So the pattern across this page is consistent: they give more capacity, we charge less to enter and hold the per-document edge at the free tier. If capacity is what you are buying, that points at them.

Try StealthWriter's free plan first. It costs nothing, it is more generous than ours, and if it fits how you work then the decision is made without anyone needing to read a comparison table.

Come back to HumanFlow if the daily counter gets in your way, if your documents sit in the 1,000-to-1,500 word band where our free scan takes them whole, or if you want the lower annual price once you are paying.

StealthWriter publishes no blog, no developer documentation and no public API. There is a product and a pricing page, and that is close to the whole site.

For one writer that matters very little. For a team it means no integration path — nothing to call from a script, no way to drop the tool into an existing editorial workflow. If that is where you are heading, HIX Bypass, Humbot and Undetectable.ai all publish APIs, and ours is in private beta with no public endpoint yet.

The absence has a second effect, and it runs in StealthWriter's favour more than you might expect. A vendor publishing nothing about detection accuracy is also a vendor making no claims you can catch them on, and their site promises nothing about beating Turnitin, GPTZero or any other named detector. Several tools in this category do promise exactly that, and not one of them can support it.

We take the opposite approach and publish the research, including the parts that undercut our own category. But on the specific question of overclaiming, StealthWriter's silence sits closer to our position than to the vendors advertising guarantees.

Pick StealthWriter if you want the most free capacity available anywhere in this category, or you want control over rewrite strength and per-sentence alternatives.

Pick HumanFlow if you want a lower entry price, you paste documents between 1,000 and 1,500 words, or you would rather hold a monthly word budget than a daily rewrite count.

One caveat that applies whichever you choose: HumanFlow is the newer product here. It runs in the browser and on Android, with an iPhone version in development, and the competitors on this page have had longer to accumulate integrations and export options. If you need a specific one of those today, that is a real reason to choose them.