WriteHuman, a better alternative to StealthGPT

HumanizerBench is a public monthly benchmark of AI humanizers. It pays for every tool, runs each one by hand on the same prompts, and publishes its inputs, outputs, and detector scores so the results can be checked. The August 2026 cycle ran 396 tests across twelve humanizers and five AI detectors. WriteHuman finished first with a composite of 76.69. StealthGPT finished twelfth, last of the twelve, at 45.55 — a gap of 31.14 points.

The number underneath that spread is the AI-detector pass rate. StealthGPT was tested on its Essential plan and its output read as human-written on 27.5% of runs. WriteHuman was tested on its entry-level Basic plan and posted 89.1%. At 27.5%, fewer than three StealthGPT runs in ten came back clean, which is the practical version of the complaint third-party reviewers keep repeating: the tool reports a passage as human while outside detectors do not.

The benchmark breaks results down by what you are actually writing, and StealthGPT trailed WriteHuman on every category in the August 2026 cycle. Blog posts: 95.4% for WriteHuman against 49.4%. Marketing copy: 97.1% against 58.5%. News articles: 61.7% against 5.4%. Discussion posts: 99.9% against 3.0%. The last two are close to total failures — on discussion posts, 3 runs in 100 read as human-written.

WriteHuman also scored higher on the benchmark's consistency measure, 80.8% versus 75.2%, kept more of the original meaning intact, 71.7% versus 62.9%, and picked up fewer quality penalties, one point against StealthGPT's five. Taken together that is the difference between a tool you can paste anything into and a tool that needs you to guess which formats it happens to survive.

StealthGPT's marketing claims it produces output that scores well on every major AI detector, including Turnitin. Independent 2025 and 2026 reviews tell a different story. Long-form reviewers consistently report that StealthGPT output gets flagged by Turnitin and Originality.ai, even when the tool's own in-app checker reports the same passage as 'human.' AIDetectPlus called StealthGPT "by far the worst humanizer I tried," describing the output as gibberish you cannot actually submit.

There is also a recurring quality complaint in the same reviews: grammar slips, awkward phrasing, and the occasional incoherent sentence on longer drafts. Reviewers warn against trusting the built-in score in isolation.

WriteHuman's humanizer is tuned to preserve grammar and meaning on the first pass, and the built-in detector is tuned to closely match what external tools will report.

StealthGPT's pricing page shows every plan as a daily rate. Essential is $1.15/day. Pro is $1.00/day. Business is $3.35/day. Enterprise is $16.65/day. The numbers feel small because they are framed against a day, but there is no daily plan. You pay monthly. Multiply by 30 and the actual bill is $34.50, $30, $100.50, or $499.50 a month. Over a year, the cheapest StealthGPT plan costs $414 and you are still capped at 50 humanizations per day.

WriteHuman is displayed and billed the same way. Basic is $18 a month, or $216 a year. Pro is $27 a month. Ultra is $48 a month and unlimited. No daily-rate sleight of hand, no upsell to Enterprise just to escape a cap, and you can try the humanizer for free before paying anything.