Walter Writes AI vs Undetectable AI

Both vendors sell upward from the entry plan, and the ladders differ in what the next step buys. Walter Writes AI lists Starter, Pro, Elite and Teams at 30,000, 70,000, 200,000 and 500,000 words a month, billed $96, $156, $312 and $1,188 a year, with request caps of 750, 1,500, 2,000 and 2,000 words, read on its homepage pricing block on 9 November 2026. Undetectable AI prices by a word slider with the yearly toggle on by default, and the 10,000-word tier is the lowest point, read 9 November 2026.

Neither trial converts into a charge on its own, which puts both ahead of the paid trials some rivals sell. The difference above the entry tier is that Walter's ladder raises the request cap as it raises the pool, while Undetectable AI's cap is unstated throughout.

The two entry plans are built differently, so the table shows the arithmetic rather than a verdict. Price is reported on this site and never scored.

Walter Writes AI figures read on its homepage pricing block on 9 November 2026; Undetectable AI figures read on its pricing page on 9 November 2026. Two caveats attach. Walter's monthly toggle prices were not in the page as read, so a monthly-to-monthly comparison cannot be made here. And a lower price per word only matters if you use the words: a writer who needs 8,000 words a month pays $60.00 a year on Undetectable AI and $96 on Walter Writes AI for a pool that mostly goes unused.

Undetectable AI states no per-request cap, so an essay or article goes in whole, read 9 November 2026. Walter Writes AI's Starter plan caps a request at 750 words, which means a 1,500-word essay is two pastes and a 3,000-word article is four; Pro raises the cap to 1,500 words and Elite to 2,000, read 9 November 2026. Splitting a document is more than an inconvenience for a rewrite tool, because each piece is rewritten without the context of the others, and transitions across the join have to be checked by hand.

The monthly pools run the other way. Starter's 30,000 words is about twenty 1,500-word essays; Undetectable AI's 10,000 is about six. A person with a few long documents a month fits Undetectable AI's shape; a person with many short ones fits Walter's.

Walter Writes AI names three modes, Simple, Standard and Enhanced, described by the vendor as rewrite strengths from subtle to advanced, read 9 November 2026. Undetectable AI names no modes on its pricing page. For a reader who wants the smallest rewrite that still changes how the text reads, a named light mode is the only control a vendor page offers, and only one of these two offers it.

The published method runs each tool on its default setting and on its strongest documented mode where one exists. For Walter Writes AI that means two rows, and the run records which mode was the default on the run date. For Undetectable AI the run uses whatever the interface shows and records the name in the raw files.

No peer-reviewed study has tested either product by name in a way this site could cite, so the research here is about the category. Krishna and colleagues reported that a paraphraser dropped DetectGPT's detection rate from 70.3 percent to 4.6 percent at a 1 percent false positive rate (Krishna et al. 2023, arXiv 2303.13408, read 9 November 2026). Weber-Wulff and colleagues tested 14 detectors and concluded they were neither accurate nor reliable, with obfuscation such as paraphrasing worsening performance (Weber-Wulff et al. 2023, International Journal for Educational Integrity, read 9 November 2026).

Those studies measured detector readings, not whether the rewritten text kept the writer's claims. The method on this site weights meaning kept at 35 points of 100, errors introduced at 20, detector pass rate at 30 and limits and access at 15, and two editors rate every output blind. When a run is published, this page gains meaning, error and per-detector fields for both tools. No detector score should be the only evidence in a misconduct case.