Undetectable AI free vs Walter Writes free

Nothing, in practice. The difference between the two trials is 50 words, about two sentences. Both pools accept a single short paragraph from a chatbot, which is enough to see how far the tool rewrites, whether it changes sentence order, and whether the output reads like the input's register or a flatter one. Neither pool is enough to run a 500-word essay section, which is the shortest input genre in the published method.

The one real difference is what the trial lets you vary. Walter Writes AI names three modes on its pricing block, Simple, Standard and Enhanced, so a 300-word trial can be split into three 100-word pastes, one per mode, to see how the rewrite strength changes the text. Undetectable AI names no modes on its pricing page, so its 250 words test one setting. A trial that shows the mode ladder tells you more about what the paid plan will do than a trial that shows one output.

A trial is a doorway to a plan, so the plan behind each matters as much as the trial. Undetectable AI's pricing page shows its lowest tier at $5.00 a month for 10,000 words with the yearly toggle on by default, charged $60.00 at once, or $9.99 on monthly billing, read 9 November 2026. Walter Writes AI's Starter plan is 30,000 words a month at $8 a month billed $96 yearly, with each request capped at 750 words, checked on 8 November 2026.

The two plans are shaped for different writers. A 10,000-word pool with no stated request cap suits someone with a few long documents a month. A 30,000-word pool with a 750-word cap suits someone with many short texts. The trials do not reveal this: a 250 or 300 word paste fits inside every cap, so the request cap only shows up after you pay. Price is reported on this site and never scored.

One more difference sits in the billing. Undetectable AI's page opens on the yearly toggle, so the $5.00 figure a visitor sees first is the yearly rate and the monthly rate is $9.99. Walter Writes AI's block shows the yearly-billed rate with the yearly total beside it. Neither trial converts into a charge on its own.

Two peer-reviewed findings set the limits of any short trial. Krishna and colleagues reported that a paraphraser cut 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 found all of them below 80 percent accuracy, with paraphrased text lowering accuracy further (Weber-Wulff et al. 2023, International Journal for Educational Integrity, read 9 November 2026).

Both studies measured detectors, and neither measured whether the rewritten text still said what the writer meant. A trial paste checked against a free detector tells you one reading on one date for one paragraph. It does not tell you whether a qualifier was dropped or a technical term swapped, which is what the method on this site has two editors rate blind, across 24 inputs, before any detector reading counts. No detector score should be the only evidence in a misconduct case.