Short answer
Walter Writes gives 30,000 words a month for $8 billed annually; Grubby AI gives 10,000 for $8.99, or 30,000 on its Pro plan for $9.99. Pick Walter for 80+ languages and a built-in detector; pick Grubby for an unlimited plan or its AutoTyper.
"Grubby AI vs Walter Writes" is the most searched head-to-head for Walter. Both are AI humanisers aimed at students, both offer Simple, Standard and Enhanced rewrite modes, and both start with a 300-word free allowance. The differences are in volume, language support and what comes in the box.
For Walter Writes on its own, see the Walter Writes guide; for the wider field, Walter Writes alternatives.
Walter Writes vs Grubby AI at a glance
| Field | Walter Writes | Grubby AI |
|---|---|---|
| Free option | 300 words, no sign-up; 3 days of detector access | 300 words a month after sign-up |
| Entry plan | $12 / month, or $8 / month billed annually ($96 a year) | Essential: $19.99 / month, or $8.99 / month billed annually ($107.88 a year) |
| Words on entry plan | 30,000 a month | 10,000 a month |
| Max per request | 750 (Starter) to 2,000 (Elite, Teams) | 500 (Essential) to 2,500 (Unlimited) |
| Languages | 80+ | English only |
| AI detector | Built in on every plan; scans do not use words | Not listed on its pricing page |
| Apps | Web, Chrome extension, iOS, Android, Claude (MCP) | Web; AutoTyper on paid plans |
| Refunds | First subscription only, within 3 days and 1,500 words | See Grubby terms |
| Security report | SOC 2 Type II (report on request via its trust centre) | No SOC 2 report published on its site |
Every cell comes from each vendor's own pricing or product page, read in November 2026. Prices are in US dollars and change often; the vendor page wins if a figure has moved.
Where Grubby AI is stronger
- Unlimited plan. Grubby sells an Unlimited plan at $12.99 a month billed annually, subject to a 30,000-word daily fair-use limit. Walter has no unlimited plan; its largest individual plan is Elite at 200,000 words a month.
- Longer inputs at the top. Grubby allows up to 2,500 words per input on Unlimited, against 2,000 on Walter’s Elite.
- AutoTyper. Grubby bundles an AutoTyper on paid plans; Walter has no equivalent.
Where Walter Writes is stronger
- More words for less at entry level. Walter Starter gives 30,000 words a month for $8 billed annually; Grubby Essential gives 10,000 for $8.99.
- Languages. Walter lists 80+ languages; Grubby says it humanises English only.
- Built-in detector. Walter includes an AI detector on every plan and scans do not use your words.
- Apps. Walter runs on web, Chrome, iOS, Android and inside Claude.
- All rewrite modes from the first paid plan. Grubby Essential offers Simple mode only; Standard and Enhanced start on Pro.
About Grubby’s "Turnitin guarantee"
Grubby’s pricing page says it is the only humaniser that guarantees its text bypasses Turnitin’s AI detector. That is the vendor’s own claim; we found no independent test of it, and it does not say what the guarantee covers if a check fails. Walter makes no such guarantee and says rewriting does not guarantee any detector score. Read both as marketing, and read the terms before relying on any guarantee.
Walter Writes or Grubby AI: which should you choose?
- Choose Walter Writes if you write in a language other than English, want a detector in the same app, or need 30,000 words a month at the lowest entry price.
- Choose Grubby AI if you need very high daily volume on one flat price, or want the AutoTyper.
How to test Walter Writes and Grubby AI side by side
Ten minutes of your own testing beats any review, including this one. Use the free allowance on each tool and keep the inputs identical:
- Pick one real paragraph from your own work, about 200 to 250 words, so it fits both free limits.
- Run it through both tools on comparable settings, for example Standard on Walter and the closest mode on Grubby AI.
- Check meaning first. Read both outputs against the original: every claim, number, quotation and citation should survive.
- Check voice second. Which version still sounds like you, or like the assignment needs?
- Check detection last, in a detector neither company sells, from our list of free AI detectors. Record the date, because results change as detectors are retrained.
Whichever output needs less fixing by hand is the better tool for you, whatever either vendor claims.
What neither tool can promise
Whatever either vendor says about detectors, results depend on the text, the settings, the detector and the date. Turnitin announced detection of humaniser-modified text on August 27, 2025, and a 2025 audit of 19 humaniser and paraphrasing tools found large differences in how far each tool moved text from the original. Pick on workflow, price and how well the output keeps your meaning, then edit the result yourself. Our page on Walter Writes and Turnitin covers the evidence.
How we compared
We read the pricing and product pages of both tools and Walter's humaniser page and help centre in November 2026 and recorded the same fields for each. We ran no detector test for this page, so neither tool gets a score from us. Related: Walter Writes pricing and Walter Writes reviews.
Frequently asked questions
Grubby AI vs Walter Writes: which is better?
Walter Writes suits writers who want 80+ languages, a built-in detector and 30,000 words a month from $8 billed annually. Grubby AI suits English-only users who want an unlimited plan or its AutoTyper. Neither can guarantee a detector score.
Is Grubby AI cheaper than Walter Writes?
Not per word at entry level. Walter Starter is $8 a month billed annually for 30,000 words; Grubby Essential is $8.99 for 10,000 words. Grubby Pro gives 30,000 words for $9.99 billed annually.
Does Grubby AI work in other languages?
No. Grubby says it humanises English only. Walter Writes lists more than 80 languages.
Does Grubby AI really guarantee Turnitin?
Grubby's pricing page claims a Turnitin guarantee. We found no independent test of that claim. Turnitin added detection of humaniser-modified text in August 2025.
