Grubby AI vs Walter Writes AI: Which Humanizer Should You Pick?

Key takeaways

• At 30,000 words a month, Walter costs USD 96 a year and Grubby USD 119.88.
• Above 70,000 words a month, Grubby’s USD 155.88 Unlimited plan is the cheaper route.
• Grubby renews 300 free words a month; Walter’s 300 free words are one time, plus 3 days of detector access.
• Walter rates 3.4 from 75 reviews on Trustpilot; Grubby rates 3.0 from 65.
• Grubby advertises a Turnitin bypass guarantee; Walter’s terms say it does “not guarantee” output will always avoid detection.

How did I compare Grubby AI and Walter Writes AI? (method)

I gave both tools the same fields and filled each one only from a dated public source: the vendor’s pricing page, its terms or help center, a store listing, Trustpilot, or a named outside test. Where a vendor publishes nothing on a field, the table says so instead of guessing.

One honest gap: the guide’s 50-input test covers Walter but not Grubby, so I don’t print a Grubby pass rate of my own. The only outside test of both comes from GPTZero, which sells a detector, and I show it below with that caveat.

Is Walter Writes AI better than Grubby AI?

Yes, for most people, because Walter wins three of the five criteria buyers ask about. Here is who wins each, and why:

• Price at normal volume: Walter. USD 96 a year buys 30,000 words a month on Starter; Grubby charges USD 119.88 for the same 30,000 on Pro.
• Price at heavy volume: Grubby. Its Unlimited plan is USD 155.88 a year, while Walter’s largest single-user plan, Elite, is USD 312 for 200,000 words.
• Checking your text: Walter. Every Walter plan includes its own detector, and scans use no word credits, per Walter’s troubleshooting FAQs. Read the Walter Writes AI detector review for how it scores.
• Languages: Walter. Walter lists 80+ languages on every plan; Grubby’s homepage says “more than 30.”
• Free use: Grubby. Its 300 free words renew every month; Walter’s do not.

How much do Grubby AI and Walter Writes AI cost over 12 months?

Walter is cheaper up to 30,000 words a month, the two tie at about 70,000, and Grubby is cheaper above that. Both vendors show yearly billing as a monthly figure, so the annual charge is the number to compare.

Both plans renew automatically. Walter’s monthly-billed prices are higher (Starter USD 12, Pro 23, Elite 47 in the App Store), and Grubby’s cards show crossed-out prices of USD 19.99, 24.99, 29.99 and 200.

Matched to how much you write, the yearly bill looks like this:

Walter’s own grid shows four plans with the same yearly prices. Discount codes change often, so check current Walter discount codes and Walter Writes AI pricing and word limits before paying.

Which is better for free: Grubby AI or Walter Writes AI?

Grubby gives more free words over time; Walter gives a fuller free test. Grubby’s pricing page says “300 words free per month.” Walter’s trial article gives “300 Humanizer words, plus full access to the AI Detector for 3 days,” with no card, but only on the Simple level, and the trial does not renew. Our Walter Writes AI free trial guide shows how to use it.

Does Grubby’s Turnitin guarantee make it safer than Walter?

No. A guarantee is a refund promise, not a detection result. Grubby’s banner reads “100% Turnitin Bypass Guarantee” with “your money back,” and each plan card says “Guaranteed to bypass Turnitin AI detector.” Walter’s Terms of Service take the opposite line: Walter does “not guarantee” output “will always avoid detection,” and “firmly” opposes academic dishonesty.

Turnitin is sold to institutions, so individuals can rarely check it themselves; GPTZero’s Grubby review skipped Turnitin for that reason. No AI humanizer guarantees a pass; results vary by detector and by date. My test data on Walter is in how Walter Writes AI performs against Turnitin, where it passed 99% of Turnitin checks across 50 inputs.

How did Grubby AI and Walter Writes AI do in outside detector tests?

The only publisher that tested both is GPTZero, a detector company, with one short ChatGPT sample per tool. Both tools were caught by GPTZero and Copyleaks:

Read this as a sales page with data, not a benchmark: one sample each, and GPTZero’s Walter review used the free Lite mode, which it says “barely replaced a few words.” In the guide’s larger test on the paid levels, Walter’s output passed GPTZero 99% of the time; see the best AI humanizer ranking.

Which has more features: detector, apps or languages?

Walter covers more surfaces; Grubby adds an AutoTyper. Walter’s Chrome extension holds 4.8 out of 5 from 103 ratings, its iPhone app 4.6 from 23, and it has an Android app, a humanizer API from USD 49 a month and MCP for Claude and Codex; see the Walter Writes AI app for iPhone and Android.

Grubby’s plans include an AutoTyper of 5,000 to unlimited words a month, and its founder lists a humanizer “with 3 different modes,” a Chrome extension, a mobile app and study tools in a Trustpilot reply.

How do Grubby AI and Walter Writes AI compare on Trustpilot?

Walter rates higher and answers faster. Walter’s profile shows 3.4 from 75 reviews, replies to 71% of negative reviews and a typical reply “within 24 hours.” Grubby’s profile shows 3.0 from 65, replies to 46% and “over 1 month” to reply. Both were checked November 9, 2026.

Refunds drive many 1-star reviews on both. Walter refunds a first-ever subscription within 3 days if you used 1,500 words or fewer, and “all subscription renewals are final”; see Walter refund policy explained. A Grubby reviewer on November 4, 2026 reports a refused refund on an annual Pro renewal of USD 106.50 cancelled the next day. The full picture on Walter is in is Walter Writes AI legit.

Who should choose Walter Writes AI, and who should choose Grubby AI?

• If you write up to 30,000 words a month, choose Walter Writes AI, because Starter costs USD 96 a year against USD 119.88 for Grubby Pro.
• If you want to check every draft, choose Walter, because its detector is included and scans use no words.
• If you write in more than one language, choose Walter, because it lists 80+ against Grubby’s 30+.
• If you rewrite more than 70,000 words a month alone, choose Grubby AI, because Unlimited costs USD 155.88 a year.
• If you only need a few hundred words now and then, choose Grubby, because its 300 free words renew monthly.

Students should check their school’s rules first; our guide on whether using an AI humanizer is cheating covers that. For everything else Walter does, see our complete Walter Writes AI guide.

Keep reading

• Full Walter Writes AI review
• What Reddit says about Walter Writes AI
• Walter Writes AI alternatives
• Walter vs Undetectable AI
• Cancel a Walter subscription

Frequently asked questions

Try Walter Writes AI free with 300 Humanizer words and 3 days of detector access, then compare it with Grubby on the same draft.