Comparison

GPTZero vs SmoothKey

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

GPTZero

This tool helps determine if content is human-written or AI-generated. It offers detailed analysis, a plagiarism checker, and an AI humanizer to refine text. Ensure your content's originality and authenticity with advanced detection technology.

Highlights
  • AI content detection
  • In-depth analysis
  • AI humanizer
  • Plagiarism checker
  • Content scoring
Features
Read full description

GPTZero: AI Detector Humanizer is a powerful, easy-to-use tool designed to verify whether any content is created by a human or generated by AI. Using advanced technology, our app analyzes text, images, videos, and even music to detect patterns linked to artificial intelligence. Upload your content and instantly receive a clear AI percentage score. Our detection scale is simple and transparent: 0–30%: Likely Human – Content shows natural, organic patterns. 31–69%: Possible AI Signs – Mixed signals that may include both human and AI traits. 70–100%: Likely AI Generated – Strong indicators of AI tools or models. In-Depth Analysis & AI Humanizer Our In-Depth Analysis provides a detailed breakdown for every detection result. For each text, image, video, or audio upload, the app highlights the specific patterns and signals that influenced the AI score. You’ll see clear explanations and key indicators that show exactly why your content appears human, mixed, or AI-generated. You can also enhance your writing with our built-in Humanizer, which transforms robotic or AI-sounding text into natural language while preserving your original meaning and tone. Plagiarism Checker To ensure total authenticity, our Plagiarism Checker scans your text against billions of web pages, academic articles, and digital archives. It identifies overlapping content and unoriginal phrasing, helping you maintain professional integrity. Whether you are submitting an essay or publishing a blog post, you can be certain your work is both human-made and entirely unique. With its clean design, fast processing, and transparent results, GPTZero: AI Detector Humanizer offers a complete solution for anyone who values originality. Whether you are verifying content, improving your writing, or exploring digital creation, you can analyze and understand AI involvement with confidence. Privacy Policy: https://www.appzonedev.com/privacy-policy Terms of Use: https://www.appzonedev.com/terms-of-use Support: help@appzonedev.com

About

SmoothKey

Features
Read full description

SmoothKey is the AI reply keyboard that lives inside WhatsApp, iMessage, Instagram, Telegram and every app you already text in. Stuck on what to say? Copy their last message, tap Reply, and get three natural, ready-to-send replies in your chosen style - Playful, Thoughtful, Genuine, Flirty or Work. No app switching, no copy-paste gymnastics. AI replies come from our built-in engine - no setup, no configuration, nothing to plug in. Just install, add the keyboard, and go. - Works in every app - it's a real keyboard, not a chatbot - 5 reply styles - pick the vibe, get the words - Offline phrasebook - openers, work phrases, emoji packs and kaomoji - 100% private - zero tracking, zero analytics - Blazing fast - replies in seconds, right where you're typing SUBSCRIPTION: SmoothKey is free to download and includes a 1-day free trial of Pro. After the trial, SmoothKey Pro is $6.99/week, $19/month or $69/year (all auto-renewing). Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Stop staring at the screen. Start texting with confidence.

Screenshots

GPTZero4 screens
SmoothKey4 screens

Verdict

The call

The clearest difference is update cadence: SmoothKey at every 2 days against GPTZero's every 8 days. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. GPTZero sells 5 in-app purchases, starting at $7.99 per month and SmoothKey sells 3 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

GPTZero ships an update every 8 days, SmoothKey every 2 days. Both last shipped on October 31, 2026.

Scorecard1 real difference · 9 level
GPTZero versus SmoothKey: the parameters behind the verdict, then further details
ParameterGPTZeroSmoothKey
PriceFreeFree
Rating4.3 (135 ratings) — better—
Positive reviews70.4% of reviews—
Number of ratings135 — better—
Update frequencyEvery 8 daysEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.616.0 — better
Further details — not scored
Size25 MB4 MB
Age rating4+17+
DeveloperAppzone Dijital Hizmetler Anonim SirketiTehui Ruanzhuo (Weifang) Enterprise Management Consulting Co., Ltd.

In-app purchases

5 purchases

GPTZero

Subscriptions5
  • AI Detector Monthly Pro$7.991 Month
  • AI Detector Weekly Trial7 Days trial$9.997 Days
  • AI Detector Monthly Premier$14.991 Month
Show 2 more
  • AI Detector Yearly Pro$24.991 Year
  • AI Detector Yearly Premier$29.991 Year
3 purchases

SmoothKey

Subscriptions2
  • RizzKey Pro Weekly$6.997 Days
  • RizzKey Pro Annual$69.001 Year
One-time1
  • RizzKey Pro Lifetime$69.99

Questions

Is GPTZero free?
GPTZero is free to download, with in-app purchases available.
Is SmoothKey free?
SmoothKey is free to download, with in-app purchases available.
Do GPTZero or SmoothKey have ads?
Neither GPTZero nor SmoothKey shows ads.
Which is updated more often, GPTZero or SmoothKey?
GPTZero ships an update every 8 days, and SmoothKey every 2 days. Most recently, GPTZero was updated on October 31, 2026 and SmoothKey on October 31, 2026.

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