QuillBot vs Harpa vs WriteHuman vs Undetectable AI

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
QuillBot
vs
Competitor 1
Harpa
Competitor 2
WriteHuman
Competitor 3
Undetectable AI
Compare
4 tools · best value per row highlighted
Your tool QuillBot
quillbot.com
Rephrase until it sounds right
Remove
Competitor Harpa
harpa.ai
HARPA AI is a Chrome Extension and NoCode RPA platform that automates web tasks to save time and money. It uses a hybrid AI engine built on ChatGPT and Machine Learning to perform tasks such as provid
Make main Remove
Competitor WriteHuman
writehuman.ai
WriteHuman is an AI humanizer that rewrites machine-generated drafts so they read like a person wrote them.
Make main Remove
Competitor Undetectable AI
undetectable.ai
Undetectable AI bundles an AI text detector, an AI humanizer and an AI image detector into one account.
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
31.4Mvisits/mo
281.1Kvisits/mo
—
—
MoM change
▼ 8.4%
▼ 18.4%
—
—
6-month growth
-27.9%
-55.5%
—
—
Global rank web
#1,318
#170,120
—
—
Avg. last 3 months
36.7M
326.3K
—
—
Bounce rate lower is better
46%
53%
—
—
Pages / visit
5.5
1.6
—
—
Visit duration
2m 52s
1m 09s
—
—
Traffic sources
● Direct 76% · ● Referral 22%
● Direct 95% · ● Referral 4%
—
—
QuillBotHarpaWriteHumanUndetectable AI
014.9M29.9M44.8M59.8MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4MHarpa · 269.4KHarpa · 340KHarpa · 397.4KHarpa · 367.5KHarpa · 631.4KHarpa · 457.2KHarpa · 421.2KHarpa · 353.4KHarpa · 344.4KHarpa · 281.1K100K1M10M100MQuillBot · 59.8MQuillBot · 47MQuillBot · 42.9MQuillBot · 43.5MQuillBot · 49.6MQuillBot · 48.1MQuillBot · 44.6MQuillBot · 34.3MQuillBot · 31.4MHarpa · 269.4KHarpa · 340KHarpa · 397.4KHarpa · 367.5KHarpa · 631.4KHarpa · 457.2KHarpa · 421.2KHarpa · 353.4KHarpa · 344.4KHarpa · 281.1KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
Freemium
Paid
Starting price
$19.95per month · free tier available
€14.3per month
$12per month · free tier available
$5per month
Free tier
–
–
Free trial
–
–
–
API access
–
–
Plans
—
Everyone €14.30/moPro €19.60/moLife €238
Free FreeBasic $12/moPro $19/moUltra $39/mo
10K words $5/mo20K words $9.50/mo35K words $15.75/mo50K words $21.25/mo+1 more
Capabilities input → output
Input
ImagesTextDocuments
Web pagesText
Text
TextImagesDocuments
Output
TextSlidesImagesDocuments
TextData
Text
TextData
Skill level
Beginner-friendly
Intermediate
Beginner-friendly
Beginner-friendly
Categories
AI Detection & SafetyWriting & ContentAI DetectorAI Grammar Checker+5 more
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeVideo Editing+7 more
AI Detection & SafetyAI DetectorHumanizer AI
AI Detection & SafetyAI DetectorAI Image DetectorHumanizer AI
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
9
10
7
10
Detection
–
Undetectable content writing
–
Text humanization
–
–
Content detection
–
–
AI authorship detection
–
–
Humanizing AI text
–
–
Summarizing
–
–
Agents
–
–
–
Chrome extensions
–
–
–
Paraphrasing
–
–
–
Email automation
–
–
–
Grammar checking
–
–
–
Image authenticity analysis
–
–
–
Plagiarism detection
–
–
–
Video summaries
–
–
–
Web scraping
–
–
–
Writing
–
–
–
Audio detection
–
–
–
Bypassing AI content detection
–
–
–
Chatbots
–
–
–
Document summarization
–
–
–
Edited image detection
–
–
–
Email management
–
–
–
Proofreading
–
–
–
SEO
–
–
–
Text enhancement
–
–
–
Web browsing
–
–
–
Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 2
▲ 1
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
–
–
–
–

Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.