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Run the first scan
My sites
Full PRO is free for 7 days after registration. After the trial, activate Monthly, Yearly, or Lifetime PRO manually by email or Telegram.
0sites added
Results, progress, and discovered pages are stored separately for each domain.
Add your first siteAfter adding it, run a baseline scan. BYDIFF will save the initial state for future comparisons.
Monitoring Command Center
At a glance: everything is calm or the site needs attention
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Scanner Agent status
0
pages checked
0
Critical + High
Latest state
Facts from the latest scan and comparison
Scan errors
Scan errors are separate from site changes
Activity
Latest saved scans
Privacy Center
Where BYDIFF data is physically stored
LOCALHTML · DOM · screenshots · English · credentials
CLOUDEnglish · English · English · English · English
Collecting the latest scan data…Connecting to Scanner Agent and checking saved results.
STATUS English
WAITING FOR DATAOverview English
Home English, changes English
English Scanner Agent…English.
Needs attention
Appears after comparing two successful scans
0
0 URL discovered on the site
VALID HTML
0
Available for comparison
NOT CHECKED
0
Network, protection, and non-HTML
ERRORS
0
HTTP and network errors
Site monitoring
Scan and saved-state history
0Total scans
0Saved versions
—First scan
—Last saved version
—Average duration
0Changes / scan
0Errors / scan
+
First discovered0 URL
−
Removed pages0 URL
Site-level changes
robots.txt and Sitemap are not tied to a single page
Latest changes
Most important first
No comparison data yetThe first successful scan creates a baseline. Changes will appear here after the next scan.
Scan status
Scan starts manually
0pages
- Processed
- 0 of 0
- Result
- No data
- Load profile
- Gentle
- Duration
- —
- URL discovery
- —
- Filtered
- —
- Network retries
- —
- Error reasons
- —
- Safety limits
- Not reached
Last scan summary
Summary appears after the scan finishes
0Critical
0Important
0Information
—Archive
Scan reliability
Coverage, errors, and targeted recheck
0%coverage of discovered URLs
0Checked
0Could not check
0Remaining beyond limit
Site health signalsAppear after comparing two scans
NO DATAProblem URLs and reasons will appear here after scanning.
Collecting page changes…Waiting for confirmed data from the latest comparison.
Changes
Changes appear after two successful scans
PAGECHANGE TYPEBEFORE → AFTERTIME
Compare
Select a changed page
English A ↔ B — English
Page historyWhen the selected URL changed
…
English
English.
Content English.
Loading pages from the latest scan…Until the data is confirmed, BYDIFF does not show misleading zero values.
Site pages
The list appears after scanning
PAGESTATUSSOURCECHECKEDEnglish
Home page/5 changesSitemapToday, 14:32
New promotion case/cases/ai-searchNew pageCrawlerToday, 14:31
Contacts/contactsUnchangedSitemapAug 12, 10:15
Loading scan history…Loading saved versions from Scanner Agent.
Scan history
Saved states and site changes
Backup history
Recent saved versions · bar height = meaningful changes
History appears after the first successful scan.
Exclusions
Rules for dynamic blocks and unwanted pages
i
Why use exclusions? Dates, counters, ads, and online chats change automatically. Exclude them to receive notifications only about important changes.
Ready-made examplesClick an example to prefill the form. Check the selector or mask before saving.
Loading rules…
English
English BYDIFF
English
English
English
English 8 English
English
English
History English
English
Server
Monitoring settings
Customize BYDIFF safely. Critical reliability parameters are protected and managed automatically.
✓
Safe configurationResetting does not remove the folder, sites, history, Pro access, or exclusions. Timeouts, checkpoints, 429/503 protection, and the internal queue cannot be edited manually.
GeneralInterface, storage, scan mode, and history
▤Checking…
Local storage
Site snapshots are stored in the selected folder on your computer
BYDIFF folderChecking local folder access.Size: —
—HTML—CSS—JS—Images—Fonts—Versions
Storage structure
BYDIFFsitessite domainversionsimagessnapshot.json
↻
Scanning
English BYDIFF PRO
PRO7 days English manual activation via email or Telegram · EnglishPRO
Automatic: timeouts, 429/503 retries, checkpoints, queue size, and adaptive throttling. These parameters are protected to keep the scanner stable.
◷
Version history
English
PRO · English7 / 30 / 60 / 90 / 180 / 365 days English. English.SELECTABLE
Pinned versions ★In Pro, pinned checkpoints are not removed by automatic time-based cleanup.KEPT
AutomationBackground scanning, site schedules, and notifications
◷
Automatic scanning
Background checking of added sites while Chrome is open
Automatic scanning runs only while Chrome is open, does not wake the computer, and never scans two sites at the same time. The local folder must remain accessible to save visual history.
◫
Site schedules
Individual frequency and mode for each site
Loading sites…
If no individual frequency is set, the general schedule above is used. A disabled site is excluded from the background queue.
♧
Notifications
Which events BYDIFF shows in Chrome
The same change event is not notified twice. Clicking a notification opens the relevant site in BYDIFF.
FeaturesWhat is tracked and how visual copies are saved
◎
What is tracked
Core checks always run and do not need to be enabled separately
Text and headingsText blocks, H1–H6
Links and imagesURLs, anchors, ALT text, and files
Metadata and codeTitle, Description, DOM, Schema
Site technologiesCMS, analytics, scripts, and server
Forms and buttonsFields, submit method, and button text
robots.txt and SitemapCrawler rules and sitemap contents
▧WAITING
Site images
Optimized files for saved versions
WebP · quality 78%Maximum side 2560 px · source no larger than 15 MB0
Image limitPRO — English 1,000 unique EnglishAUTO
Last saveAppears after scanning with a connected folderWAITING
◇LOCAL
RulesEnglish
Rules, watched elements, and visual exclusions are stored locally in Scanner Agent
Expected rulesCheck HTTP status, canonical, robots, H1, and text separately from ordinary changes.
No rules yet
Watched elementsEnter the CSS selector of an element and what should be monitored.
No elements yet
Visual exclusionsDefine an area of the snapshot that should be ignored during visual comparison.
No areas yet
Advanced mode · JSON
For advanced users. Changes here stay synchronized with the visual settings above.
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Storage forecast and backup
Local storage growth and a safe backup of settings
EnglishEnglish…—
English / EnglishEnglish.—
▣READY
Visual comparison
Safe HTML+CSS copies of saved versions
Desktop, tablet, and phoneBefore / After viewing is available for saved versions from the local folder without running site scripts
Access & diagnosticsPro access and technical status without changing internal algorithms
★CHECKING…
English PRO
English BYDIFF
EnglishEnglish. Trial English PRO English 7 days; English.
English PRO English 7 days English manual activation via email or Telegram. English.
◉LOCAL
Professional Scanner profile
User-Agent and local headers for private/staging scans
Privacy-first: English. Proxy English User-Agent English browser-rendered English Chrome runtime-English LIVE PASS English.
↔CHECKING…
Scanner Agent
Website connection to the installed extension
Installed versionChecking Scanner Agent connection…—
If Scanner Agent is outdated or unavailable, BYDIFF will show this before a scan starts.
◌
Scanner diagnostics PRO
Current activity and approximate load
STATUS—
CHECKED—
QUEUED—
FOUND—
PROFILE—
JS HEAPn/a
SPEED—
AVG / URL—
MAX / URL—
RETRY—
429 / 503—
NO PROGRESS—
CURRENT URL—
TIME—
CHECKPOINT—
SAFETY LIMITSNot reached
Memory is shown only if Chrome exposes performance.memory. BYDIFF automatically slows down on heavy pages and on 429/503 responses.
MaintenanceClear service data and history only after explicit confirmation
⌫
Maintenance
Temporary data and history cleanup during development