01
Upload your list
Import CSV or TXT files with phone number data, then confirm the task settings before processing.
Zalo Days Checker
Detect Zalo account activity days and last online time.
Price (per 10,000 numbers) $8 USD
Detect Zalo account activity days and last online time. Ensure you're reaching active users and filtering out dormant accounts.
Detect Zalo account activity days and last online time.
Price (per 10,000 numbers) $8 USD
Detect Zalo account activity days and last online time. Ensure you're reaching active users and filtering out dormant accounts.
No account, number, or SIM required
Every check runs through official platform APIs on our own infrastructure. You never connect, bind, or use your own account, phone number, or SIM card — just upload your list or call the API and get results.
- Activity Detection: Verify how long accounts have been active.
- Last Online Tracking: Know when a user was last online.
- Cost Efficiency: Save money by skipping inactive accounts.
- High Accuracy: Reliable activity data for targeting.
Detection signals
What Zalo Days Checker detects
Detect Zalo account activity days and last online time. Ensure you're reaching active users and filtering out dormant accounts.
Registration status
Confirms whether the phone number is registered on Zalo (yes or no), so you can filter out unregistered numbers before outreach.
Days since last online
Detect Zalo account activity days and last online time.
Passive, no contact
Reads registration signals only. The account holder is never messaged, logged in to, or notified.
Workflow
How Zalo Days Checker works
Use Zalo Days Checker as part of a repeatable list-cleaning workflow before outreach, CRM imports, or audience segmentation.
02
Run the check
NumberChecker.AI processes the file in bulk and returns structured status signals for each row.
03
Export segments
Download results and route clean, matched, unmatched, or review-needed rows into your next workflow.
Outputs
What you can review after the check
number
activated
Use cases
Where teams use Zalo Days Checker
List cleaning
Remove unsupported or low-confidence records before campaigns or imports.
Audience segmentation
Create groups based on platform, email, phone, or account-related signals.
Review workflows
Send uncertain or high-value records into a separate internal review queue.
Related checks
Pair Zalo Days Checker with related products
Explore checks that teams often run before or after this product.
Phone Number Validation
Validate numbering format, line type, and reachability signals before platform-specific checks
Number Active Checker
Detect phone number activity level via big-data analytics to improve SMS delivery and reduce costs
High-value Users Checker
Identify high-value phone users via big-data signals for better targeting and prioritization
E-commerce Activity Checker
Filter out numbers recently active on e-commerce platforms and reach high-converting users with real purchasing habits.
FAQ
Zalo Days Checker questions
Can I check phone numbers against Zalo in bulk? +
Yes. Upload a CSV of numbers or call the REST API, then download a result file with a registered or not-registered verdict for every number. You are billed only for successful checks.
Does the check message or notify the person? +
No. The check is passive and reads registration signals only. Nothing is sent to the number, and the account holder is never contacted or notified.
Is there a free trial? +
Yes. New accounts receive free checks on signup, and every check is pay-as-you-go with no monthly fee.
Ready to run Zalo Days Checker at scale?
Compare pricing, review API options, or create an account to upload your first production list.
