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About

BulkChecker is a B2B contact verification and data quality platform for teams that need to clean phone number and contact lists before outreach, CRM updates, or messaging workflows. Users can upload CSV or TXT files, run bulk phone validation, carrier lookup, WhatsApp, Telegram, Viber, and other messaging-app checks, then export structured results for cleaner segmentation and operations. The platform supports no-code batch uploads and API-based verification workflows. BulkChecker helps identify invalid, unreachable, duplicate, recycled, or incorrectly formatted numbers, and provides useful signals such as carrier, line type, registration status, and active indicators where available. It is designed for growth, sales, marketing, data operations, and fraud-prevention teams that need faster list cleaning and more reliable contact data at scale.

About

Prelude is a developer-first platform for SMS delivery and user authentication: -Reliable high speed messaging via direct to carrier routes -Built-in OTP generation delivery and verification -Real-time dashboard for deliverability and performance monitoring -Anti-fraud protections to block abuse like SMS pumping -No markup on SMS costs — pay only for API calls -Multi-operator routing means no need for a backup provider -Clean API SDKs and webhooks for easy integration -Friendly responsive customer support via Slack Built for fast moving teams who want simplicity reliability and control.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Growth, sales, marketing operations, data operations, CRM, lead generation, agencies, SaaS companies, and fraud-prevention teams that work with large contact datasets and need reliable phone number and messaging-app verification.

Audience

Any company or developer sending SMS through an API whether for signups authentication alerts or communication at scale

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$1 per 10K checks
Free Version
Free Trial

Pricing

$0.03 per verification
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

BulkChecker
Founded: 2026
Hong Kong
bulkchecker.io

Company Information

Prelude
Founded: 2023
France
prelude.so/

Alternatives

Alternatives

RealPhoneValidation

RealPhoneValidation

RealValidation

Categories

Categories

Integrations

Telegram
Viber
WhatsApp

Integrations

Telegram
Viber
WhatsApp
Claim BulkChecker and update features and information
Claim BulkChecker and update features and information
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Claim Prelude and update features and information