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"They feel like an extension of the team."— Matthew M · Google Review
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Data

Need Reliable, Accurate Cold Calling Data?

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How it works

Your List, Built by Experts—In 4 Steps.

Fill Out the Questionnaire

Tell us your target customer – region, industry, size, and more.

We Build Your List

Our data experts use 75+ tools and AI to deliver deeply researched, usable data.

Receive Your CSV

Get 1000 mobile numbers, accurate and reliable, ready to dial.

Start Calling

Hit 50 dials a day. Wrong number? We send you another – no charge.

Cold calling

Your Monthly Cold Calling Power.

Each month, you get a CSV with 1000 mobile numbers, crafted by our data experts to be accurate, reliable, and cost-effective – ensuring your data is usable.

Enough for 50 conversations a day, 20 days a month – sourced with shocking accuracy to boost your pipeline.

Why Harper data

Pitch-Perfect Lists by Data Experts.

Get Your List Now

Deeply Researched Data

Far more accurate than off-the-shelf databases: 75+ AI-powered enrichment tools deliver precise, deeply researched data.

Time and Cost Efficiency

Automate lead generation with our scrapers, saving hours of manual work while delivering reliable, ready-to-use data.

Guaranteed Satisfaction

For every wrong number, we provide a replacement at no cost, ensuring you only pay for accurate, high-quality data.

Enhanced Sales Performance

Build a stronger pipeline with +50% better-fit leads, reducing wasted effort and improving overall conversion rates.

Advanced Targeting

Find top customers in any industry, region, or size using AI-driven filters and lookalike models for precise outreach.

Pricing

One Plan,
Maximum Impact.

Each month, you get a CSV with 1000 mobile numbers, crafted by our data experts.

Start Your Subscription
  • 1000 mobile numbers tailored to your target customer.
  • 50 dials/day, 20 days/month.
  • For every wrong number, we send another - no charge.
  • Delivered as a CSV - ready to go.
£499/month plus VAT

No delays, no fluff - just usable data, every month.

How we build it

Unmatched Accuracy, Expert-Driven.

Harper is a team of data experts using Smart Waterfall Enrichment – 100+ premium providers, 75+ enrichment tools, AI agents, and web scrapers – to build lists with shocking accuracy.

Go to market faster with unique, reliable insights.

Get started

Book Your Free Demo Call with Scott

Ready to take your next step? Schedule a call with our Sales Director to explore how Harper can help your business grow. In just 30 minutes, we'll:

  • Gain a deep understanding of your business and growth objectives
  • Define your Ideal Client Profile and pinpoint your target market
  • Show you exactly how we build high-performing cold outbound systems
  • Explore live client campaigns already delivering measurable results
  • Discover why Harper stands out from other agencies
  • Get all your questions answered on pricing, timelines, and ROI
Scott Sales Director
Book a call