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Compare Proven Concept vs Stubborn Marketing

Side-by-side comparison of features, pricing, services, ratings and more.

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Proven Concept

Cold Email Outreach Website

Proven Concept is a UK-based B2B email lead generation agency specializing in fully managed cold email outreach campaigns. With over a decade of experience, they have generated 50,000+ leads across 30+ countries and 60+ sectors.

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Stubborn Marketing

B2B Lead Generation Website

Stubborn Marketing offers a subscription-based marketing agency model with a flat $999/month fee and no contracts. They provide a full suite of services including SEO, advertising, branding, content marketing, and web development, targeting small to enterprise businesses.

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Feature Comparison

Attribute	Proven Concept	Stubborn Marketing
Category	Cold Email Outreach	B2B Lead Generation
Rating	Winner +0.5 higher
Location	Portsmouth, Hampshire	Vereeniging, Gauteng, South Africa
Services	B2B Email Lead Generation Apollo.io Managed Services Domain Warming Custom Data Lists Email Copywriting Inbox Management Campaign Reporting and ROI Analysis Advertising Display Ads Native Advertising PPC Programmatic Advertising Retargeting and Remarketing Video Marketing Branding Brand Strategy Online Reputation Management Content Marketing Content Strategy Content Syndication Copywriting Storytelling Video Production Data Analytics Data Science Data Visualization Machine Learning and AI Marketing Advice Inbound Marketing Lead Generation Market Research Outbound Marketing Marketing Automation Email Marketing Public Relations Corporate Communications Influencer Marketing SEO International SEO Link Building Local SEO Mobile SEO Technical SEO Social Media Marketing Community Management Content Creation Social Media Monitoring Web Development UX Design Web Design Website Maintenance	B2B Email Lead Generation Apollo.io Managed Services Domain Warming Custom Data Lists Email Copywriting Inbox Management Campaign Reporting and ROI Analysis Advertising Display Ads Native Advertising PPC Programmatic Advertising Retargeting and Remarketing Video Marketing Branding Brand Strategy Online Reputation Management Content Marketing Content Strategy Content Syndication Copywriting Storytelling Video Production Data Analytics Data Science Data Visualization Machine Learning and AI Marketing Advice Inbound Marketing Lead Generation Market Research Outbound Marketing Marketing Automation Email Marketing Public Relations Corporate Communications Influencer Marketing SEO International SEO Link Building Local SEO Mobile SEO Technical SEO Social Media Marketing Community Management Content Creation Social Media Monitoring Web Development UX Design Web Design Website Maintenance
Industries	-	B2B Services Fashion Retail Media & Entertainment
Pros	Fast setup and quick results High-quality lead generation Detailed reporting and ROI analysis Flexible scaling of campaigns	Subscription model aligns agency incentives with client success rather than billable
Cons	-	Broad service range may mean less specialization in any single area compared to
Website	Visit Site	Visit Site

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Free Plan Available

You shouldn’t have to overpay for cold email tools. With Mystrika, you won’t.

It does cold email warmup, sequences, unified inbox, and AI writing - all in one place. Every other tool that does this charges somewhere between $100 and $500 a month. Mystrika has a free plan. 500 prospects. No expiry. No card.

The people who consistently book meetings from cold email aren’t smarter. They just stopped leaving money on the table.

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