Apollo.io released its 2026 Go-To-Market Effectiveness and Data Quality Report on April 8, an independently conducted evaluation showing that its AI-powered platform materially improves email deliverability performance and produces cold outreach conversion rates that exceed industry benchmarks.
The report carries weight because it was not produced internally. Apollo commissioned The Tolly Group, a well-known independent technology testing firm, to run a real "from scratch" live go-to-market campaign on the platform, contacting 384 target users at 205 companies over one month, with three full sequences completed for 169 contacts. That methodology matters: live campaign results are harder to selectively engineer than controlled lab tests.
What the Tolly Group Actually Tested
Beyond measuring outreach outcomes, Tolly used the campaign to evaluate contact data quality, AI feature benefits, the platform's user interface, and several other operational factors. The firm also ran a cost and feature comparison against Apollo's direct competitors, ultimately concluding that Apollo is the most cost-effective and simply priced solution and the only vendor in its peer set offering full-stack capabilities as standard.
Apollo's CMO, Marcio Arnecke, called the evaluation "exceptionally strong" evidence of platform value, noting that while customer feedback is constant, independent third-party testing is the most reliable performance indicator the company has.
Why Deliverability Is the Central Issue Right Now
The timing of this report is deliberate. Email deliverability has become measurably harder over the past 18 months. Gmail now enforces a spam complaint threshold of just 0.1% for senders exceeding 5,000 daily emails, with SPF, DKIM, and DMARC authentication required, and tightened enforcement in November 2025 means non-compliant senders face temporary or permanent rejection across all three major inbox providers simultaneously.
A good deliverability rate for cold outreach is anything above 95%, yet many outbound teams fall well short of that threshold. According to data compiled by Martal Group, improving deliverability alone can increase lead volume by 50% and reduce marketing costs by 33%. For growth teams running outbound at scale, that is not a marginal improvement.
The Hunter.io State of Email Outreach report, based on 31 million emails, found that the average cold email sequence reply rate currently sits at 4.5%, a slight improvement from 4.1% in 2024. Average open rates sit at roughly 30%, which is below where most teams should be targeting, partly reflecting the impact of tightening spam filters at Gmail and Outlook.
The Benchmark Gap Apollo Claims to Beat
The significance of the Tolly findings comes into sharper focus against those baselines. According to Instantly's 2026 Cold Email Benchmark Report, which analyzed billions of cold email interactions from over 700,000 businesses, the average reply rate across campaigns is 3.43%, with only top performers exceeding 10%.
Typical cold email open rates in 2025 and 2026 cluster around 42%, with reply rates averaging 3% across industries, though highly targeted and personalized campaigns can push that figure to 8 to 10%. Apollo's Tolly-validated performance, the company says, beats these numbers.
The report also coincides with Apollo earning recognition across several of G2's 2026 Best Software Award lists, including Best Sales Software, Best AI Software, and Best Global Software. It was the only sales intelligence platform to appear on G2's Best AI Software Products list.
What This Means for Marketers and Growth Teams
The practical implication for business owners and email marketers is straightforward: platform choice directly affects whether your emails arrive and get read. In 2026, email infrastructure and deliverability have become critical factors that determine the success or failure of cold email campaigns. No matter how strong your subject lines or personalized your content, emails that land in the spam folder will not be seen.
The direction of travel in high-performance cold outreach is shifting from volume to precision, with elite teams using intelligence-led outbound and hitting prospects at the right moments using intent signals. AI agents now handle roughly 80% of research and sequencing work for top-performing teams, freeing people to focus on positioning and high-value conversations.
For teams evaluating whether a unified platform like Apollo actually delivers on its deliverability claims, the Tolly report gives a data point grounded in a real campaign rather than vendor marketing. The core finding: Apollo's unified, AI-powered GTM platform materially improves outbound performance for email deliverability and produces conversion rates that exceed industry benchmarks. Whether that holds across different verticals, list sizes, and sending volumes is a question each team will need to test against its own baseline, but the independent methodology makes these results a credible starting point.
