B2B Contact Databases Software

While Apollo.io is a powerful tool, there are a few limitations to be aware of. Most of the phone numbers listed are company lines, not direct dials to individual contacts — which can slow down outreach efforts. Additionally, some job titles are occasionally outdated or inaccurate, and in certain cases, the platform is unable to find a verified email for the contact you're targeting. Review collected by and hosted on G2.com.

Apollo.io is solving the problem of inefficient and fragmented lead generation by centralizing prospecting, contact discovery, and outreach automation into one platform. Before using Apollo, I had to rely on multiple tools to find leads, search for emails, and run campaigns — which was time-consuming and hard to scale.

With Apollo, I can identify high-quality prospects from millions of companies worldwide, get verified contact data, and immediately launch personalized email sequences — all in one place. It’s saving me hours each week, helping me stay organized, and allowing me to consistently reach out to the right people at scale. The result: more leads, better targeting, and faster deal flow. Review collected by and hosted on G2.com.

After using Seamless.AI for one year, I was charged $2,200 for a renewal I did not authorize and was never notified about. Despite reviewing all email folders and running a full Office 365 audit, I found no record of any notice being sent — which is required by law (Florida Statute § 501.165).

When I reached out to Seamless.AI, they claimed they sent emails but couldn’t prove delivery or that I received them. They are refusing to issue a refund, even though they are legally required to notify me 30–60 days before renewal for an annual contract. This is not a simple oversight — it’s a documented pattern of aggressive billing and zero accountability, based on countless reviews I’ve now seen from others in the same situation. Review collected by and hosted on G2.com.

It is enabling me to reach out to potential customers in the area that need my product. Review collected by and hosted on G2.com.

I’ve been paying for the “done-for-you” email accounts and using Instantly to send cold emails, but unfortunately, it hasn’t worked most of the time. The email accounts stopped functioning, which means no emails are being sent — yet I’m still being charged.

Support has been incredibly slow and unhelpful. It takes 12+ hours to get a reply, and you’re stuck dealing with what seems to be AI bots rather than a real person. After nearly two weeks of no email activity, they've acknowledged the issue and said they needed to replace the inboxes and restart the warm-up process — which takes another 2–4 weeks. But even now, the new inboxes haven’t been set up.

Given how essential deliverability and uptime are for cold outreach, this level of support and system failure is unacceptable. I’d recommend choosing a platform with a more reliable infrastructure and responsive human support. Review collected by and hosted on G2.com.

Getting new leads. Review collected by and hosted on G2.com.

ZoomInfo offers a vast platform with a lot to explore, including valuable live webinars. Overall, it’s a great tool, though at times I’ve felt that the data coverage for APAC and EMEA regions could be more extensive Review collected by and hosted on G2.com.

As a Data Operations leader, I use ZoomInfo extensively for account and contact enrichment, data exports, and seamless integration with Salesforce. We also leverage NeverBounce for email verification and use RingLead for deduplication management. Additionally, enrichment my sales team is coordinated through Chorus, ensuring streamlined and accurate data across system Review collected by and hosted on G2.com.

I think some of the job titles could be better categorized, but it’s not a big deal. You just have to spend a little extra time with filters to get exactly what you want. Review collected by and hosted on G2.com.

We found BookYourData to be a smart option for our marketing team. Those who want reliable leads without overpaying should opt for BYD. We’ve seen better conversion rates since switching to it for our prospecting. Review collected by and hosted on G2.com.

Ramp up will be extremely slow. Sending volume per domain is ultra low to ensure maximum deliverability. We are 1 month in and all inboxes are at a 100% sending score. Expect that your 2-3 weeks will be very slow with significant ramp up by end of the first month.

I don't like that I can't get push notifications on my phone or to my regular email with responses, so I end up just having to check the site 4x a day. Review collected by and hosted on G2.com.

Higher volume email outreach without hitting spam or jeopardizing regular domain. Review collected by and hosted on G2.com.

Sometimes the banner of the extension pop up just because we opened an company on Sales navigator and that is a bit frustrating because we don't always want it to pop up. Review collected by and hosted on G2.com.

Cognism helps reduce the time spend in researching the right company / person / and the resume of activities of the company or "Events" also helps when performing cold call to the prospects in finding a proper IceBreaker Review collected by and hosted on G2.com.

There were some dislikes but their team solved them. They even gave me more free credits for testing before purchasing. Now I have subscribed in their annual plan and if everything goes the same, I will renew my account next year, in 2026. Review collected by and hosted on G2.com.

They solved the issues I faced while using this website. They increased my CRM data accuracy and our ROI. Review collected by and hosted on G2.com.

We’ve occasionally seen lighter coverage in very emerging tech segments or non-U.S. regions, but their support team is responsive and always looking to improve. For early-stage companies, the pricing might feel like a stretch, but if you're serious about scaling data-driven outreach, it pays for itself. Review collected by and hosted on G2.com.

A-leads is helping us solve the challenge of feeding our AI models and outbound engines with clean, relevant contact data, without wasting time on manual research or unreliable sources. It’s improved both the performance of our sales/marketing efforts and the accuracy of our data workflows. We've seen higher engagement, lower bounce rates, and faster iteration cycles. For a team that thrives on automation, precision, and speed, A-leads checks every box. Review collected by and hosted on G2.com.

There's nothing I dislike about Wiza. Everything is perfect. Review collected by and hosted on G2.com.

Identify email addresses of our leads. Review collected by and hosted on G2.com.

Occasionally, I encounter some bugs, which are inevitable when a product is growing so quickly. However, the support team is very responsive and resolves issues fast. Also, additional tools, such as email warm-up, would be a great addition to make the platform even more effective. Review collected by and hosted on G2.com.

GetSales.io helps automate and scale outbound lead generation, making it easier to reach potential clients through LinkedIn and email. It saves a huge amount of time by handling outreach sequences, follow-ups, and personalization at scale. Thanks to this, we can generate more leads, increase response rates, and focus on closing deals rather than manual outreach. The analytics and tracking features also help optimize campaigns for better results. Review collected by and hosted on G2.com.

What I dislike about 6sense Revenue Marketing is that while it offers powerful insights and capabilities, the platform can feel complex and overwhelming at first, especially for teams without dedicated resources for setup and ongoing optimization. The learning curve to fully leverage all features—like custom segments, intent models, and advanced integrations—can be steep. Additionally, the pricing structure may be challenging for smaller organizations, and occasional data accuracy or syncing issues with connected systems can require extra monitoring to ensure everything runs smoothly. Review collected by and hosted on G2.com.

6sense Revenue Marketing is solving the problem of wasted time and effort on accounts that aren’t ready to buy by providing clear visibility into which companies are actively in-market and showing intent. It helps overcome the challenge of aligning marketing and sales by delivering shared data and insights, so both teams can prioritize the right accounts and engage them at the right time with relevant messaging. This has benefited us by increasing efficiency across the revenue team, improving conversion rates, and accelerating pipeline growth, as we can focus our resources on high-potential opportunities rather than guessing where to direct our efforts. Review collected by and hosted on G2.com.

Please give us more time to enjoy the free plan. It's seriously addictive! LOL! Review collected by and hosted on G2.com.

It tackles 1 of the most common and time-consuming challenges in sales, lead generation, and email campaign. It identifying, filtering and reaching out to high-quality, targeted leads efficiently.

Success.ai did & benefiting me by hyper-targeted lead generation with minimum keywords I can find truly match of my client's ICP. Time efficiency instead of hours of research, I can get qualified leads in minute, it allows me to focus more on engagement.

It plugs right into my Team's workflow in Salesforce CRM and for my own portfolio in Zoho CRM, and also provides me with responsive customer support team. Review collected by and hosted on G2.com.

Just wish I had it earlier! I will say that because Collective[i] can feel “too good to be true,” it takes our sellers some time to fully trust the AI. But once they see the accuracy of the insights and how much time it saves them, it’s all systems go. The initial skepticism quickly turns into full adoption once they realize how much more productive they can be. Review collected by and hosted on G2.com.

Before Collective[i], our sales team struggled with inconsistent data, inaccurate forecasting, and inefficiencies in sales execution. Now, we have:

- Real-time, AI-driven pipeline insights that proactively highlight risks and opportunities.

- No more manual CRM updates, freeing our sellers to focus on selling.

- Better forecasting accuracy, leading to smarter decision-making.

- AI-driven deal coaching, improving win rates and seller productivity.

Overall, Collective[i] has been a game-changer for our revenue organization. If you're serious about leveraging AI to drive sales performance, eliminate manual work, and improve forecasting accuracy, Collective[i] is a must-have. Review collected by and hosted on G2.com.

None so far , the team has more scope for improvements Review collected by and hosted on G2.com.

User friendly interface , makes our job lot easier Review collected by and hosted on G2.com.

Some delay in syncing call notes to my CRM Review collected by and hosted on G2.com.

There was no way to add outbound calls without increasing headcount. FlashIntel allows my team to meet aggressive outreach goals with little effort. Review collected by and hosted on G2.com.

So far, my experience with Mr. E by EasyLeadz has been smooth and efficient. I haven’t encountered any issues that would qualify as a dislike. If anything, I look forward to seeing how the platform continues to evolve and add even more value. Review collected by and hosted on G2.com.

"Mr. E by EasyLeadz is solving one of the biggest challenges in B2B sales—finding accurate and verified contact information for decision-makers. It simplifies lead generation by giving direct access to potential prospects, which saves us a huge amount of time and effort in manual research. As a result, our outreach is more targeted, faster, and far more effective, ultimately improving our conversion rates and sales pipeline efficiency." Review collected by and hosted on G2.com.

There can be small inconsistencies in demographic data like age or salary, but the names and emails are always accurate, which is what matters most to us. Review collected by and hosted on G2.com.

Visual Visitor Sales Intelligence solves the problem of identifying and tracking website visitors, giving businesses valuable insight into who is engaging with their site. By providing detailed visitor data, it enables our clients to follow up with potential leads more effectively. This insight helps them better understand their audience, prioritize outreach, and increase the chances of converting visitors into sales. It’s a powerful tool for turning website traffic into actionable opportunities. Review collected by and hosted on G2.com.

Nothing! Every time I went into Keyplay, I found more signals that we could use and improve our scoring model. Review collected by and hosted on G2.com.

Keyplay is solving inefficient sales outbound and giving us a new way to understand who is our actual ICP. This has many downstream effects to both how we sell and who we target. Review collected by and hosted on G2.com.

While Autobound automates personalisation at scale, the output can still feel templated or surface-level if not carefully reviewed. It risks sounding like AI-generated fluff rather than genuine, human outreach, especially to senior buyers who can spot automation easily Review collected by and hosted on G2.com.

Problems Autobound Solves,

Time-Consuming Personalization

SDRs spend 15–30 minutes per email trying to tailor outreach, often with inconsistent results.

Low Response Rates from Generic Messaging

One-size-fits-all templates are easy to ignore and don’t resonate with modern buyers.

Lack of Context or Relevance in Outreach

Reps often don’t have the time or research skills to dig into LinkedIn profiles, funding news, or company milestones.

Slow Ramp Time for New SDRs

Junior reps struggle to understand what “good personalisation” looks like and lack confidence early on.

Top-Performer Knowledge Is Not Scalable

The tactics used by A+ reps stay siloed, leaving others guessing how to replicate success.

--

How That Benefits Me

Saves Time: What used to take 20–30 mins now takes seconds. Reps can reach more prospects without sacrificing quality.

Improves Response Rates: Emails feel relevant, timely, and human, leading to higher engagement and meetings booked.

Builds Rep Confidence: Even brand-new SDRs can send emails like top performers, shortening ramp time and boosting productivity.

Scales Best Practices: Turns elite personalisation tactics into repeatable, AI-powered workflows accessible to the whole team.

Integrates Seamlessly: Plugs into tools like Outreach, Salesloft, and Gmail, making it frictionless to inject personalization into sequences. Review collected by and hosted on G2.com.