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Hunter.io
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Clearbit
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lemlist
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Apollo.io
mitmproxyMitmproxy is recommended for software developers, QA testers, network administrators, and security researchers who require advanced tools for inspecting and debugging HTTP/HTTPS traffic. It is also beneficial for students and educators in computer science and cybersecurity disciplines who are learning about network protocols.
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We use Apollo with our Sales and BDR team to manage our cold outreach. The strength of the platform is the sequences and cadences that you can set up. Compared to other tools we have used in the past like Salesloft the UI is much easier to navigate. The main limitation is that the quality of data isn't as vast and often I can find prospects on Linkedin but not in Apollo.
mitmproxy might be a bit more popular than Apollo.io. We know about 93 links to it since March 2021 and only 69 links to Apollo.io. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Personal email domains destroy this. Clearbit's Enrichment API returns a null company when it hits gmail.com. Apollo routes personal domains straight to a consumer bucket and skips B2B fields entirely. Even PDL's /person/enrich endpoint โ the most permissive of the major providers โ gives you around 32% hit rate on Gmail addresses versus 74% on corporate domains. I measured this across 6,200 signups for a... - Source: dev.to / 3 months ago
A few things worth flagging: PDL beats Clearbit's historical rates for US and Western European companies, but drops to ~52% match rate for Japan and South Korea specifically. Apollo underperforms on raw company matching but returns significantly more contacts per domain in Prospector-style queries than Clearbit's Prospector ever did โ the tradeoff is more stale titles in the result set. Hunter.io is fast and cheap... - Source: dev.to / 3 months ago
One thing comparison guides consistently get wrong: Clay is not an enrichment API. It's a waterfall orchestration tool that calls People Data Labs, Apollo, Clearbit, and others in sequence for you. It's useful, but it adds 2โ8 seconds of latency per row in my runs and costs more per match than going direct. For a CRM webhook flow where you need sub-second enrichment calls, Clay is the wrong layer to hit first. - Source: dev.to / 4 months ago
Last year I ran the same LinkedIn Sales Navigator export through three enrichment APIs. Apollo matched 61% of the emails. Hunter.io matched 54%. An OSINT-first pipeline I'd built in n8n โ pulling from public sources before hitting any paid API โ matched 79% and cost roughly $0.003 per contact. The delta wasn't magic. It was sequence. - Source: dev.to / 4 months ago
Despite having its LinkedIn Page removed in 2025, Apollo remains a functional enrichment and outreach platform with 275M+ contacts. The free tier includes 10,000 credits and the $49/month basic plan is the cheapest entry point for a combined enrichment-plus-sequencing workflow. Apollo's data collection methods have attracted LinkedIn's attention, but the product continues to operate. The risk I'd assign it:... - Source: dev.to / 4 months ago
Mitmproxy is the gold standard here. It's free, open source, and Python-scriptable. - Source: dev.to / 3 months ago
A Man-in-the-Middle (MITM) proxy sits between your client and the destination server, intercepting and decrypting TLS traffic so you can inspect it in plain text. Before you panic about the name โ this is a standard, legitimate debugging technique. Tools like mitmproxy have been used by developers for years. - Source: dev.to / 4 months ago
Leverage open-source proxy tools like mitmproxy or tinyproxy, which allow you to intercept and modify HTTP requests and responses in real-time. By configuring these, you can simulate different geo conditions:. - Source: dev.to / 6 months ago
I have had great experience scripting and running http://mitmproxy.org for these purposes. I also have set it in production as a dumb caching proxy for upstream services (We do a lot dumb GETs to list/enumerate). - Source: Hacker News / 8 months ago
We used mitmproxy. Itโs lightweight, easy to run, and gives a clean log of every outbound request. - Source: dev.to / 12 months ago
ZoomInfo - ZoomInfo is a B2B database providing detailed business information on people and companies.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Lusha - Search less. Sell more.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Hunter.io - Find all the email addresses related to a domain
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS