In recruitment, access to a vast and high-quality candidate database is the pillar of successful talent acquisition. Yet most recruiters end up competing for the same people, on the same platform, at the same time: LinkedIn.

Since recruitment's move into the digital age, LinkedIn has developed somewhat of a monopoly on networking. The platform now reports over 1.3 billion members, up from 900 million when this article was first written, and it would be hard to find a professional, especially in tech, without a profile. That dominance has been challenged in court, with LinkedIn accused of operating a monopoly on professional networking.

Owning that monopoly is also why the price keeps climbing. A LinkedIn Recruiter Corporate seat now runs roughly $10,800 to $15,000 per year depending on your contract, with InMail overages around $10 per message on top. LinkedIn does not publish Corporate pricing at all: every seat is quoted per account, which tells you most of what you need to know about the negotiating position you are in.

It is no wonder recruitment businesses keep looking elsewhere. There is more to the recruitment world than LinkedIn, and here we will go through the other platforms that can enrich your recruitment database.

Read the database numbers with suspicion

Before the list, one warning that matters more than any individual entry. Database size is close to a vanity metric. Every platform below advertises a headline number, and almost none of them define it the same way. Some count registered accounts that were opened once in 2014. Some count monthly visitors. Some count "sourceable profiles" assembled from third-party data.

What actually decides whether a source is worth your time is reachability: can you get from a profile to a reply? A database of 245 million CVs you cannot message is worth less than 50,000 profiles with working email addresses. Volume is the easy part of sourcing. Contact is the expensive part, and it is the part every pricing page is built around.

The second warning: candidate databases are not permanent. Two platforms that appeared in earlier versions of this list are gone or diminished. Polywork, which raised over $40 million from backers including Stripe's Collison brothers, shut down on 31 January 2025. Monster, a name older than most recruiters' careers, went through Chapter 11. Build your pipeline on someone else's startup network and you inherit their runway.

Here are the types of recruitment databases we cover in this blog:

1. Job boards
2. Social platforms
3. Freelancer marketplaces
4. Other platforms

1. Job Boards

Job boards can be a great way to find relevant profiles for your recruitment database. According to Glassdoor, candidates on the hunt for a new job use 8 different job boards on average, so no single board sees your whole market.

The important structural change since 2023 is consolidation. The job board category is shrinking, not growing: one company (Recruit Holdings) now owns the two biggest Western boards and is merging them, and the third-biggest name went bankrupt. Here is where each one actually stands.

Indeed

Indeed is the most popular job-specific platform on the web, and its own employer page puts its searchable pool at 245 million resumes. Recruiters reach that pool through Indeed Smart Sourcing, the product formerly known as Indeed Resume.

The free posting loophole has largely closed. This is the biggest practical change to Indeed in years, and older guides (including the first version of this one) still get it wrong. Indeed now caps employers at three free jobs per calendar month, each visible for up to 30 days, down from 120 days previously. Indeed itself says organic visibility for free jobs is neither guaranteed nor consistent, which in a competitive role means your free post quietly sinks.

Indeed is still very effective for sourcing candidates who do not use LinkedIn, especially in operations, logistics, healthcare and hourly work where LinkedIn coverage is genuinely poor. Just budget for it as a paid channel rather than a free one.

Database: 245m resumes

Glassdoor

Glassdoor started as a platform where current and former employees anonymously review companies. Because job seekers check reviews and salary data before applying, it became a job board by gravity rather than design, and its strength for recruiters was always employer branding rather than raw profile volume.

Glassdoor is no longer an independent database. Recruit Holdings, which has owned Indeed since 2012 and bought Glassdoor in 2018, is folding the two together: Glassdoor's operations were formally integrated into Indeed in late 2025 alongside 1,300 job cuts across the two brands, and from 18 November 2025 new Glassdoor users must sign in with an Indeed account.

Treat Glassdoor as an Indeed surface with a review layer, not as a second source. If you are already buying Indeed, you are largely buying this. It remains the best place to see how candidates talk about your company before they talk to you, which is worth checking even if you never post a job there.

Database: Merging into Indeed's

Monster

Monster needs a health warning rather than a feature list. CareerBuilder + Monster filed for Chapter 11 bankruptcy in June 2025, carrying $392.5 million of debt after revenue fell roughly 40% from its post-pandemic peak.

The brand survived the process. BOLD, a career-tech company founded by two former Monster executives, completed its acquisition of the CareerBuilder + Monster job boards in August 2025 with a $28.4 million winning bid, and both continue to operate as standalone brands. Other pieces went elsewhere: Valnet took military.com and fastweb.com, Valsoft took Monster Government Services.

Draw the honest conclusion. A database that sold for $28.4 million is not a database with 70 million engaged candidates in it, whatever the marketing says. Monster can still be worth a look for specific US blue-collar and government-adjacent niches, but do not build a sourcing strategy on it and do not sign a long contract with it.

Database: Legacy US pool, post-bankruptcy

2. Social Platforms

While LinkedIn is the primary professional player, other social platforms should not be overlooked. It may not be the most conventional way to source, but social platforms can be a dark horse for finding profiles, particularly for engineers, designers and other people who actively avoid recruiter-heavy networks.

The trade-off is consistent across all of them: you get intent and personality signals you will never find on a CV, but you get no structured data, no search operators worth the name, and no contact details. Social sourcing produces short, high-quality lists slowly. It does not produce volume. Two platforms are worth your attention.

Reddit

Reddit replaced Polywork on this list, and it is a straight upgrade. Reddit reported 126.8 million daily active uniques and 493.1 million weekly active uniques in its Q1 2026 results, and unlike a startup network it is a profitable public company that will still exist next year.

What makes Reddit useful is not the size, it is the sorting. Professionals cluster into subreddits by exact specialism, and they post about what they are actually working on, what they are paid, and how they feel about their employer. That is the raw material of a good outreach message. The catch is that Reddit is pseudonymous by design and openly hostile to recruiters who spam, so the play is participating in a community rather than harvesting it. We go deeper on the tactics in our guide to sourcing talent on Reddit.

Database: 126.8m daily active uniques

X (formerly Twitter)

X needs no introduction, but its utility for finding and contacting candidates does. Used properly it is a live feed of who is building what, who just left a company, and who is unhappy where they are. Owner Elon Musk has claimed 600 million monthly active users, though X has been private since 2022 and publishes no audited figures, and independent estimates land nearer 560 to 570 million. Treat the number as a ceiling, not a fact.

Three things make it worth a slot in your sourcing arsenal:

• Real-time signal: layoffs, funding rounds and resignations surface here first, and a warm message sent the week someone's company implodes outperforms anything you send cold
• Open profiles: many technical people list a personal site or email in their bio, which is more than LinkedIn gives you for free
• Hashtags and ads: targeted, industry-specific tags amplify job posts, and X sells advertising against them

Be realistic about the ceiling. X has no recruiter product, no CV data, and a user base heavily skewed to a few professions (developers, crypto, media, politics). For a senior backend engineer it can be excellent. For a warehouse supervisor it is a waste of an afternoon. Use it as a supplement to your main sources, never as one of them.

Database: ~600m monthly users claimed, unaudited

3. Freelancer Marketplaces

With the workforce leaning towards a freelancer revolution, freelancer marketplaces are a good place to discover untapped talent, including people who would never answer a permanent-role InMail but will answer a project brief.

Read these headline numbers especially carefully, because "registered users" on a marketplace counts every account ever opened, including clients as well as freelancers, and including the many that were opened once and abandoned. The useful signal on a marketplace is not the size of the pool, it is whether the person has recent reviews.

Upwork

Upwork is a leading freelancing platform spanning writing, design, programming and more, and it is a public company with reported financials, which makes it the most transparent option here. Work history and client ratings are visible on profiles, so you get evidence rather than self-description.

Database: Over 18 million registered freelancers

Toptal

Toptal is a screened network rather than an open marketplace, focused on software development, design and finance. It claims to accept only the top 3% of applicants, which is its own unaudited marketing claim and should be read as such, but the practical effect is real: it is a curated shortlist, not a database you search.

Database: Curated network, "top 3%" claimed

Freelancer

Freelancer is the biggest platform by raw account count, covering everything from writing and design to coding and marketing. Its own about page reports over 89 million employers and freelancers across 247 countries and territories, up from roughly 50 million in 2023.

That number is exactly the kind you should discount. It is a combined count of both sides of the marketplace, accumulated over more than a decade, and Freelancer's model competes hard on price, so the quality distribution is wide. It is a volume source, not a quality source.

Database: Over 89 million registered accounts (both sides)

4. Other Platforms

HeroHunt.ai

HeroHunt.ai is a recruitment engine that finds public profiles and contact details of candidates across major networking platforms in one search, rather than making you run the same query on six sites.

Recruiters can sign up for a free trial, parse a job description into the AI and get matched with qualified candidates in minutes. There is a built-in ATS that saves those candidates and an Engage feature for sequences and automated email. The relevant point for this article is that it is built around the reachability problem rather than the volume one.

Database: Over 1 billion candidate profiles

GitHub

GitHub is where the world's software actually gets written, and the developer count has grown faster than almost any platform on this list. Its Octoverse 2025 report puts it at more than 180 million developers, with over 36 million joining in a single year, roughly one every second.

There is no official recruitment feature, so you use advanced search to find people by language, location and activity. The advantage over any CV database is that you are looking at the work itself instead of a claim about the work. The disadvantages are that most profiles have no email, a large share of the recent growth is students and hobbyists rather than hireable engineers, and commit activity says nothing about whether someone wants to move.

Database: Over 180 million developers

Stack Overflow

Stack Overflow is the go-to Q&A forum for developers, and each user has a profile showing contributions, reputation and expertise by tag. In theory that is a beautifully structured skills database.

In practice, the signal is decaying fast. Monthly question volume has collapsed since ChatGPT launched, falling to levels the site has not seen since 2009, because developers now ask an AI instead of a forum. The archive of profiles is still there and reputation earned in 2019 still tells you something real about a person's depth. But recent activity is thin, so it works as a way to verify a candidate you already found, and no longer as a way to find one.

Database: Large archive, sharply declining activity

XING

XING is the professional network for German-speaking regions, with roughly 22.5 million members across Germany, Austria and Switzerland. Like LinkedIn it has a recruiter product, TalentManager, which lets you search and message candidates directly.

XING is the one genuine regional exception to LinkedIn's monopoly and is worth a seat if DACH is a real market for you, particularly for Mittelstand and non-tech roles where local candidates often keep a XING profile and neglect their LinkedIn one. XING does not publish TalentManager list pricing publicly, so expect a quote. Outside DACH it is close to useless.

Database: 22.5m members, DACH region

Apollo.io

Apollo.io is not a candidate database and does not pretend to be one. It is a B2B contact database that recruiters use as an enrichment layer: you have already found someone on GitHub or Reddit or X and have a name and a company, and Apollo turns that into a verified email or a direct dial so you can reach them without paying for an InMail.

Its own site reports 230 million+ contacts and 30 million+ companies. Note that this is smaller than the 275 million this article previously claimed, and smaller than Indeed's resume pool, which is the point: these databases are not interchangeable. Apollo knows people by their job at a company. It does not know their skills, their salary expectations, or whether they are looking.

Database: 230m+ contacts, 30m+ companies

Where this leaves you

LinkedIn's monopoly is real and its pricing reflects it, but the alternatives are not a like-for-like swap. They are a set of partial sources with different failure modes: Indeed has the volume and now charges for visibility, Glassdoor is being absorbed into Indeed, Monster is a post-bankruptcy legacy asset, GitHub and Reddit have signal but no contact details, Stack Overflow's data is aging, and XING only works in one region.

The practical move is to stop shopping for a single replacement database and start assembling two things: a source of profiles that suits your roles, and a way to contact the people it finds. Most recruiters overspend on the first and underinvest in the second, which is why they end up back on LinkedIn paying $10 a message. Diversify your search, verify the headline numbers before you believe them, and remember that the platform you standardise on today may file for Chapter 11 the way Monster did.

Figures in this guide were verified against primary sources in July 2026. Platform pricing and database claims change often: check the vendor's own page before you buy.