Private investigator alternative: what you can do yourself first
Private investigators are expensive and not always proportionate. Here are the OSINT moves that cover the easy 80% of a typical PI brief — and the cases where you should still hire one.
Published 2026-04-12 · 6 min read · CheckMate Blog
Searches for 'private investigator near me' and 'private detective near me' usually start from one of three problems: a partner you suspect of cheating, a person you cannot find, or a person you are about to do business with and want to vet. PIs are good at all three — and they should be, at $75-$200 per hour. Before you write that retainer cheque, here is what you can do yourself in an hour with the OSINT tools that PIs increasingly start from anyway.
The first phase of nearly any PI engagement is records and OSINT. They run the subject's email and name through commercial people-search aggregators, breach indexes, social-media scrapers, and public records. Only after that desk research is exhausted do they add surveillance, in-person interviews, court-record retrieval, or background-check vendor calls. The desk-research phase is the expensive part of the bill that you can replicate.
- Email-first reverse lookup. Drop the email into checkmate.bio for a categorised account list with profile URLs and confidence scores. This is the modern equivalent of running their email through commercial aggregators and would otherwise be the first thing your PI bills you for.
- Breach exposure check. Run the email through haveibeenpwned.com and Dehashed. Breach data tells you which old accounts they have and whether their security hygiene is reasonable.
- Google and reverse image search. Their name in quotes plus likely qualifiers (city, employer, school). A reverse image search of a photo you have can surface profiles you do not yet know about.
- Public records, where free. US users can hit county property and court records directly via state portals. SEC filings, FAA pilot records, FCC licenses, and similar federal indexes are free and often very telling.
An hour on the four steps above is the price difference between a $50 due-diligence question and a $500 PI engagement. Decide which one your problem actually warrants.
OSINT-and-records research has natural limits. Hire a PI when:
- You need physical surveillance — watching, photographing, following someone in public. DIY surveillance is a fast route to harassment liability.
- You need court testimony. PIs build files that can be admitted into evidence; a forum-thread screenshot generally cannot.
- You need interviews. Talking to neighbours, former colleagues, or estranged family members for a sensitive case is a job for a trained professional.
- The case is high-stakes — divorce with significant assets, child custody, fraud investigation, executive due diligence. The PI's professional standards (and insurance) matter.
- You need access to records you cannot legally obtain yourself: licensed-only databases, paywalled court archives, certain commercial vendors.
PIs report that the most common request is partner-fidelity verification. Most of these cases never need surveillance — the digital footprint settles them. Drop the partner's email into a reverse-lookup tool and check the dating, social, and gaming categories with their last-active dates. A live profile with recent activity is a much stronger signal than anything a parking-lot stakeout would produce, and it costs $0.99 instead of $1500. See our companion pieces on cheating-partner playbooks for the full flow.
If you decide a PI is warranted, brief them like you would a contractor: tell them what you have already done, share the OSINT results you have, and define the scope tightly. The PIs who bill efficiently are the ones whose clients hand them a half-completed file. The PIs who bill expensively are the ones whose clients hand them a name and walk away.
Eighty per cent of a private-investigator engagement is desk research you can do yourself. The other twenty per cent is what you actually pay them for.
CheckMate.bio groups findings into categories (social, gaming, dating, adult, finance, professional, and more) and attaches a confidence score to every match. A score of 80% or higher means the email is almost certainly linked to that service. A score between 50% and 80% is a likely match. Anything below 50% lands in the 'Possible matches' section and should be treated as a weak signal, not a verdict.
- Categories show the kind of accounts that exist — the shape of someone's online footprint.
- Per-service fields (usernames, display names, bio text, last active dates) help you confirm whether the match is really the person you care about.
- Confidence scores help you separate solid matches from noise. Treat low-confidence hits as leads to investigate, not as proof.
CheckMate.bio indexes public and breach-derived data. It does not grant access to private messages, passwords, or anything you wouldn't be able to find with enough patience and the right search queries. Use it for the same reasons you'd Google someone — safety, due diligence, re-connecting with people, or simply knowing what a public profile says about you. Be honest about your reasons, and respect the answer you get.