Guides · Written by Robert Bevis, Illinois licensed private detective · Updated October 31, 2026
The software categories at a glance
| Category | What it's for | What to look for |
|---|---|---|
| Case management | Clients, cases, assignments, status | Case types that match your work; agency accounts |
| Field capture & report writing | Notes, photos and video in the field; the client report | Offline use, timestamps and GPS, industry report format |
| Investigative databases | Locates, addresses, relatives, assets | Permissible-purpose compliance (FCRA, GLBA, DPPA) |
| OSINT & social media | Public profiles, posts, online activity | Capture with date and source; preservation |
| Billing & accounting | Time, mileage, expenses, invoices | Billing tied to the case; payment terms |
| Evidence storage & sharing | Photos, video, audio, documents | Integrity hashing, secure client links, retention |
Case management and report writing
Dedicated investigation case management platforms (Trackops, CaseFleet and CROSStrax are commonly mentioned) organize clients and cases. Report writing is where most investigators lose time: notes from the field have to become a formatted report. PIwitness focuses there: it captures notes offline with timestamps, GPS and SHA-256 hashes and writes the report from them, with billing on the same case.
Investigative databases
Licensed investigators typically subscribe to one or more data providers for locates and background research, such as TLOxp, IRBsearch, Tracers or LexisNexis Accurint. Access requires a permissible purpose under the FCRA, GLBA and DPPA, and your state license. Record the source of each finding in your report.
OSINT and social media
Public social media and web research is now part of most cases. Whatever tool you use, capture each finding with the date, the URL and a screenshot, and keep the screenshot in the case file with where it came from.
Billing and accounting
General accounting usually stays in bookkeeping software, but case billing works best inside the case: time from your field notes, mileage, receipts and invoices with your terms.
How to choose
- List where your hours go each week. If it's reports, start there.
- Check that field capture works offline on your phone.
- Make sure evidence is time-stamped and can't be altered after the fact.
- Confirm the software supports your case types (surveillance, process service, executive protection and so on).
- Compare total monthly cost for your caseload and team size.
Frequently asked questions
What is the best software for private investigators?
There isn't one tool for everything. Most investigators combine a report and case platform, a database subscription and accounting software. If documentation and reports take most of your time, choose software that captures notes in the field and writes the report from them, such as PIwitness.
Do private investigators use AI?
Increasingly, for drafting reports from field notes, transcribing and organizing evidence. Use tools that work only from your verified notes and never add details, since you will testify to the report.
What apps do private investigators use on their phone?
The camera, a dictation tool, a GPS log and a notes app, or one app that does all four and keeps the time and location of each note. PIwitness installs on iPhone and Android from the browser and works offline.