EDITABLE
Observed at
When it happened. Back-date it to 10:26 if that is when the garage opened and you typed it at 10:27. This is the time that reads as the event.
ClearStack Apps
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PRIVATE INVESTIGATOR LOG
ProofPI
Private Investigator Log
Your case work, written down while it is still true.
ProofPI keeps a chronology of the work you did: when the session started, what you observed and at what time, where you were standing when you wrote it, what the mileage came to, and how it all ends up as one case file. It runs entirely on the phone, with no account and nothing sent anywhere.
14-day full trial, no card.
$1.99/mo · $9.99/yr · $24.99 once.
A session is a chronology
Start the session and the clock and the GPS stamp go down together. Every observation you add after that lands in order, with the time you saw it, and the whole thing closes with an on-station duration and an outcome you pick from the list: subject located, no activity, lost, terminated, completed.
That order is the point. Notes written into a phone at the moment sit in a sequence nobody has to reconstruct afterwards, and the sequence is what the case file prints.
Illustration, not a real case. Every screenshot further down carries the app's own sample records.
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09:12
Session start
GPS stamped 37.77149, -122.41940 (±8 m) · Location: 400 block, residential
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09:41 rec. 09:41
Subject vehicle still on the driveway. No movement.
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10:26 rec. 10:27
Garage opened. Two bags carried out and loaded.
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11:03 rec. 11:05
Departed northbound.
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12:15
Session stop
On station 183 min · Outcome: Subject located
Two clocks on every observation
Nobody writes at the exact second something happens. ProofPI keeps both times rather than pretending there is only one, which is the difference between a note you can stand behind and a note somebody can pick apart.
SET ONCE
Recorded at
The wall-clock moment the entry was actually created. The app writes it once and never overwrites it, not even when you edit the note afterwards.
Both print in the case file, as 10:26 (rec. 10:27). If anyone asks how long after the event the note was made, the file already answers.
What a session holds
Start, stop, on station
Both times, and the duration in minutes worked out from them so the invoice and the file agree.
A GPS stamp that is yours
Latitude, longitude and accuracy at start and at stop — the position of your own phone, documenting where you were while making your own record. It is never anybody else's position, and the app never requests background location.
What you observed
Free text for the area, the subject as observed and the vehicle as observed, in your own words rather than a set of forced fields.
Outcome
Subject located, no activity, lost, terminated or completed. Sessions that produced nothing are worth recording as exactly that.
Photo references
Images attached to the case, each keeping its capture time and an optional caption, and each reappearing in the case file's appendix under that line.
The case around it
Client or account reference, matter number, case type, subjects, the attorney contact, dates opened and completed, status, the billed fee, and the scope you were instructed on.
The app itself
Captures from the shipped build. The firms, references, names and addresses in them are the app's sample data, not anybody's case.
Scroll sideways, or use the arrow keys
Confidentiality is the feature
A case file holds other people's information, and the safest place for it is a device you control. ProofPI has no account to breach, no server to subpoena and no sync to leak. There is no cloud copy, and that is a design decision, not a missing feature.
It also means the responsibility is yours. Keep the phone locked, and remember that deleting the app removes the records with it — ProofPI has no backup file and no cloud restore.
- No account, ever. No sign-up, no email, no password, nothing tied to an identity.
- No network round trip for your data. Cases, sessions, observations, photos and mileage are stored on the device. Nothing is uploaded.
- Privacy screen. A switch that hides the app's contents in the Android app switcher, for the moment you hand the phone to somebody.
- Location only when you ask. The GPS stamp is taken in the foreground, at the moment you tap, and never in the background.
- Ten languages. English, Spanish, French, German, Portuguese, Hindi, Arabic, Japanese, Korean and Chinese.
What you hand to the client
One PDF, built on the phone from what you logged, assembled in the order a reader works through it.
- 01 Case header Client or account reference, matter number, case type, subjects, attorney contact, dates opened and completed, status, billed fee and the scope you were instructed on.
- 02 Session blocks Start and stop, on-station minutes, the start and stop GPS with accuracy, the location, the subject and vehicle as observed, and the outcome.
- 03 The observation log Every entry under its session, carrying both timestamps and your note, in the order it happened.
- 04 Mileage table and totals Date, miles, rate and amount, totalled separately per currency.
- 05 Photo appendix and signature Each image under its capture time and caption, then your signature with your name, license number, licensing board and agency.
What ProofPI does not claim
It is a logbook. It does not make a record admissible, it is not legal or investigative advice, and it cannot tell you what your state or your licensing board requires you to keep or for how long. Whether an investigation is lawful, and whether your records are sufficient, is on you.
The same wording sits under every record, on the case-file cover, in Settings and during onboarding:
ProofPI helps you record your own case work — surveillance sessions, observations, evidence references, and mileage — and prepare a case-file document. It is not legal or investigative advice and does not guarantee that any record meets your state licensing board’s or any court’s requirements. Recordkeeping, retention, and reporting rules are set by your state and licensing board — review and adapt your records to your jurisdiction’s exact requirements. You are responsible for the legality of your investigation and the accuracy and sufficiency of your records.
What it costs
STANDARD TIER
Free
Fourteen days of everything with no card. After that the standard tier keeps running, with the caps above and a banner ad.
FULL
$24.99once
or $1.99 a month, or $9.99 a year
- Unlimited cases, sessions and observations
- Unlimited case-file exports
- Removes the ads
- The one-off price does not renew
Questions
Whose location does the GPS stamp record?
Yours. A session stamp is the position of the phone in your hand at the moment you start or stop, recorded to document where you were while making your own record. The app never tracks anybody else and never asks for background location.
Why are there two times on every observation?
One is when you saw it, which you can back-date if you write up ten minutes later. The other is the wall-clock moment the entry was actually created, which the app sets once and never changes. Both print in the case file.
Does ProofPI make my notes court-ready?
No. It is a record-keeping tool, not legal advice, and it cannot guarantee that anything you produce satisfies a court or your licensing board. What it does is keep your own record consistent, timed and complete enough to be worth reviewing.
Does anything leave the phone?
No. There is no account, no sign-up, no server and no sync. Cases, sessions, observations, photos and mileage sit on the device, and a case file only leaves when you share it yourself.
What is in the case-file PDF?
The case header and scope, then every session with its times, on-station minutes, GPS stamps, location, subject and vehicle as observed, and outcome, then the observations with both timestamps, then the mileage table, a photo appendix and your signature block with license and board.
What does it cost?
Fourteen days of everything, no card. After that the standard tier keeps one case, ten observations and one case-file export, and shows a banner ad. $1.99 a month, $9.99 a year, or $24.99 once removes the limits.
Log the next sit properly
Open the case, start the session, and write the first line while you are still looking at it.