How does retention get released without a fight?

The defects-liability walk stands where the handover walk stood, so the close-out is a measurement rather than a chase. The balance falls due against a graded epoch, and anything still moving is named with its rate instead of held against the whole sum.

A phone with a working camera, walked at a normal pace. No markers on the walls, no tripod stops, no beacons, and nothing to set up before you start walking.

What does the grade actually mean?

A surface is met when at least 3 stations saw it, the angles they saw it from are spread by at least 0.15 of the distance to it, the detail on the face is inside 3.0 mm, and it was seen no more than 60° off square. Anything else is thin, and thin is named on the schedule with the number that fell short.

What happens when a phone cannot do the job?

It says so, and it says what would. An ordinary phone holds 3.0 mm of detail out to 10.2 m square-on, and 5.1 m at the steepest angle still counted. A roof, a soffit, a live carriageway or a confined space is out of reach from the ground, so the walk grades it unseen and names what does reach it.

Does the capture work without a connection?

Yes. The walk, the grade and the dating all happen on the phone, with no signal. It joins the record whenever the phone next has one, and the epoch keeps the time it was captured rather than the time it arrived.

Who can see a capture?

Whoever the capturing organisation says, down to the part of the site. A question about a zone somebody cannot see comes back bounded rather than quietly filtered — nothing answers from what the asker is not allowed to see.

What is not here yet?

We are pre-revenue and we hold no third-party security attestations. That is stated on the page rather than in a footnote. What is built is the record underneath: measurements that carry their units and their ±, epochs that keep their dates, and captures that cannot be restated later.

Record · Verify

Seen well enough, or told why not.

Capture is the easy half. Knowing — on site, before the van leaves — that what you just walked can actually be measured is the half nobody instruments. Verify grades every surface as you walk it: how many angles saw it, how far apart they were, how fine the detail is, how square-on it was seen. Four numbers, published, per surface, on an ordinary phone.

Record header · sheet R-05

Record: SPECIMEN SITE 11
Method: HAND-HELD VIDEO
Camera: ANY PHONE · NO RIG
Criteria: 4 · PUBLISHED
Grade: PER SURFACE
Connection: NOT REQUIRED
Capture: NO CHARGE

First epoch · 24 Mar 20263 epochs on the recordLatest · 21 Apr 2026

Live coverage feedback

The instrument grades the walk, not the walker.

Scroll the walk. Every surface tints as the stations accumulate: cool once it can be measured, amber while a criterion is still short, hatched where nothing has seen it. The numbers under the plan are computed from the walk itself — the sight lines are tested against the building's own walls — so the reading at station 12 is the true reading at station 12.

Live coverage · walk 01 · hand-held, 68° fieldStation 34 / 34 · 85.0 m walked

MET
THIN
UNSEEN

Acceptance criteria

Angles it was seen from: ≥ 3 stations
Spread between them: ≥ 0.15 × the distance
Detail on the face: ≤ 3.0 mm
Angle to the face: ≤ 60° off square

Coverage so far

Met: 14 / 18
Thin: 2 / 18
Unseen: 2 / 18

52% of 280 m² of surface has met every criterion — 88% of the 166 m² a ground stance can reach at all.

Cue

S10 · 1 OF 3 VIEWS · STAND OFF 5.7 M AND SHOOT ACROSS IT

The roof is not a failure of the walk. It is out of reach of a ground stance, and the instrument says so rather than grading it: flown from 10 m above the deck, the same phone reads it at 2.94 mm and the surface is met.

Coverage schedule for the finished walk: 14 surfaces met, 2 thin, 2 unseen.
Surface	Location	Angles	Spread	Detail	Squareness	Grade
S01	South face 1/4	4	7.5 m	1.43 mm	16°	MET
S02	South face 2/4	4	7.5 m	1.33 mm	3°	MET
S03	South face 3/4	4	7.5 m	1.36 mm	9°	MET
S04	South face 4/4	4	7.5 m	1.36 mm	9°	MET
S05	East face 1/3	4	7.5 m	1.39 mm	13°	MET
S06	East face 2/3	4	7.5 m	1.34 mm	6°	MET
S07	East face 3/3	5	10.0 m	1.32 mm	0°	MET
S08	North face, east bay 1/2	4	7.3 m	1.36 mm	9°	MET
S09	North face, east bay 2/2	4	7.3 m	1.06 mm	8°	MET
S10	Recess, east cheek	1	—	2.64 mm	51°	THIN
S11	Recess, head wall 1/2	3	4.4 m	1.57 mm	5°	MET
S12	Recess, head wall 2/2	3	4.4 m	1.70 mm	6°	MET
S13	Recess, west cheek	2	2.5 m	2.42 mm	47°	THIN
S14	North face, west bay 1/2	4	7.1 m	1.12 mm	8°	MET
S15	North face, west bay 2/2	4	7.3 m	1.34 mm	6°	MET
S16		4	7.5 m	1.36 mm	9°	MET
R01	Roof, east bay	—	—	—	—	UNSEEN
R02	Roof, west bay	—	—	—	—	UNSEEN

Specimen structure, specimen walk. The criteria and the arithmetic are the ones the capture app runs.

The method envelope

A lens has a reach. We print it.

A hand-held camera has a reach, and past it a phone stops being a measuring instrument. Rather than hope, the walk prints where that line falls — how far from a face, at what angle, before the detail stops carrying a measurement. Nothing here asks you to take it on faith.

An adjective cannot carry a tolerance. When the reach runs out, the capture says which surfaces fell outside it and what does reach them — a closer stance, a mast, a flight, a scan. A refusal with an alternative is worth more than a grade with no threshold behind it.

Reach at 3.0 mm of detail · ordinary phone

0° off square: 10.2 m
30° off square: 8.8 m
60° off square: 5.1 m

The recipe rack

A walk is for something.

Seen well enough depends on what the capture has to settle. A crack survey and a monthly valuation are not the same threshold, so they are not the same recipe. Each one names its criteria in units before anybody sets off.

RCP-01
Dilapidation baseline
The condition of everything you did not build, recorded before you start work beside it. The neighbour's wall, the road, the pipe you are about to trench past.
- DETAIL ≤ 2.0 MM ON CRACK-BEARING FACES
- EVERY ELEVATION · ≥ 4 VIEWS
- ONE EPOCH · BEFORE POSSESSION
READ BY · OWNER · INSURER · NEIGHBOUR
RCP-02
Interim valuation backup
The month's claimed quantities, walked. Zones that meet the criteria are measurable; zones that do not are listed beside the claim rather than argued about after it.
- EVERY CLAIMED ZONE · MET
- UNMET ZONES · NAMED, NOT OMITTED
- CADENCE · ONE WALK PER VALUATION
READ BY · CERTIFIER · QS · LENDER
RCP-03
Measurement book entries
Where the state's own procedure releases money against measured quantity — a measurement book, an RA bill, a running account — the entry gets a registered capture behind it instead of a typed number alone.
- ENTRY · TIED TO ONE EPOCH
- QUANTITY · VALUE + UNIT + ±
- ITEM GEOMETRY · MET BEFORE ENTRY
READ BY · ENGINEER · AUDITOR
RCP-04
Defects-liability walk
The same stations as the handover epoch, walked again during the liability period. Growth is only readable if the second walk stands where the first one stood.
- STATIONS · ±1.0 M OF HANDOVER EPOCH
- GROWTH RESOLVED AT 0.3 MM
- CADENCE · QUARTERLY + POST-EVENT
READ BY · OWNER · CONTRACTOR · SURETY
RCP-05
Stockpile check
A heap, walked from the ground in a closed loop. Volume comes back as an interval, because a volume from imagery is an interval.
- LOOP · CLOSED · NO GAP > 4.0 M
- ANGLES SPREAD ≥ 0.25 × THE DISTANCE
- VOLUME · ±2–5% BY METHOD
READ BY · SITE ENGINEER · SUPPLIER
RCP-06
Pre-event condition
The whole envelope before the season that damages it. A loss is measured against the last good epoch, so the cheapest moment to document damage is before it happens.
- ENVELOPE · ALL REACHABLE SURFACES MET
- UNREACHABLE SURFACES · NAMED
- EPOCH · DATED WHERE IT WAS TAKEN
READ BY · OWNER · ADJUSTER · ENGINEER

Where the line is

Capture is free. Memory is the product.

Nothing is held back to make a point. The capture measures its own coverage and dates its own frames, on any phone, at no cost. What one walk cannot do by itself is remember — hold one frame of the place for a decade, difference itself against last month, prove years later that it was never restated, or argue with a pay application.

Left of the line

The capture. Free, on any phone.

Live coverage feedback, while you are still standing there
4 CRITERIA · PER SURFACE · ON DEVICE
A graded capture: every surface met, thin or unseen, with the numbers behind the grade
ANGLES · SPREAD · DETAIL · SQUARENESS
Every frame dated and placed where it was taken, before it leaves the phone
DATED ON SITE · NOT ON UPLOAD
An ordinary phone, offline, in a pocket. No rig, no markers, no training day
ANY PHONE · OFFLINE FIRST · NO HARDWARE

Right of the line

The record it can be registered into.

One persistent record of the place, not a folder of walks
ONE FRAME · VERSIONED · DECADES
Epochs: the same surface, re-measured, differenced with an interval
EPOCH N − EPOCH N−1 · ± STATED
A record your own people can check without asking us anything
CHECKED INDEPENDENTLY · ANY TIME
Every number carries value, unit, ±, method, epoch and source
AN ESTIMATE IS NEVER A MEASUREMENT
The paperwork held against the ground, and the difference cited
CLAIMED · INSTALLED · ACCEPTED
Standing agents, and directives that close only when capture shows the change
CLOSED · VERIFIED BY EPOCH N

Capture is free. Memory is the product.

Questions of record

The prerequisites, in the headline register.

Every operational fact a buyer would otherwise have to dig for, stated at the size of a claim.

01How does retention get released without a fight?: The defects-liability walk stands where the handover walk stood, so the close-out is a measurement rather than a chase. The balance falls due against a graded epoch, and anything still moving is named with its rate instead of held against the whole sum.
02What does it run on?: A phone with a working camera, walked at a normal pace. No markers on the walls, no tripod stops, no beacons, and nothing to set up before you start walking.
03What does the grade actually mean?: A surface is met when at least 3 stations saw it, the angles they saw it from are spread by at least 0.15 of the distance to it, the detail on the face is inside 3.0 mm, and it was seen no more than 60° off square. Anything else is thin, and thin is named on the schedule with the number that fell short.
04What happens when a phone cannot do the job?: It says so, and it says what would. An ordinary phone holds 3.0 mm of detail out to 10.2 m square-on, and 5.1 m at the steepest angle still counted. A roof, a soffit, a live carriageway or a confined space is out of reach from the ground, so the walk grades it unseen and names what does reach it.
05Does the capture work without a connection?: Yes. The walk, the grade and the dating all happen on the phone, with no signal. It joins the record whenever the phone next has one, and the epoch keeps the time it was captured rather than the time it arrived.
06Who can see a capture?: Whoever the capturing organisation says, down to the part of the site. A question about a zone somebody cannot see comes back bounded rather than quietly filtered — nothing answers from what the asker is not allowed to see.
07What is not here yet?: We are pre-revenue and we hold no third-party security attestations. That is stated on the page rather than in a footnote. What is built is the record underneath: measurements that carry their units and their ±, epochs that keep their dates, and captures that cannot be restated later.

A capture that cannot state its own coverage is a photograph.

Four criteria, published, per surfaceGrades computed on the device, before you leaveUnreachable surfaces named, never graded quietly

Seen well enough, or told why not.

The instrument grades the walk, not the walker.

A lens has a reach. We print it.

A walk is for something.

Dilapidation baseline

Interim valuation backup

Measurement book entries

Defects-liability walk

Stockpile check

Pre-event condition

Capture is free. Memory is the product.

The capture. Free, on any phone.

The record it can be registered into.

The prerequisites, in the headline register.

Put one walk on the record.