Launch App
Operational AI for Construction Sites

Site AI agents that catch errors before they’re built.

Speak in Hinglish. Vesper checks every observation against the latest drawings, RFIs, BOQ and permits — and challenges you before it’s logged.

Launch App See it in action
01 The problem

The failure isn’t missing data. It’s contradictions.

Site managers work across a tender, a BOQ, a drawing register, RFIs, submittals, DPRs, permits and a phone full of WhatsApp voice notes. Every system unifies documents. None of them notice when they disagree.

TenderedColumn C-5 rebar spacing 200 mm — drawing A-102, Rev 3
Built180 mm on site — per A-102 Rev 4, issued 12 Aug after RFI‑047
ReportedDPR voice note: “spacing as per drawing — Rev 3”

Three truths about one column. Today the gap surfaces at rework, a payment dispute, or an incident — not when it’s spoken.

02 How it works

Voice is the safety gate, not a transcription box.

One loop, run on every observation — in the time it takes to say it.

  1. 01Speak

    Hinglish, noisy, interrupted. Correct yourself mid-sentence — “C-5… wait, C-6” — and Vesper follows.

  2. 02Extract

    Location, element, attribute, value, drawing and claimed revision become structured fields — C-5 · rebar_spacing · 180 mm · A-102 · R3.

  3. 03Cross-check

    Deterministic rules against the latest For Construction revision, RFIs, BOQ, permits and QA hold points. Not a guess — a rule.

  4. 04Challenge & confirm

    A spoken Hinglish challenge via Rime TTS. You decide — log the observation or raise an RFI — linked to the verified drawing.

Demo project · Tower B, G+12, Hinjewadi

03 Benefits

Built to challenge, not just record.

Dictation writes down what you said. Vesper checks whether it’s true — and won’t log it until it is.

Contradiction detection is the core

Every observation is checked against the latest For Construction revision with deterministic rules. Outside tolerance, superseded revision, unsatisfied permit, unreleased hold point — each is caught and spoken back.

observedC-5 · rebar_spacing · 180 mm · A-102 R3
latestA-102 R4 · 12 Aug · For Construction
resultrevision_mismatch → challenge
dimension_mismatchrevision_mismatchpermit_blockerhold_point_blocker

Voice is the safety gate

If a critical field — drawing, grid location, dimension — is uncertain, Vesper refuses to log and asks one precise question instead of guessing.

you“A-10…[drill]… ke hisaab se beam 450 hai”
vesper“A-102 ya A-109? Confirm kiye bina log nahi karunga.”

Template-aware memory

It knows what each log needs before it’s filed — structured from 550+ Formats, QA/QC and PMC templates referenced to IS and CPWD.

Pre-pour hold pointsHot-work fire watchDPR fieldsRFI log

Built for Indian sites

Code-switched Hinglish, CPWD item-rate contracts and IS clause references, drill-level noise, and barge-in when you correct yourself mid-sentence. It sounds like your site because it was designed on one.

HinglishCPWD / IS codesNoisy sitesBarge-inIS 456 Cl. 26.4
04 Template library

550+ templates. Already understood.

Formats, QA/QC and PMC templates indexed from InfraLens-style libraries — so Vesper knows which fields a pre-pour check or a hot-work permit actually requires.

Formats · 100QA/QC · 300PMC · 150
QC-CON-CHK-001QA/QC · Concrete

Pre-Pour Inspection Checklist

IS 456Hold point
QC-STL-CHK-003QA/QC · Steel

Reinforcement Placement Checklist

IS 456Cover · spacing
QC-HSE-PRM-003QA/QC · HSE

Confined Space Entry Permit

PermitGas test
QA/QCConcrete

Formwork Inspection Checklist

Pre-pour
QA/QCConcrete

Slump / Workability Test Report

IS 1199
QA/QCSteel

Rebar Receiving Inspection Checklist

MTCIS 1786
QA/QCSoil

Plate Load Test Report

IS 1888
QA/QCConcrete

Rebound Hammer Test Report

IS 13311NDT
QA/QCSteel

Welding Inspection Checklist

Visual · NDT
QA/QCSoil

Backfilling & Compaction Checklist

Field density
PMC-SAF-PMT-001PMC · Safety

Hot Work Permit

BOCWIS 7969Fire watch
FMT-SIT-016Formats · Site

Daily Progress Report (DPR)

ManpowerProgress
PMC-DSN-LOG-003PMC · Design

RFI Log

StatusResulting drawing
FMT-TND-005Formats · Tender

Bill of Quantities (CPWD)

Item-rateDSR
FMT-SIT-013Formats · Site

Concrete Cube Test Log

IS 5167 / 28 day
QA/QCConcrete

Concrete Pour Register

Pour card
QA/QCSteel

Bar Bending & Cutting Checklist

BBSIS 2502
QA/QCSoil

Pile Installation Checklist

Piling
QA/QCMasonry

Masonry Construction Checklist

MortarPlumb
QA/QCRoads

Bituminous Layer (DBM / BC) Checklist

Roads

Drag or swipe to browse · hover to pause

05 Acceptance scenarios

Tested against the mistakes sites actually make.

Scripted scenarios with deliberate errors and barge-in. The bar: zero observations logged with a wrong drawing reference or dimension — and a spoken clarification for every contradiction.

SCN-01revision_mismatch

Wrong drawing revision

manager“C-5 pe spacing 180 mm hai, A-102 Rev 3 ke hisaab se.”
vesper“A-102 ki latest revision R4 hai, 12 August ki. RFI-047 ne confirm kiya tha. Log karein ya RFI raise karein?”
Challenged before logging
SCN-02dimension_mismatch

220 mm measured, 180 mm drawn

manager“C-6 pe rebar spacing 220 mm measure kiya.”
vesper“A-102 R4 mein C-6 ke liye 180 mm hai, ±10 tolerance. 220 bahar hai — dobara measure karein, ya deviation log karke RFI raise karein?”
Out of tolerance
SCN-03barge-in

“C-5… wait, C-6”

manager“Column C-5… wait, C-6 pe cover 40 mm hai.”
vesper“Theek hai — C-6, C-5 nahi. Cover 40 mm, A-102 R4 aur IS 456 Cl. 26.4 se match karta hai. Log kar doon?”
Correction followed
SCN-04permit_blocker

Hot work, no fire watch

manager“Zone B, Level 3 mein welding shuru kar rahe hain.”
vesper“HWP-0112 active hai, lekin fire-watch check pending hai. Kaam rokiye — fire watch assign hone tak hot work allowed nahi hai.”
Stop work
SCN-05hold_point_blocker

Pour before hold-point release

manager“L4 slab ka pour chaar baje start karenge.”
vesper“QC-CON-CHK-001 pre-pour hold point abhi release nahi hua. QA sign-off ke bina pour blocked hai.”
Pour blocked
SCN-06unknown_reference

Drawing A-109 doesn’t exist

manager“A-109 ke hisaab se beam depth 450 hai.”
vesper“A-109 register mein nahi mila. Aapka matlab A-102 hai ya S-301? Confirm kiye bina log nahi karunga.”
Clarify — refused to log
06 Why Vesper

Others store it. Vesper questions it.

Procore, Aconex, RIB and SiteSetu unify documents. The manager still correlates a spoken observation with the right revision, BOQ item or RFI by hand.

Voice
Existing toolsDictation or Q&ATranscribes what you said, or answers what you asked. Wrong revision in, wrong revision logged.
VesperActive reasoningEvery utterance is checked against the record and challenged before it becomes a log entry.
Data
Existing toolsDashboardsDocuments in one place; contradictions discovered later — at rework, billing or an incident.
VesperContradiction preventionTendered vs built vs reported, reconciled at the moment of observation.
Compliance
Existing toolsStatic formsChecklists that can be ticked after the fact, or not at all.
VesperConversational enforcementPermits and hold points enforced in the conversation — “stop work” is said out loud, in time.
07 Pricing

Start on one site.

Prove it on a live pour cycle before you roll it out. Plans scale by active site.

Pilot30 days
Free

1 site · 30 days

  • Drawing register, RFI and BOQ ingest
  • Hinglish voice logging with contradiction checks
  • 550+ template library
  • Guided onboarding on your project data
Start for Free
SiteFor live projects
Talk to us

Per active site / month

  • Everything in Pilot
  • Permit and QA hold-point enforcement
  • DPR fields filled from verified voice logs
  • Multiple managers and engineers per site
Talk to us
EnterprisePortfolio
Custom

For multi-site contractors & PMCs

  • Everything in Site
  • SSO
  • On-prem deployment
  • ERP integration and custom template libraries
Contact sales

No per-seat surprises. Pricing depends on active sites and integrations — we’ll quote after the pilot.

08 FAQs

Questions from the site office.

Straight answers to what engineers and PMs ask first.

How accurate is Hinglish in real site noise?
Vesper is designed and tested for code-switched Hinglish with drill-level background noise and interruptions. It doesn’t need a perfect transcript to be safe: for critical fields — drawing, grid location, dimension — it reads back what it understood and asks again when confidence is low.
What happens when the agent is unsure?
It refuses to log. If a drawing number, location or value is ambiguous, Vesper asks one targeted question — “A-102 ya A-109?” — instead of guessing. Nothing critical is written without confirmation, and every contradiction gets a spoken clarification.
Where does the project data come from?
From your own record: tender and BOQ, the drawing register with revisions, RFIs, submittals, DPRs, permits and QA/QC checklists. Template structure comes from InfraLens-style libraries — 550+ Formats, QA/QC and PMC templates referenced to IS and CPWD — so Vesper knows what each log needs.
Does it replace Procore or Aconex?
No. Your document system stays the system of record. Vesper is the voice layer on top that checks field observations against that record before they’re logged. Enterprise plans add ERP integration.
What about offline or low connectivity?
Connectivity on site is patchy, so Vesper fails safe: if a cross-check can’t run, it tells you instead of silently logging an unverified observation. The pilot needs a mobile data connection; for sites with strict network constraints, Enterprise supports on-prem deployment.
How is our data kept private?
Project data is scoped to your organisation and sites. Enterprise adds SSO and on-prem deployment so drawings, RFIs and field records stay inside your infrastructure.
Free 30-day pilot · 1 site

Catch the next error before it’s poured.

Bring one drawing register and one live site. We’ll load your revisions, RFIs and permits — your team just talks.

Launch App See it in action

No credit card. Works on the phone your site manager already carries.