Callobra — Operational Intelligence for Construction. One Platform. Zero App Fatigue.

The Problem

Great engineers.
Wrong system.

Construction is the second-largest industry on Earth — 13% of global GDP, 7% of the workforce — yet it hasn't meaningfully improved productivity in 80 years. The root cause is one word: miscommunication. And it has a repeatable shape: the cascade.

The cascade failure — how one email breaks a project

A subcontractor's supplier delays the window shipment by two weeks. Could be pipes. Could be the electrical panel. Could be structural steel. The email lands with a project manager who reads it in isolation — and on a construction site, every task is a node on the Critical Path Method (CPM) graph. Move one node, and every dependent node moves with it. Façade cladding stalls. Drywall stalls. HVAC commissioning stalls. The painters arrive on schedule anyway and bill a full day for empty rooms. The penalty clause activates. And because the same subcontractor crew is committed to three other projects next month, the delay propagates outward — damaging schedules the original email never mentioned. This is not bad management. It's a network-science problem masquerading as a communication problem — and it happens on every project, every week.

1

One email arrivesWindows delayed two weeks

30

Up to 30 stakeholders1 client · 1 GC · 4–8 engineers · 22 subcontractors

12

5–12 disconnected systemsProcore · SAP · Oracle · ERP — each needs its own upload

⚠

Penalty clause activatesDamage done weeks before anyone connects the dots

$95B

Total disputed amount across 2,200 audited projects in 114 countries — internal industry causes only.

HKA CRUX Insight 2025 · 8th annual report

33.4%

Average disputed amount as a share of the contract budget — one in three project dollars lands in dispute.

HKA CRUX Insight 2025

65.8%

Average schedule overrun versus the original project timeline.

HKA CRUX Insight 2025

$43M

Average value of a single construction dispute in North America.

Arcadis Global Construction Disputes Report 2024

6 / 9

Years in which the #1 root cause of construction disputes was documentation errors and omissions.

Arcadis · 9-year cumulative trend

1% vs 3.6%

Construction productivity growth over 20 years — manufacturing grew 3.6×.

McKinsey Global Institute

Industry Evidence · Verified · 2025

Four causes.
$95 billion in damage.

Primary-source data from HKA CRUX Insight — analysis of 2,200 construction projects across 114 countries. Four internal causes do nearly all the damage. We exclude natural disasters and macroeconomic shocks; these are losses caused by industry mechanics alone — and they are exactly what Callobra is built to eliminate.

44.8% of projects affected ~$43B in disputed value

Inaccurate / late design information

How Callobra addresses thisEvery revised drawing, RFI response and design clarification flows through one channel. The platform timestamps which stakeholder received which version, when — eliminating the “I never got the latest plans” defense.

28.0% of projects affected ~$27B in disputed value

Scope change

How Callobra addresses thisEvery change-order email is structurally captured, linked to the affected work packages, and routed for one-click approval. The cascade engine traces which downstream tasks, costs and deadlines move with it — before the dispute can form.

19.5% of projects affected ~$19B in disputed value

Poor contract administration

How Callobra addresses thisContracts, lien waivers, insurance certificates and payment milestones live as structured records — not buried in inboxes. The platform flags missing administration steps in real time, before they escalate into contractual default.

19.4% of projects affected ~$18B in disputed value

Subcontractor / supplier interface failures

How Callobra addresses thisOne platform shared across the entire supply chain — homeowner, GC, subs, suppliers. The interface itself disappears. Single-entry communication means every party reads the same source of truth.

Total disputed value across the 4 internal causes ~$95B across 2,200 audited projects · 114 countries · HKA CRUX Insight 2025

All figures cite primary, published industry reports. Verifiable: hka.com/crux-insight · arcadis.com · FDIC 2021.

The Solution — Callobra

One entry point.
Every system, instantly.

Callobra is not email-management software. It is operational intelligence for construction — cascade-aware logic built on top of the communication layer that already exists on every project. One email read, one confirmation clicked — every system updated, every stakeholder notified, every record filed.

01

Email arrives

The universal layer every contractor, supplier and sub already uses — no new behaviour to learn.

02

AI reads it in context

It knows the project, the supply chain and the dependent work packages from every confirmed interaction.

03

Traces the cascade

Identifies exactly which of the 30 stakeholders need to know — and what each one must do next.

04

One click updates all

Every connected ERP, scheduler, document vault and accounting system — one version of the truth, everywhere.

90days to the moat

Human-in-the-loop architecture

The data moat that compounds

Callobra never replaces human judgment. Early on, AI suggests and the user confirms with one click — building the project knowledge base. As the database grows, the platform becomes increasingly autonomous. After three months it knows every supplier, every subcontractor pattern, every project structure. The switching cost becomes substantial. That is the moat.

The Three-Phase Platform

Enter through email.
Own the whole stack.

We enter through email because it's universal. Once we own the single-entry communication layer, every transaction in construction becomes accessible. Each phase funds the next.

1

Phase 1 · Now

Cascade Email Intelligence

AI reads construction emails and understands project context
Traces full supply-chain impact of any change
Single entry updates all connected ERPs and systems
Human confirms with one click — no retraining
Document vault, contract & invoice tracking
Verified project history that lowers insurance and financing costs
Four languages at launch: EN · DE · PT · ES

Revenue$90 flat · $199 · $499 per seat / month

2

Phase 2 · Year 2

Materials Marketplace

The platform already knows what every project needs and when
Verified supplier network with real-time pricing
Direct ordering inside the platform — no new login
Delivery tracking linked to project schedule
Volume aggregation across SMBs — better prices
Warranty and claims management simplified

Revenue1–3% of material value ordered

3

Phase 3 · Year 3+

Embedded Micro-Banking

The most accurate real-time SMB financial data in construction
Project-loan origination via bank API partnerships
AI credit scoring from project history — not balance sheets
SMBs banks couldn't underwrite — now bankable
White-label banking products for regional lenders
Precedent: Constrafor $264M S-A · Levelset $500M exit

Revenue~2% origination + lending spread

The compounding logic. Phase 1 builds the user base and the data moat. Phase 2 monetises the demand intelligence — we already know what every project needs. Phase 3 monetises the financial data — we already hold the most accurate SMB construction credit data in the world.

Three surfaces · One platform

Pricing that signals seriousness.

One platform, three user surfaces — plus a measurable benefit on top: tracked project data that helps subscribers reduce their insurance and financing costs.

Homeowner

$90/mo

$1,080 / yr · 2 seats included

B2C you + your partner

AI email organiser, document vault and contractor portal. One flat package — two seats so you and your partner can follow the project together. Add a third seat for the architect at extra cost.

Subcontractor

$199/seat/mo

~$19,100 / yr · 8 seats avg

B2B 5–25 staff

Invoice tracking, multi-project view and single entry into all connected systems. Every approved interaction builds a verifiable history that lowers insurance and financing costs. Per seat — every PM, foreman and accountant who touches the project.

General Contractor

$499/seat/mo

~$180K / yr · 30 seats avg

B2B mid-market

Portfolio finance dashboard, full cascade intelligence, ERP integrations. Per seat for the entire ops team — estimators, PMs, schedulers, controllers.

The hidden return on a subscription

Every approved email, change order and document Callobra captures becomes structured, time-stamped project history. Tracked project data unlocks lower insurance premiums and better lending terms — because insurers and lenders price risk on visibility, and most construction SMBs have none.

Two pricing models, one platform. Homeowner is a flat $90/month package — a couple can follow their renovation together, both with full access. Subcontractors and GCs scale per seat: a 12-person sub becomes ~8 paying seats once estimating, PMs and accounting join. A mid-market GC becomes 30+ seats. Revenue compounds with adoption depth — every new role added inside an existing B2B account is incremental ARR with zero acquisition cost. Why $90 and not less? A typical home renovation costs $30K–$500K and runs 6–24 months. $90/month is one dinner for the largest financial decision of most people's lives. A low price communicates low value — and signals to subcontractors this isn't a serious platform.

Go-to-Market — The Trojan Horse

We never sell to the
inertial buyer.

Direct B2B sales into construction is a graveyard — conservative firms, multi-year procurement, IT resistance. We bypass all of it by entering through the one stakeholder with personal urgency and zero corporate inertia: the homeowner. The same playbook that put Slack and DocuSign inside enterprises through end-user pull.

1

Homeowner subscribes — $90/month flat

Acquired through TikTok, Instagram, Pinterest and YouTube renovation channels. AI organises their entire project. $90/month is one package — two seats included, so a couple can follow their renovation together with full access.

2

Homeowner invites their subcontractors

Quotes, contracts, invoices and schedules all flow through Callobra. The subcontractor has no choice — it's their client's system. Zero sales effort.

3

Subcontractor uses it free on the first project

The first time they experience structured work, on-time payments and 4.2 hours a day given back. Zero training. Zero pitch. They just feel it.

4

Subcontractor brings it to their next 10 projects

Pays $199/seat/month — and seat count expands as more of their team joins. PMs, foremen, the office accountant. Each new role added is pure expansion ARR, no acquisition cost. The network effect begins, and each project deepens the AI data moat.

5

General contractor adopts the enterprise tier — bottom-up

Multiple subcontractors are already on Callobra. The most conservative buyer in any industry adopts without ever being sold to — converted by their own supply chain.

Market Size — Honest Numbers

Four markets. From day one.

We don't multiply every firm by the subscription price and call it a market. Below: real firm counts in our four launch markets, and the Series A milestones we commit to in 18 months.

EN — United States

3.66M

SMBs · SBA 2025

Priority 1

DE — DACH

~400K

firms · Eurostat

Priority 1

PT — Brazil + Portugal

114K+

firms · $127B BR market

Phase 2

ES — Spain + LATAM

500K+

firms · largest by pop.

Phase 2

Series A milestone — by month 18AccountsMonthly revenue

B2C homeowners · $90 flat (2 seats included)300$27,000/mo

Subcontractors · 8 seats avg × $199400$636,800/mo

General contractors · 30 seats avg × $49920$299,400/mo

Total ARR run-rate—~$11.6M

These are the numbers we walk into a Series A meeting with. Not a total addressable market multiplied by an imaginary penetration rate — 720 paying accounts, ~4,400 active seats, $11.6M ARR run-rate. Conservative because B2B per-seat economics compound: every new role added inside an existing account is pure expansion revenue with zero acquisition cost.

Why This Founder

Five dimensions of the problem.
One person.

Construction tech doesn't reward founders who read about the problem. It rewards founders who have personally lost money to it — on both sides of every contract, in every role, on three continents.

GT

Dr. Gabor Toldy

Founder & CEO

Track20+ years · 100+ projects · 30+ countries

BuiltAshgabat Int'l Airport · Kistefos Museum (NO) · Hungexpo (HU)

CompaniesToldy Consult Kft. · Toldy Construct Kft.

NetworkForbes Hungary Business Club · MIT xPRO · AECOM (T. Ratajack)

MVPLive at bestapp2.vercel.app — built with Claude + Gemini AI

Architecture · DLA

Doctorate. 100+ delivered projects across 30+ countries — he has stood on the site.

Law · PGD

Contracts, lien waivers, warranty & claims, fintech compliance — critical for all three phases.

Economics · PGM

Financial product design, pricing strategy and investor negotiation.

Data Science

Designs and understands the AI and cascade-intelligence layer personally.

Systems Engineering

Single-entry multi-system integration is his professional domain — twenty years of it.

University Lecturer

A direct pipeline to the next generation of construction professionals — and early users.

“I want to give every small contractor the same intelligence I had. Not because it is a good business — because these people deserve better. And the cities they build deserve better.” — Dr. Gabor Toldy, Founder & CEO, Callobra

The Ask

Raising the seed
that builds the platform.

$5–10M

Seed round · 18-month runway to Series A milestones. To build the multilingual production platform, acquire the first paying users across four markets, and establish partnerships with insurers and lenders who price risk on tracked project data.

Runway

18 months to Series A

Languages

EN · DE · PT · ES — day one

HQ Plan

Switzerland (Zug GmbH)

EU Operations

Budapest · Hungarian team

20%

60%

20%

Engineering Go-to-Market Operations

Month 6

180 paying accounts · ~1,100 active seats
$240K MRR run-rate
MVP live · first pilots converting

Month 12

432 paying accounts · ~2,640 active seats
$580K MRR · $6.9M ARR run-rate
First insurance partnership live · reduced premiums for verified subscribers

Month 18

720 paying accounts · ~4,400 active seats
$960K MRR · ~$11.6M ARR · Series A ready
Materials marketplace beta launched

Year 2–3

Materials commerce live
Banking partnerships active
Phase 3 addressable market

Great engineers. Right system.

The MVP is live. The pilot network exists. We're in NYC through June 5 — let's find 30 minutes.

Book 30 min → cal.eu/callobra/30min drtoldy@callobra.com

Available New York City through June 5 · 30-minute meetings welcome

Great engineers.Wrong system.