ProximaSync
Seed Stage · Offline-First Infrastructure

The internet goes down.
Work shouldn’t.

Millions of people rely on apps that assume they’re always connected — field workers, nurses, logistics teams. ProximaSync lets devices sync directly with each other when the internet isn’t there.

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The Problem

Connectivity is a privilege most apps don’t plan for.

Healthcare workers visiting patients in rural clinics. Warehouse teams three floors underground. Field inspectors crossing dead zones between cell towers. When the app stops, the work stops — and somebody is waiting on the other side of that silence.

2.6Bpeople are still offline worldwideITU Facts & Figures, 2023(opens in new tab)
$200Maverage annual cost of downtime per Global 2000 companySplunk / Oxford Economics, The Hidden Costs of Downtime(opens in new tab)
2.7Bdeskless workers — 80% of the global workforceEmergence Capital, State of Technology for the Deskless Workforce, 2020(opens in new tab)

The standard solution is “retry when online.” That’s not good enough anymore.

The Solution

Devices that talk to each other — no internet required.

  1. STEP 01

    Discover

    Devices detect each other nearby — over WiFi or Bluetooth.

  2. STEP 02

    Compare

    They exchange tiny data summaries to see what each one has.

  3. STEP 03

    Sync

    User approves the sync — only the missing data transfers.

  4. STEP 04

    Reconcile

    Server catches up later — automatic reconciliation when online.

ProximaSync is the SDK that makes this possible for any app — without rebuilding from scratch.

Why Now

The infrastructure moment is here.

Mobile is everywhere.

More people than ever depend on mobile apps for critical work — in environments where connectivity is inconsistent, unreliable, or entirely absent for long stretches of the day.

Peer-to-peer is proven.

Apple AirDrop, Android Nearby, Bluetooth mesh — the primitives exist and billions of devices already ship with them. Nobody has packaged them into a clean interface for app developers.

The SDK model works.

Stripe didn't rebuild payments for every company. Twilio didn't rebuild SMS. ProximaSync is the sync layer developers deserve — one install line, the hard problem solved.

Where We Are

Early, intentional, and building in public.

The core SDK is built and tested. We're now looking for the right early design partners — particularly in healthcare, logistics, and field operations — to validate real-world use cases. The raise will fund that design partner program and the mobile transport layer that unlocks the full vision.

Core SDK built

Platform-agnostic TypeScript core, fully tested.

LAN transport live

Real device-to-device sync over the local network.

Mobile adapters

Android (Nearby API) and iOS (MultipeerConnectivity) in progress.

We’re not trying to boil the ocean. We’re solving one hard problem extremely well.

The Opportunity

We’re raising a pre-seed round.

The capital funds three things: building the mobile transport layer that makes ProximaSync work natively on Android and iOS, finding and onboarding our first design partners to validate real-world use cases, and investing in developer evangelism so the next generation of offline-capable apps ships faster than the one before it.

The downtime problem alone is a $400B annual tax on the global economy — and it’s one we can meaningfully chip away at.

Splunk, Cost of Downtime from Global Executives(opens in new tab)Oxford Economics report(opens in new tab)

Connectivity shouldn’t be a single point of failure for the people who need these tools most.

From the Founder

I didn’t set out to build ProximaSync. I was working on something else entirely when I kept running into the same wall — my app would lose data the moment connectivity dropped. Not occasionally. Every time.

I patched it. I worked around it. And then I stopped and asked why this was still a problem in 2026. Developers shouldn’t have to solve offline sync from scratch on every project they build. The primitives exist. The hardware is there. Nobody had just… packaged it properly for the people who need it.

So I stepped away from other work to build it. Not because it was the safe move, but because I couldn’t stop thinking about it.

What I’m building isn’t for the end user directly — it’s for the developer who’s building for a nurse in a rural clinic, a technician on a factory floor, a delivery driver in a dead zone. When ProximaSync works, they never have to think about offline sync again. That’s the moment I’m building toward. That relief.

If this resonates with you, I’d love to talk.

W

Wilmarx John Cayabyab

Founder · ProximaSync

Get In Touch

Interested in ProximaSync?

Whether you’re an investor, a potential design partner, or just curious — we’d love to hear from you.

Or email me directly at wilmarx.cayabyab@gmail.com