In-app communication platform · Built for Saudi Arabia

Calls, chat and live location inside your app. No phone numbers shared.

Callio lets your customers, drivers and support agents talk to each other directly in your app, privately, in Arabic or English. One platform for every brand you run, with recording, reporting and contact-centre integration built in.

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iOS · Android · Flutter · React Native · Web

5,000devices connected at once in testing, zero failures

500simultaneous calls in testing, zero failures

0.45 scall setup time (95th percentile)

< 30 msmessage delivery (95th percentile)

650+automated tests passing

The problem

When a customer needs to reach a driver, courier or agent, apps either expose personal phone numbers or push people to call a hotline. Numbers get misused, calls go untracked, and the conversation leaves your app and your brand.

Callio's answer

Every call, message and shared location happens inside your app, between the right people, at the right time. Linked to the order, recorded when policy says so, and visible in your reports. Nobody ever sees a phone number.

Everything in one platform

Features

In-app voice calls

Private 1:1 calls by user or by order: the customer reaches whoever is assigned right now
3-way calls: bring a support agent into a call
Native phone screens: rings on the lock screen (iOS CallKit, Android)
Mute, hold, speaker, Bluetooth; survives Wi-Fi ↔ mobile switches
Busy handling your way: reject-as-busy or call-waiting, per company
Missed-call alert with a one-tap follow-up message
Live call-quality indicator and a quality score (MOS) on every call

Chat

1:1 and group chats (e.g. customer + driver + agent for one order)
Sent, delivered and read receipts; typing indicator
Photos, documents and voice notes
Offline delivery with push notifications
Quick replies set by the business

Location sharing

Share a pin, or live location for 15 min, 1 hour or until the order ends
Consent first; no background tracking
Shown in chat and during calls
Auto-deleted after 24 hours by default

Contact centre

"Call support" connects to in-app agents or your existing contact centre (Genesys, Avaya, Cisco, Asterisk) over SIP
Caller context arrives with the call: name, order, language, app version
Queue position and estimated wait shown to the caller
Business hours, holidays, overflow, callback requests, phone-number fallback
Escalate a chat to a call, with the transcript

Recording & transcripts

Record all, a sample, or none, per call type
Stereo recordings, encrypted with each company's own key
Speech-to-text in Arabic and English
Every playback logged with a reason; legal hold; automatic retention

Admin console & reports

Live dashboard: connected users, calls per minute, answer rate, call quality
Call records, Excel and PDF exports, scheduled email reports
Usage and billing per company, plus a BI data feed for your warehouse
Roles including Supervisor and Auditor; impersonate a user for support (logged)
Two-step sign-in, single sign-on (SAML and OIDC); Arabic and English, right-to-left

Built for many companies

One platform, many brands: each company has its own users, rules, branding and data
Quotas and fair-use protection between companies
Dedicated servers or a dedicated database for enterprise clients, no code change
Data export and full deletion when a contract ends

Developer kits

iOS (Swift), Android (Kotlin), Flutter, React Native and Web
Ready-made call and chat screens, themable to your brand
REST API, webhooks, OpenAPI reference
Free sandbox in seconds from the developer portal

Live in days, not months

How it works

1. Get a company spaceWe set up your organisation, or your developers open a free sandbox themselves.
2. Connect your backendYour server tells Callio who your users and orders are, and hands your app a short-lived token.
3. Add the SDKDrop in our ready-made screens or build your own. Calls, chat and location work immediately.
4. Manage from the consoleSet rules, branding, recording and reports. Connect your contact centre when you're ready.

Made for

Delivery & logisticsCustomer ↔ courier, without exposing numbers

Ride-hailing & mobilityRider ↔ driver, linked to the trip

Banking & fintechSecure in-app calls to verified support

HealthcarePatient ↔ clinic, recorded per policy

Retail & e-commerceOrder support in the app, in Arabic or English

Field servicesCustomer ↔ technician with live location

Measured, not promised

How much it handles: our test results

Every figure below comes from automated tests and drills we ran on the full platform: two SIP proxies, a load balancer, two media relays, two API servers and Postgres. The load figures were measured on a single 4-core laptop that was also running the load generator; dedicated servers handle more.

Capacity & speed

Test	Result	Target
Devices connected at the same time	5,000, all registered, none dropped	10,000 at launch
Simultaneous calls	500 concurrent, 1,000 calls completed, 0 failures	1,000 at launch
Call setup time	p50 347 ms · p95 449 ms · p99 757 ms	under 2 s
Smaller run (2,500 devices / 250 calls)	p95 371 ms, 0 failures	—
Message delivery time	p50 9–15 ms · p95 16–26 ms	under 500 ms
Signing in 5,000 devices	150 new devices per second, p95 1.96 s	—

Scaling beyond: API servers scale out automatically. Call signalling scales in "cells" of about 5,000 devices per 4-core server (measured). 3× peak capacity for 10,000 devices is about 9 such cells, or 6 on 8-core servers. Add cells to grow.

Reliability drills (on the live stack)

Drill	What we did	Result
Zero-downtime updates	Replaced both API servers while 12 signed-in clients sent ~7,650 requests	0 failed requests (2 runs)
Call-server restart	Restarted both SIP proxies while apps messaged every 0.5 s	Longest interruption 1.0 s; apps reconnected on their own
Autoscaling	48 clients at full load, then a trickle	2 → 4 servers in 40 s, back to 2 in 55 s, 0 of 9,407 requests failed
Media relay failure	Stopped one of the two media relays	All new calls moved to the other; full call test suite passed twice
Backup & restore	Encrypted backup, restored into a fresh database	All 29 tables and every recording restored exactly; tampered backups refused

Features tested end to end (real network calls, real media)

Feature	Result
3-way call	Three users each sent a different tone; each heard the other two, not themselves. Uninvited user refused.
Contact-centre trunk	Call reaches the PBX with caller context; PBX hears the caller (440 Hz tone verified); agent callback reaches the app
Keypad digits to the contact centre	Digits "1234" read correctly by the contact centre's menu
Call recording	Stereo recording stored encrypted, played back correctly
Sign-in security	Wrong passwords refused; forged caller identity refused; SAML attacks (signature wrapping, replay, tampering) refused
Company isolation	Cross-company calls and messages refused at the call server and the API

Automated test suites

520platform API tests

58unit tests

35call & media tests

16SAML security tests

14Android SDK tests

11React Native tests

All passing as of 27 October 2026. iOS SDK and ready-made screens type-checked for iOS and macOS; Flutter analyzer clean.

Enterprise-grade

Security & compliance

Encryption everywhere

TLS 1.3 for all connections, encrypted call audio (SRTP), and data at rest encrypted with per-company keys that can be rotated.

Built for KSA

Designed for hosting in the Kingdom. Saudi PDPL tools built in: personal-data export and erasure on request. Aligned with NCA ECC.

Controlled access

Roles, two-step sign-in, single sign-on (SAML/OIDC), IP allow-lists, and an audit log of every change and every recording played.

Privacy by design

No phone numbers shared, ever. Location only with consent and auto-deleted. Push notifications can hide names.

Observability

Live metrics, call traces for every call, alerting rules and a security event feed for your SIEM.

Always on

No single point of failure in signalling, media or API. Zero-downtime updates, automatic scaling, encrypted backups.

Why teams choose Callio

One platform, every brandCalls, chat, location, recording, reporting and contact-centre — one integration, every company you run.

Live in daysDrop-in SDKs and ready-made screens for iOS, Android, Flutter, React Native and Web.

Built for the KingdomDesigned to host in Saudi Arabia, with PDPL tools and NCA ECC alignment built in.

Proven under load5,000 devices and 500 concurrent calls in testing with zero failures, and failover drills on the live stack.

Private by designNo phone numbers shared, consent-based location, per-company encryption keys.

You stay in controlRoles, SSO, audit logs, recording policy and reports — all from one console, in Arabic or English.

Pilot partners wanted

We're onboarding a small number of delivery, mobility and service companies for pilots. Get a dedicated space, direct engineering support and launch pricing.

Become a pilot partner

See it live

A 20-minute demo: a real in-app call, chat and live location, the admin console, and how your developers integrate.

Book a demo For developers