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Design USSD menus like flowcharts.

Drag blocks onto a canvas, test the flow in a built-in phone simulator, then deploy it to the GCMS Aggregator. No code on the USSD side.

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Works on any phoneNo internet neededTest before you ship
SIMULATOR · MTN29/125

Dial *[CODE]# and press Send.

Simulator ready
Try it: press Send to dial, then follow the Pay Bill demo. Your keyboard works too.
How it works

Design. Test. Deploy.

  1. 01DesignCreate a USSD design from a blank canvas or a starter template. Drag blocks in, fill in their messages and connect them.
  2. 02TestClick Run to open the simulator. Pick a network, phone number and shortcode, then walk every path like a subscriber.
  3. 03DeployPublish to the GCMS Aggregator, mapped to your shortcode and networks. Your live menu only changes when you deploy.
The canvas

A whole customer journey, on one screen.

A "Pay bill" service in five blocks — built in minutes.

Building blocks

Five blocks. Any USSD service.

MenuNumbered options, each leading to the next block.
InputAsk for an amount, ID, PIN or name and save it in a variable.
API CallSend collected data to your webhook, then end with a confirmation.
Send SMSEnd with an SMS — a receipt, code or link.
End SessionClose the session with a final message.
Features

Guard-rails for real USSD.

Built-in validationEmpty messages, options with no destination, bad API URLs and missing SMS text are flagged by block — before you run or deploy.
Screen-length counterEvery screen is counted against the 125-character limit, options included.
Drafts & versionsSave drafts freely. The live version only changes when you deploy.
Search & reorderJump to any block by name and drag menu options into a new order.
Design dashboardAll your USSD designs in one place — search, rename, duplicate from templates.
One design, many networksMap a design to several shortcode and network combinations.
For developers

Skip the session plumbing.

Variables carry data through the session. Use them in messages, like Hello {phone}, and in API Call bodies to send what callers type straight to your system.

BUILT-IN VARIABLEVALUE
phoneCaller's number
telcoCaller's network
product_nameMapped product name
product_codeMapped product ID
session_idCurrent session ID
API Call block → your endpoint
POST https://api.yourcompany.com/pay

{
  "meter":   "{meter_no}",
  "amount":  "{amount}",
  "phone":   "{phone}",
  "telco":   "{telco}",
  "session": "{session_id}"
}

// Then shows: "Your payment is being processed."
Custom variables come from Input blocks. Any HTTPS endpoint works.
Who it's for

Launch a USSD channel without a dev team.

Businesses & SMEsBanks, microfinance, insurance, utilities, retail and agriculture.
Agencies & integratorsBuild and manage USSD services for many clients.
DevelopersConnect flows to your backend with API calls.
Product & ops teamsChange wording or flow and redeploy — no engineering release.
Balance enquiryAirtime & dataBill paymentRegistrationSurveysCustomer supportAgent reportingSubscriptionsOrders & bookingsLoan requests
FAQ

Good questions.

Do I need to know how to code?

No. Menus are built visually. You only need code to receive data on your own server through an API Call block.

Do subscribers need a smartphone or data?

No. USSD works on any phone on the GSM network.

Can I change a live menu safely?

Yes. Edit and save as a draft — production only changes when you deploy.

How do I test?

With the built-in simulator. No real shortcode or SIM needed.

Can one menu serve several networks?

Yes. A design can be mapped to different shortcode and network combinations.

Is there a limit on screen length?

Yes, USSD screens are short. The designer counts characters for you — 125 by default.

Draw your first USSD menu.

Request access and we'll set up your account, shortcode and networks.

Request accessOpen USSD Builder Soon