Offline appOfficial Zeyto

Interim Payment Certificate Calculator with Retention and Advance Recovery

An offline app for main contractors claiming from clients, and those certifying subcontractors.

Work out the monthly certificate in one sitting.

Interim Payment Certificate Calculator with Retention and Advance Recovery: Contract and terms screen with the example data
DeliveryInstant download
OfflineWorks offline
Real screenshot, example data

At a glance

  • FormatOffline app, opens in your browser
  • DeliveryInstant download
  • In the box2 files, 21 KB
  • Works withA current Chrome or Edge browser on a computer or phone
  • OfflineRuns offline in your browser
  • Made forUAE businesses

How it works

  1. BuyPay on Stripe’s secure page.
  2. DownloadYour order page opens at once with a secure link.
  3. Open and useUnzip it and open index.html in your browser.

See it first

Look before you pay: screenshots, a short walkthrough and a live demo you can click through.

Contract and terms, with the example data

Silent 18 second walkthrough of the real app with example data

Try it now

Click through the real app. No download, no sign-up.

Demo with fictional example data. Nothing you type is saved. Printing, export and backup are switched off in the demo; the full app has them.

What you get

  • Single-file offline app (index.html, about 51 KB)
  • Cumulative valuation with retention, cap and advance recovery
  • Printable certificate sheet and certificate register
  • Example contract plus JSON and CSV example files
  • README with the calculation rules and limits
Files and sizes (2)
  • interim-payment-certificate-calculator-offline-app.zip18 KB
  • README.txt3.3 KB

2 files, 21 KB in total. You download them from your order page after payment.

What it does not do

  • Enter retention, cap, recovery method and VAT from your contract.
  • Ask your accountant about VAT on retention.
  • Your data stays in one browser on one device: no cloud sync, so export a backup.
  • It does not know your contract.

After you buy

  • Instant downloadYour order page opens right after payment with a secure link for each file. The link is emailed to you too.
  • A fresh link any timeLinks last 48 hours. Enter your order reference and the email you paid with and we will send a new one.
  • Help is one email awayWrite to info@emeron.io with your order reference. The team answers every enquiry.
  • Fix, replace or refundIf a file is damaged, will not open, or is materially different from its listing, tell us within 7 days of the sale and we will fix it, replace it or refund you.

Find my purchasesContact the Zeyto teamMarketplace terms

Full refund wording

Digital downloads (files, templates, skill packs, guides) are delivered straight away, so they are not refunded once downloaded. If a file is damaged, will not open, or is materially different from its listing, tell us within 7 days of the sale and we will fix it, replace it or refund you.

Applies to products sold by Zeyto itself. None of this takes away rights you have under UAE law.

About this product

Interim Payment Certificate Calculator is a single-file app for contractors who certify or claim progress payments and want the arithmetic done the same way every month.

Read the full description

Interim Payment Certificate Calculator is a single-file app for contractors who certify or claim progress payments and want the arithmetic done the same way every month. You enter the contract terms once, then for each certificate the cumulative work done and materials on site to date.

What is inside:

  • Contract terms: original sum, approved variations, retention percentage and an optional cap as a percentage of the adjusted sum, advance paid and how it is recovered (pro rata or a fixed percentage), and a VAT setting
  • Certificates entered as cumulative figures, with other additions and deductions and retention released to date
  • Automatic net to date, less the previous certificate, giving the amount of this certificate, with VAT on the amount of the certificate
  • A printable certificate sheet with the build-up and signature lines, and a register of every certificate
  • A worked example and Export and Import (JSON and CSV)

Who it is for: main contractors claiming from clients, and subcontractors or consultants certifying subcontractors.

What it does not do: it does not know your contract. Retention percentage, cap, advance recovery method and VAT treatment are settings you enter from your own contract, and your accountant should confirm how VAT applies to retention and advances. It does not file anything or connect to any system.

How it differs from the Zeyto subcontractor tracker: this app calculates certificates on any contract, including a main contract, and prints a certificate. The Subcontractor Payment, Retention and Statements App tracks a ledger across several subcontractors with payments and due dates.

Tested in Chromium (Chrome and Edge engine) with scripted browser tests that compare the app's numbers with an independent calculation (about 980 numeric checks), at phone width (375 px) and desktop width (1280 px). It was not tested in Safari or Firefox, and the real print dialog was not exercised (print layout was checked as a PDF).

Zeyto also sells a separate contracting ERP. This app is standalone: it does not connect to it and nothing is imported between them.

Questions

Who is it for?
Main contractors claiming from clients, and those certifying subcontractors.
What do I need to use it?
A current Chrome or Edge browser on a computer or phone (tested in Chromium; Safari and Firefox were not tested). No internet connection, account or install needed: unzip and double-click index.html.
How do I get it?
Pay on Stripe, then download from your order page at once. Links last 48 hours: ask for a fresh one with your order reference and email.
What if the file is wrong?
If a file is damaged, will not open, or is materially different from its listing, tell us within 7 days of the sale and we will fix it, replace it or refund you. Read the terms.

Interim Payment Certificate Calculator with Retention and Advance Recovery: AED 79

Pay once, download at once.

Damaged, will not open or not as listed? Tell us within 7 days and we fix it, replace it or refund you.

Questions before you buy? Contact the Zeyto team. This is sold by Zeyto (Emeron Infospace FZE) itself, not by an independent seller. See the marketplace terms.

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