Signed customer approval before extra work starts
Every tradie knows the awkward phone call: "can I add $X to do this?" while standing in the customer's hallway. On-Site Variations replaces that with a tokenised approval link. The tech adds a variation with title, description, and amount; the customer receives an SMS, opens the page on their phone, draws a signature on the canvas, and one-taps Approve or Decline. The audit trail captures the signature image, IP, and user-agent. Approved variations with a fixed amount automatically become invoice line items when the job is billed.
On-site, open the job and tap "Add variation"
Enter title, description, and amount (or leave amount blank for T&M)
Tap "Text customer" — they get an SMS approval link
Customer signs and approves; you keep working with sign-off in hand
Apps that work great with On-Site Variations.
About OneBookPlus apps
OneBookPlus apps aren't external integrations stitched together with Zapier or n8n — they're native modules installed inside the same platform you already use for invoicing, bookings, CRM, and accounting. That means On-Site Variations reads from and writes to the same customer records, financial entries, and calendar events as every other module, with no scheduled sync delays and no risk of data drift between systems.
Because the marketplace runs inside OneBookPlus, billing is consolidated. On-Site Variations is included free with every plan, so installation just enables the feature in your dashboard. Cancellation is one click and never reaches into your data — uninstalling an app removes the feature from the UI but preserves the underlying customer, invoice, and booking records, so reinstalling later picks up exactly where you left off.
Every app in the marketplace is built specifically for the Australian small and medium business context: GST and ABN handling are first-class concerns, dates render as DD/MM/YYYY, currency defaults to AUD, and the underlying compliance plumbing (BAS summaries, ATO-friendly records, AHPRA / NDIS / Fair Work checkpoints where relevant) is shared across modules. New Zealand businesses are supported with NZ tax and timezone defaults using the same code paths.
For a side-by-side of which features ship as core modules versus which require an installed app, see the features page. For pricing across plans and which apps are bundled at each tier, see the pricing page.
Common questions about On-Site Variations and the OneBookPlus app marketplace.
Open your OneBookPlus dashboard, go to App Marketplace, and click Install on On-Site Variations. Setup takes under 2 minutes — no separate accounts or downloads needed.
About the author
Founder & CEO, OneBookPlus
Bishal has over a decade of experience in digital marketing, web development, and small business consulting across Australia. This app sits inside the OneBookPlus marketplace, designed and maintained for Australian small to medium businesses. On-Site Variations is part of a single platform that connects invoicing, bookings, CRM, accounting, and marketing — so installing apps adds capability without adding logins.
It's free — install it in one click and start using it today.
Last reviewed and updated: May 2026 by Bishal Shrestha
Yes — this app is included free with every OneBookPlus plan.
Yes. There are no lock-in contracts on any OneBookPlus app. Uninstall from your dashboard at any time and billing stops at the end of the current period.
Yes. OneBookPlus uses bank-grade 256-bit encryption, runs on Australian-hosted infrastructure, and we never sell or share your business data with third parties.
Every app in the marketplace is built into the same platform — so On-Site Variations reads and writes the same contacts, invoices, bookings, and accounting data as the rest of OneBookPlus. No separate logins, no manual sync, no double-entry.
Yes. OneBookPlus is Australian-owned, built in Melbourne, with GST, ABN validation, ATO-ready BAS reporting, and Australian bank integrations as the foundation — not an afterthought.
© 2026 OneBookPlus. Founded by Bishal Shrestha. Made in Melbourne.