Zeng Book vs Zoho Invoice — when each makes sense for SG firms

The quick answer

Zoho Invoice is a clean, well-priced, general-purpose invoicing tool — it works equally well for a freelance designer in London, a consultancy in Bangalore, or a F&B operator in Singapore. Zeng Book is built specifically for construction and interior design firms in Singapore, where the workflow looks different at every step.

If your invoices are flat line items billed monthly, Zoho is great. If you quote in BQ format, hold retention, issue progress claims, and need a public portal where clients can accept, Zeng Book is designed for exactly that.

What Zoho Invoice does well

We rate Zoho Invoice highly. Free tier is genuinely usable. The UI is fast. Multi-currency works out of the box. Time tracking and expenses are baked in. If you're in the Zoho ecosystem already (Books, CRM, People), the integration story is hard to beat.

It struggles with construction-specific workflows for the same reason any generic invoicing tool does — these workflows weren't in the original product design.

Side by side

Why BQ structure matters

Walk into a renovation firm in Singapore and look at any quotation the contractor sends. It's almost never a flat list. It's sectioned by trade:

• 1. Hacking & carpentry — six line items
• 2. Electrical — four line items
• 3. Plumbing — three line items
• 4. Tiling — eight line items
• 5. Painting & finishing — two line items

Each section has a subtotal. The whole quote has a grand subtotal, retention deducted, GST applied. The client signs section by section.

In Zoho, you can fake this with formatting tricks — bold labels, spacer rows. It works until you need to convert that quote into a progress claim that says "Section 3 plumbing is now 60% complete; section 4 tiling is 100%." At that point the flat line-item model breaks down and the project manager goes back to Excel.

Retention without manual line items

Singapore renovation contracts typically withhold 5–10% retention until the defects-liability period (often 12 months) ends. In Zoho, you add a negative line item to every progress claim — and forget to add it once, you've effectively given the client a 5% bonus on that claim.

Zeng Book stores the retention percentage on the quotation. Every invoice generated from that quote inherits it, and it's deducted automatically before GST is calculated. You see the retention amount on every document; you never forget to apply it because there's no manual step.

When Zoho Invoice is still the right pick

• You bill monthly retainers, hourly time, or simple flat fees — no progress claims, no retention, no BQ.
• You're already deep in the Zoho ecosystem (CRM, Books, People) and integration friction matters more to you than industry fit.
• Your clients are international and you bill in multiple currencies frequently.
• You don't handle physical site work — interior design firms that only do concept and procurement, for example.

When Zeng Book is the right pick

• You issue BQ-style quotations with multiple trade sections.
• You hold retention on contracts and need it tracked automatically.
• You issue 2–10+ progress claims per project and need cumulative-to-date totals.
• Your clients are mostly Singapore-based homeowners, MCSTs, or commercial landlords.
• You want a public link your client can click to accept or reject — without creating an account.

Bottom line

Both tools are good at what they were designed for. Zoho Invoice is a generalist that will do the job for most service businesses. Zeng Book is a specialist that fits the way Singapore construction actually runs. Pick the one whose defaults match your workflow — the time you save not fighting the tool is real money.

Try Zeng Book on your next quotation

• Sign up free and build a sectioned BQ in under five minutes.
• See all the features, including retention and progress claims.
• Compare plans — the free tier covers solo contractors comfortably.