What Excel does well
Single estimator, single job, single moment in time.
Ad-hoc calculations no software covers yet.
Quick prototyping of a new pricing model before formalising it.
Sharing a one-off cost breakdown with a client.
Slabr vs Excel
Most custom manufacturers start in Excel. Most break out of it the day they hire a second estimator, run more than ten concurrent jobs, or get burned by a wrong total. Here's an honest comparison.
Honest take
We use Excel ourselves. It's not the enemy. It's a brilliant tool that becomes a liability when the business depends on it being correct.
Single estimator, single job, single moment in time.
Ad-hoc calculations no software covers yet.
Quick prototyping of a new pricing model before formalising it.
Sharing a one-off cost breakdown with a client.
Two people quoting the same job differently — no shared logic.
Material rates updated in one file but not the others.
No live link between quote, job, production, install and finance.
Errors compound silently — formulas drift, rows break, totals lie.
No audit trail. No one knows when "the master file" changed.
Email forwarding becomes the integration layer. It fails.
Five breaking points
If two of these have already happened to you, the Excel tax is more expensive than the Slabr subscription.
Each estimator has their own habits. Pricing diverges. The one with newer files wins.
You can't see what's happening on the floor without walking there.
You phone the workshop, send WhatsApps, then call back. Three times a day. Per client.
You spend a Saturday rebuilding a margin spreadsheet from invoices and bank statements.
Their pricing logic walks out the door with them. The spreadsheet still works — until it doesn't.
Feature-by-feature
The 12 things every custom manufacturing business eventually needs.
| Capability | Excel | Slabr |
|---|---|---|
| Build a one-off quote | Yes | Yes |
| Multiple estimators with consistent pricing | No | Yes |
| Per-material wastage % rules | No | Yes |
| Quote-to-job conversion (no retyping) | No | Yes |
| Connected production stage status | No | Yes |
| Client portal for status updates | No | Yes |
| Margin actuals vs quoted on every job | Partial | Yes |
| Append-only audit trail on key actions | No | Yes |
| Connected team collaboration on the job record | Partial | Yes |
| Card payments on invoices | No | Yes |
| Automated invoice reminders | No | Yes |
| Role-based access control | No | Yes |
The Excel tax — quantified
Independent surveys (Cleo 2024, Acuity Training 2020) show finance and ops staff spend a median 4–8 hours/week on manual spreadsheet reconciliation. At a loaded admin cost of $45/hr — the US BLS OEWS 2024 median for business-operations roles — the back-of-envelope calculation against Slabr Starter at $49/month looks like this.
| Input | Value |
|---|---|
| Hours/week reconciling, fixing, retyping | 4–8 hrs |
| Loaded admin/owner cost (US median) | $45/hr |
| Annualised cost (low end) | $9,360/yr |
| Annualised cost (high end) | $18,720/yr |
| Slabr Starter — annualised | $588/yr |
| Threshold to break even | ~13 min/week |
Math: 4 hrs/wk × 52 wks × $45 = $9,360/yr (low end). 8 hrs/wk × 52 × $45 = $18,720/yr (high end). Slabr Starter at $49/mo = $588/yr. Breakeven against Slabr is roughly 13 minutes of recovered time per week, per person. Spreadsheet-error rate references EuSpRIG / Panko (2008); time-spend ranges from Acuity Training (2020) and Cleo (2024) — all linked under sources below.
When Excel is genuinely enough
If two or more of these are true, stay on Excel — Slabr would be over-engineering for where you are right now.
Solo estimator, no second person needs to price the same job.
Fewer than five concurrent jobs on the floor at any one time.
Ad-hoc work — no repeat customers, no recurring product families.
No client portal expectation; clients are happy with phone + WhatsApp updates.
Owner is the bookkeeper — accounts, quotes, invoices all in one head.
A second estimator joins and pricing logic diverges.
You're running 5+ concurrent jobs and need floor visibility.
Clients expect a self-serve portal for status and pay-by-card invoices.
You need an audit trail — who changed what, when.
You want closed-job margin actuals without a Saturday rebuild.
Common questions
When you're a solo estimator running fewer than five concurrent jobs on ad-hoc work, with no client portal expectation. We mean this — Excel is a brilliant single-user tool. The break-point is almost always the second estimator, not job count. The moment two people price the same job from different files, the Excel tax starts compounding (EuSpRIG / Panko's research finds ~88% of business spreadsheets contain at least one error; that compounds when copies diverge).
It's the unbilled hours your team spends reconciling, retyping and fixing — plus the priced-too-low jobs you only spot at closeout. Independent surveys (Acuity Training 2020, Cleo 2024) put manual spreadsheet work at 4–8+ hours per week per finance/ops person. At a $45/hr loaded cost that's $9k–$19k per year per person — orders of magnitude more than a Slabr subscription. The breakeven against Slabr Starter at $49/month is roughly 13 minutes per week of recovered time.
Yes — and we recommend it for the first 30 days. Keep Excel for one-off scratchpad pricing and any custom analysis your accountant relies on. Move quoting, jobs and floor status into Slabr. CSV import/export both ways means you don't lose anything; you just stop being dependent on the master file. Most shops fully retire production spreadsheets by month two and keep one or two analysis sheets long-term.
Anything bespoke and one-off. Custom what-if analysis, prototyping a new pricing model before formalising it, ad-hoc cost breakdowns, pivot tables for one-off questions, and quick chart sketches for an owner conversation. We use Excel ourselves for exactly those things. The shift is from "Excel runs the business" to "Excel is one of the tools we reach for when no system covers it yet".
Sources
Every quantified claim on this page maps to one of the references below. Cite-or-cut.
Sign up free, build one quote in Slabr, convert it to a job, and watch the operating loop close. If Excel still suits you, keep it.