Purchase approval software: how to choose one for a small business

In short

Choose purchase approval software with spend limits tied to user roles and statuses that only an admin can reverse. If your purchasing starts from quotes and jobs, test approvals inside your ordering system before paying for a standalone procurement suite.

A small or mid-sized business should look for three things in purchase approval software: spend limits that attach to a user role, an approval that blocks the document until someone senior signs it off, and statuses that cannot be quietly reversed afterwards. If your purchasing starts from a quote or a customer order, an approval feature inside your quoting and ordering system will usually fit better than a standalone procurement suite. If employees across departments request supplies against budgets, a dedicated tool such as Procurify, Precoro or ProcurementExpress is the more honest fit. Zigaflow belongs on the first list, and this guide says where it does not.

Start with the question of where purchases begin

Most buying software is designed around one picture: an employee asks for something, a manager approves, procurement orders, finance pays. That picture suits an office buying laptops, software seats and catalog items against departmental budgets.

Many small trade, installation, merchandise and furniture businesses buy differently. A salesperson quotes a job, the customer accepts, and the purchase orders follow because the job needs them. The spend is already attached to a customer and a margin. Approval here is not about whether anyone may request an item. It is about whether this person may commit the business to this much money, or send a quote with this much discount.

Be honest about which picture is yours before you compare a single feature list. A standalone tool will make you re-key job costs into a requisition system. An in-system approval will not give you department budgets or a request catalog.

Spend limits tied to roles beat approval chains you will never maintain

The first test is simple: can you set a limit once, on a role, and have it apply to everyone in that role? Per-person rules decay. People join, change jobs and inherit exceptions, and within a year nobody knows who can sign what.

Zigaflow's approvals work this way. Under Configure, you create a rule group for purchase orders with two thresholds: the value of any single line item and the total PO value. You attach the group to a role in Team Settings. A PO over either limit cannot be sent or downloaded until an admin user approves it from an emailed link. Quotes work the same way, with limits on discount percentage, discount value and total net value, so a role such as Junior Sales can be given a 5% discount ceiling while managers have none.

What it does not do, as described on the feature page: it does not describe department budgets, multi-step approval chains or an employee request portal. The requester picks one approver and that person decides. For a business with a handful of buyers, that is often exactly enough. For one with layered sign-off, it is not.

Statuses that cannot be quietly reversed

The second test is the one buyers skip. An approval means little if the record can be edited back into a draft afterwards. Someone raises a PO, gets approval at £2,000, then edits the lines to £6,000 and sends it.

Ask every vendor the same question: once a document is approved or completed, who can move it back? In Zigaflow you mark a status as final under Workflows and Statuses, and only an admin can move a record out of it. That applies to quotes, jobs, purchase orders and invoices. The approval request and outcome are also logged in the record's internal comments, so you can see who asked and who decided.

Also check what happens on rejection. In Zigaflow a rejected document stays blocked, with the reasons passed back to the person who raised it, so nothing leaves the business in the meantime.

What the standalone tools cost and cover

Pricing is a useful signal of the intended buyer. Precoro publishes an entry plan at $499 a month billed annually, which includes purchase requests, purchase orders, receipts, invoices, two- and three-way matching and automated approvals. Its next plan is listed at $999 a month. Procurify publishes no price: it quotes based on products, add-ons, users and integrations, and every customer starts with its Purchasing product, which includes approvals and budgets. ProcurementExpress lists four tiers with accounting integrations such as QuickBooks and Sage, and offers a 14-day free trial.

These are capable products, and if you need requisitions, budgets and matching across many requesters, the cost is justified. For a five-person business whose purchasing flows from jobs, it is a lot of procurement for the problem.

Zigaflow's published plans are Essentials at £79 a month with one user included and £69 for each additional user, Go at £199 and Momentum at £399, with a 14-day free trial. Quotes, jobs, purchase orders and invoices come in all three. That price buys the whole quote-to-invoice chain, not just approvals, so it is only a fair comparison if you would use the rest of it.

A short checklist before you sign up

• Can limits be set per role, on both line value and total value?
• Does an over-limit document actually block sending, or only warn?
• Who can reverse an approved or final record, and is it logged?
• Does it connect to your accounting software, and which one?
• Do you need budgets, requests from non-buyers or multi-level chains? If yes, shortlist standalone tools.
• Can you import your existing suppliers and products, or will you re-key them?

Run your three most recent large purchases through any trial. If the tool stops the right ones and lets the routine ones through without a message to the owner, it fits.

Sources

• Precoro pricingPrecoro · accessed 2026-11-12
• Procurify pricingProcurify · accessed 2026-11-12
• ProcurementExpress pricingProcurementExpress · accessed 2026-11-12
• Zigaflow pricingZigaflow · accessed 2026-11-12
• ApprovalsZigaflow · accessed 2026-11-12