Approving purchase orders from a phone removes the largest single source of delay, which is an approver who is not at a desk. It also introduces the risk that a small screen encourages a summary, and a summary encourages approval without context. Both effects are real, and the second is entirely a design choice rather than an inevitable consequence.
What the screen has to carry
The supplier, the total, the lines or at least the largest of them, the cost centre and budget position if you have it, and the reason the request was made. An approver seeing a supplier name and a number is confirming that a request exists. The reason field, in particular, is what makes an approval a judgement rather than an acknowledgement.
Make rejecting as easy as approving
Reject with a reason, query, and reassign to somebody better placed. If approving is one tap and everything else takes effort, the design has an obvious bias and the results will follow it. A reject path that requires a reason is worth more to process quality than any number of approval conveniences.
Notifications that do not get muted
An app that notifies constantly gets silenced, and a silenced app is slower than email. Batch routine notifications, escalate only what is genuinely ageing, and let approvers choose a rhythm. The measure of success is elapsed time to a decision, not how fast the first notification arrived.
Questions people ask about purchase order approval app
Should approvals be possible in bulk?
For routine low-value orders, some organisations allow it. It should never extend to anything that failed a check or exceeded a threshold.
Is a browser enough instead of an app?
Usually yes, and it avoids installation friction. What matters is that it works well on a phone, not what it is built with.
What if an approver never responds?
Escalate to a named alternative after a set period. Reminders alone produce more of the same silence.