Start with the format you ship most. If most of your spend goes to display banners, pick a tool that resizes one master design into every network size. The Brief does this and lists 25 or more ad networks. If most of your spend goes to paid social video, pick a tool where video sits in a plan you can afford. Predis includes video in its entry plan. DesignerBox starts video on the Premium plan. Next, check the credit maths. Predis rates its entry credit allowance at about 9 videos, so one week of video testing can spend the whole allowance. Last, check the API line. AdCreative.ai and The Brief both put the API in Enterprise, and DesignerBox puts it on the Ultra plan.
Compare cost in three places, and read the numbers on each vendor's own pricing page, linked under every tool below. First, what one run costs. Most tools sell credits, and a credit is not one ad. Check what a credit buys before you compare plans, and check whether the cost shows before you start a run. DesignerBox shows the credit cost of a run before you start it. Second, per image or per seat. A per seat plan grows with the team, so The Brief costs more once a pod shares the work. A per image API, such as Photoroom's, follows your volume. Third, the free tier. Pippit and Photoroom give free allowances with a watermark. The Brief and Pencil give trials. The DesignerBox free plan adds a watermark to results. Use a free tier to test before you pay. On DesignerBox, your own photo uploads start on the Pro plan.
AdCreative.ai wins because it scores each asset before you spend, and covers static and video ads in one plan. The Brief is second for sized display sets across 25 or more ad networks. DesignerBox is third, and it loses in clear ways. It is newer than Photoroom and less proven at pure cutout edge quality at high volume. Its free plan adds a watermark to results. AI video starts on the Premium plan and API access is on the Ultra plan only, so the entry plan buys neither. Buy DesignerBox for breadth in one workspace, not for API work or for catalogue-scale cutouts.