Some teams don't want an app. They want an endpoint. Feed it an image or video, get back a verdict: compliant or not, and if not, why. That's what a SaaS API for platform spec compliance does, and for teams shipping content tooling it beats maintaining a spec spreadsheet that rots. Spreadsheets always rot. It's their nature.
When to even consider an API. You're building a scheduler, a design tool, a DAM, or an agency pipeline. You process enough assets that manual checking is fantasy. You need the check inside your workflow, not in another tab. If none of that is true, a web tool is fine and this article is not for you. No shame in that. Most people should stop reading here, and I mean that kindly.
Five things worth comparing across spec APIs. One, coverage depth: which platforms and which surfaces, and how fast new specs get added. Two, what the response actually tells you. Pass or fail is table stakes; expected dimensions, safe zones, and file limits are the useful part. Three, media handling: does it just validate or also transform? Validation-only APIs pair with your own pipeline; transform APIs replace it. Four, rate limits and pricing shape: per-call pricing punishes batch audits, flat pricing punishes light users. Five, the spec source: ask where their numbers come from and how often they refresh. An API citing a stale database is a liability with an SLA.
Five options worth comparing: a dedicated spec-compliance API, a general media-processing API with spec presets, a content repurposing SaaS pipeline with an API tier, an open-source spec list you self-host (free, and you own the freshness problem), and a platform spec compliance tool with no API that you drive manually.
The build-versus-buy math is simple. If checking specs is core to your product, build on an API. If it's a nice-to-have, a manual platform spec compliance tool plus the current video size requirements by platform from a maintained database will do. We maintain those numbers at easyimagevideo.com. And our formatting service is the no-integration option: send assets, receive compliant versions.