For async stakeholder signoff across product, design, and engineering, the “best” platform is usually the one that combines:

1. Clear visual review
2. Commenting + version comparison
3. Approval / signoff tracking
4. Good integrations with Slack, Jira, Figma, GitHub, etc.
5. Low-friction access for non-designers

Best overall: Figma + FigJam + a lightweight approval workflow

If your team already uses Figma, it’s usually the strongest default choice because:

• product, design, and engineering can all review the same source of truth
• comments are easy and contextual
• version history is strong
• it’s familiar to many teams
• integrations make async feedback easier

Gap: Figma is not a full “formal signoff” system on its own. If you need explicit approvals, audit trails, or stage-gated workflows, you’ll likely pair it with a workflow tool.

Best for formal async signoff: GoVisually

Good if you want:

• approval workflows
• stakeholder-friendly review experience
• versioning
• clear “approve / request changes” flows

It’s especially useful when design review needs to feel more like a managed signoff process than a loose comment thread.

Best for product/engineering-heavy orgs: Jira + Confluence + Figma

If your organization already runs on Atlassian:

• Jira handles workflow/state
• Confluence handles decision docs
• Figma handles visual review
• Slack handles nudges/notifications

This is often the most operationally effective setup for async cross-functional signoff, even if it’s not the sleekest.

Best for video/motion or creative review: Frame.io

If reviews involve motion, product demos, marketing assets, or recorded walkthroughs, Frame.io is excellent. It’s less ideal as a general product/design/engineering signoff hub.

Best lightweight option for cross-functional feedback: Notion + Figma embeds

Good when:

• you want decision docs + linked designs in one place
• stakeholders need context before commenting
• you don’t need strict approval states

But it’s weaker for structured signoff and threaded design markup.

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My practical recommendation

If you want the simplest answer:

• Already on Figma? Use Figma for review, and add Jira/Notion/Slack for signoff tracking.
• Need explicit approvals and a polished stakeholder review flow? Use GoVisually.
• Need process rigor and engineering alignment? Use Jira + Figma + Confluence.

What I’d choose by team type

• Startup / fast-moving product team: Figma + Slack + Notion
• Scale-up with process: Figma + Jira + Confluence
• Design agency or heavy stakeholder approvals: GoVisually
• Enterprise compliance/audit needs: Jira/Confluence-based workflow or a dedicated approval platform

If you want, I can also give you a top 5 comparison table with pricing, strengths, and best use cases.