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AR VR · head to head

Gravity Sketch vs Mmhmm

Gravity Sketch logo

Gravity Sketch

AR VR

VR 3D design tool

From
Free
Rated
-
Full reviewWebsite
Mmhmm logo

Mmhmm

Remote Work

Presentation platform for video calls

From
$10/month
Rated
-
Full reviewWebsite

The short version

  • Only Gravity Sketch has a free tier, so it costs nothing to try first.
  • Each has a real cost: Gravity Sketch free plan limited to 150MB cloud storage and 3 simultaneous users per room; Mmhmm renamed to Airtime and split into four separate tools, Camera, Recorder, Creator and Stacks, rather than the single app the mmhmm name refers to
  • They diverge on capability: Gravity Sketch covers VR design, Mmhmm covers Custom layouts.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Gravity Sketch and Mmhmm actually diverge.

Attributes where Gravity Sketch and Mmhmm differ
AttributeGravity SketchMmhmm
Starting priceFree$10/month
Free tierYesNo
PlatformsVR (Meta Quest, Steam, Web)Desktop Mac, Desktop Windows
CategoryAR VRRemote Work
Founded20142020

Identical on both: pricing model (freemium), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Gravity Sketch

  • VR design
  • Desktop app
  • Surface modeling
  • Collaboration
  • Import/export
  • Presentation mode
  • Rhino
  • Alias

Only in Mmhmm

  • Custom layouts
  • Screen sharing
  • Virtual backgrounds
  • Picture-in-picture
  • Recording
  • Zoom
  • Google Meet
  • Microsoft Teams

What people use each for

The jobs each tool is most often brought in to do.

Gravity Sketch

  • Spatial 3D design and conceptualisation in VRnot Mmhmm
  • Collaborative product design sessionsnot Mmhmm
  • Conceptual model generationnot Mmhmm
  • Engineering and design team collaboration in immersive environmentnot Mmhmm

Mmhmm

  • Putting a presenter on screen over slides during a video callnot Gravity Sketch
  • Recording a screen walkthrough up to an hournot Gravity Sketch
  • Adding effects and reactions to a webcam feednot Gravity Sketch
  • Collecting materials for a meeting in a shared stacknot Gravity Sketch

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Gravity Sketch

  • Free plan limited to 150MB cloud storage and 3 simultaneous users per room
  • File format support limited to OBJ and STL on free plan; other formats require paid plan
  • Evaluation tools (surface contours, viewpoints, section tool) not available on free tier
  • VR access requires Meta Quest, Steam, or web app; limited to specific platforms
  • Data localisation only available on Enterprise plan

Mmhmm

  • Renamed to Airtime and split into four separate tools, Camera, Recorder, Creator and Stacks, rather than the single app the mmhmm name refers to
  • Screen recordings are capped at one hour
  • Windows support requires Windows 10 or 11
  • Pricing is not shown on the product pages

Pricing, plan by plan

Gravity Sketch

Free
  • FreeFree
    • Core creation tools: sketching, surfacing, geometry
    • 150MB cloud storage
    • Up to 3 collaborators per room
  • Plus$undefined/mo
    • Full access to creation and evaluation tools
    • Unlimited imports/exports of all formats
    • 3GB cloud storage
  • Team$null/mo
    • 10GB cloud storage per user
    • 10+ people simultaneously in rooms
    • Organization space and user management
  • Enterprise$null/mo
    • All Team features
    • Data localization, backup, security logs
    • Dedicated account manager

Mmhmm

$10/month
  • Individual$10/month
    • Single user
    • Unlimited meetings and recordings
    • No storage or time limits
  • Individual Annual$120/year
    • Single user
    • 17% savings vs monthly billing
  • Team$10/month
    • Per-seat billing
    • Admin dashboard
    • Centralized billing
  • Team Annual$120/year
    • Per-seat billing
    • 17% savings vs monthly

Which should you pick?

Choose Gravity Sketch if

  • You need vr design.
  • You want to start without paying.
  • You work on VR (Meta Quest, Steam, Web).
  • You also want desktop app.
Gravity Sketch review

Choose Mmhmm if

  • You need custom layouts.
  • You work on Desktop Mac, Desktop Windows.
  • You also want screen sharing.
Mmhmm review

Questions people ask

Is Gravity Sketch or Mmhmm better?
Neither clearly leads. Gravity Sketch starts at Free and Mmhmm at $10/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Gravity Sketch or Mmhmm?
Gravity Sketch has a free tier; the other does not. Paid plans start at Free for Gravity Sketch and $10/month for Mmhmm.
Does Gravity Sketch or Mmhmm run on more platforms?
Gravity Sketch runs on VR (Meta Quest, Steam, Web). Mmhmm runs on Desktop Mac, Desktop Windows.
Can I use Gravity Sketch for free?
Yes. Gravity Sketch has a free tier, so you can try it without paying. Mmhmm starts at $10/month.
What is Gravity Sketch best used for?
Gravity Sketch is most often used for spatial 3d design and conceptualisation in vr, collaborative product design sessions, conceptual model generation, engineering and design team collaboration in immersive environment. Of those, spatial 3d design and conceptualisation in vr and collaborative product design sessions are not what Mmhmm is typically brought in for.
What can Gravity Sketch do that Mmhmm cannot?
Gravity Sketch covers VR design, Desktop app, Surface modeling, Collaboration. Mmhmm covers Custom layouts, Screen sharing, Virtual backgrounds, Picture-in-picture.

Answered from the vendors’ own pages

Gravity Sketch: Is there a free version of Gravity Sketch?

Yes. The Free tier includes core creation tools, sketching, surfacing, geometry, and up to 3 collaborators with 150MB cloud storage. No credit card required.

Source
Mmhmm: How much does Airtime cost?

Airtime (formerly mmhmm) costs 10 USD/month for Individual plan or 120 USD/year with annual billing providing 17% savings. Team plans also charge 10 USD per seat per month or 120 USD per seat per year.

Source
Gravity Sketch: What is the difference between Gravity Sketch free and paid tiers?

The Free tier has 150MB storage and 3 collaborators. The Plus tier has 3GB storage, 5 collaborators, and unlimited imports/exports. Team and Enterprise tiers offer 10GB+ storage per user and advanced security features.

Source
Mmhmm: Is there a free trial?

Yes, a 14-day free trial is available with full access to Creator, Camera, and Stacks. Recorder feature is limited to 5 recordings of 5 minutes each during trial. No credit card required.

Source
Gravity Sketch: What file formats does Gravity Sketch support?

Free tier exports only OBJ and USDZ formats. Plus, Team, and Enterprise tiers support unlimited imports and exports across all supported file types.

Source
Mmhmm: What are the seat limits?

Individual plan supports single user; Team plan uses per-seat billing with volume discounts available for 20+ users under Enterprise plan.

Source
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