An AI feature available on desktop may appear differently on mobile, or depend on an account setting that has nothing to do with the device. Perplexity can help locate current official guidance, but a platform comparison needs matched accounts, precise feature definitions, and dated evidence. This workflow separates documented differences from unverified interface observations.
Primary product documentation checked on 8 October 2026. The worked examples are fictional editorial examples, not claims of hands-on testing inside Gemini or Perplexity.
Define the platforms and feature
Record the product, account plan, workspace, operating system, app version, browser where relevant, and exact feature being compared. Desktop can mean a native application or a web browser; mobile can also mean an app or mobile browser. Compare those surfaces separately. A statement about an app does not necessarily establish browser behavior on the same device.
In a fictional comparison, a researcher wants to use a connected document source on a phone and laptop. The feature definition includes account connection, source selection, retrieval, and output download. These are separate operations. A platform that supports one may expose a different route for another, so the comparison should not collapse them into one vague supported label.
Collect official availability evidence
Ask Perplexity to find current vendor documentation for the exact feature and each platform. Open the pages and record checked dates and stated limitations. Follow links to plan, region, and administrator requirements where relevant. Keep release announcements separate from current usage instructions because rollout promises may not describe the present interface.
Account-management documentation can help distinguish connected-account behavior from platform behavior. For example, OpenAI publishes guidance on connecting and managing app accounts. Use the relevant current guidance as one source, then inspect feature-specific documentation. Do not infer complete mobile parity from a general account connection article.
Match the account context before testing
When authorized testing is possible, use the same account and workspace on both platforms. Confirm that the session is signed into the intended identity and that administrator controls are the same. A feature missing from a second account is not evidence of a mobile limitation. Record any setting or permission that differs before drawing conclusions.
Use a fictional sample task that requires the defined operations. Note whether each operation is visible, works, or remains untested. This article describes a research method and does not claim that a phone or desktop session was tested. If direct access is unavailable, state documented availability and leave observed behavior blank.
Classify differences carefully
Use categories such as documented platform restriction, interface route difference, account eligibility difference, configuration issue, rollout uncertainty, and unresolved discrepancy. A menu in another location is not the same as a missing capability. An error message is evidence of a failed attempt in a particular configuration, not proof that the feature never works on that platform.
For the fictional researcher, the laptop may expose a download control while the phone offers a share action. The comparison should test whether those routes produce the required file, rather than assuming the different labels mean equal functionality. Preserve screenshots or notes only when they are authorized and useful for the evidence record.
Write a dated comparison table
Give each operation a row and each tested or documented surface a column. Attach the source, configuration, evidence state, and limitation. Use clear labels: documented, observed, not tested, or unresolved. Avoid a permanent blanket claim that one platform has everything the other has when the evidence covers only a few operations.
Refresh the comparison after an app update, plan change, or revised official guidance. Keep previous observations so the reader can see whether a difference was fixed or merely investigated under a new configuration. A useful platform comparison helps someone plan a workflow and identify the exact check needed before relying on it.
Validate the evidence and hand over the result
Run the review in two passes. First, check the source records without reading the generated conclusions. Select a small but representative sample: a clear record, a contradictory record, an incomplete record, and a record that changed after the review began. Write down the expected treatment of each. This gives you a reference for judging the output instead of accepting a plausible narrative because it looks organized.
Then inspect the generated result against those expectations. Open every source supporting a consequential conclusion. Check the surrounding paragraph, the relevant table heading, and any qualifying note. A link to the correct document is only the beginning of verification. The document may support a narrower claim, describe a different version, or use a different unit. Record a correction beside the affected item rather than quietly changing its meaning.
Count the inputs and outputs where a one-to-one relationship is expected. Explain every omitted record and every merged record. When several source items become one conclusion, retain the individual references so the reviewer can reverse that grouping. When one source item produces several actions, preserve the connection so a later source correction can update all affected actions. Never interpret an empty output as evidence that there are no problems until you have checked source coverage.
Keep proposed wording separate from approved wording. An AI system can suggest how to express a finding, but the source owner still needs to confirm the underlying facts when records disagree. Use explicit states such as supported, disputed, missing evidence, and awaiting owner confirmation. Avoid a single confidence score that disguises those different reasons for uncertainty. A disputed statement with two strong sources needs a different next step from a statement with no accessible source.
Before handover, ask a colleague to use the result without your explanation. Can they locate the original evidence, identify unresolved items, and understand what changed since the last version? Fix the places where they need to guess. Save the source manifest, the prompt, the reviewed result, and the correction history together. A useful deliverable should remain understandable after the conversation that produced it has ended, and it should make the next review cheaper because the evidence trail is still intact.
Frequently asked questions
Does desktop mean the web interface?
Not always. Distinguish native desktop apps, desktop browsers, mobile apps, and mobile browsers.
Should different accounts be compared?
Match account and workspace context where possible, or clearly record the difference.
Is a missing menu proof of no support?
No. Check alternative routes, eligibility, settings, and current official guidance.
How should untested features be labeled?
Use documented but not tested, and name the relevant platform and conditions.
When should the table be updated?
After relevant app updates, account changes, or revised availability documentation.
