Does OAuth mean an email cleaner cannot read my messages?

No. OAuth lets a service request defined access without your Gmail password, but the scope may still permit broad mailbox access. Review the actual consent screen and the provider's data-use policy.

Does a privacy policy prove a tool is compliant or secure?

No. A policy describes the provider's stated practices; OAuth describes authorization; neither alone proves compliance, security, or suitability for regulated work. You need evidence that matches your requirements and current independent or contractual assurances.

How can I compare AI data processing?

Look for the specific AI provider, what fields or message content are sent, the purpose, model-training restrictions, retention, and deletion path. If the provider's own documents conflict or omit a detail you need, ask before connecting.

Compare email cleaners for privacy: what to check

To compare email cleaners for privacy, inspect the whole data path: what access the app requests, which Gmail data it reads or changes, where it is stored, how long it remains, and which cloud or AI processors receive it. OAuth is an authorization method, not proof of privacy, security, or compliance. A privacy policy is a provider's published statement, not an independent audit.

Publisher disclosure: PureBox publishes this comparison. We reviewed the official privacy, product, and Google API pages linked below on 2026-10-15. We did not audit provider systems, inspect network traffic, or obtain contractual assurances from the other providers. This is not a regulated-industry suitability review.

Compare the questions each policy answers

Service	What its current first-party material says	What remains important to verify
Gmail without a cleaner	Google documents native search, labels, and filters. See Gmail search, labels, and filters.	No separate cleaner receives mailbox access, but Google's own account, storage, and privacy terms still apply.
PureBox	Its privacy policy says the Gmail connection requests `gmail.modify` and describes processing Gmail-derived data, including snippets and some message-body content, through cloud or AI infrastructure. The subprocessor page names an AI classification processor.	The two published PureBox pages do not agree on the AI processor: the October 4, 2026 privacy policy names Microsoft Azure OpenAI Service, while the July 29, 2026 subprocessor page says OpenAI is the current classifier. Confirm the current processor, exact fields sent, retention, and model-use terms with PureBox before connecting.
SaneBox	Its privacy policy says it accesses email envelope and header data, not message bodies, and describes data deletion at cancellation alongside separate log/cache periods.	Confirm current scopes and provider-specific access; the reviewed privacy page did not clearly name a specific AI model processor. Do not infer that no such processor is used from silence on that page.
Clean Email	Its privacy policy, last updated October 9, 2026, describes access to Gmail message metadata (including attachment information) and headers to provide email-management features.	Check its current authorization screen, retention and account-deletion terms, and whether any processor handles AI or other mailbox data. Do not infer “no AI” from a policy page that does not name an AI provider.
Trimbox	Its website says email data stays on the user's device; its separate privacy policy, last updated April 15, 2026, describes personal information collected through its services.	Confirm which product and platform the on-device claim covers, what diagnostic or account information leaves the device, and whether any AI processor is involved.
Mailstrom	Its product page describes user-directed message grouping and contrasts its approach with AI algorithms; its privacy policy says data is kept as long as needed for service purposes.	Ask for current scope details, exact retention periods, and any cloud or subprocessors relevant to your account. The policy's general retention language is not a fixed deletion schedule.

This table summarizes the named first-party pages only. Policies change, different plans or providers may differ, and the absence of a disclosure from one page is not evidence that a data flow does not exist.

Check the scope and the data separately

Google's Gmail API scope documentation explains what each permission allows. OAuth means you grant a defined permission without sharing your Google password; it does not mean the app cannot read mail. PureBox's current privacy policy identifies gmail.modify. Compare that scope against Google's description and the features you intend to use, then inspect the actual Google consent screen. Do not call it metadata-only because the service requests one scope.

Next, read the provider's own account of the data it processes. Ask whether it receives message bodies, snippets, sender and subject fields, labels, attachment metadata, or derived classification results. Check whether the data is processed on-device or sent to a provider's infrastructure. An on-device claim about email contents does not automatically answer how the vendor handles account identifiers, analytics, support tickets, or diagnostics.

Check storage, retention, and AI processing

Look for separate answers to these questions:

Storage: Which records stay on the service's systems, and in which regions?
Retention: What is kept during an active account, after disconnect, after cancellation, and after deletion?
Processors: Which providers can receive data, for what purpose, and where are they listed?
AI use: Which fields are sent to which model provider? Are prompts or results used for model training? What deletion terms apply?
Human access: Can staff or support personnel view mailbox-derived data, and under what conditions?
Exit: How do you revoke Google access, delete service-side data, and inspect Gmail changes that already occurred?

Policies often describe different kinds of data under different headings. Read the privacy policy, subprocessor register, OAuth consent screen, security or data-processing pages, and product-specific help together. If one source is vague or contradictory—as the current PureBox AI-processor disclosures are—treat the issue as unresolved rather than choosing the more reassuring interpretation.

Make a decision against your actual requirements

For a personal mailbox, you may decide that Gmail's own labels are enough. If you want a third party, compare its access with the benefit you need and the amount of data you are comfortable sharing. Ask the vendor for written clarification when the processor, scope, or deletion terms are material to your decision.

Do not infer legal compliance, a certification, or suitability for health, legal, financial, or other regulated work from OAuth, encryption language, or a policy statement alone. Get the evidence and contractual terms required by your situation. Start with the broader Gmail cleanup-tool guide for product-selection criteria, then use our email-cleanup safety checklist for approval and recovery controls. PureBox's own privacy policy and security overview are separate first-party sources to read, while the disconnect guide explains what to check when access ends.

PureBox presents Inbox, Archive, and Trash suggestions and waits for your approval before applying cleanup. If you want to evaluate that workflow, begin with its published privacy policy, ask about the conflicting AI-processor disclosures, and only then decide whether to start a free sample scan.

Sources and verification

First-party Google, competitor, and PureBox pages linked above were checked on 2026-10-15. The PureBox privacy policy showed a last-updated date of October 4, 2026; its subprocessor page showed July 29, 2026. No independent technical audit was performed.