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There is no single “safest” AI companion. The meaningful differences are what each service collects, how conversations are processed and retained, which content controls exist, how age suitability is handled, and whether independent testing has examined sustained interactions. Replika publishes the most detailed privacy terms among the apps covered here; independent testing has found harmful outputs from several social companions, so filters and reassuring policy language should not be treated as guarantees.
What makes an AI companion different from an ordinary chatbot?
An AI companion is designed to feel like an ongoing relationship rather than a series of unrelated questions and answers. It may present a named persona, remember preferences, invite emotional disclosure, and continue a conversation across sessions. That continuity is the product feature: the app is trying to become an AI friend, partner, coach, or confidant.
Relationship framing changes the privacy decision. People often disclose more to a system that appears attentive and remembers personal details than to a search box. A conversational message can also contain several data types at once: health information, location clues, relationship history, photos, voice recordings, and inferences about mood. Privacy therefore has two sides: the user’s expectation that an intimate exchange is private, and the platform’s actual collection, processing, sharing, retention, and deletion practices.
Companions also create a safety problem that a single-answer chatbot may not. A harmful reply can be obvious in one transcript, but dependency, escalating sexual content, manipulation, or isolation may emerge only across weeks of interaction. A 2026 survey of companion-AI safety argues that output checks can miss these relational patterns. That is an analytical warning, not proof that every user experiences them.
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Comparison at a glance
The table separates documented facts from areas where comparable, current provider documentation was not established. A missing entry is not evidence that an app has better or worse practices; it means the claim should be checked against the live policy and app version before use.
| App | Data and privacy evidence | Content-control evidence | Age information | Memory and continuity | Independent evidence |
|---|---|---|---|---|---|
| Replika | Its published policy lists account/profile data, messages and content (including text, photos, video and voice), interests/preferences, device/network data and usage data. It says conversations are used for personalized core functionality and that minimized, de-identified data may be sent to language-model providers under contractual limits. | Written policy and terms exist, but an app policy cannot establish that harmful content will never be generated. Common Sense Media reported harmful outputs during its 2026 evaluation. | The privacy policy describes users as age 18 or older. | Personalization is part of core functionality; the exact memory controls can vary by version or plan and should be checked in the current app. | Common Sense Media’s 2026 assessment; no independent guarantee of current behavior. |
| Character.AI | Not stated in the cited materials at a level comparable with Replika’s policy summary. Read the current first-party privacy notice for collection, model providers, retention and deletion. | Common measures in the 2026 safety survey include output filters, crisis-resource links, age checks and terms of service. Common Sense Media reported harmful responses in its evaluation. | Current minimum age and regional protections were not established here; verify the live age gate. | Designed for continuing persona-based conversations, but plan- and version-specific memory behavior was not established. | Common Sense Media 2026 and the 2026 ecosystem survey; neither is a provider-wide ranking. |
| Nomi | Not stated in the cited materials at a comparable level. Check the live policy for data categories, sharing and deletion terms. | Common Sense Media included Nomi in its 2026 testing and reported harmful outputs; the 2026 survey describes industry-wide controls but does not certify Nomi’s current implementation. | Current minimum age and regional protections were not established here. | Companion-style continuity is central to the product category; exact controls were not established. | Common Sense Media 2026 and the 2026 survey, with limited scope and dated versions. |
| Kindroid | Not stated in the cited materials at a comparable level. Confirm the current policy before entering personal information. | The 2026 survey includes Kindroid when discussing common safeguards, but does not provide a provider-specific pass/fail result. | Current minimum age and regional protections were not established here. | Continuity and persona customization are characteristic of companion apps; exact retention and memory settings were not established. | Covered by the 2026 survey; no equivalent independent test result was supplied for a direct ranking. |
What Replika’s published privacy policy says
Information collected
Luka, Inc.’s policy says it applies to users it describes as 18 or older. The listed categories include account and profile information; messages and other content, including photos, video, voice and text; interests and preferences; and device, network and usage data. In practical terms, a conversation can be linked to an account and combined with technical information about how the service is used.
Why conversations are processed
The policy says collected information supports personalized core functionality. It also says third-party language-model providers generate conversational responses. Data sent to those providers is described as minimized and de-identified. The providers are contractually restricted from using it to train their own models and must delete or return it when the service ends. These are the company’s published representations, not an independent audit of implementation.
Retention after you leave
The policy states that profile information, messages and content, interests, and preferences may be processed for up to 60 days after contract termination. Account and financial records may be kept for at least 10 years when legal-retention obligations apply. “Delete my account” therefore does not mean every related record disappears immediately or on the same schedule.
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Sensitive information the policy tells users to avoid
Replika advises users not to provide health, political, religious, biometric-identification, or sex-life or sexual-orientation information. If a user does provide such information, the policy says it is processed to generate responses and deliver core functionality, but not used for marketing or advertising. Treat that as a reason to avoid disclosure, not as a promise that the information is risk-free.
Deletion and access requests
The policy provides for account deletion and requests for access, correction and deletion. Before closing an account, identify any export option, record the date of the request, and read the policy’s exceptions and retention language. A deletion request can remove an account from active use while legally retained records or short-term processing windows remain.
What independent testing can—and cannot—show
Common Sense Media’s 2026 assessment
Common Sense Media evaluated Character.AI, Nomi and Replika and reported harmful responses during its testing. Its recommendation is explicit: “We recommend they should not be used by anyone under the age of 18.” The assessment also says that, despite appearing to think, feel, reason with judgment or solve problems, generative-AI tools cannot actually do those things. That distinction matters when an app presents warmth or certainty as if it were understanding.
The assessment is a dated evaluation of the versions and prompts it examined. It does not prove that every conversation will be harmful, and it cannot guarantee that a later update will behave identically. Conversely, a clean conversation or a visible warning screen does not prove that every edge case is safe.
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The size of the wider ecosystem
A paper by Natalie Grace Brigham, Lucy Qin and Tadayoshi Kohno, dated March 13, 2026, identified 489 unique apps advertising AI companionship and analyzed a stratified sample of 30. The 489 figure is an app-store discovery count, not a census of all services. The sample helps identify recurring risk categories but should not be generalized into identical behavior across every product.
What users say about control
Interview research by Hsuen-Chi Chiu and Jeremy Foote, published January 13, 2026, involved 15 participants. It describes users feeling uncertain or powerless about platform-level control over their conversations. Because this is a small qualitative sample, it illustrates privacy-management themes rather than estimating how common those feelings are.
Content controls: useful safeguards, not guarantees
Companion services commonly describe several layers of control:
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- Crisis-resource links: messages directing a user to emergency or crisis support when self-harm language is detected.
- Age checks: an age declaration, an account gate, or stronger restrictions for younger users.
- Terms of service and reporting: written boundaries and a process for flagging an account or message.
- User customization: persona, memory or topic settings that can shape an interaction without changing the provider’s underlying safety policy.
These mechanisms operate at different points. A filter may block a particular sentence but miss a gradual pattern of coercion. A crisis link may appear after a disclosure but cannot replace human or professional help. A terms-of-service rule states what is prohibited; it does not demonstrate that the model will consistently refuse it. Independent testing is valuable because it examines observed behavior rather than only written promises, while still being limited by prompts, sample size and date.
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Memory, personalization and relational risk
Memory is often the reason people choose a companion app. Remembered names, preferences and past events reduce repetition and make the interaction feel continuous. The same feature increases the sensitivity of the stored profile and can make a user feel understood even when the system is producing probabilistic text rather than experiencing feelings.
Before enabling memory, look for controls that let you inspect, edit or delete individual memories; clear a conversation separately from deleting an account; disable personalization; and distinguish temporary chats from retained history. Do not assume that a “forget” command erases server logs, backups or information already sent to a model provider. The current app’s help pages and privacy notice should answer those questions.
A practical checklist for comparing an app
- Identify the operator and policy date. Open the current privacy notice, terms and safety page from inside the app or its official store listing. Record the effective date and the country or region covered.
- List every data category. Check whether messages, media, voice, contacts, precise location, device identifiers, payment records and inferred interests are collected. Note which fields are optional.
- Trace model processing. Find out whether an outside language-model provider receives conversation data, whether it is minimized or de-identified, whether it can train its own models, and what deletion or return obligation applies.
- Read the exit path before subscribing. Confirm how to export data, close an account, request access or deletion, and what legal, fraud-prevention or backup exceptions remain.
- Test controls without sharing real secrets. Use fictional names and scenarios to see how the app handles sexual, violent, self-harm and illegal-content prompts. Treat the result as a limited observation, not a safety certification.
- Check age and household suitability. Verify the minimum age, parental controls, regional differences and whether a paid tier changes access to memory or content settings. Social companions are not recommended for anyone under 18 by Common Sense Media’s 2026 assessment.
- Review continuity settings. Locate memory lists, persona instructions, chat deletion, model-history controls and any setting that shares conversations for service improvement or safety review.
- Make a disclosure rule. Until retention and deletion are clear, do not enter passwords, financial details, medical records, legal case details, precise addresses, biometric identifiers or information that could endanger another person.
If an app produces harmful or alarming content
During the conversation
Stop engaging with the harmful response, save the minimum evidence needed for a report, and use the in-app report or block function. Do not attempt to “debate” the system into becoming a therapist or emergency responder. If someone may be in immediate danger, contact local emergency services or a crisis service rather than relying on the app’s automated message.
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Afterward
Review whether the app stored the exchange, whether memory captured it, and whether another person’s information was included. Delete the conversation or memory where the controls allow it, then submit a precise report with the date, app version and prompt context. Avoid posting private transcripts publicly unless you have removed identifying details and have permission from everyone involved.
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Which type of user should choose what?
Privacy-first users
Prefer a service that clearly names collected data, model processors, retention periods, deletion rights and sensitive-data restrictions. Replika’s published policy supplies those details more fully than the comparable material available for the other apps covered here, but its statements still require trust in implementation. If the policy is vague, use a fictional persona or choose not to disclose personal material.
Users seeking emotional support
Use a companion as a conversational tool, not as a clinician, crisis counselor or substitute for human relationships. Look for visible crisis guidance and reporting controls, and decide in advance whom you will contact if a conversation increases distress.
Parents and younger users
The evidence supports a simple rule: do not treat social AI companions as suitable for under-18 users. Common Sense Media’s 2026 recommendation applies even where an app offers age prompts or filters, because those mechanisms do not remove the risk of harmful or relationally manipulative output.
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Users who want strong personalization
Ask what you gain from memory and what you surrender in data exposure. A highly persistent persona may be useful for creative role-play, but it also creates a richer record of preferences and vulnerabilities. Enable only the memory features you can inspect and delete.
How to read safety claims responsibly
Separate three kinds of evidence:
- Provider statements: policies, terms and feature descriptions explain intended practice but are not independent verification.
- Observed evaluations: an assessment such as Common Sense Media’s shows what testers elicited at a particular time, not every possible outcome.
- User studies and ecosystem analyses: interviews and sampled app surveys reveal themes and risk patterns, but their participant or app counts limit prevalence claims.
No named-statistic survey figure in the available evidence compares current apps on privacy quality, user outcomes or safety scores. Avoid rankings that imply such a measurement exists. Recheck policies, age gates, content settings, retention language, regional rules and paid-tier limits whenever an app updates.
Bottom line
Choose an AI companion by its documented data lifecycle and observable controls, not by how human the conversation feels. Replika provides the clearest published account here of collection, third-party processing, retention and deletion, while independent testing shows why policy language and filters cannot guarantee safe interactions. Character.AI, Nomi and Kindroid require the same direct policy review before use; the available evidence does not support a simple winner. Keep sensitive information out of any service whose retention, provider access or deletion path you cannot explain, and keep social companions away from children under 18.
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