Is Sierra safe with your data?
Sierra
Weak disclosure · high confidence
Sierra earns a D (39/100) because it leaves much about its data practices unstated.
#155
of 216 apps ranked
39
score · Enterprise copilot avg 48
-9
vs category average
Sierra's policy sets out detailed consumer rights, named transfer safeguards and a CCPA sensitive-data limit, but it says nothing at all about whether user inputs train models, names no retention period or security controls, and reserves the sale and sharing of personal information with advertising partners.
What Sierra's privacy policy and terms of service say about your data
Training data
The policy is entirely silent on model training. It never says whether information entered into Sierra's AI agents is used to train or improve models, and offers no opt-out, no tier distinction and no statement about who owns agent outputs.
Retention
Personal information is kept "for as long as you use our Services, or as necessary to fulfill the purpose(s) for which it was collected." No number of days, months or years appears anywhere, and there is no deletion timeline after an account closes.
Advertising and sharing
Sierra states it may "sell" or "share" personal information with data analytics providers and advertising partners for cross-context behavioral advertising. An opt-out exists through Cookie Preferences and the Global Privacy Control signal, though the stated right to use it is framed around California residents.
Security
The policy names no security controls at all: no encryption, no access controls, no certification such as SOC 2 or ISO 27001, and no breach-notification commitment or timeframe. The only named contact for privacy matters is privacy@sierra.ai.
What the policy is silent or vague on
- Not stated: keeping user inputs out of model training
- Not stated: a way to opt out of training
- Not stated: whether training use differs by plan
- Not stated: your ownership of generated outputs
Sierra privacy rating
Details
- Category
- Enterprise copilot
- Modalities
- text, audio
- Processes biometrics
- Yes
- Policy last updated
- 2026-06-17
- Region scored
- Global / US-default
- Last assessed
- 2026-10-13
Documents examined
Each grade reflects our analysis of what an app states in its public privacy policy and terms as of the assessment date. It measures the transparency of those documents, not the company's actual data practices, security, or compliance. Grades are our opinion, offered for general information. Full disclaimer.