What the tool should do for you
Signs you're answering on something built right
These are the things you can check from the ballot itself. InviziPoll does all of them. Any tool that claims anonymity should be able to show you the same.
The minimum group size is stated before you start
Nobody, including the person who sent the survey, sees any answer until at least the minimum group size printed on the survey have responded. That number is never below 3. While the survey is open, a few answers are always held in reserve, and the rest show in randomly chosen groups of 3 to 5 people, so when you answered doesn't decide which group you're in. When it closes, everything left shows at once, so no change to the results is ever smaller than three people and no answer is left out. The one exception is a speak-up inbox, where each report after the first group is read on its own, and the survey tells you so before you submit. Breakdowns by team or group only appear once the survey has closed, and only for groups where nobody's answers can be worked out by subtracting one group from another. A survey that never closes, like an exit or speak-up inbox, shows no breakdowns at all. If the number isn't on the page, ask for it.
You can watch the count go up by one
A response counter on the ballot lets you confirm your answer landed without anyone knowing it was yours. Proof of counting is not the same as proof of identity.
The answer is encrypted before it leaves your browser
The server only ever stores ciphertext, so there is no readable answer for an admin to open one at a time. Not a policy. A property of where the key lives.
A reply reaches you through a code, not a name
If you ask for a return code, it's made in your browser and never sent to us. It's the only way to read a reply to your comment, and it can't be traced back to you. Keep it somewhere private.
You can say what's wrong without sending your words
A comment box can offer to send just the topics you pick. Leadership sees a topic only once several people chose it. If what you type mentions a name, a date or a job title, you're offered that choice before you send. The check runs on your device and is no guarantee: it can't spot a detail only you would know.