Research: Surveys SaaS
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Crowdsignal.com was PollDaddy before (changed on nov 2018), and it is an Autommattic Company (Wordpress). Free plan is only one user but unlimited polls and surveys.
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LimeSurvey is open source, quite good actually, written in PHP and easily self-hosted, even as SaaS.
- Interesting template shop and tutorials are here
- Responster seemed like it has a generous free plan until I realized that they don’t support NPS questions which are the ones we mostly need.