If you're looking for another Imperium alternative, CloudResearch is well worth a look. It's got a suite of tools geared for social science, market research and recruiting respondents. Its main tool, Sentry, is geared for data quality, weeding out fraudulent respondents so you can have faith your survey results are a good reflection of the population you're trying to assess.
Another good option is Pollfish. It's got a large network of more than 250 million respondents in 160 countries, and it promises fast and high-quality results with AI-generated surveys and automated quality control. Its Random Device Engagement approach and machine learning to screen out bad responses also can help you avoid bias and ensure your results are legitimate.
If you're concerned about privacy and security, BlockSurvey is designed to be private and secure, with end-to-end encryption and options like anonymous surveys and AI-generated surveys and analysis. It's geared for organizations that want to protect respondent privacy but still get useful information.
Last, SurveyMonkey is a popular survey tool that can be integrated with more than 100 other apps and that offers AI-powered insights and market research services. It's available in multiple languages and offers a variety of pricing options, making it a good choice for businesses of all sizes that need to collect and analyze data.