Currently three standard versions: Free, Pro, and Premium. - Free: Suitable for basic personal research. - Pro: 8 resource tiers, more capable AI model, monthly or yearly billing. - Premium: 8 resource tiers, strongest AI model, yearly only. - Enterprise: For customized services, please contact sales.

Yes. Free users have monthly free AI credits and daily refreshed AI credits. Basic AI capabilities can be used continuously, and the system applies lower credit consumption rules to keep core functions available long-term.

For more precise pricing, both Pro and Premium are divided into 8 tiers. Choose the tier that matches your workload with the slider. Higher tiers include more AI credits, ad-free times, and storage.

- Pro supports monthly and yearly, ideal for flexible use - Premium is yearly only, designed for long-term, high-intensity usage Annual plans include overall resource bonuses and are better for stable usage.

Annual pricing is not simply monthly x 12. Annual plans include overall discounts and resource bonuses, so value is clearly higher. Resource calculation differs from the displayed price, and users do not need to worry about the internal logic.

AI credits are deducted based on the model and task consumption. - Different models consume different credits. Basic tasks use the basic model and cost very few credits; advanced tasks use professional or expert models for specialized survey generation and cost more. - Each task is charged by actual consumption, with a minimum of 1 credit, rounded up automatically The system converts automatically; users do not need to calculate manually.

Yes. We support paid upgrades: - Same plan upgrade: You can upgrade to a higher tier at any time. The system grants the resource difference between the new and old tier; remaining resources in your account are carried over. We do not reclaim resources you have already purchased. - Cross-plan upgrade: You can upgrade from Pro to Premium. If your annual membership has been used for 6 months, the new plan resets to one year and charges based on remaining value. - Note: To ensure service quality, downgrades to lower plans or tiers are not supported.

Yes. Resources do not carry over across cycles. After expiration, unused resources will not be retained. The system will not clear historical data or auto-renew. Renewal or upgrade is up to the user. We recommend renewing or using benefits before expiration.