A: Both are similar, but it would really depend on what you're wanting to set-up. These aren't all the differences, just some big ones that I noticed:

Vyper:
- Pricing tiers are a bit limited with only two tiers offered. Campaigns also can't be published live until upgrading.
- Templates are a bit limited with only 8 to choose from. We offer a library of templates for our landing pages/popups/embeds and also have an AI tool to assist with campaign creation.
- Our editor is drag and drop based with the ability to even add your own css/html blocks/scripts/branding/logos etc. Vyper's appears to be a bit more limited.
- Our advanced fraud detection is a bit more customizable: https://kickofflabs.com/features/contest-fraud-detection/
- We offer a variety of actions: https://kickofflabs.com/features/contest-actions/
- Integrations appear to be a bit limited. For example, I didn't seem any purchase tracking options.

Viral Loops:
- Tiers are limited for lead collection. You'd either have to upgrade or delete leads as your list grows. We don't limit your list/storing the leads and reset the usage back to zero every month so you can continue collecting leads.
- Our different campaign types are offered on all tier levels, while Viral Loops unlocks them at specific tiers. For example, refer a friend + reward milestone campaigns are unlocked starting at their Growing tier ($229/month).
- Full API access isn't unlocked until you hit their $399/month tier. Our is offered at Tier 3.
- No Viral Loops branding isn't unlocked until you hit their $399/month tier. Ours is unlocked at Tier 2.

I hope this helps. Please let me know if you have any questions :)