kitio.aiSift vs Rex.fit
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sift starts at See pricing page and Rex.fit starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Real-time risk scoring
- Payment fraud protection
- Account takeover defense
- Fake account detection
- Automated decision workflows
- AI agents for fraud teams
- Meal logging from photos
- WhatsApp coach
- Workout suggestions
- Nutrition tracking API
- Free meal plan
| Feature | Sift | Rex.fit |
|---|---|---|
| Best for | Machine-learning fraud prevention for payments and user accounts | AI calorie tracking from a WhatsApp chat or a wearable |
| Category | Legal, finance & HR | Legal, finance & HR |
| Pricing model | Paid | Freemium |
| Starting price | See pricing page | See pricing page |
| Free plan | No | Yes |
| Made by | Sift | Re.fit |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Sift starts at See pricing page and Rex.fit starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Sift
- Covers payments, logins and sign-ups
- Network data from many businesses
- Documented score API
- Expert services available
- No public pricing
- Demo required before buying
- Needs engineering work to send events
Rex.fit
- Logging happens inside WhatsApp
- No manual calorie entry
- API for fitness businesses
- Wearable is only available to pre-order
- Pricing not published
- Accuracy of photo estimates is unproven
Which one should you choose?
Choose Sift if you want:
- Covers payments, logins and sign-ups
- Network data from many businesses
- Documented score API
Watch out: no public pricing.
Choose Rex.fit if you want:
- Logging happens inside WhatsApp
- No manual calorie entry
- API for fitness businesses
Watch out: wearable is only available to pre-order.
Sift vs Rex.fit FAQ
What is the difference between Sift and Rex.fit?
Sift: Machine-learning fraud prevention for payments and user accounts. Rex.fit: AI calorie tracking from a WhatsApp chat or a wearable. Both are legal, finance & hr tools.
Is Sift or Rex.fit cheaper?
Sift starts at See pricing page and Rex.fit starts at See pricing page. Check both pricing pages for current plans.
Do Sift and Rex.fit have free plans?
Sift: No. Rex.fit: Yes.
Who makes Sift?
Sift is made by Sift, based in United States.
Who makes Rex.fit?
Rex.fit is made by Re.fit.
Which should I choose, Sift or Rex.fit?
Choose Sift if you value covers payments, logins and sign-ups and network data from many businesses. Choose Rex.fit if you value logging happens inside whatsapp and no manual calorie entry.