kitio.aiShopify Sidekick vs Laws of Motion
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Shopify Sidekick starts at $39/mo and Laws of Motion 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
- Store data questions
- Product description writing
- Flow automation builder
- Reports and analytics
- Custom app generation
- Per-SKU size matching
- Fit quiz
- Body scan
- In-cart size reminders
| Feature | Shopify Sidekick | Laws of Motion |
|---|---|---|
| Best for | AI commerce assistant built into the Shopify admin | AI size recommendations that help apparel brands cut returns |
| Category | Legal, finance & HR | Legal, finance & HR |
| Pricing model | Free trial | Paid |
| Starting price | $39/mo | See pricing page |
| Free plan | No, 3-day trial | No |
| Made by | Shopify | Laws of Motion |
| Based in | Canada | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Shopify Sidekick starts at $39/mo and Laws of Motion starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Basic
$39/mo
- Sidekick AI assistant included
- For solo entrepreneurs
- 2% 3rd-party payment fee
Grow
$105/mo
- Everything in Basic
- Up to 5 staff accounts
- 1% 3rd-party payment fee
Advanced
$399/mo
- Everything in Grow
- Up to 15 staff accounts
- Live 3rd-party shipping rates
Plus
From $2,300/mo
- Unlimited staff accounts
- Fully customizable checkout
- 0.2% 3rd-party payment fee
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Shopify Sidekick
- Included with Shopify plans
- Uses live store data
- Reviews changes before applying
- Only works for Shopify stores
- Complex tasks still need apps
- Answers can be generic
Laws of Motion
- Matches size per product, not per brand chart
- Several ways for shoppers to give measurements
- Targets multi-size ordering
- Invite-only access
- No public pricing
- Only for apparel
Which one should you choose?
Choose Shopify Sidekick if you want:
- Included with Shopify plans
- Uses live store data
- Reviews changes before applying
Watch out: only works for shopify stores.
Choose Laws of Motion if you want:
- Matches size per product, not per brand chart
- Several ways for shoppers to give measurements
- Targets multi-size ordering
Watch out: invite-only access.
Shopify Sidekick vs Laws of Motion FAQ
What is the difference between Shopify Sidekick and Laws of Motion?
Shopify Sidekick: AI commerce assistant built into the Shopify admin. Laws of Motion: AI size recommendations that help apparel brands cut returns. Both are legal, finance & hr tools.
Is Shopify Sidekick or Laws of Motion cheaper?
Shopify Sidekick starts at $39/mo and Laws of Motion starts at See pricing page. Check both pricing pages for current plans.
Do Shopify Sidekick and Laws of Motion have free plans?
Shopify Sidekick: No, 3-day trial. Laws of Motion: No.
Who makes Shopify Sidekick?
Shopify Sidekick is made by Shopify, based in Canada.
Who makes Laws of Motion?
Laws of Motion is made by Laws of Motion.
Which should I choose, Shopify Sidekick or Laws of Motion?
Choose Shopify Sidekick if you value included with shopify plans and uses live store data. Choose Laws of Motion if you value matches size per product, not per brand chart and several ways for shoppers to give measurements.