FastGrowth Forms vs K: Contact Form Builder
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Oct 14, 2026 for FastGrowth Forms, Nov 7, 2026 for K: Contact Form Builder.
The short answer
- On the Shopify App Store: FastGrowth Forms 4.5 from 5 reviews and K: Contact Form Builder 5.0 from 86 reviews.
- Only FastGrowth Forms lists a free plan.
- K: Contact Form Builder lists 12 features FastGrowth Forms’s listing doesn’t mention, including Analytics, Conditional logic, Contacts.
Head to head
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 50 submissions per month limited
- · Data Viewing
- · Email Reminder
- · Unlimited forms
- · reCAPTCHA
Premium
- · All in Free +
- · Data Export
- · Free for 1000 submissions per month
- · Integrate with Klaviyo, MailChimp, Shopify
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureEasily customize forms, effortlessly manage user submissions, seamlessly integrate with Klaviyo, MailChimp, and receive instant notifications. Explore popups and inline forms with diverse field types and styles. Now, effortlessly drag and drop to create your form – perfect for subscriptions, contact form or survey form!
Effortlessly connect with your customers to generate more leads and product sales with Contact Form Builder. Easy to build Popup Contact Form, Page Embedded Forms, Signup Form, Multi Step Forms & Floating Bubble Forms. Select the fields, add contact form file upload, ensuring you gather all the information in register form or data collection form.
- Easily create forms by dragging and dropping elements.
- Flexible customization styles to match your themes.
- Integrate with Klaviyo, MailChimp, Shopify.
- Email Reminder
- Effortlessly create forms and collect data from your customers.
- Customize the app to suit your website style.
- Trigger your form anywhere.
- Lots of form templates to save your time.
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  FastGrowth Forms |  K: Contact Form Builder |
|---|---|---|
| Detected stores | Not published | Not published |
| Net store change, 28 days | 0 | 0 |
| Stores added, 28 days | Not enough data | Not enough data |
| Big-brand share | Not enough data | Not enough data |
| Top store categories | Not published | Not published |
| Top store countries | Not published | Not published |
Reviews
| Measure | FastGrowth Forms | K: Contact Form Builder |
|---|---|---|
| App Store rating | 4.5 ★ | 5.0 ★(ahead) |
| App Store reviews | 5 | 86(ahead) |
| New reviews, 28 days | 0 | 9(ahead) |
| Reviewers a year or more in | Not enough data | 0% |
Pricing
| Measure | FastGrowth Forms | K: Contact Form Builder |
|---|---|---|
| Free plan | Yes | Not listed |
| Lowest paid monthly plan | $9.90/month | No monthly plan listed |
| Longest free trial | Not listed | Not listed |
| Plans listed | 2 | Not published |
Listing
| Measure | FastGrowth Forms | K: Contact Form Builder |
|---|---|---|
| Shopify category rank | #66 | #3(ahead) |
| Shopify App Charts | Not on this week’s charts | #2 on Review surge in Forms |
| Built for Shopify | No | No |
| Launched | Jan 29, 2024 | Jul 10, 2024 |
| Languages | 1 | 1 |
| Developer | Fastlane | Kaktus |
FAQ
FastGrowth Forms and K: Contact Form Builder: common questions
- Is FastGrowth Forms or K: Contact Form Builder cheaper?
- Only FastGrowth Forms lists a free plan. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- Which has better reviews, FastGrowth Forms or K: Contact Form Builder?
- On the Shopify App Store: FastGrowth Forms 4.5 from 5 reviews and K: Contact Form Builder 5.0 from 86 reviews.
- What features does each app list that the other doesn’t?
- K: Contact Form Builder lists 12 the others don’t mention, such as Analytics, Conditional logic, Contacts, Custom. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Oct 14, 2026 for FastGrowth Forms, Nov 7, 2026 for K: Contact Form Builder; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Oct 14, 2026 for FastGrowth Forms, Nov 7, 2026 for K: Contact Form Builder. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.