Digital Downloads PDF Flash vs Start21 Ebook Delivery
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 7, 2026 for Digital Downloads PDF Flash, Nov 6, 2026 for Start21 Ebook Delivery.
The short answer
- Both list a free plan. Paid plans start at $8.99/month for Digital Downloads PDF Flash and $9.99/month for Start21 Ebook Delivery.
- Digital Downloads PDF Flash lists 13 features Start21 Ebook Delivery’s listing doesn’t mention, including Amazon S3 storage, Analytics, Bulk upload.
Head to head
- Mexico
- United States
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Free
- · 2 GB Upload Limit
- · 50 Orders per Month
- · Automatic Email delivery
- · Customize Email templates
- · Download button on Thank you page
- · Sell files & License Keys
Starter
- · 10 GB Upload Limit
- · 1500 Orders per month
- · Add 2 Upsell Products
- · Download Page
- · PDF Passwords
- · PDF Watermarking
Plus
- · 50 GB Upload Limit
- · Early access to beta feature
- · PDF Password & Watermarking
- · PDF Streaming
- · Priority Support
- · Unlimited Bandwidth
Enterprise
- · 500 GB Upload Limit
- · Early access to beta feature
- · Priority Support from founders
- · Scale Ready & Expandable
- · Unlimited Bandwidth
- · Unlimited Orders & Products
Free
Starter
Unlimited
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureDigital Downloads PDF Flash delivers your digital products the moment an order is paid. Sell eBooks, PDFs, music, videos, templates, software and license keys. Buyers get a branded email, a download page, and a download button on the thank-you and order status pages, so files open right after checkout. Protect PDFs with watermarks, passwords and streaming. Set download limits.
Built for authors and small publishers selling direct. Attach EPUB, PDF, MOBI, AZW3, ZIP or MP3 files to any product or variant. When an order is paid, the ebook items are fulfilled automatically with a download link, so Shopify emails the buyer from your own store and shows the link on their order page.
- Sell any type of digital product – PDFs, images, videos, ZIPs, ebook and more
- Deliver an instant, seamless download experience after checkout.
- Sell under your own brand with a custom logo & social links
- Instant Auto-Delivery – Orders auto-fulfilled via email after purchase.
- Delivered at checkout: ebook items are fulfilled with a download link
- A library that never expires, with reading tips for Kindle, Apple Books and Kobo
- Made for authors: print+ebook variants, series bundles, refunds revoke access
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 |  Digital Downloads PDF Flash | |
|---|---|---|
| Detected stores | 2 | 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 | Baby & Toddler, Religious & Ceremonial | Not published |
| Top store countries | Mexico, United States | Not published |
Reviews
| Measure | Digital Downloads PDF Flash | |
|---|---|---|
| App Store rating | 5.0 ★ | Not published |
| App Store reviews | 42 | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | 0% | Not enough data |
Pricing
| Measure | Digital Downloads PDF Flash | |
|---|---|---|
| Free plan | Yes | Yes |
| Lowest paid monthly plan | $8.99/month(ahead) | $9.99/month |
| Longest free trial | 7 days | 7 days |
| Plans listed | 4 | 3 |
Listing
| Measure | Digital Downloads PDF Flash | |
|---|---|---|
| Shopify category rank | #19 | Not enough data |
| Shopify App Charts | Not on this week’s charts | Not on this week’s charts |
| Built for Shopify | Yes | No |
| Launched | Mar 4, 2025 | Nov 6, 2026 |
| Languages | 9 | 1 |
| Developer | Clockwork | Oak Glen |
FAQ
Digital Downloads PDF Flash and Start21 Ebook Delivery: common questions
- Is Digital Downloads PDF Flash or Start21 Ebook Delivery cheaper?
- Both list a free plan. Paid plans start at $8.99/month for Digital Downloads PDF Flash and $9.99/month for Start21 Ebook Delivery. Shoplist compares base prices only between monthly plans in the same currency; usage charges and annual plans vary, so check each plan’s limits.
- What features does each app list that the other doesn’t?
- Digital Downloads PDF Flash lists 13 the others don’t mention, such as Amazon S3 storage, Analytics, Bulk upload, Courses. Start21 Ebook Delivery lists 1 the others don’t mention, such as Custom download pages. 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 Nov 7, 2026 for Digital Downloads PDF Flash, Nov 6, 2026 for Start21 Ebook Delivery; 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 Nov 7, 2026 for Digital Downloads PDF Flash, Nov 6, 2026 for Start21 Ebook Delivery. 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.