Substack vs TestFlight
Side-by-side comparison on App Store — Updated 2026
| Metric | Substack | TestFlight |
|---|---|---|
| Developer | Substack, Inc. | Apple |
| Rating | 4.9★ | 4.7★ |
| Reviews | 404.3K | 782.2K |
| Installs | — | — |
| Price | Free | Free |
| In-App Purchases | Yes (10 items) | No |
| Best Rank | #2 | #1 |
| Content Rating | 17+ | 12+ |
| Last Updated | 2026-03-09 | 2025-12-10 |
Substack vs TestFlight: Overview
Substack and TestFlight are both DEVELOPER_TOOLS apps available on the App Store. Substack has a 4.9-star rating from 404.3K reviews, while TestFlight has 4.7 stars from 782.2K reviews. In terms of rankings, Substack reaches #2 and TestFlight reaches #1 in the DEVELOPER_TOOLS charts. Substack offers 10 in-app purchases, while TestFlight offers no in-app purchases.
Frequently Asked Questions
Which is better, Substack or TestFlight?
Based on user ratings, Substack (4.9★) is rated higher than TestFlight (4.7★). However, the best choice depends on your specific needs.
Is Substack or TestFlight more popular?
TestFlight has more reviews (782.2K) compared to Substack (404.3K), suggesting it is more widely used.
Are Substack and TestFlight free?
Substack is free with in-app purchases. TestFlight is free. View IAP prices.
What category are Substack and TestFlight in?
Both apps are in the DEVELOPER_TOOLS category on App Store. See the full DEVELOPER_TOOLS category report.