
Postman
Insomnia REST
RapidAPI for Mac
Bruno
Requestly
Thunder Client
HTTPie
Open source API development ecosystem

Substack
Formo.so
Advanced analytics for Substack writers. Runs 100% locally, no cloud, no subscription. Discover your superfans, churn risk, and cohort retention.

Which is more popular?
Based on our record, Hoppscotch seems to be a lot more popular than StackStats.app. While we know about 102 links to Hoppscotch, we've tracked only 1 mention of StackStats.app.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | hoppscotch.io | stackstats.app |
| Pricing | ||
| Platforms | — | |
| Company | 2019 | Startup from the United Arab Emirates · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


An open sourced free, fast and beautiful API request builder.
StackStats is a local desktop app for serious Substack writers. Import your CSV exports and get analytics Substack doesn't show you: bot-filtered open rates, cohort retention, dead subscriber detection, superfan ID, content-to-growth correlation, and an optional AI layer (supports Ollama,...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Hoppscotch - A free, fast and beautiful API request builder - Open Source Friday
No StackStats.app videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Hoppscotch and StackStats.app.
StackStats.app's answer:
I built StackStats because Substack's native analytics weren't cutting it. I wanted cohort data, real open rates (not bot-inflated), and a way to identify which posts were actually driving subscriber growth — but every tool I found was either cloud-based or required migrating off Substack entirely. So I built a local app that works with Substack's own CSV exports. No migration, no cloud, no subscription.
StackStats.app's answer:
StackStats runs 100% locally on your machine — your subscriber data never touches a server. It also goes far beyond what Substack shows natively: bot-filtered open rates, cohort retention, superfan identification, dead subscriber detection, and content-to-growth correlation. No subscription, no account, no cloud. Pay once, own it forever.
StackStats.app's answer:
Most newsletter analytics tools are cloud-based SaaS with monthly subscriptions. StackStats is a one-time purchase that runs entirely on your device. For Substack writers who care about privacy — especially those with paid subscribers — that's a meaningful difference. You also get analytics features that don't exist anywhere else, like bot-filtered open rates and cohort retention, without having to migrate away from Substack.
StackStats.app's answer:
Serious Substack writers who are frustrated by Substack's shallow native analytics and want real data to drive growth — without moving their subscriber data to the cloud.
StackStats.app's answer:
Electron (macOS + Windows), HTML/CSS/JavaScript, Chart.js, PapaParse. Optional AI layer supports Ollama, Claude, GPT-4, Gemini, Groq, and OpenRouter. Licensing via Cloudflare Workers + D1. Payments via Gumroad.
Share your experience with using Hoppscotch and StackStats.app. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Hoppscotch, formerly known as Postwoman, is a lightweight, open-source API development ecosystem that emphasizes speed and simplicity as a decent postman alternative.
Hoppscotch, previously known as Postwoman, is an open-source API request builder. This tool is highly valued by developers for its user-friendliness and versatility for handling various API requests. These include...
You can access Hoppscotch without an account. Hoppscotch has a specialized user interface for Restful, GraphQL, and Web socket connections. Using Hoppscotch’s Environment and Variable features, you can submit requests...
We have no reviews of StackStats.app yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Hoppscotch is open-source, runs in the browser, and does everything I used Postman for. Collections, environments, WebSocket testing — all there. - Source: dev.to / 8 months ago
TL;DR: For AI-native test generation from specs, try Kusho AI. For the most complete platform with the newest AI Agent Mode, go Postman. For open-source and Git-native workflows, Bruno or Hoppscotch are your best bets. Enterprise teams... - Source: dev.to / 8 months ago
Enter Hoppscotch, the open-source API development suite that’s rapidly gaining popularity. It’s a powerful, lightweight, and beautifully designed tool that challenges the way we think about API testing and collaboration. - Source: dev.to / 11 months ago
I'm working on 3 products now: 1. FormBeep(https://formbeep.com) at $38 MRR now - A form to Whatsapp tool. Stack is mainly CF workers with Clerk Auth. 2. SlashLink(https://slashlink.app) $0 - A simple pay as you go amazon link localizer.... - Source: Hacker News / 5 days ago
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