
Invision
Balsamiq
Moqups
Axure
Flinto
Zeplin
Fluid UI
Create fully-interactive high-fidelity prototypes in minutes that look and work exactly like your app should. Sign up for a free 15-day trial and get started.

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, Proto.io seems to be a lot more popular than StackStats.app. While we know about 28 links to Proto.io, we've tracked only 1 mention of StackStats.app.
Website, pricing, platforms and company facts side by side.
|
|
|
|
|---|---|---|
| Website | proto.io | stackstats.app |
| Pricing | ||
| Company | Startup from Cyprus | Startup from the United Arab Emirates · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Proto.io yet.
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.
Proto.io Review: My Experience
More videos
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 Proto.io 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 Proto.io 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.


Proto.io is used for developing interactive web and mobile applications. It enables the production of high-quality models that closely match the finished product by designers and developers. It is also one of the best...
Proto.io is also one of the best prototyping solutions for UX designers, marketers, product managers, and anyone with an idea. This design tool uses an intuitive drag-and-drop interface to get you started immediately....
Proto.io is an online designing and prototyping tool, focused mainly on mobile applications. This tool offers an intuitive drag-and-drop editor, making it easy for designers to create prototypes. It also includes a...
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.


Proto.io Proto.io Interactive prototyping tool with a 15-day free trial. - Source: dev.to / over 1 year ago
As it will be a team project then in the beginning I suggest to define the least minimum your team is going to deliver. And then divide up the tasks on who does what. As a backup plan somebody should know how to use Figma or proto.io for... Source: over 3 years ago
A prototyping tool. Figma, proto.io or something else. Often you have to make a mock up first, for a client or for a business side, before you start working on the code. Source: over 3 years 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 / 2 days ago
When comparing Proto.io and StackStats.app, you can also consider the following products.

Prototyping and collaboration for design teams
Compare Invision to Proto.io or StackStats.app:

With Substack, anyone can start a publication that combines a personal website, blog, and email newsletter or podcast. It's quick and simple.
Compare Substack to Proto.io or StackStats.app:

Balsamiq. Rapid, effective and fun wireframing software.
Compare Balsamiq to Proto.io or StackStats.app:


The most stunning HTML5 app for creating resolution-independent SVG mockups, wireframes & interactive prototypes for your next project
Compare Moqups to Proto.io or StackStats.app:

The most powerful way to plan, prototype and hand off to developers, all without code. Download a free trial and see why professionals choose Axure RP 9.
Compare Axure to Proto.io or StackStats.app: