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120 free browser-based developer utilities. No sign-up required.

PayPing
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Monarch
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AI-powered subscription tracker with zombie scoring.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | devtoolstack.io | centryai.app |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Turkey · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of DeveloperToolStack yet.
CentryAI connects to your inbox, detects all active subscriptions, and gives each one a zombie score — a measure of how long you've been paying without using. Features include AI email scanning, Cancel Finder (step-by-step cancellation guide), and renewal reminders. Available on iOS and Android.
What each product offers, as listed by its team.


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


No analysis of DeveloperToolStack yet.
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DeveloperToolStack and CentryAI.app.
CentryAI.app's answer:
Launching June 30, 2026
CentryAI.app's answer:
CentryAI is the only subscription tracker with a Zombie Score — a rating that shows how long you've been paying for something you never use. Instead of just listing subscriptions, it identifies which ones are already dead and helps you cancel them in one tap with Cancel Finder.
CentryAI.app's answer:
Most trackers require you to manually add subscriptions. CentryAI scans your inbox automatically, finds subscriptions you didn't even know you had, and tells you which ones are worth keeping. It's built for people who forget to cancel — not for people who are already on top of their finances.
CentryAI.app's answer:
People who suspect they're overpaying for subscriptions but don't know exactly what they're paying for. Especially ADHD users, busy professionals, and anyone who's ever been surprised by a charge on their bank statement.
CentryAI.app's answer:
The founder has ADHD and discovered he was paying for 11 subscriptions he had completely forgotten about — totalling around $180/month. Cancelling them took 20 minutes. Building the app took six months. CentryAI exists because the problem isn't laziness, it's that subscription billing is designed to stay invisible.
CentryAI.app's answer:
Flutter (iOS & Android), Firebase (Auth, Firestore, Cloud Functions), Claude AI for email parsing, RevenueCat for subscription management.
Share your experience with using DeveloperToolStack and CentryAI.app. For example, how are they different and which one is better?
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