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A powerful REST API for validating emails, IBANs, BIC/SWIFT codes, LEI, ISIN, credit cards, VAT numbers, phone numbers, and 70+ more validators. Free tier available.

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Todoist is a to-do list that helps you get organized, at work and in life.

Which is more popular?
Based on our record, Todoist seems to be more popular. It has been mentioned 134 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | isvalid.dev | todoist.com |
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| Platforms | — | |
| Company | — | Startup from Poland |
| Listed in |
In their own words, as submitted to SaaSHub.


IsValid is a validation API service for developers who need to quickly verify data formats without building their own validators. It offers 40+ endpoints covering financial identifiers (IBAN, BIC, ISIN, CUSIP), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes),...
No description of Todoist yet.
What each product offers, as listed by its team.


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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing IsValid.dev and Todoist.
IsValid.dev's answer
IsValid offers 70+ validators in a single API — covering financial identifiers (IBAN, BIC, ISIN, LEI), international standards (ISBN, ISSN), technology formats (UUID, JWT, QR codes), tax numbers (VAT, REGON, PESEL), credit cards, phone numbers, and more. No need to integrate multiple services for different data types.
IsValid.dev's answer
Most validation APIs focus on one category (email or phone). IsValid covers financial, regional, and technical formats all in one place with a consistent REST API. The free tier with 100 calls/day requires no credit card, and integration takes minutes.
IsValid.dev's answer
Developers and software teams building applications that handle user input, financial data, or international identifiers — particularly in fintech, e-commerce, and SaaS products.
IsValid.dev's answer
IsValid was built out of frustration with piecing together multiple validation libraries and services. The goal was a single, reliable API that handles the full range of data validation needs developers encounter in real-world applications.
IsValid.dev's answer
Next.js, Fastify, PostgreSQL, Docker
Share your experience with using IsValid.dev and Todoist. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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Todoist excels at organizing tasks clearly, providing intuitive categorization and easy reminders on virtually every device.
Todoist is also available on just about every platform imaginable, so no matter where you are, you can brain-dump new tasks in seconds, without interrupting your flow more than necessary. Easily sort tasks into...
For example, clicking the ‘+’ button and typing ‘Team meeting on Monday at 2 PM’. Todoist will immediately understand and set the task’s due date for Monday at 2 PM. You can also type to set the task’s reminders,...
Recommendations tracked on public social media and blogs since March 2021.


Tracking IsValid.dev since Apr 2026.
Daily task automation is a powerful tool for enhancing efficiency, productivity, and well-being. By automating repetitive tasks, individuals and businesses can save time, reduce errors, and focus on creative and strategic work. With... - Source: dev.to / over 1 year ago
Write down your daily tasks in a notebook. After completing each task, put a tick next to it. This gives you a great sense of reward like you’ve accomplished something. If there’s something you cannot work on during the day, record it in... - Source: dev.to / almost 2 years ago
Todoist: A powerful task manager that lets you organize tasks, set priorities, and collaborate with others. - Source: dev.to / about 2 years ago
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