Stop building for the next version. With Cronofy, you get years of compatibility - not constant migrations.
Cronofy vs. Nylas
With Cronofy you partner with the team that’s been solving scheduling’s toughest challenges for over a decade. Our APIs deliver both stability and scale - supported by a 99.99% uptime SLA and technical experts on every plan.
Ready to build?
Create a free sandbox and connect up to 20 accounts, or get hands-on guidance from our expert team and build your integration alongside people who’ve seen every scheduling use case.
Efficient by design and reliable at scale
Nylas points to “higher rate limits” as proof of scale, but if your architecture forces you to make more calls just to get the basics done, it's not scaling - it's inefficiency. Cronofy was built to do more with fewer calls, cutting latency and error handling so your scheduling layer stays reliable at scale.
Our standard limits (50/sec, 500/min) comfortably support thousands of users, and already powers platforms serving millions across healthcare, recruitment, and education. If your use case needs more, we’ll work with your team to optimise your integration and extend limits where it makes sense. That’s how we deliver true scalability, and why we confidently back it with a 99.99% uptime guarantee.
Support before, during, and after the integration
When you engage with Cronofy you won’t be stuck speaking to an SDR - you’ll get help from a dedicated technical advisor who support teams building products just like yours to plan, architect, and validate your integration.
When you’re building scheduling into your product, it’s the iceberg under the surface, like edge cases, calendar inconsistencies and availability logic that shift timelines and put your roadmap behind. With Cronofy, you’ll receive full support to help you map your integration, avoid costly missteps, and accelerate time to value.
Global compliance built-in
Cronofy is built for compliance-first teams. We’re fully GDPR and HIPAA compliant, SOC 2 attested, and ISO 27001, 27701, and 27018 certified. Unlike Nylas, compliance isn’t gated or upsold - every customer gets the same protections, no matter the plan.
You also get control over data residency. As an EU-based provider with six regional data centers, we help you meet strict hosting requirements across healthcare, recruitment and education so you can serve global users with confidence.
Already using Nylas?
We’ve helped dozens of teams migrate from Nylas without the pain of forced rebuilds or downtime. Book a call with our team to assess your current setup and design the right migration path.
Is Cronofy more reliable than Nylas?
Our Sync Engine caches availability internally across all connected calendars, which means stable scheduling for your users - even when external providers hit issues. It’s why we guarantee 99.99% uptime to every customer, on every plan. Nylas' reliability depends on third-party calendar APIs like Google or Microsoft, and if those services are slow or go down, your users feel it.
Does Cronofy provide a faster booking experience for users?
Nylas’ v3 API introduced a domain-specific model, meaning availability queries are restricted to within an organisation. If you need to check calendars across different companies or domains - something that’s common across healthcare, recruitment, and education platforms - you’re stuck making multiple external API calls.
Cronofy’s approach has no such restrictions. You only need to make one API call across all domains, meaning faster performance, less load, and a noticeably better experience for your users.
How many Calendar API versions have Nylas deprecated?
Nylas has already deprecated two API versions, and v3 is now the standard. Every migration costs time, burns engineering resources, and risks breaking critical scheduling features - only to maintain the status quo.
When choosing a scheduling partner, stability isn’t optional, it’s critical. It frees up your time to invest in new capabilities instead of maintaining existing ones. Cronofy has supported our v1 API for over a decade, continuously enhancing it with backward-compatible improvements. Our users have never needed to plan for rework, rebuilds, or rushed updates.
Which solution was truly built for scheduling?
Nylas started as an email API company, with scheduling later released as an add-on. Cronofy is different, and our expert engineering team lives and breathes scheduling so you don’t have to.
Cronofy has focused exclusively on scheduling since it was founded in 2014, providing the APIs, infrastructure, and UI components product teams need to build world-class scheduling experiences and get them in the hands of your users as quickly as possible.
Build with the experts
After submitting the form, you'll receive a link to book time with a member of our technical team. In a 30 minute call, we'll walk through your specific use case, show relevant API flows and integration examples, and answer any technical or product questions you have.