Breaking this into these buckets:
1. HRIS - for lifecycle management and payroll
2. EX tools - for gauging employee experience and surveys
3. ATS - for hiring (the top HRISs have this clubbed)
4. Communication tools like Slack, Gsuite, Teams
The magic number for most HRIS/Tech stacks hovers around 400-500.
Products like Darwinbox, Peoplestrong, Success Factors, Workday only make sense when you are beyond these headcounts, both from ROI and sheer features standpoint. Any other HRIS can cater to below these numbers, and in cases, above too.
Ideally, go with a product which checks off maximum boxes against your asks.
ATS is necessary from the onset and EX depends on how much you value employee health scores.
This is my list of tools I've come across:
HRMS →
Keka, Zimyo, Freshworks, Razorpay, BambooHR
Darwinbox, SAP Success factors, Oracle Fusion, Workday
OKR →
Mesh, Peoplebox,
Profit.co, Ally, Superbeings
Engagement →
Engagewith, HuddleUp, Culturemonkey, Culture amp, Empuls
Ai driven ops tools →
Leena, Infeedo
Recruitment ATS →
Lever, Dover, Freshteam, Zoho recruit, Greenhouse, Jobvite, Workable, Smartrecruiters, Talowiz