For EPF and ESI applicability

The ESI scheme is applicable to all factories and other establishments as defined in the Act with 10 or more persons employed in such establishment and the beneficiaries’ monthly wage does not exceed Rs 21,000 are covered under the scheme. Whether the employer has employed 10 or more employees, all employees employed by the employer, agnostic of the salary are reckoned.
Not required for esi registration

More than 10 but Maximus 6500