The best alternatives to Subbscribe are SumoMe.com, KIRIM.EMAIL, and OptinMonster. If these 3 options don't work for you, we've listed a few more alternatives below.
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SeedLegals— Close your next round faster - All your legals in one place
The only email marketing service with built-in email validation & automatic list cleaner. Stop paying for broken emails and built relationships with real people.
Kollect classifies and collects your users' messages and contact info (emails & phone numbers) from inbox and comments on your Facebook Pages. You can create custom fields, automatic replies, download or send your leads to your favorite CRM via webhooks.