Freedom251 › Voicemail Drop Software
Slybroadcast
What Slybroadcast is
Slybroadcast sends ringless voicemail messages to recipient voicemail systems, with stated coverage for mobile and landline phones in the United States and Canada. Users can record a message by phone or upload audio, select contact lists, and send immediately, in batches, or on a schedule. Its personalization feature uses AI and the user’s voice to add a recipient’s first name, with text-to-speech and voice-selection options. Campaign delivery reports track outreach. A purchased Callback Number enables callback reporting, call forwarding, and automated follow-up texts. Slybroadcast lists Zapier, Make, Salesforce, and Integrately for automation, and includes API access with each account; each API submission can contain up to 10,000 destination numbers. The service has Android, iOS, web, and API access, plus a mobile app for campaign sending, recording, and status checks. There is no free plan. One-time options include $12, paid once for 100 messages, while monthly plans include $8 a month for up to 100 messages and require a three-month commitment.
Who it suits
Slybroadcast may suit businesses that want to send voicemail campaigns to mobile and landline recipients in the United States or Canada. It also offers API access, integrations, and scheduled campaigns for teams automating outreach.
What it does well
- Send immediately, in batches, or on a schedule
- AI personalization can include a recipient’s first name
- API access is included with each account
- Phone and email support are listed
- One-time credits never expire
What to know first
- No free plan is available
- Monthly plans require a three-month commitment
- Monthly credits do not roll over
- Callback features require a purchased Callback Number
Limits
The 100-message monthly plan allows up to 100 messages, renews every 30 days, requires a three-month commitment, and does not roll over credits. One-time plans provide fixed message credits that never expire, while API submissions are limited to 10,000 destination numbers each.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Monthly Delivery Plan — up to 2k msgs | Automatically renewed every 30 days; three-month commitment required; credits do not roll over · Up to 2k msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $100 a month |
| Pay as You Go — 100 messages | One-time; message credits never expire · 100 msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $12, paid once |
| Pay As You Go | per package of delivered voicemails · 100 deliveries for $12 · 250 for $24 · 500 for $45 · 1,000 for $70 · 5,000 for $250 · 10,000 for $450 · unlimited campaigns, call lists and recordings · Zapier CRM integration · API · phone and email support | $12, paid once |
| Pay as You Go — 250 messages | One-time; message credits never expire · 250 msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $24, paid once |
| Monthly Delivery Plan — up to 300 msgs | Automatically renewed every 30 days; three-month commitment required; credits do not roll over · Up to 300 msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $25 a month |
| Pay as You Go — 5,000 messages | One-time; message credits never expire · 5,000 msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $250, paid once |
| Monthly Delivery Plan — up to 6k msgs | Automatically renewed every 30 days; three-month commitment required; credits do not roll over · Up to 6k msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $250 a month |
| Pay as You Go — 500 messages | One-time; message credits never expire · 500 msgs · unlimited campaigns, call lists, and audio recordings · API access · phone and email support | $45, paid once |
The first 8 of 13 plans, as slybroadcast.com lists them, read 30 Sept 2026. The maker's own page has the final word. Every plan
Getting started
- Open the Slybroadcast website
- Choose a paid monthly or one-time message plan
- Record a message by phone or upload audio
- Import or select a contact list
- Send immediately, in batches, or on a schedule
- Use the mobile app, web platform, or API for campaign management
Verdict
Slybroadcast combines voicemail campaigns, scheduling, personalization, reporting, and API access. Compare its one-time and monthly plans carefully, especially the monthly commitment and credit-expiry terms.
Questions
Is Slybroadcast free?
No. Slybroadcast has no free plan; all listed options are paid.
Which platforms does it support?
Slybroadcast lists Android, iOS, web, and API access, plus a mobile app.
Does every account include API access?
Yes. API access is included with each account, and POST submissions can use an optional webhook for call status.
What integrations are listed?
The site lists Zapier, Make, Salesforce, and Integrately for campaign automation.
Do message credits expire?
Credits on one-time plans never expire. Monthly-plan credits do not roll over.
What does a Callback Number add?
A purchased Callback Number enables callback reporting, call forwarding, and automated follow-up texts.
Facts from Slybroadcast's own pages
- AI personalization
- Voicemail Personalization can insert a recipient's first name using the sender's voice or text-to-speech. · slybroadcast.com, 15 Oct 2026
- Analytics
- Campaign delivery reports track outreach, and Callback Numbers enable callback reporting and call forwarding. · slybroadcast.com, 30 Sept 2026
- API
- API access is included free with each account; API submissions use POST and can report call status through an optional webhook URL. · slybroadcast.com, 30 Sept 2026
- API availability
- API access is included with every Slybroadcast account according to the product page. · slybroadcast.com, 15 Oct 2026
- API hosting requirement
- The API documentation requires a hosting provider with server scripting or CGI support such as ASP, PHP, Perl or JSP. · slybroadcast.com, 15 Oct 2026
- API limit
- The API documentation sets a maximum of 10,000 destination phone numbers per submission. · slybroadcast.com, 30 Sept 2026
- API status callbacks
- Developers can receive call status updates through a webhook. · slybroadcast.com, 15 Oct 2026
- API transport
- The documented API accepts HTTP POST form submissions to a MobileSphere gateway endpoint. · slybroadcast.com, 15 Oct 2026
- Callback and texting
- Callback reporting and automated follow-up texts are available with a purchased Callback Number. · slybroadcast.com, 30 Sept 2026
- Callback numbers
- A callback number can forward return calls to any chosen number and supports callback analytics. · slybroadcast.com, 15 Oct 2026
- Caller ID
- Campaigns can display a caller ID number selected by the sender. · slybroadcast.com, 15 Oct 2026
- Campaigns
- Users can record by phone or upload audio, choose uploaded contact lists, and send immediately, in batches, or on a schedule. · slybroadcast.com, 30 Sept 2026
- Company facts
- LinkedIn lists Slybroadcast as privately held, founded in 2015, headquartered in Boston and employing 11–50 people. · linkedin.com, 15 Oct 2026
- Company identity
- Slybroadcast is identified as a service of MobileSphere LLC. · slybroadcast.com, 15 Oct 2026
- Contact lists
- Campaigns can use uploaded contact lists that are managed inside the account. · slybroadcast.com, 15 Oct 2026
- Coverage
- The service says it reaches mobile and landline phones in the United States and Canada. · slybroadcast.com, 30 Sept 2026
- Data protection
- The privacy policy says contact data is stored securely and encrypted, and that customer lists are not sold or marketed. · slybroadcast.com, 15 Oct 2026
- Delivery reporting
- The dashboard provides real-time delivery reports, while callback reporting requires purchasing a callback number. · slybroadcast.com, 15 Oct 2026
- Developer documentation
- Documentation includes HTML and JSON references, a Postman collection link, example requests and transaction fields. · slybroadcast.com, 15 Oct 2026
- Follow-up texting
- A purchased callback number enables an automated text to be sent after voicemail delivery. · slybroadcast.com, 15 Oct 2026
- Founder
- Crunchbase identifies Toufic Mobarak as MobileSphere's founder, president and chief technology officer. · crunchbase.com, 15 Oct 2026
- Geographic reach
- The service says it reaches mobile phones and compatible landlines in the United States and Canada. · slybroadcast.com, 15 Oct 2026
- Headquarters
- Boston, Massachusetts, United States · slybroadcast.com, 28 Sept 2026
- Integrations
- Official pages list Zapier, Make, Salesforce and Integrately integrations for trigger-based campaign automation. · slybroadcast.com, 15 Oct 2026
Where Slybroadcast stands on Freedom251
- Voicemail Drop Software#38 of 43