AI voice tools with a public OpenAPI spec

Figure and bar: visits/mo, estimate · year: online since

1. #10V

   Vapi

   Builds and deploys voice AI agents that handle customer support, lead qualification, and appointment scheduling calls.

   32.1k
   Active
   From $0.01 per use
2. #11A

   AssemblyAI

   Transcribes and understands speech from pre-recorded and real-time audio via APIs.

   18.7k
   Active
   From $0.21 per use
3. #12D

   Deepgram

   Converts speech to text and text to speech with real-time voice agent orchestration via unified API.

   17.6k
   Active
   From $0.00 per use
   2015
4. #17S

   Synthflow

   Builds and deploys voice AI agents that handle inbound and outbound phone calls through proprietary telephony infrastructure.

   10.9k
   Active
   Contact sales
   2023
5. #67K

   KaiCallsMCP · sign-in

   Answers forwarded business calls with a voice agent that collects caller details, handles common questions and texts the owner a summary.

   141
   Active
   From $10/mo
   2025
6. #81P

   ParseAPIMCP · sign-in

   Checks email addresses and phone numbers, resolves postal codes, and geolocates IPs, returning structured JSON responses via a single API key.

   73
   Active
   From $20/mo
7. #85P

   PusharyMCP · open

   Sends AI agent approval requests to your phone, Mac, Slack, or web app for human-in-the-loop decision making.

   50
   Active
   From $9.99/mo
   2024
8. #89S

   ScriptivoxMCP · sign-in

   Transcribes audio and video files into text, supporting 100 languages with real-time streaming and batch processing.

   46
   Active
   From $10/mo
   2024
9. #91S

   SRIFTMCP · open

   Streams files, chat and audio calls directly between browsers or AI agents over encrypted peer-to-peer links, with no server storage.

   43
   Active
10. #98Q

    QuickVoice

    Handles incoming business calls with AI agents that answer questions, capture details, and route to staff.

    27
    Active
    Pay per use
11. #103S

    SealGateMCP · sign-in

    Gateway that intercepts AI agent tool calls and data access, enforcing policy and logging each action.

    15
    Active
    From $29/mo
    2025
12. #104R

    RapportvoMCP · open

    Tracks fund commitments, capital calls and distributions, and computes TVPI and DPI for limited partner reporting.

    15
    Active
    From $29/mo
    2026
13. #123K

    Kastra

    Evaluates attribute-based policies on prompts, tool calls, and agent actions in under one millisecond, returning allow, deny, redact, or hold decisions.

    10
    Active
    From $19.99/user/mo
    2024
14. #124W

    WizebMCP · open

    Builds and runs AI agents that answer calls, qualify leads, process documents and run workflows inside existing business tools.

    10
    Active
15. #151V

    volaiMCP · sign-in

    Places and receives phone calls and SMS through one REST API and MCP server, with a Czech-speaking voice agent option.

    5
    Active
    From ≈ $23/mo
16. #159C

    CosVoiceMCP · open

    Gives an AI assistant its own phone number to place calls, book tables and take incoming calls, with written summaries.

    4
    Active
    From $29/mo
17. #200U

    unWarp

    Turns voice recordings into organized notes with a cleaned transcript, tags, a summary and action items, without a meeting bot.

    1
    Active
    From ≈ $8.99/user/mo
18. #204D

    DigitalOman.ai

    Runs AI models locally on your phone with optional cloud provider access, keeping conversations offline and private.

    1
    Maintained
    2024
19. #207W

    WhoScribe

    Transcribes audio and video files to text with speaker labels, timestamps, and subtitle exports in 90 languages.

    1
    Active
    From $5 once
20. #234U

    Usertold.aiMCP · sign-in

    Records voice interviews with users inside your product to identify friction points and usability issues.

    262 installs/mo
    Active
    From $0.15 per use
21. #322T

    TTSFree

    Converts text to speech in 24 Indian languages with adjustable emotions, pitch, and speed.

    Emerging
    Active
    From ≈ $1.05/mo
22. #325W

    WarmLane

    Answers incoming calls 24/7, qualifies callers, and books appointments to your calendar.

    Emerging
    Active
    From $39.50/mo
23. #327V

    VoxploMCP · open

    Places and answers phone calls from a REST API or MCP server, returning transcripts and extracted fields from each call.

    7 installs/mo
    Active
    From $49/mo
    2026
24. #336C

    ClearvoyanceMCP · open

    Collects anonymous voice feedback from invited or public respondents, pays them in cash or promo codes, and generates transcripts and AI summary reports.

    Little sign of use
    Active
    2025
25. #346K

    Kelam

    Gives AI assistants phone numbers to make and receive calls, reaching businesses without APIs.

    Little sign of use
    Active
26. 1

    1LookupMCP · sign-in

    Checks phone numbers against carrier and do-not-call data and verifies emails, IPs and domains through a single API.

    18.9k
    Active
    From $99/mo
    2025
27. F

    FireEdge LLCMCP · sign-in

    Places phone calls on your behalf to book appointments, chase orders, get quotes and cancel subscriptions, then reports back a summary.

    4
    Active
    From $2 per use
28. K

    Kurdish TTS, STT & Voice ChatMCP · open

    Converts Sorani, Kurmanji and Badini text to speech and transcribes Kurdish speech, with a voice chat mode.

    50
    Active
    From $12/mo
    2025
29. N

    NiceVoisMCP · open

    Trains RVC voice models from uploaded audio and converts vocals or songs with them, plus separates stems and removes noise and reverb.

    239
    Active
    From $4.99 once
30. S

    SelfPingMCP · open

    Sends an SMS to your own phone through one API call when a script, agent or app needs your attention.

    3
    Active
    From $5/mo
31. S

    SendMyCallMCP · open

    Rents virtual phone numbers in dozens of countries and routes incoming calls through call flows, voicemail and forwarding to any phone.

    89
    Active
    From $9.95/mo
    2007